Another benefit to diversity (when using linearly polarised antennas) is that you can set the receiver antennas to different orientations (90 degrees apart) so as to significantly reduce the up to 20dB loss associated with the transmitter antenna being 90 degrees out of plane with the receiver antenna. Pretty handy if your transmitter is mobile and changes orientation regularly.
That completely disagrees with recommendations for Wi-Fi radios capable of spatial diversity. The antennas may be angled relative to the housing, but as a pair they should be parallel to each other.
Hi Dave ! love your videos. I used to work for a car radio manufacturer in the late 80s . They devoloped a didiversity receiver for the FM broadcast band. It could mix up to 4 atennas. The atennas were not switched, instead it fase shifted the intermediat frequency stage and summed up the signals and then to the demodulator. The net effect was sinthezising a directive atenna sensitivity pattern to maximise the best signal quality and reject intefering signal paths. All done in analog domain !!
According to a 2019 interview with the two Sennheiser brothers, they maintain a presence at the US west coast to have a direct connection for the movie industry, and the east coast for the music industry. Also having a production facility in the country (Albuquerque) probably just makes sense.
Dual IFs and dual mixers mean it is a double conversion receiver. The IFs are 241 and 10.7 MHz. Only the first LO is tunable. The service manual for a similar product, the OM100, is on elektrotanya.
Not a Faraday cage, more like a massive large multimode waveguide. Complete with random absorbers and filters all throughout the volume, so that you can get a point that is 30cm away from another, yet have 60dB of signal strength difference between them.
I love all the insight given with these teardowns. I learn so much about different design implementation methods that are otherwise difficult to discover. Even just a small comment in passing about something like the ground stitching vias can lead me on to learn about a whole new facet that I hadn't considered. Thanks Dave!
You learn so many things just by Dave's commentary on the process. Like how the input is ran under the board so that any imperfections in the metal shield won't hurt it. You'd never know this unless you had to design one of these type of circuits.
Sennheiser evolution user here (for decades!) Great units for both their wireless lav kits, XLR mic plugs (as seen on ISS / NASA all the time) - and I can confirm the receiver base stations are better than the small camera receiver units which can flutter a bit at times at distance. But on the whole, 10 hours battery life... super durable casing and connectors... easy to configure... can custom name on the displays for ID, etc. Staple of the news and video production industry! I glad to hear the Dave tick of approval on them.
live sound engineer here, this is the answer. Company I work for has about 4 cases, each with 8 of these receivers and 2 combiners at the top. Larger gigs that require all 32 of the receivers will use another case that has another combiner to bring all 32 receivers into a single pair of antennas that will typically be placed stage left to front of house. Occasionally we'll use 1 antenna stage left, the other stage right, but we try to avoid this due to theoretical impedance mismatches with different cable lengths.
@@ceilingfanmusic6597 The receiver only draws 4 watts peak, so that diode is plenty big. And presumably both antenna connections would be feeding power, so the current in each of those diodes would be cut in half.
@@strehlow maby true but look at the components for the dc input compared to the phantom power in for the receiver. I'm sure it works but they just looked small to me lol
@@ceilingfanmusic6597 Without tracing everything, it isn't clear if the main power components are even used if phantom is there. Meaning does the phantom feed the inputs of the regulators, or replace them? Clearly it works, but I can't explain exactly why without studying it further.
The is actually rack mountable, it just doesn't have the hardware attached. The same case style is also used for the 1:4 aerial amplifier/splitter (which can also provide power over the bnc to the receivers), which might explain the extra mounting points.
@@colejohnson66 yep, a 19" rack. They're designed to fit side by side, so you can get two receivers per 1U. In fact, now that I think about it, those extra mounting holes will be for the plate that is used to connect the two receivers together.
@22:00 Those diodes on the antenna inputs will be input protection to shunt excess input voltage to ground to prevent overloading of the front end, that is a common technique to prevent front end overload.
Doubtful. Were that the case, one end of each diode would be taken to ground as immediately as possible, and there would be no earthly reason (sorry) to run a long trace to connect the cathodes of the diodes together. Also, the ferrite beads would hurt the surge suppression capability. A quick scan of the user's manual shows that the ASA 214 antenna splitter is in fact capable of powering receivers via the RF input jack, so this appears to be the purpose of these circuits, and it explains the orientation of the diodes. The two ferrite beads and the the cap to ground help prevent noise on the system power rail getting into the RF input. In less time than Dave spends in frenetic speculation he could have done a few simple continuity checks to see where the cathodes of the diodes connect into the system. Seems likely they go to the input side of a regulator. Were they connected straight to the supply rail, there would be no reason to connect them together with an isolated trace rather than dropping each one directly to an internal plane. Speaking of diodes, perhaps more interesting are the two groups of three diodes on each of the input filters. Notice that they are in parallel within each group, and the anodes are grounded. There is a resistor connected to the cathodes, and that node also connects to a pair of paralleled capacitors that form part of the filter circuit. Unless there is a negative supply in the system, the diodes will always be either unbiased or reverse-biased. This, and the fact that there are 3 in parallel, suggests that they are varactor diodes used for tuning the filter, probably under processor control. Presumably, the three in parallel are needed to get more capacitance. Were they, say, PIN diodes for band switching, the orientation would be opposite and it seems unlikely that three would be necessary.
This is a lot more complicated than I would have expected! Halfway through the video I forgot what we were being shown and could've sworn it was a bit of test kit rather than just a wireless audio interface.
You didn’t mention Rayleigh fading - although you did kind of describe it. The effect of the multi path is to cause a deep fade / cancellation every half wavelength you move. Polarisation diversity antennas are often used in mobile phone systems to avoid too much clutter on rooftop sites - another way to achieve diversity without two physically separate antennas.
I think the little camera receiver has diversity too. The second antenna needed for that ist actually the ground wire in the microphone cable. Oops, you put that in the video, sorry. :-)
It's not a Faraday cage Dave, it's a giant capacitor, if you full charged it then shorted it out through a DeLorean it would generate 1.21 gigawatts of power
Nice video! It seems to have overlooked one small but nice hardware feature of the EW100 G3: just left of the display, there is an infrared (IR) interface. Why? Quite clever: the wireless microphones / belt pack transmitters have such an interface as well. When held less than 10cm apart, the user can synchronise the programmed frequency and the user programmable mic name (“Vocals Peter”). Quite handy! Setting frequencies on these small microphone transmitters is not trivial, especially when you have multiple mikes and are working under pressure such as in live sound. The presence of this IR interface makes you wonder how 'standard' the display assembly is... Talking multiple mics, some have already commented on the fact that the EW100 supports DC powering related to its two antenna inputs. Actually, if you look well at the labelling on the back panel in the video, you can already see it’s DC power into the device (from antenna to device), and not from device to (active) antenna. Why does this feature make sense? Audio engineers often use multiple wireless mics/bodypacks, so also have multiple receiver units. Also, they often have their receivers at the back of the venue (‘Front of House’), with the microphones on stage, and then want to use well placed, directional antennas. For such users, Sennheiser was selling ASA 1 Antenna Splitter alongside the EW100 G3 series (now replaced by the ASA 214 which supports G3 and G4 units). It not only allows you to connect a set of good active or passive antennas to up to four receivers (or 8 using two splitters), but, using the DC powering feature, also power all these receivers. This not only makes the setup cleaners, but also more reliable. (Not irrelevant, I had a EW100 PSU failing myself, too bad that these expensive devices seem to come with not-so-good quality power adapters…) Kind of in the opposite direction, for in-ear monitoring (IEM), Sennheiser has a similar system on the market: with an AC 41 antenna combiner, up to four (1/2) rack-mount *transmitters* can share a single antenna while the combiner also powers all these transmitters.
I'm guessing wireless mic systems are just sold more frequently in the US, the ones for the European market are also assembled in the US. (parts mostly made in China.)
Sennheiser ...... Ah now there is a name you can TRUST. I bought my twin daughters bottom of the range Sennheiser headphones ... like 5 years ago or something when my kids were 10, they cost like $15-20, but even my daughters could immediately tell the sound quality difference from all the BULLSHIT Dre Beats, and other "fashion" phones all their m8s had. And both sets are still working .... take away QUALITY does not always require a phat and open wallet :P
Great content Dave! Stuff like this is what got my in to your channel. I love receivers but would also like the see more trans content on your channel. It’s 2021 dude
Maybe somebody else already mentioned this, but... Sennheiser rack mount receiver (this one is rack mount receiver, it only need rack mount kit, mechanical steel stuff) have option to get DC power via RF BNC. Imagine setup with 8 receivers. Each receiver need 2 antennas and wall PSU, total 16 antennas + 16 coax cables + 8 PSUs. Now you need to put all these 16 antennas on stage or in TV studio and connect 8 wall PSUs in your rack. WHAT A CABLE MESS! In these situation Sennheiser can sell you additional device called antenna distributor. Antenna distributor have ~20 BNC connectors on back and IEC12 power inlet. 2 BNCs for incoming antenna coax from stage, 16 BNC OUTs to receivers, 2 BNCs for linking (don't ask why, I don't remember why there are LINK BNCs). Antenna distributor split (and ampilfy a little bit) incoming RF signal from antenna and sent to every receiver, but... antenna distributor also deliver DC power to every receiver on the same BNC. So, now you only need one 230V AC power cord for every 8 receivers + distributor. Nice and clean cable management! As bonus antenna distributor also deliver (receiver is not delivering) DC via BNC to antenna input specially for optional antenna 10 dB(?) RF amplifier.
I have some dB technologies wireless systems where the RF cans are actually branded, something that you think might look a bit chintzy but actually it looks really smart, also it's wise to not their cost cutting in that the posher reciever with an LCD display and metal case actually uses the plastic case (rear and bottom) and mainboard from the cheaper reciever. You need to acquire some older wireless systems now to teardown, the old TOA systems with the silver/gold/satin receivers are available quite cheaply and seem built very well, including using a built in PSU. Also noting that despite their age (released in the early 80's, I've seen adverts from 1985) they use AAA batteries (x3) and as such you still get 5hrs of battery left with the battery low LED lit, some 9V systems don't last much longer on a full battery, total rated battery life is quoted as 30hrs and I for one believe them.
These days when I bring home a new gadget I open it up to see the quality of construction etc. and take photos in case I want to refer to them in the future.
22:05 - correct, you can get an antenna distributor that will power this unit over the BNC cables - see Sennheiser ASA 214. now a question for you.. i have Sennheiser IEM transmitters which are powered from an antenna combiner over the BNC cables. i also have a Shure PSM300 antenna combiner, which isn't powered over BNC. will plugging the powered combiner into the PSM300 damage the latter?
Qorvo has been around quite a while. In Wi-Fi they tend to make the higher quality. mid-scale hardware. There products would not be used in cheap, low cost products that are meant to be sold at the cheapest price.
Hi Dave, I guess it's usual company politics. Much european companies do produce and deliver from USA to "APAC" (i. e. "Asia and Pacific") market from USA for (delivery-/ energy-) price and tax reasons. The only difference inbetween european market models and other countries is just the RF module setting, sometimes the RF module itself. Maybe some internationalization thingy for the user interface. All other hardware parts are the same. This is why the german company "Sennheiser" does development in germany but produces foreign country versions outside europe.
I'd love an Evolutionm Wireless setup for home, they sound great, i've been using the me-3 head mic for years for voice recognition, solid as heck and sound amazing for the money.
I think modern diversity receivers do some maths (I know, nasty business) with both received signals to get a better signal than any of the original ones.
In the 60s I used diversity receivers at a NASA satellite tracking station. They combined the two signals according to their signal strengths. All analog in those days.
Ah, Gary. Poor obsolete Gary. New daddy Qorvo promptly disowns him. I wonder who Gary's replacement will be? Who will be Qorvo's new favorite downconverter?
So Dave, a serious question. Multiple news outlets in the US are showing pictures of supermarkets with empty shelves in Australia. Is it really that bad in parts of your country ?
?!! First I've heard of that. Not sure about Dave's suburb, but I can assure you it's not even been a news story down south for the most part. I think some of the small regional places are struggling with some product lines because they've blocked the roads to avoid cases. But in the cities it's mostly fine. I went shopping tonight and it was business as usual. Roast Lamb on special, grabbed a bunch of fresh vegies too. The only issues in the cities where most of the population lives has been in a few suburbs because if there is a single detected Covid case that has visited the Supermarket (masked member of the public)... the whole supermarket staff has to test and stay home until results come back. So it means there's no staff / supermarkets have to scramble new staff together for that store - which has taken some logistics but they are pretty good at it now. But rest assured, there's tons of food within easy logistical reach - even if it's not on shelves sometimes. The biggest 2 cities are in "stay-at-home-where-possible" mode at the moment, with some suburbs in "stay-home" enforcement mode due to case clusters. We're all waiting for vax's to hit "80%" so they can start relaxing rules a bit - and it looks like we're on track for that by late October in worst effected areas. Although in truth, the "80%" is stupid metric because it doesn't include kids under 16. Singapore is a few months ahead of us with 80% of full population of all ages vaxd and currently saying they think the number needs to be more like 90% for a safe reopening. So that'll ultimately take us into next year. But y'know - we'll probably be allowed to travel over Christmas as most Australians will lose the plot if they can't have a beer and a BBQ with the family on Christmas day!! So in short, yes, there's probably a few small places (like less than 0.1% of population) where they have interrupted supply lines, but for the most part, there's food, tons of alcohol, coffee, click-and-collect, a slightly slower postal service and a bunch of slightly "over it" Aussie's counting down the days until Christmas holidays. Hope you're doing ok where ever you are from!!
Can the processor mix both channels and adjust for phase differences? Or does it just switch to the strongest? Also is it good practice to point antenna in different axis? My wifi card has 3 antenna and I point each in a different axis. No idea if I should!
can u turn off "zoom" OSD for microscope? u tend to include a lot of text annotations, so i found my eyes jumping to the corner expecting something interesting upon every zoom lol.
If I can try to summarize it... RF is the frequency high enough to propagate efficiently from the antenna, but at the receiving end it gets converted to a lower one (hence _intermediate_ frequency) which is easier to work with. If all the circuit worked on the higher frequency the values of components and PCB layout would both be impractical. Therefore, that RF is brought down to an IF to process it.
ah the fpv Quadcopter recievers use a similar system with two rx5808 5.8ghz reciever modules and then use a cd4066 for the switching of the recievers, well not the signal but they switch between the composite video out
I had an A/V input selector that used 4066s and I noticed that the colors would change slightly when going through it. The blue screen of a VCR with no tape (yeah it was that long ago) looked a lighter, more grayish blue. So if your image looks a little washed out, try looking at the video signal before the switch.
@@gabotron94i didn't know that but for my application its suitability since Quadcopters are moving at very high speed and the noise in the video from the wireless transmission makes it something negligible, still i will see how much of a difference it makes
it being made in Germany but assembled in the US is a tactic/loophole so that they can possibly slap a "Made in USA" or some sort of related USA designation sticker or print on the packaging and appeal to those who like to buy "US made" products, because the politicians or agency (FTC) that made the rules for products that can use the "Made in USA" or similar marking, stupidly failed to exclude products made overseas but assembled in the USA can't use that marking. Even companies such as Apple are guilty of this marketing manlipulation, where everyone knows iPhones and Macs are made in China, but they still love to slap the "Engineered in Cupertino, USA" large font on the packaging with microtext made in china text under or buried in the regulation text.
why not assembled in germany? now that one is clear to me (being a german). we germans have saussage fingers. we still can design but assembly is... kinda messy.
A Faraday sandwich might be tasty, but how would we know if we're blocked?? 🤔 Side note: loved the diversity and cancel jokes, especially when they were antithetical to one another. 😁👍
This is the least expensive line of Sennheiser, but is designed and built like a piece of military equipment! Excellent! Dave, I watch you on Odysee, but come to YT to see comments. Can you ask Odysee if they can occasionally update their "cloned" content with comments from YT? I think that this is holding them back.
That would be messy I think, as the comments wouldn't be associated with accounts. Then you have the issue of not everyone being happy having their comments copied to a platform they might not support. Could even be a copyright issue.
Dave. I've been watching your videos for years but you probably need to steer clear of all them "diversity" and "cancelling" jokes. This is one of the last channels left where I'm not reminded of the deep division and tension in the world these days and you probably should just steer clear of all that. Many of your viewers may not share the same opinions as you. We're here for electronics, that's it.
@@EEVblog Don't get me wrong, I wasn't personally offended. I just know the comments section is going to turn into a regular shitshow. That's what happens when you go anywhere near political stuff these days.
Another benefit to diversity (when using linearly polarised antennas) is that you can set the receiver antennas to different orientations (90 degrees apart) so as to significantly reduce the up to 20dB loss associated with the transmitter antenna being 90 degrees out of plane with the receiver antenna. Pretty handy if your transmitter is mobile and changes orientation regularly.
This is a way to go when setting up live events with wireless microphones...
That completely disagrees with recommendations for Wi-Fi radios capable of spatial diversity.
The antennas may be angled relative to the housing, but as a pair they should be parallel to each other.
@@howardhiggins9641 thats MIMO not reciever diversity
Hi Dave ! love your videos.
I used to work for a car radio manufacturer in the late 80s . They devoloped a didiversity receiver for the FM broadcast band. It could mix up to 4 atennas. The atennas were not switched, instead it fase shifted the intermediat frequency stage and summed up the signals and then to the demodulator. The net effect was sinthezising a directive atenna sensitivity pattern to maximise the best signal quality and reject intefering signal paths.
All done in analog domain !!
Range Rover P38 uses that exact system.
thats a phased array not a diversity system. Been round much longer than that
According to a 2019 interview with the two Sennheiser brothers, they maintain a presence at the US west coast to have a direct connection for the movie industry, and the east coast for the music industry. Also having a production facility in the country (Albuquerque) probably just makes sense.
The stand offs at the bottom are for the gang plate screws. Part of the rack mounting kit.
Dual IFs and dual mixers mean it is a double conversion receiver. The IFs are 241 and 10.7 MHz. Only the first LO is tunable. The service manual for a similar product, the OM100, is on elektrotanya.
Not a Faraday cage, more like a massive large multimode waveguide. Complete with random absorbers and filters all throughout the volume, so that you can get a point that is 30cm away from another, yet have 60dB of signal strength difference between them.
I love all the insight given with these teardowns. I learn so much about different design implementation methods that are otherwise difficult to discover. Even just a small comment in passing about something like the ground stitching vias can lead me on to learn about a whole new facet that I hadn't considered. Thanks Dave!
The second mixer is because this is a double conversion architecture. Pretty common in the 500Mhz to 1Ghz frequency range.
live sound engineer here, these receivers are fuckin bricks. don't even need road cases for these if taking them on tour
ruclips.net/video/YtI294cjKMc/видео.html
You learn so many things just by Dave's commentary on the process. Like how the input is ran under the board so that any imperfections in the metal shield won't hurt it. You'd never know this unless you had to design one of these type of circuits.
ruclips.net/video/YtI294cjKMc/видео.html
@@Mr_REBA I would love more electronics channels, yes, but spamming your content won't get you anywhere.
Sennheiser evolution user here (for decades!) Great units for both their wireless lav kits, XLR mic plugs (as seen on ISS / NASA all the time) - and I can confirm the receiver base stations are better than the small camera receiver units which can flutter a bit at times at distance. But on the whole, 10 hours battery life... super durable casing and connectors... easy to configure... can custom name on the displays for ID, etc. Staple of the news and video production industry! I glad to hear the Dave tick of approval on them.
22:00 yes, you can power these recivers from an antenna-combiner via the bnc
live sound engineer here, this is the answer. Company I work for has about 4 cases, each with 8 of these receivers and 2 combiners at the top. Larger gigs that require all 32 of the receivers will use another case that has another combiner to bring all 32 receivers into a single pair of antennas that will typically be placed stage left to front of house. Occasionally we'll use 1 antenna stage left, the other stage right, but we try to avoid this due to theoretical impedance mismatches with different cable lengths.
Those components look pritty tiny for powering the reseaver.
@@ceilingfanmusic6597 The receiver only draws 4 watts peak, so that diode is plenty big. And presumably both antenna connections would be feeding power, so the current in each of those diodes would be cut in half.
@@strehlow maby true but look at the components for the dc input compared to the phantom power in for the receiver. I'm sure it works but they just looked small to me lol
@@ceilingfanmusic6597 Without tracing everything, it isn't clear if the main power components are even used if phantom is there. Meaning does the phantom feed the inputs of the regulators, or replace them? Clearly it works, but I can't explain exactly why without studying it further.
The Antenna splitter can deliver power to the receivers through the antennas - saves a lot of space (and PSU pain) in a rack with many of these
Random teardowns are fun, but dumpster dives bring back memories. Good old days. Would love to see you doing them too.
ruclips.net/video/YtI294cjKMc/видео.html
With the lockdown, the building and hence dumpster room is empty.
"Disassembled in Australia" - Awesome!
The is actually rack mountable, it just doesn't have the hardware attached. The same case style is also used for the 1:4 aerial amplifier/splitter (which can also provide power over the bnc to the receivers), which might explain the extra mounting points.
We talking a 19” rack? That’s a *lot* of wasted space…
@@colejohnson66 yep, a 19" rack. They're designed to fit side by side, so you can get two receivers per 1U. In fact, now that I think about it, those extra mounting holes will be for the plate that is used to connect the two receivers together.
WOOOOHOOOO!!!! Someone who listens to their results!!! Love you man!
@22:00 Those diodes on the antenna inputs will be input protection to shunt excess input voltage to ground to prevent overloading of the front end, that is a common technique to prevent front end overload.
Doubtful. Were that the case, one end of each diode would be taken to ground as immediately as possible, and there would be no earthly reason (sorry) to run a long trace to connect the cathodes of the diodes together. Also, the ferrite beads would hurt the surge suppression capability. A quick scan of the user's manual shows that the ASA 214 antenna splitter is in fact capable of powering receivers via the RF input jack, so this appears to be the purpose of these circuits, and it explains the orientation of the diodes. The two ferrite beads and the the cap to ground help prevent noise on the system power rail getting into the RF input.
In less time than Dave spends in frenetic speculation he could have done a few simple continuity checks to see where the cathodes of the diodes connect into the system. Seems likely they go to the input side of a regulator. Were they connected straight to the supply rail, there would be no reason to connect them together with an isolated trace rather than dropping each one directly to an internal plane.
Speaking of diodes, perhaps more interesting are the two groups of three diodes on each of the input filters. Notice that they are in parallel within each group, and the anodes are grounded. There is a resistor connected to the cathodes, and that node also connects to a pair of paralleled capacitors that form part of the filter circuit. Unless there is a negative supply in the system, the diodes will always be either unbiased or reverse-biased. This, and the fact that there are 3 in parallel, suggests that they are varactor diodes used for tuning the filter, probably under processor control. Presumably, the three in parallel are needed to get more capacitance. Were they, say, PIN diodes for band switching, the orientation would be opposite and it seems unlikely that three would be necessary.
This is a lot more complicated than I would have expected! Halfway through the video I forgot what we were being shown and could've sworn it was a bit of test kit rather than just a wireless audio interface.
ruclips.net/video/YtI294cjKMc/видео.html
You didn’t mention Rayleigh fading - although you did kind of describe it. The effect of the multi path is to cause a deep fade / cancellation every half wavelength you move. Polarisation diversity antennas are often used in mobile phone systems to avoid too much clutter on rooftop sites - another way to achieve diversity without two physically separate antennas.
Can't wait for the next model, the Sennheiser "Diversity and Inclusion" receiver.
In modern German it would be called "Diversität:er:(+divers) und Inklusion:er:(+divers)"
Then they would go broke and insult the customers.
No it needs synergy!
And don't forget the assortment of male, female, and ambiguous connectors.
@@RS-ls7mm So kinda like Magsafe, but literally just 2 flat magnets on a flat surface so there's no "gender"?
I think the little camera receiver has diversity too. The second antenna needed for that ist actually the ground wire in the microphone cable.
Oops, you put that in the video, sorry. :-)
It's not a Faraday cage Dave, it's a giant capacitor, if you full charged it then shorted it out through a DeLorean it would generate 1.21 gigawatts of power
Except the plates are completely shorted together by the rest of the steel framework.
@@SomeDudeInBaltimore "bleeder resistors"
@@tythagoras5787 Very, very, VERY low resistance shunts
8:40 Dave just invented the Faraday sandwich
Hey look, it's Gary. 😊
Nice video! It seems to have overlooked one small but nice hardware feature of the EW100 G3: just left of the display, there is an infrared (IR) interface. Why? Quite clever: the wireless microphones / belt pack transmitters have such an interface as well. When held less than 10cm apart, the user can synchronise the programmed frequency and the user programmable mic name (“Vocals Peter”). Quite handy! Setting frequencies on these small microphone transmitters is not trivial, especially when you have multiple mikes and are working under pressure such as in live sound. The presence of this IR interface makes you wonder how 'standard' the display assembly is...
Talking multiple mics, some have already commented on the fact that the EW100 supports DC powering related to its two antenna inputs. Actually, if you look well at the labelling on the back panel in the video, you can already see it’s DC power into the device (from antenna to device), and not from device to (active) antenna.
Why does this feature make sense? Audio engineers often use multiple wireless mics/bodypacks, so also have multiple receiver units. Also, they often have their receivers at the back of the venue (‘Front of House’), with the microphones on stage, and then want to use well placed, directional antennas. For such users, Sennheiser was selling ASA 1 Antenna Splitter alongside the EW100 G3 series (now replaced by the ASA 214 which supports G3 and G4 units). It not only allows you to connect a set of good active or passive antennas to up to four receivers (or 8 using two splitters), but, using the DC powering feature, also power all these receivers. This not only makes the setup cleaners, but also more reliable. (Not irrelevant, I had a EW100 PSU failing myself, too bad that these expensive devices seem to come with not-so-good quality power adapters…)
Kind of in the opposite direction, for in-ear monitoring (IEM), Sennheiser has a similar system on the market: with an AC 41 antenna combiner, up to four (1/2) rack-mount *transmitters* can share a single antenna while the combiner also powers all these transmitters.
I'm guessing wireless mic systems are just sold more frequently in the US, the ones for the European market are also assembled in the US. (parts mostly made in China.)
Sennheiser ...... Ah now there is a name you can TRUST. I bought my twin daughters bottom of the range Sennheiser headphones ... like 5 years ago or something when my kids were 10, they cost like $15-20, but even my daughters could immediately tell the sound quality difference from all the BULLSHIT Dre Beats, and other "fashion" phones all their m8s had. And both sets are still working .... take away QUALITY does not always require a phat and open wallet :P
Except they recently sold the entire headphone brand. Wait to see what happens there.
@Shawn Bergin Is that epos like the old speaker brand?
for the old and cheap models I have (hd 415 and 457) the sound is just correct but the build quality is great compared to an AKG k242.
Great content Dave! Stuff like this is what got my in to your channel. I love receivers but would also like the see more trans content on your channel. It’s 2021 dude
In True Diversity, i was expecting phase adjustment between the two receivers rather then a switch.
This is a really Great teardown. Nice chip that mixer from Triquint 213. Another Ne602 like chip but 2.5ghz.
Add a sticker: "WATCHED IN GERMANY"
I was surprised to see the "True Diversity" model had nothing inside. Glad to see Dave is tearing down all the barriers now.
I have to start adding "Disassembled in ..." stickers to my torndown kit
Has anyone designed/written a site that uses image recognition to identify the "manufacturer" markings on ICs (& other components)?
Good idea! Like a google translate...
Maybe somebody else already mentioned this, but...
Sennheiser rack mount receiver (this one is rack mount receiver, it only need rack mount kit, mechanical steel stuff) have option to get DC power via RF BNC. Imagine setup with 8 receivers. Each receiver need 2 antennas and wall PSU, total 16 antennas + 16 coax cables + 8 PSUs. Now you need to put all these 16 antennas on stage or in TV studio and connect 8 wall PSUs in your rack. WHAT A CABLE MESS!
In these situation Sennheiser can sell you additional device called antenna distributor. Antenna distributor have ~20 BNC connectors on back and IEC12 power inlet. 2 BNCs for incoming antenna coax from stage, 16 BNC OUTs to receivers, 2 BNCs for linking (don't ask why, I don't remember why there are LINK BNCs). Antenna distributor split (and ampilfy a little bit) incoming RF signal from antenna and sent to every receiver, but... antenna distributor also deliver DC power to every receiver on the same BNC. So, now you only need one 230V AC power cord for every 8 receivers + distributor. Nice and clean cable management!
As bonus antenna distributor also deliver (receiver is not delivering) DC via BNC to antenna input specially for optional antenna 10 dB(?) RF amplifier.
ADF4117 is not a DDS, it's a PLL synthesiser
I have some dB technologies wireless systems where the RF cans are actually branded, something that you think might look a bit chintzy but actually it looks really smart, also it's wise to not their cost cutting in that the posher reciever with an LCD display and metal case actually uses the plastic case (rear and bottom) and mainboard from the cheaper reciever.
You need to acquire some older wireless systems now to teardown, the old TOA systems with the silver/gold/satin receivers are available quite cheaply and seem built very well, including using a built in PSU.
Also noting that despite their age (released in the early 80's, I've seen adverts from 1985) they use AAA batteries (x3) and as such you still get 5hrs of battery left with the battery low LED lit, some 9V systems don't last much longer on a full battery, total rated battery life is quoted as 30hrs and I for one believe them.
These days when I bring home a new gadget I open it up to see the quality of construction etc. and take photos in case I want to refer to them in the future.
CoolAudio is Behringer/MusicTribe, they make knock off of out of patent chips.
Wow, Behringer, really?
22:05 - correct, you can get an antenna distributor that will power this unit over the BNC cables - see Sennheiser ASA 214. now a question for you..
i have Sennheiser IEM transmitters which are powered from an antenna combiner over the BNC cables. i also have a Shure PSM300 antenna combiner, which isn't powered over BNC. will plugging the powered combiner into the PSM300 damage the latter?
The unit can also be setup as a bug so you could login from over the internet and listen to where the Sennheiser EW100 is installed.
Qorvo has been around quite a while. In Wi-Fi they tend to make the higher quality. mid-scale hardware. There products would not be used in cheap, low cost products that are meant to be sold at the cheapest price.
Why are lots of youtubers doing this cartoon thumbnail thing? Is it a new craze I have missed again?
I looks like we won't be seeing much more of Norwest Business Park and surroundings 🐀🐇🦎🐍🦆🦢🦜
I love vids like this keep up the good work
Hi Dave, I guess it's usual company politics. Much european companies do produce and deliver from USA to "APAC" (i. e. "Asia and Pacific") market from USA for (delivery-/ energy-) price and tax reasons. The only difference inbetween european market models and other countries is just the RF module setting, sometimes the RF module itself. Maybe some internationalization thingy for the user interface. All other hardware parts are the same. This is why the german company "Sennheiser" does development in germany but produces foreign country versions outside europe.
I'd love an Evolutionm Wireless setup for home, they sound great, i've been using the me-3 head mic for years for voice recognition, solid as heck and sound amazing for the money.
Is the new icon pack for DaveCAD a paid upgrade ? I cant find it anywhere....
" Cuz everyone knows that in 2021 you can' have no diversity, because well, you''l get cancelled and stuff! " Excellent, just excellent
The sensitivity is pretty high
Do you have a current review of latest TV antennas, ones that can be used inside home? I would like to clip my cable TV.
Now A Jammer to Jam it! Perhaps a Zener Noise modulated to A triangular sweeps?
Could the mystery mixers be for transmitting the ADF singal?
I think modern diversity receivers do some maths (I know, nasty business) with both received signals to get a better signal than any of the original ones.
In the 60s I used diversity receivers at a NASA satellite tracking station. They combined the two signals according to their signal strengths. All analog in those days.
That's called "beamforming".
Ah, Gary. Poor obsolete Gary. New daddy Qorvo promptly disowns him. I wonder who Gary's replacement will be? Who will be Qorvo's new favorite downconverter?
Thank u Sir
Survey result spoiler before the analysis video 😠
Oh, yeah, spoiler alert!
Spoiler: Mailbag is not, in fact, everyone's favorite segment?!
So Dave, a serious question.
Multiple news outlets in the US are showing pictures of supermarkets with empty shelves in Australia.
Is it really that bad in parts of your country ?
?!! First I've heard of that. Not sure about Dave's suburb, but I can assure you it's not even been a news story down south for the most part. I think some of the small regional places are struggling with some product lines because they've blocked the roads to avoid cases. But in the cities it's mostly fine. I went shopping tonight and it was business as usual. Roast Lamb on special, grabbed a bunch of fresh vegies too. The only issues in the cities where most of the population lives has been in a few suburbs because if there is a single detected Covid case that has visited the Supermarket (masked member of the public)... the whole supermarket staff has to test and stay home until results come back. So it means there's no staff / supermarkets have to scramble new staff together for that store - which has taken some logistics but they are pretty good at it now. But rest assured, there's tons of food within easy logistical reach - even if it's not on shelves sometimes. The biggest 2 cities are in "stay-at-home-where-possible" mode at the moment, with some suburbs in "stay-home" enforcement mode due to case clusters. We're all waiting for vax's to hit "80%" so they can start relaxing rules a bit - and it looks like we're on track for that by late October in worst effected areas. Although in truth, the "80%" is stupid metric because it doesn't include kids under 16. Singapore is a few months ahead of us with 80% of full population of all ages vaxd and currently saying they think the number needs to be more like 90% for a safe reopening. So that'll ultimately take us into next year. But y'know - we'll probably be allowed to travel over Christmas as most Australians will lose the plot if they can't have a beer and a BBQ with the family on Christmas day!! So in short, yes, there's probably a few small places (like less than 0.1% of population) where they have interrupted supply lines, but for the most part, there's food, tons of alcohol, coffee, click-and-collect, a slightly slower postal service and a bunch of slightly "over it" Aussie's counting down the days until Christmas holidays. Hope you're doing ok where ever you are from!!
Can the processor mix both channels and adjust for phase differences? Or does it just switch to the strongest?
Also is it good practice to point antenna in different axis? My wifi card has 3 antenna and I point each in a different axis. No idea if I should!
You'd generally just switch.
Helo.Ask for guidelines for fixing the wireless microphone's not turning on condition.body pack senshienser g3
"Disassembled in Australia.." Comes from someone who knows you.
I have the exact same wireless receiver but with a vocal mic.
Cheaper in the US I guess? That models frequency probably isn't fit for the EU market
Don't know about the rest of Europe but in Poland 600MHz range is perfectly fine for unlicensed use.
Call me stupid, but were was the actual switch?
can u turn off "zoom" OSD for microscope? u tend to include a lot of text annotations, so i found my eyes jumping to the corner expecting something interesting upon every zoom lol.
You mean not have my head in the corner? It's way more personal to see people talking than just a voiceover.
@@EEVblog No Dave, we love your smiling face, I think he's referring to the OSD i.e. On Screen Display from the Microscope.
@@EEVblog NO dude Lol.. the zoom factor text in the top-left..
Dave, do a video on the differences between IF, and RF.
If I can try to summarize it... RF is the frequency high enough to propagate efficiently from the antenna, but at the receiving end it gets converted to a lower one (hence _intermediate_ frequency) which is easier to work with. If all the circuit worked on the higher frequency the values of components and PCB layout would both be impractical. Therefore, that RF is brought down to an IF to process it.
I call bullshit on that being Gary, Gary is much older, ca 1980's:
en.wikipedia.org/wiki/Amiga_custom_chips#Gary
I’m black. I came to receive all this great diversity.
Can't wait for the video about Male and Female conectors and how they plug in each other.
7:20 I like that the tin foil hat made it into the Dave Cad schematic
Coolaudio also makes a bucket brigade echo chip V3205D
What happen to the Eakins microscope?
The Tagarno is better and more flexible.
ah the fpv Quadcopter recievers use a similar system with two rx5808 5.8ghz reciever modules and then use a cd4066 for the switching of the recievers, well not the signal but they switch between the composite video out
I had an A/V input selector that used 4066s and I noticed that the colors would change slightly when going through it. The blue screen of a VCR with no tape (yeah it was that long ago) looked a lighter, more grayish blue. So if your image looks a little washed out, try looking at the video signal before the switch.
@@gabotron94i didn't know that but for my application its suitability since Quadcopters are moving at very high speed and the noise in the video from the wireless transmission makes it something negligible, still i will see how much of a difference it makes
"Diversity is our strength"
Dissasemled in Australia....cool
I was expecting more transistors and transformers on a true diversity system
Anyone else want a Faraday Samwidge t shirt? Or is it just me?
22:13 unless you power it with negative voltage
But Dave a PLL is not a DDS as you tried to sell to us ;)
Sweet! Can't wait for the next Dumpster dive. Free crap is the best crap EEVen if ya gota fix it.
Assembled in USA is probably a tax thingy. My G4 equipment only says Made in Germany. Makes sense for the Europe market I guess
How do you not have a million subscribers?
Niche market appeal, annoying voice, overly long videos.
@@EEVblog lol
True diversity reciever - it's like a full bridge rectifier...
Look! Teletubbie-Dave!
Engagement, yay!
It’s in black color hence true diversity.
Hell yeah ! Back off all you fridges and dishwashers, we don't want none of those white privileged goods trying to take control of this channel !!
Diverse black body radiation...
Does Dave seem strange...er? lockdown getting to him maybe. Still a great video though.
I'm not locked down, I go to the lab every day just like normal.
it being made in Germany but assembled in the US is a tactic/loophole so that they can possibly slap a "Made in USA" or some sort of related USA designation sticker or print on the packaging and appeal to those who like to buy "US made" products, because the politicians or agency (FTC) that made the rules for products that can use the "Made in USA" or similar marking, stupidly failed to exclude products made overseas but assembled in the USA can't use that marking. Even companies such as Apple are guilty of this marketing manlipulation, where everyone knows iPhones and Macs are made in China, but they still love to slap the "Engineered in Cupertino, USA" large font on the packaging with microtext made in china text under or buried in the regulation text.
why not assembled in germany? now that one is clear to me (being a german). we germans have saussage fingers. we still can design but assembly is... kinda messy.
I can't subscribe to a chip named Gary on twitter! haha. that made me want to
A Faraday sandwich might be tasty, but how would we know if we're blocked?? 🤔 Side note: loved the diversity and cancel jokes, especially when they were antithetical to one another. 😁👍
Work is cheaper in former rim-world colonies, like the USA, than in Germany.
I can imagine the outrage if a university student saw this piece of AV equipment in the back of the classroom
101 on how to make a electronics video about politics.
This is the least expensive line of Sennheiser, but is designed and built like a piece of military equipment! Excellent!
Dave, I watch you on Odysee, but come to YT to see comments. Can you ask Odysee if they can occasionally update their "cloned" content with comments from YT? I think that this is holding them back.
That would be messy I think, as the comments wouldn't be associated with accounts. Then you have the issue of not everyone being happy having their comments copied to a platform they might not support. Could even be a copyright issue.
@@EEVblog Yup
This one had me cracking up. You diversity fan boys.
LMAO... "you're gonna go broke"
ROFL THE ETHERNETTIES!
Dave. I've been watching your videos for years but you probably need to steer clear of all them "diversity" and "cancelling" jokes. This is one of the last channels left where I'm not reminded of the deep division and tension in the world these days and you probably should just steer clear of all that. Many of your viewers may not share the same opinions as you. We're here for electronics, that's it.
Chill out. If you can't have a joke about something then it's a sad world.
@@EEVblog Don't get me wrong, I wasn't personally offended. I just know the comments section is going to turn into a regular shitshow. That's what happens when you go anywhere near political stuff these days.
@@SomeDudeInBaltimore Except that it didn't, look at the comments, hardly anyone mentioned it, because they get it's just an obvious meme worthy joke.
@@EEVblog You're right. It's nice that the fanbase here seems a bit more mature than the rest of youtube.
@@SomeDudeInBaltimore come on Dan, YOU made it into an issue.