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Evan, indeed bfo adjustment is a factor, my recent v4 was way off. Maybe this could he in play here. Dave, good work using your diagnostic equipment. I would first he suspicious that the automated

Sheez, Terry, Sorry your world is closing down. Sounds like the song, "Told to work, too young to die." Best wishes. 73 Sent: Saturday, December 22, 2018 at 2:07 AM From: "terry hughes via Groups.Io"

Please understand that I am not an expert on this topic, or board.? I do have a background in Electrical Engineering, so have some training, though not in troubleshooting (other than for industrial

Why I went down this route is due to low signal can barely hear anyone.? So I figured I'd try some tracing.. My understanding is 50uv (volts) should provide an s9 signal.? My signal generator lowest

Ok for the earpiece. If I find one I will tinker with it. I agree that the ubitx sounds ok (a part from tx IMD figures not excessively good) with the condenser type and unlikely it will sound better

OK, I reread your post.? ?I do see that you are before the first mixer testing on the low pass filter (c200-204).? I would assume that it would not be linear at all.? even though you are getting

Better thinking is that the carrier-balanced 1-KHz signal is heard farther back toward the audio section, after the BFO has done its work. Bob — KK5R --------------------------------------------

Dave There is gain distributed rather evenly so not sure you are seeing anything unusual. Unlike a commercial rig with gobs of AGC, this rig requires using the gain control. Please evaluate into a

I also thought that injecting an AM signal is like listening to an AM broadcasting signal where you have to zero-beat the carrier and listen to the modulation. A 'scope would be better to see the

My first thought is that it may be some kind of bandpass filter that is not on-frequency. However, very often the obvious is not the problem in such cases. Signal injection and tracing is the way to

If I am interperting what you are doing correctly, you have an AM signal at 7.15 Mhz with 1 k hz modulation.? You are injecting it starting at the antenna and progressing towards the audio section.?

This is for a ubitx board v4.

Let me start with I'm a noob at diagnostics. Since my signal is really low I started to do some tracing. One thing I noticed is odd if I inject a signal further away from the antenna source it gets

The earpiece in the telephone makes a good dynamic element in a microphone but because the Bitx is designed for an electret microphone and the electret elements are so common, I also consider it a

Don'y bother. I had 40yeasrs of experience in Indian Telecom. I get your point , sir. regards sarma vu3zmv [email protected]> wrote:

The telephone I referred to for using the earpiece is here and note that the device across the earpiece was "shunted to keep from hearing the dialing impulses."

Careful reading will show that I was not talking about the Wiki "Mouthpiece" which is a carbon unit but about the EARPIECE which is an earphone that closely resembles a dynamic microphone element. I

Just check C81 and R83 if they are OK. Also L1,2,3 & 4.

Having sorted through my spares box I have found some SL621C chips (Metal can), after my own build I might have some to spare,whats the going rate for these?

Thanks for that insight I’ll check those areas out and let u know how I go.