Great introduction to reading these graphs. I finally understand. Much appreciated. building a diversity ground station with an Oracle switcher in January. looking forward to your next fpv videos.
Nice intro to antennas. I like how you make your vids simple to comprehend. I need to watch more of the tuning ones using blackbox. If you do another antenna video, it's worth correlating the signal being propagated from the craft to the base station and the best orientation of the Vtx antennas relative to the ground station for different craft attitudes. Smith charts. Uni days were so long ago. I would never have thought back then that i would ever use one in my hobby. Shows how narrow minded i was when i was young! Keep up the great work.
in think it's great how you explain the details, not going to crazy making a one hour long video. you explain what needs to be known. thank you! I'm Definitely going to be watching this, and the other video on antennas again!
Caught some of your older vids yesterday about antenna's - couldnt find the one in particular but wanted to add a comment. I havent seen this one before so maybe you address it here. I was curious if you've done any tests about signal str difference by directly attaching the antenna vs having adapters and/or extensions. I doubt there is much of a difference in real world usage and it does differ based upon the connectors used (and cable between ant and mount) but - was just curious. Aside from 'antenna theory', every connection does soak signal. I wonder if you could get appreciably better results by directly soldering the antenna to the RX or VTX. I imagine the enemy so to speak is still LOS and solid objects. Side note I am HAM General class. Im certainly not an expert. My Spektrum receiver is clear in that one should be vertical and one should be horizontal. There are literally 0 examples of how my antennas look compared to everyone else. Mine looks like an L, everyone else looks like flattened out tail feathers lol. For my flying - works just fine. But, Im a geek so, Im curious.
Hi Joshua, I'm working now on my FPV range, heard that 600mw FPV transmitter should give about 3 km range, but I actually could not get more than 800 meters (Using TBS Unify, TBS Triumph and TBS Tango as FPV receiver). Is it worth moving all the antennas underneath the quadcopter so they won't be obstructed by the copter itself while on high altitude? Maybe something else to maximize the coverage?
Yeah I could see that. but you would have to always hold your antenna straight up and down. When the antenna orientation moves (such as a handheld transmitter) then a low-gain omni provides most consistent results.
Really great info here, thanks. I've often wondered why 1/4 wavelength antennas are use instead of 1/2 or full. It makes sense to me that a full wavelength length antenna would get more signal than a shorter one. I guess this isn't true. Why not use a 1/8 length? What's the story here?
Here is some good information. The long and short of it is that half-wave and quarter-wave don't always perform worse than full-wave, depending on other factors. And sometimes it is worth it to take a performance hit in order to achieve some other characteristic, like smaller size. www.digikey.com/en/articles/techzone/2011/mar/understanding-antenna-specifications-and-operation www.eham.net/ehamforum/smf/index.php?topic=21197.5;wap2
+Joshua Bardwell Thanks, this is interesting stuff. It seams that a stronger signal isn't the only factor in quality of signal. I really must address my more is better thinking! I can barely control my mini quad because I wanted more thrust before I learnt to fly the thing. Re-re building it with more sense now.
I've wanted to stop watching you for at least 8 hours now. I keep getting sucked in video after video just due to sheer intrigue of your breadth of knowledge about this crap. You make other review channels seem sooooo useless.
Great introduction to reading these graphs. I finally understand. Much appreciated.
building a diversity ground station with an Oracle switcher in January. looking forward to your next fpv videos.
+L Pablo Mendez Really glad to hear it. "I finally understand." I live for comments like that!
Nice intro to antennas. I like how you make your vids simple to comprehend. I need to watch more of the tuning ones using blackbox.
If you do another antenna video, it's worth correlating the signal being propagated from the craft to the base station and the best orientation of the Vtx antennas relative to the ground station for different craft attitudes. Smith charts. Uni days were so long ago. I would never have thought back then that i would ever use one in my hobby. Shows how narrow minded i was when i was young! Keep up the great work.
in think it's great how you explain the details, not going to crazy making a one hour long video. you explain what needs to be known. thank you! I'm Definitely going to be watching this, and the other video on antennas again!
Caught some of your older vids yesterday about antenna's - couldnt find the one in particular but wanted to add a comment. I havent seen this one before so maybe you address it here. I was curious if you've done any tests about signal str difference by directly attaching the antenna vs having adapters and/or extensions. I doubt there is much of a difference in real world usage and it does differ based upon the connectors used (and cable between ant and mount) but - was just curious. Aside from 'antenna theory', every connection does soak signal. I wonder if you could get appreciably better results by directly soldering the antenna to the RX or VTX. I imagine the enemy so to speak is still LOS and solid objects. Side note I am HAM General class. Im certainly not an expert. My Spektrum receiver is clear in that one should be vertical and one should be horizontal. There are literally 0 examples of how my antennas look compared to everyone else. Mine looks like an L, everyone else looks like flattened out tail feathers lol. For my flying - works just fine. But, Im a geek so, Im curious.
Hi Joshua, I'm working now on my FPV range, heard that 600mw FPV transmitter should give about 3 km range, but I actually could not get more than 800 meters (Using TBS Unify, TBS Triumph and TBS Tango as FPV receiver). Is it worth moving all the antennas underneath the quadcopter so they won't be obstructed by the copter itself while on high altitude? Maybe something else to maximize the coverage?
+nandakoryaaa 3 km on 60o mW must be under absolutely ideal conditions. I have never gone that far on it.
Seems Tango is the weak link since diversity goggles are still receiving clear picture while Tango already has lost it.
so a high gain dipole antenna works better for rc cars since they are on land always, and it focus more horizontally on its beam strenght?
Yeah I could see that. but you would have to always hold your antenna straight up and down. When the antenna orientation moves (such as a handheld transmitter) then a low-gain omni provides most consistent results.
Really great info here, thanks. I've often wondered why 1/4 wavelength antennas are use instead of 1/2 or full. It makes sense to me that a full wavelength length antenna would get more signal than a shorter one. I guess this isn't true. Why not use a 1/8 length? What's the story here?
+Dan Holmes Oh ok, a quick look on wikipedia and it all makes sense now! Well not to me, but I can now see that I was barking up the wrong tree.
Here is some good information. The long and short of it is that half-wave and quarter-wave don't always perform worse than full-wave, depending on other factors. And sometimes it is worth it to take a performance hit in order to achieve some other characteristic, like smaller size.
www.digikey.com/en/articles/techzone/2011/mar/understanding-antenna-specifications-and-operation
www.eham.net/ehamforum/smf/index.php?topic=21197.5;wap2
+Joshua Bardwell Thanks, this is interesting stuff. It seams that a stronger signal isn't the only factor in quality of signal. I really must address my more is better thinking! I can barely control my mini quad because I wanted more thrust before I learnt to fly the thing. Re-re building it with more sense now.
excellemt summary, thanks for your time :-)
Interesting, cant wait for the next...
+Cool Kwad Scheduled for Monday.
Every placement vids too much tech. Not enough real world demo of to placement on the rc plane
I've wanted to stop watching you for at least 8 hours now. I keep getting sucked in video after video just due to sheer intrigue of your breadth of knowledge about this crap. You make other review channels seem sooooo useless.
Glad you are enjoying the content!