Here is what John Kriner, via Bill Frost, has to say on the R-7 AGC alignment,
reprinted with permission:
-----------
Boy, this is a lot to digest. But I'll try to answer the questions as I see
them....
AGC pedestal is left all the way CW. I have argued with some folks who
claim it must be re-adjusted. But this is the way I have always left it. And
the S-meter calibration turns out to be perfect, and S+N/N far exceeds the
specifications. 10dB drop in generator level equals an exact 10dB drop on the
'S' meter.
The TR-7 'S' meter can be adjusted for the same exact readings as the R-7.
The TR-7 requires some additional 'fiddling', but you can achieve the exact
same results without any type of compromise.
The results in the AGC 'F' mode of the R-7 are really normal. I can think
of very few uses for this setting, and maybe someone with the smarts could
change the T C for more acceptable results.
> I think I just "got it": The IF GAIN is being used to establish the AGC
> pedestal! Does that make sense?
Yes, it does.
-----------
Thanks to John for the helpful comments.
73
-Jim
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain 3750, IBM PS/2 - all vintage, all the time!
"Give a man a URL, and he will learn for an hour; teach him to Google, and he
will learn for a lifetime."
HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://incolor.inetnebr.com/jshorney
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