Hi Gary:
There's a tuning point, just below the point on L34 where you DO
achieve max. received signal, where the background noise will drop
off faster than the received signal. It's (if I recall) about 1/2 to
1 full turn DOWN from the point of max RX sig.
If you have Spectrogram installed, you can actually see it on the
spectral display... it's NOT a terribly dramatic effect, but it is
observable... you WILL lose a bit of received signal strength, BUT
it's more than compensated for by the fact that the signal-to-noise
ratio has been improved, so to signal seems to 'stand out' a bit
better, even though it may be a couple dB lower in level.
73,
Tom Hammond N0SS
At 10:33 06/28/2007, Gary D Krause wrote:
After reading another post about adjusting L34 for the IF amplifier,
I have another question. I've wondered about this since completing
my K2. The manual was a bit confusing and from what I can remember,
it said to adjust L34 for the strongest signal and lowest background
noise. It also said that a DMM could be used across the speaker
output to get a more accurate reading. Well, my question at the
time was how can you get the strongest signal and lowest background
noise with only one adjustment. So, I figured it would be a
compromise between the two. I adjusted L34 but, not exactly to it's
highest volume or loudest signal.
Now I've learned that it should be adjusted for the loudest signal
and that includes the background noise. So, can I now go back and
readjust L34 for maximum volume and if so what else will I have to
align? I assume that I would only have to re-calibrate the
bar-graph, is that correct?
Thanks,
Gary, N7HTS
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