[Elecraft] Another question about L34 adjustment IF Amp.

2007-06-28 Thread Gary D Krause 
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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Re: [Elecraft] Another question about L34 adjustment IF Amp.

2007-06-28 Thread Don Wilhelm 

Gary,

That is correct, CAL S Lo and CAL S Hi may have to be adjusted a small 
amount, but no other adjustments should be necessary.


73,
Don W3FPR

Gary D Krause wrote:



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?

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Re: [Elecraft] Another question about L34 adjustment IF Amp.

2007-06-28 Thread Tom Hammond 

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 HammondN0SS


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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