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Plese make me feel welcome to feel, it is not the end of the line. You have been on line (active) long enough, since my last posting(to respond)..
Regards,
xanadunow
Please post another ducks quacking WAV file for the end of 2008.
I found a good one but I can't attach it here.
I watched a recent TV show about UFO's. They had airline pilots quacking with severely narrow audio bandwidth. Nobody could understand what they were saying and they had to repeat everything many times.
It does really sound like Xmas - everywhere around![]()
Now your getting it. And yes they do use SSB. I did have a quack before I regulated the oscillators. Even now a very strong signal can cause it. It is from loading which might cause the oscillator to shift, either the BFO or even one or both LOs because they must maintain a particular offset to sound perfect. So even if you use PLL and the BFO is free running, excessive loading from say the audio, will cause the "quack"...lol. But hey, you should love it. You would think if anybody could understand it, it would be Scrooge McDuck.
Your LO's should be isolated from audio. There should not be loading unless your improperly isolated.
I still have 24 hours to enjoy the last of 2008.
Then tomorrow night I celebrate 2009.
Mike Mike...Your not thinking. I will run cover for you here. If the power to drive the audio is excessive, then you might get a slight dip in the voltage at the onset.
My thinking is just fine. Your 1N914 unbalanced diode mixer is completely mismatched on every port. You neglected Z-matching in your design. Your IF out to your crystal has no Z matching whatsoever. Your LO port is driven by a 1K resistor with no isolation buffer in between. Has the concept of 50Ω matching completely escaped you? If your audio is sagging your supply, then your supply is underegulated or just lacks regulation altogether. No cover needed on my end.
Why do I need 50 ohms? Am I matching it to antenna or something? I look for results with simplicity.
It doesn't have to be 50 ohms, but that's the usual standard, you can match at any impedance you like - but finding 145 ohm coax cable can be difficult?![]()
And there you have it. I was gonna mention coax. In that part of the circuit there is no coax. All I want out of the balanced modulator is great carrier suppression and good voice. I got that so what's the problem?