[Elecraft] K2 AGC problem

[Sjoerd]

Hello all,

Just some added info abt my K2's problem.

Measured Vagc at pin 5 of the IF amp:

-No antenna connected AGC on:		3.83V
-no antenna connected AGC off: 	3.82V
-40m antenna connected: 		3.90V (my FT-1000D shows abt S5
noise)
-XG2 connected : 				3.99V (50uV level, should be
S9)

Found a post from N6IZ in 2004 that stated that Vagc varies about 100mV per
10dB. (
http://ac6rm.net/mailarchive/html/elecraft-list/2004-10/msg00085.html ) In
my case that says my S9 level is only about 16 dB above noise level...

Is there anyone who measured Valc at some point and can tell me if these
values are way off?

Thanks again,

Sjoerd
PE2SVN

-----Oorspronkelijk bericht-----
Van: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] Namens Sjoerd
Verzonden: dinsdag 29 augustus 2006 22:56
Aan: elecraft at mailman.qth.net
Onderwerp: [Elecraft] K2 AGC problem

Hello all,

While operating my K2 and switching between bands a lot i noticed my AGC is
a bit strange.

When trying to set the AGC treshold following Don FPR's instructions i find
that the noise level is not changing with the AGC treshold pot with both
preamp on and off. There is a difference in noise level between preamp on or
off but there  not enough noise to trigger the AGC, even with preamp on.
Could this be a lack of gain in the receiver or is the ALC circuit wrong?
S-meter seems OK to me and the S-meter readings do change with the ALC
treshold.

Hope to get this nice toy even better..

73,

Sjoerd,

PE2SVN

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