[Elecraft] K2 AGC set

[Don Wilhelm]

Jack,

An 8 volt regulator voltage of 7.96 volts should allow you to set the 
AGC Threshold higher than you reported.  Did you have the RF gain 
control all the way to the clockwise rotation stop?

The voltage at U2 pin 5 is determined simply by a 3 branched resistive 
divider which involves the RF Gain, Control Board R1, and Control Board 
RP6, so you apparently have either a high resistance connection 
somewhere or you have an incorrectly placed resistor (or control pot).
Check All connections to (and values of) R1, RP6, the RF Gain control 
and the connectors between the Control and RF boards as well as the 
connectors between the RF Board and the Front Panel board.

73,
Don W3FPR

Jack wrote:
> 8v regulator output was 7.96v.
>
> Thanks for the input guys. I'll finish the rig then set again.
>
> cheers
> Jack VK2CJC / MM0AXL
> FISTS #9666 - CW QRP Club #753 - Elecraft K2 #6404
> Mid North Coast Amateur Radio Group  www.mncarg.org
> For MSN Messenger, use this emails return address
>
> ----- Original Message ----- From: "Don Wilhelm" <w3fpr at embarqmail.com>
> To: "Jack" <vk2cjc at bigpond.com>
> Cc: <elecraft at mailman.qth.net>
> Sent: Thursday, February 28, 2008 3:16 AM
> Subject: Re: [Elecraft] K2 AGC set
>
>
>> Jack,
>>
>> The cause of the low AGC Threshold is a low output from the 8 volt 
>> regulator (Control Board U4)
>> It will llikely not cause any problem at all if you simply set the 
>> Threshold to max.  You could consider replacing the regulator if it 
>> causes you concern.
>>
>> 73,
>> Don W3FPR
>
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