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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.

I mean the output levels at each stage between the PA and the first mixer and the levels at each LO (CLK).

Hi as other have said the output is routed differently up to the first IF, then is the same. When I first did add a 45mhz parallel LC filter just after the first mixer, I got lower output on CW only.

Neither HF amateur is expected to transmit Hi-Fi. I suppose, if managed, it should suite well. Only issue is biassing needed for the mic. You need to flow 10mA into the mic.ll the best for a trial. A

Thanks for the comments. I know (wikipedia hihi) the limitations of carbon types, but I remember old telephones were not hifi but very effective in speech. The carbon type needs dc and maybe the one

Not earpiece but mouthpiece. https://en.wikipedia.org/wiki/Carbon_microphone [email protected]> wrote: