3:55 The mic's getting overdriven - it CAN sound better, I've managed to get almost "normal" voice out of it fiddling with the mic gain, noise level, and listening to a nearby SDR webchannel. The most common mistake is putting the mouth next to the mic holes, and talking too loudly! It works much better at arms length with a normal speaking voice.
@@SarahC2 I just tried receiving it with a websdr...that sounds better...I have the feeling somehow the distance makes the audio sound better. Do you tried recording it with a second radio close to you?
@@CrazyChekov I originally tried with an ATS 20+ little radio receiver (I don't have an expensive HR rig) , and all I was getting was crackling crisp packets with it. I unplugged the radio antenna, and surprisingly that didn't help! I guess the PCB was acting as an antenna and screwing up all the audio.
thx for your comment ! i really tried a lot. made all the filter adjustments and measured them...maybe you can share your settings or what you have done. It sounds better when the receiving signal gets weak. ...but like I said...even with that bad sounding SSB....this is a game changer.
I think you need to feed your mic input with a 2-tone audio signal and play with all of the adjustments available on the (tr)uSDX while watching the RF output signal on an o'scope until you have cleaned up the SSB audio. Mine sounds much better than yours does and I've done nothing except tune the SSB audio signal path for lowest distortion. These rigs are the price they are because they lack all sorts of circuitry to make everything work optimally out of the box. With a simple rig like this a ham needs to do the work of optimizing it's signals, both audio and RF. In addition to hardware tuning adjustments to optimize transmit efficiency and harmonic filtration, there are more adjustments to be found in the software menus. At a guess I'd say your output FET's aren't properly biased for linearity. Manuel's tuning video on TH-cam for the Xmitter output stage is very informative but doesn't explain everything about the optimization of other aspects of optimizing the rigs. Note that a class E amplifier gets its efficiency by being a resonant circuit at the transmitting frequency, so only a single frequency can actually be tuned for maximum efficiency on a given band, with efficiency dropping off at frequencies above and below it. It's a good idea therefor to decide on a center frequency in a given band you want to use, and tune up that band on that frequency. I'm getting between 85 and 93% efficiency depending on the band. Good luck.
@@CrazyChekov We did it with a second radio. NVIS about 100 miles apart. I was on the truSDX radio so I didn't hear it but my buddy didn't said he could hear me just fine. Sorry, not very scientific, just a data point. :)
@@CrazyChekov I used the KiwiSDR VK5ARG to check the audio of my truSDX from Sydney (1176 km away!). I had a self-built microphone set and it sounded very well on the 20 metre band. By the way, if I tested it on my home radio it did not sound as well as on the long distance KiwiSDR.
@@cmoser54 thx for that information. So it seems like over distance the voice gets "nicer". I can confirm that. Tested my own transmition with an webSDR and it sounded better...or lets say I couldn't hear these distortions or crackings in the sound.
3:55 The mic's getting overdriven - it CAN sound better, I've managed to get almost "normal" voice out of it fiddling with the mic gain, noise level, and listening to a nearby SDR webchannel. The most common mistake is putting the mouth next to the mic holes, and talking too loudly! It works much better at arms length with a normal speaking voice.
thx for the advice! I will try!
@@CrazyChekov Hopefully it works a bit. I think some of the tolerances of components might make everyone's box a bit different.
@@SarahC2 I just tried receiving it with a websdr...that sounds better...I have the feeling somehow the distance makes the audio sound better. Do you tried recording it with a second radio close to you?
@@CrazyChekov I originally tried with an ATS 20+ little radio receiver (I don't have an expensive HR rig) , and all I was getting was crackling crisp packets with it. I unplugged the radio antenna, and surprisingly that didn't help! I guess the PCB was acting as an antenna and screwing up all the audio.
thx for your comment !
i really tried a lot. made all the filter adjustments and measured them...maybe you can share your settings or what you have done. It sounds better when the receiving signal gets weak.
...but like I said...even with that bad sounding SSB....this is a game changer.
the built in speaker has always been poor quality. in videos where they use and external speaker it sounds much better.
Excellent!
I think you have to change the pa bias settings, I have build before the usdx 1.02 version by WB2CBA, and it improved allot to twiggle this settings.
Thx I tried...also used a different Mosfet. You can get it a bit better dialed in I guess than I showed in the video.....but its really tricky imho.
I think you need to feed your mic input with a 2-tone audio signal and play with all of the adjustments available on the (tr)uSDX while watching the RF output signal on an o'scope until you have cleaned up the SSB audio. Mine sounds much better than yours does and I've done nothing except tune the SSB audio signal path for lowest distortion. These rigs are the price they are because they lack all sorts of circuitry to make everything work optimally out of the box. With a simple rig like this a ham needs to do the work of optimizing it's signals, both audio and RF. In addition to hardware tuning adjustments to optimize transmit efficiency and harmonic filtration, there are more adjustments to be found in the software menus. At a guess I'd say your output FET's aren't properly biased for linearity.
Manuel's tuning video on TH-cam for the Xmitter output stage is very informative but doesn't explain everything about the optimization of other aspects of optimizing the rigs.
Note that a class E amplifier gets its efficiency by being a resonant circuit at the transmitting frequency, so only a single frequency can actually be tuned for maximum efficiency on a given band, with efficiency dropping off at frequencies above and below it. It's a good idea therefor to decide on a center frequency in a given band you want to use, and tune up that band on that frequency. I'm getting between 85 and 93% efficiency depending on the band. Good luck.
Knitting experience needed! Very good😂
ha 😁
The trusdx is able to provide Audio via the usb port. This should make your Digital Mode Use very easy.
thx! I heard about it but never tried it. I read something about max. cable length and that it can make troubles.. ...maybe I will still try it out.
Interesting. My truSDX audio isn't crackly like that. Dont get me wrong, its not great, but not that bad.
May I ask you how do you checked the audio? was it through some webSDR or do you received it also with a second radio?
@@CrazyChekov We did it with a second radio. NVIS about 100 miles apart. I was on the truSDX radio so I didn't hear it but my buddy didn't said he could hear me just fine. Sorry, not very scientific, just a data point. :)
@@CrazyChekov I used the KiwiSDR VK5ARG to check the audio of my truSDX from Sydney (1176 km away!). I had a self-built microphone set and it sounded very well on the 20 metre band. By the way, if I tested it on my home radio it did not sound as well as on the long distance KiwiSDR.
@@cmoser54 thx for that information. So it seems like over distance the voice gets "nicer". I can confirm that. Tested my own transmition with an webSDR and it sounded better...or lets say I couldn't hear these distortions or crackings in the sound.
👍👍
clever but not user fr[endly and not yet a game changer