Thanks for the quick reply Don !!!
I guess I will continue then.....I'd decided to stop further
construction until I had an answer. Just in case it was something to be
concerned about.
Gosh....seems like these components just get smaller and smaller....HI HI
73...de...Fred N9TA
_______________________________________________
Don Wilhelm wrote:
> Fred,
>
> It is all relative. If the 8 volt regulator output is on the lower
> side of its spec (it is a 10% tolerance part), then everything will
> work out just fine, set it to the maximum.
> Reason - the IF amplifier is the stage controlled by the AGC, *and* it
> is powered by the 8 volt regulator. When the IF Amp supply voltage is
> reduced, the ACG action begins at a lower voltage point than at higher
> voltages.
>
> Bottom line - if you are able to set the S-meter parameters with the
> lower AGC Threshold voltage, then all is well. If you cannnot adjust
> the S-meter, then a 10k to 15k resistor soldered across pins 3 and 4
> of Control Board RP6 will allow you to adjust the threshold upward.
>
> Yes, a manual errata sheet should be published IMHO. The 3.8 volts is
> not graven in stone. There is an implication in the K2 manual that
> the AGC threshold can be optimized later on, but there are no details
> of how to do that - in fact, that optimization is simply reducing the
> AGC Threshold voltage so that receiver noise does not activate the AGC.
>
> 73,
> Don W3FPR
>
> Fred Bennett N9TA wrote:
>> Hi Gang
>>
>> Construction on my 3rd K2 is coming right along......BUT....I have a
>> question: I'm at page 48 of the manual where I am going through the
>> first power-up checks. I can't get the "AGC Threshold" voltage up to
>> 3.8 Vdc as suggested. My new K2 tops out around 3.62 as measured with
>> a Square D WMM-23 digital multimeter. Is this something I should
>> worry about??
>>
>> 73....de....Fred N9TA K2
>> serial# 6705 under construction
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