Fantastic summary Michael. Thank you for making the information available and the presentation so clear. Very well done and very much looking forward to future updates. I really do enjoy the historical perspective you bring to so many of your presentations. Bloody good show Old Chap!
Very fine series. Thank you for the brief overview of the history of modulation, a subject that's not often discussed in detail. I think of it as being all in the wrist, so to speak. It needs to be optimized as much as the carrier and amplifier circuits to get the best possible signal out to the radio. Your timing is excellent, too, as I recently purchased a K-488 transmitter from AES and plan to build it with as much Hi-fidelity AM as I can get. Looking forward to part 2!
About 15 years ago I played with such ideas, but it wasn't part 15, no no no. Started with 10W AM on around 1500khz. 7m high helically loaded antenna stuffed into a pay tv antenna mount, exploiting the roof for a ground. Got a good match and it got got out surprisingly good
you probably dont care but if you guys are bored like me atm you can stream pretty much all the latest movies on instaflixxer. I've been streaming with my brother for the last months :)
In high school we found an AM carrier-current transmitter (tubes--this was around 1979 and the thing was quite old), so of course we connected it to a long random wire using a tuner (Swan?). One of us was old enough to drive, so we sent him around southeastern Nassau County NY and he'd call in reception reports from pay phones. The coverage wasn't quite what our (licensed) 10-watt FM station provided, but still interesting.
That's a very interesting topic. I'm looking forward to the second part. I will test the transmitter with an ECH81. This tube is more up to date here in Germany and also has a triode part for pre-amplifying the audio.
I recall seeing that use of a pair of 6.3V transformers to do, Line/6.3/HV in an old Ham handbook. The AM(and FM) transmitter circuits that I built, used Transistors. But I do recall a circuit from PE for a 5W Carrier Current AM TX that used tubes.
Wish I knew what you're talking about, but darn sure is interesting. I'm a retired machinist and blacksmith so I've never been into electronics, but I find it fascinating !!
OMG! Does this ever take me back! And dang! That means I am getting old!!! Now I want to resurrect my youth and build me another one! Being out here in the rural, I can run a longer antenna and beef up the rf output some and not get into trouble.
Nice work Mike. I see Bob Shrader W6BNB's "Electronic Communication" on your bookshelf...we used the blue cover 2nd edition in our high school electronics shop in the late 60's. He was a nice guy BTW and we sadly lost him in 2012 as I recall. Be careful, collecting all the editions can become addictive! AND you "sointingly" have great taste as well with "Moe Howard and the Three Stooges", a lifelong favorite (the DVD set of all their shorts and movies is a keeper). TNX for the intro and look forward to Part 2. 73 - Dino KL0S
I don't know how I missed this series of videos but they answer a lot of my questions as a mature returner/beginner to radio and amateur radio. Can I make the point that your fan/subscriber base is not limited to the US but is international. Therefore, some preface of "Part 15" would be useful. I Googled it but the results were not concise, more ambiguous. It would be very helpful if you could explain the relevant pieces of Part 15 in the style you do so well. Maybe a topic for a short video?
Great series. I believe an early attempt at AM broadcast put a carbon microphone IN SERIES WITH THE TRANSMITTER OUTPUT/ANTENNA LEAD. Talent had to carefully stand back from the mike-high voltage, hot!! I’ve wanted to make a Part 15 xmtr that met ALL requirements: max power into the final stage 200 MW; good linearity-good audio; and a good match to the maximum 9 ft antenna. Unless the final is high efficiency-Class C-you sacrifice potential output power output, and therefore range. A good output match is the Achilles heel of all the “boy’s radio transmitter” circuits. You will need a lot of coil to overcome the capacitance of 9 ft at 1 MHz to 1.7 MHz. (And if the coil is exposed it counts as part of the 9 feet max length). With a bad match you’ve effectively built all the drawbacks of previous poor designs into the fruit of your research and hard work. Just about demands a plate modulated class C stage. With a VERY carefully designed tank circuit. Lots of headaches. J. Foote W3GX (also former broadcast chief engineer-ah... those were the days). Love the video.
Yes series mod with a stack of carbon mics in series parallel with a reverse horn and a guy yelling loudly while his tounge sizzles! I am glad that you chimed in. Yes the hobby transmitters and the real radio station are at the opposite sides of this subject!
I have the tube AM transmitter made by Lafayette to feed music to my antique radios. It's cute. It has that 'tube' sound, and I like it. But it doesn't really hold a candle to the sound quality of a good solid state, low-power FM stereo transmitter.
It is all about safety isolation. You can find conventional old style tube power transformers now, but they can be pricy. If you do the back to back trick, you get the isolation and low voltage for the filaments and HV, and you can use those low cost control transformers. Another trick is to use a split primary transformers, sacrificing one primary as the HV out.
Great presentation! 👍🏻 Have you made the power supply yourself? I am going to try to make my own first tube circuit soon (the Morgan Regen you showed in the video), and the power supply is what is holding me back.
That transformer style on the little blue supply with the 4 independent windings has a dual 120V and dual 12V windings allowing use in EU or US. But the advantage is that you are able to replace turns ir remove turns on any of them to customize the voltage. The ideal setup for the Morgan would be a transformer with a 6.3V and a 30 to 50V winding which would peak up to 45 to 90 VDC when rectified and filtered. Two 120 to 6.3V units can be used back to back as shown, but you would need a voltage divider because the voltage would be a bit high at 120 to 150 VDC. Regens like this like lower voltage to be more stable for receiving and controlling the regeneration.
Those blue jobs were taken out of an old ATX power supply and they were across the line. They do have a lot of safety markings on them. Never knew that these were special beyond an adequate AC voltage rating...
Have you not tried the low voltage TELEFUNKEN GMBH vacuum tubes? DSB with a low level carrier. What about implementing a SO42P using 3x 12AX7 vacuum tubes or if you can get them 3x ECC88 tubes, just Google www.angelfire.com/planet/funwithtransistors/Book_CHAP-4B.html and it is Figure 4B.8 that you need to look at for this mixer, what about using low voltage vacuum tubes to cut down on the shock hazard.
I have no experience with the low voltage enhanced emission valves but if anyone could make them, it would be Telefunken! And less shocking is always appreciated! Of course you guys have 230 VAC so you are starting high on the mains and that is a safety issue for beginners and old guys alike.
Мне кажется разрешить заказ руб заказать доставку по журнала зарубежные каталоге радиолюбитель тоже самое России радио журнала подробнее о товаре чертежей описание всех схемами найдено результатов поиска информации инструкция инженера идр. Московская область Ногинск район Кудиново ул свободная СТН фабричка сторож ЛАЗАРЕНКО КОНСТАНТИНОВИЧ ВИКТОР.
Fantastic summary Michael. Thank you for making the information available and the presentation so clear. Very well done and very much looking forward to future updates. I really do enjoy the historical perspective you bring to so many of your presentations.
Bloody good show Old Chap!
Very fine series. Thank you for the brief overview of the history of modulation, a subject that's not often discussed in detail. I think of it as being all in the wrist, so to speak. It needs to be optimized as much as the carrier and amplifier circuits to get the best possible signal out to the radio. Your timing is excellent, too, as I recently purchased a K-488 transmitter from AES and plan to build it with as much Hi-fidelity AM as I can get. Looking forward to part 2!
Very well explained! Thank you, big thumbs up from Germany :-)
About 15 years ago I played with such ideas, but it wasn't part 15, no no no. Started with 10W AM on around 1500khz. 7m high helically loaded antenna stuffed into a pay tv antenna mount, exploiting the roof for a ground. Got a good match and it got got out surprisingly good
10:10 "Oh my Cod", lol, this is great. I hope you have many additional videos on this favorite topic! Excellent!! 👍👍👍
you probably dont care but if you guys are bored like me atm you can stream pretty much all the latest movies on instaflixxer. I've been streaming with my brother for the last months :)
@Elisha Arturo Yup, I have been using instaflixxer for years myself :D
@Elisha Arturo yea, have been watching on instaflixxer for since november myself :)
@Elisha Arturo Yup, have been watching on instaflixxer for since december myself :)
@Elisha Arturo Yup, have been watching on InstaFlixxer for years myself :)
BEAUTIFUL BEAUTIFUL BEAUTIFUL !!! What GREAT timing . I was just exploring this as one of my next projects 😁 Can't wait !!!
In high school we found an AM carrier-current transmitter (tubes--this was around 1979 and the thing was quite old), so of course we connected it to a long random wire using a tuner (Swan?). One of us was old enough to drive, so we sent him around southeastern Nassau County NY and he'd call in reception reports from pay phones. The coverage wasn't quite what our (licensed) 10-watt FM station provided, but still interesting.
Great shirt! my favorite magazine. Great video as usual Mike I always learn when I watch you, thanks !
That's a very interesting topic. I'm looking forward to the second part.
I will test the transmitter with an ECH81. This tube is more up to date here in Germany and also has a triode part for pre-amplifying the audio.
Very interesting! This sounds like an excellent approach and still one valve!
@Ryben Flynn nobody is old enough to call it a valve on this side of the pond. I do it for the people of Fleming. The Flemish.
I recall seeing that use of a pair of 6.3V transformers to do, Line/6.3/HV in an old Ham handbook. The AM(and FM) transmitter circuits that I built, used Transistors. But I do recall a circuit from PE for a 5W Carrier Current AM TX that used tubes.
Just found your channel and I'm enjoying it alot. I subscribed.
Thank you. I learned a lot from your video.
Glad that you enjoyed it Alex. Will you build a broadcaster?
@@MIKROWAVE1 Yes. ☺️
Wish I knew what you're talking about, but darn sure is interesting. I'm a retired machinist and blacksmith so I've never been into electronics, but I find it fascinating !!
OMG! Does this ever take me back! And dang! That means I am getting old!!! Now I want to resurrect my youth and build me another one! Being out here in the rural, I can run a longer antenna and beef up the rf output some and not get into trouble.
Nice work Mike. I see Bob Shrader W6BNB's "Electronic Communication" on your bookshelf...we used the blue cover 2nd edition in our high school electronics shop in the late 60's. He was a nice guy BTW and we sadly lost him in 2012 as I recall. Be careful, collecting all the editions can become addictive! AND you "sointingly" have great taste as well with "Moe Howard and the Three Stooges", a lifelong favorite (the DVD set of all their shorts and movies is a keeper). TNX for the intro and look forward to Part 2. 73 - Dino KL0S
My goodness it looks like you found some of my toys, from days long gone. You have a great mind and sense of humor.
🎙73's kd9oam
What do you think of the Knight Wireless Broadcaster?
I don't know how I missed this series of videos but they answer a lot of my questions as a mature returner/beginner to radio and amateur radio. Can I make the point that your fan/subscriber base is not limited to the US but is international. Therefore, some preface of "Part 15" would be useful. I Googled it but the results were not concise, more ambiguous. It would be very helpful if you could explain the relevant pieces of Part 15 in the style you do so well. Maybe a topic for a short video?
Yeah maye be a Part 15 primer. Luckily Part 15 never went away. Mostly because once the FCC makes a rule, its so hard to change it.
Great series. I believe an early attempt at AM broadcast put a carbon microphone IN SERIES WITH THE TRANSMITTER OUTPUT/ANTENNA LEAD. Talent had to carefully stand back from the mike-high voltage, hot!!
I’ve wanted to make a Part 15 xmtr that met ALL requirements: max power into the final stage 200 MW; good linearity-good audio; and a good match to the maximum 9 ft antenna.
Unless the final is high efficiency-Class C-you sacrifice potential output power output, and therefore range. A good output match is the Achilles heel of all the “boy’s radio transmitter” circuits. You will need a lot of coil to overcome the capacitance of 9 ft at 1 MHz to 1.7 MHz. (And if the coil is exposed it counts as part of the 9 feet max length). With a bad match you’ve effectively built all the drawbacks of previous poor designs into the fruit of your research and hard work.
Just about demands a plate modulated class C stage. With a VERY carefully designed tank circuit. Lots of headaches.
J. Foote W3GX (also former broadcast chief engineer-ah... those were the days). Love the video.
Yes series mod with a stack of carbon mics in series parallel with a reverse horn and a guy yelling loudly while his tounge sizzles! I am glad that you chimed in. Yes the hobby transmitters and the real radio station are at the opposite sides of this subject!
I have the tube AM transmitter made by Lafayette to feed music to my antique radios. It's cute. It has that 'tube' sound, and I like it. But it doesn't really hold a candle to the sound quality of a good solid state, low-power FM stereo transmitter.
No doubt about that! Wideband FM has many advantages.
simple transistor pierce crystal osc with collector modulated using a transformer also works ok.
Superb!
Might add a 6av6 or 1/2 12ax7 as an audio preamp. (I'd use two stages of 12AU7 because I so many of those tubes)
I'm wondering about the back to back transformers. Is the sole purpose to pull filament voltage at 1st transformers output ??
It is all about safety isolation. You can find conventional old style tube power transformers now, but they can be pricy. If you do the back to back trick, you get the isolation and low voltage for the filaments and HV, and you can use those low cost control transformers. Another trick is to use a split primary transformers, sacrificing one primary as the HV out.
@@MIKROWAVE1 Always helpful Mike !! Patiently waiting for Part 2 😁😁
Nope, never had issues with the audio 🤣
any chance you can look at crystodyne transmitters?
Great presentation! 👍🏻
Have you made the power supply yourself?
I am going to try to make my own first tube circuit soon (the Morgan Regen you showed in the video), and the power supply is what is holding me back.
That transformer style on the little blue supply with the 4 independent windings has a dual 120V and dual 12V windings allowing use in EU or US. But the advantage is that you are able to replace turns ir remove turns on any of them to customize the voltage. The ideal setup for the Morgan would be a transformer with a 6.3V and a 30 to 50V winding which would peak up to 45 to 90 VDC when rectified and filtered. Two 120 to 6.3V units can be used back to back as shown, but you would need a voltage divider because the voltage would be a bit high at 120 to 150 VDC. Regens like this like lower voltage to be more stable for receiving and controlling the regeneration.
Try using a 6au6 as a preamp.
6AU6 is an excellent mic preamp. Unless you get a humming 6AU6. Sometimes you get some nasty examples that have the filament shorted to the cathode
Those Blue Caps. should be *safety* *caps* .
Those blue jobs were taken out of an old ATX power supply and they were across the line. They do have a lot of safety markings on them. Never knew that these were special beyond an adequate AC voltage rating...
Billy Wizard!
WHY PUT GAIN SOAP 🧼 IN THE CIRCUIT LOL 😂😆😝
Obviously for more Gain!
AES?
Long out of business as far as I know
@ about 21:30
Dunno but: www.amazon.com/AES-Kits-Wireless-Transmitter-DIY/dp/B005XE3GSQ/ref=asc_df_B005XE3GSQ/?tag=hyprod-20&linkCode=df0&hvadid=312123579962&hvpos=1o4&hvnetw=g&hvrand=9331375239155555612&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9002296&hvtargid=pla-568112158540&psc=1&tag=&ref=&adgrpid=65834404201&hvpone=&hvptwo=&hvadid=312123579962&hvpos=1o4&hvnetw=g&hvrand=9331375239155555612&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9002296&hvtargid=pla-568112158540
Have you not tried the low voltage TELEFUNKEN GMBH vacuum tubes?
DSB with a low level carrier.
What about implementing a SO42P using 3x 12AX7 vacuum tubes or if you can get them 3x ECC88 tubes, just Google www.angelfire.com/planet/funwithtransistors/Book_CHAP-4B.html and it is Figure 4B.8 that you need to look at for this mixer, what about using low voltage vacuum tubes to cut down on the shock hazard.
I have no experience with the low voltage enhanced emission valves but if anyone could make them, it would be Telefunken! And less shocking is always appreciated! Of course you guys have 230 VAC so you are starting high on the mains and that is a safety issue for beginners and old guys alike.
Мне кажется разрешить заказ руб заказать доставку по журнала зарубежные каталоге радиолюбитель тоже самое России радио журнала подробнее о товаре чертежей описание всех схемами найдено результатов поиска информации инструкция инженера идр. Московская область Ногинск район Кудиново ул свободная СТН фабричка сторож ЛАЗАРЕНКО КОНСТАНТИНОВИЧ ВИКТОР.
Thanks for watching VICTOR. Виктор, ты строишь радиомодули? Вы радиолюбитель?