This reminded me of something. Sometimes while listening to your own
signal (CW) in your shack you may notice some hum. This may not be real.
What happens (QRP Guys notice this a lot when using direct conversion
receivers) is a lot of the signal in the shack may be radiated by the power
lines or other wires and not the actual feed line or antenna. And this RF
may be modulated by the switching on and off of the rectifier diodes in
various power supplies thus it will modulate the Carrier that you receive
in the shack. The solution is to put RF bypass capacitors across the
rectifier diodes or don't worry about it.
73
Bill wa4lav
At 11:36 PM 4/25/2004 -0400, jeff millar wrote:
If Voltage across the filament caused bias/linearity/gain variation
problems, then all amplifiers with AC on their filaments would have hum on
the transmitted signal.
60 Hz on the filament varies very slowly compared to RF...its almost
DC...so DC doesn't hurt...except for hypothetical wearout issues.
jeff, wa1hco
Steven Grant, W4IIV wrote:
thanks for the tip...your correct...wouldnt using DC cause a bias
condition that may cause linearity problems?.......steven
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