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I suppose I could mostly agree with that, though a 20 mhz analog scope should be good enough to diagnose this problem. I assume his transmitter is running at 14 mhz. If you want to check signal shapes

I would be real suspicious of T1 or T2 not phased right if the problem is in the pa. Also, a mike input of 25-50 mv's is plenty. With 25-50 mv's into the mike jack you should get 1 volt or so at the

This video is from an older version 3 linear https://www.youtube.com/watch?v=xq_yfgYRH2Q ( https://www.youtube.com/watch?v=xq_yfgYRH2Q ) ( https://www.youtube.com/watch?v=xq_yfgYRH2Q ) but it should

Yes, about the audio: I injected a 100mV pk-pk signal at the mic input. The source was Audacity on my PC, decoupled with a capacitor, fed through a 10k pot as a voltage divider, and then applied to

Leonard raises a good point. ?I assume Mark is supplying audio at an appropriate level when measuring power out, and not just measuring residual carrier. ?The standard Raduino firmware should

Yes, could look at the modulation envelope. ?I was concerned that if the max sweep speed was 0.5us/div, the bandwidth would likely be down around 5 MHz. ?But if he really has a 20 mhz scope, then

That is good to hear . I will have to see about sourcing some of these parts and try this with the BITX40v3 that I have modified for 80M . Might improve stability in the BITX80v3. Thanks for info .

I mentioned FLDigi earlier because our ham radio club will be building the Easy Digi board kits as a club project at next month's meeting. If I am already set up for digital modes, seems like that

When testing the modulation envelope the scope sweep speed should be set around 1ms per division so the modulation envelope and not the usb frequency will be displayed. With the scope set at around 1

Yes, the bias of the IRF 510 is set to 50mA per the instructions that came with the kit. I will take a look at the gate's AC & DC voltages tonight. Maybe it is a distortion issue of some sort in the

I noticed with another Nano DDS, I had serial monitor commands being processed in my sketch, even though I didn't have the monitor open. I was getting digital noise and couldn't figure it out where it

Are these the correct sources for the most recent Raduino sketch for the Bitx40 and for the Si5351 library? https://github.com/afarhan/bitx40 https://github.com/etherkit/Si5351Arduino I noticed that

Thanks, I’ll try that. I wasn’t really referring to the “tuning tick”, but if your mod eliminates that, I’m sure it will take care of my other problem too. I suspected the noise was getting

2v pk-pk sounds about right to me, though I don't really know. Output pk-pk voltage should be about the same with or without the filter and that seems to be pretty much the case, you have trouble

I forgot mention I use a bourns 100K, it is preferable over a 10K. More steps due to smaller wire gauge in the wire wound pots! -------- I am very pleased with myself!! got the drift down to +-20Hz,

I am very pleased with myself!! got the drift down to +-20Hz, even blowing on the board changes it by 50Hz momentarily. Changed C91-96 with C0G/NP0 SMD's and it was almost perfect! Choose 5% types. I

Try 10nf + 100nf + 1μf + 10 - 22μF on both input and output of the voltage regulator with the shortest possible leads to earth (centre pin of the regulator). High value electrolytics have too much

hello i put a large 25v 30000 mfd across 12volt supply ?it ?removed most of the noise but not the DDS TICK

I was able to silence the tuning "tick" by inserting a 22 ohm, 2 watt resistor in series with the Raduino power wire and connnecting a 470 uF capacitor from each end of the resistor to ground (One

The exciter board is producing 2v pk-pk. I do have a scope. The fastest it will scan is 0.5uS/div, so it is very hard to get a good picture of the waveform. But amplitude is pushing 2v pk-pk. I just