[Elecraft] Re: K2 receiver problem - AGC alignment, CAL S LO/HI

[Gerhard Schwanz]

OK,

I did it for several modes and there are differences which I will leave for
now. Aimed for 3.65 volts at U2 now. Result seems satisfactory to the ear.

Today in the evening we will use a signal generator and a variable
attenuator to test sensitivities of my K2 and this other one.

If results should not be ok I'll let you now.

Thanks so far for all the help!

Gerhard

----- Original Message -----
From: "Don Wilhelm" <w3fpr at earthlink.net>
To: "Gerhard Schwanz" <gerhardschwanz at yahoo.de>; <Elecraft at mailman.qth.net>
Cc: <w3fpr at arrl.net>
Sent: Friday, November 11, 2005 12:37 PM
Subject: RE: K2 receiver problem - AGC alignment, CAL S LO/HI


> Gerhardt,
>
> If you still have a difference between AGC on and off at 3.65 volts or
> lower, I would hesitate to go further, but you certainly can try it and
see
> what happens - no real harm will come from a lower threshold voltage.
>
> After setting the threshold, then adjust CAL S LO first and then CAL S HI
> (the order is important, they interact).  It is not unusual to have to do
> these several times in succession to get it correct.  The low S meter
> response may vary with the filter width and mode, so check all modes with
> the widest filter for each mode.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----
> >
> > Hi list,
> > hi all those who answered my first question.
> >
> > I had 4V at Pin5 U2. So I replaced R1 with a pot of 50k and set
> > it to 3.65,
> > 3.72 and 3.8V. It got better for sure. The difference between AGC
> > on and off
> > is in all cases noticable, but slightly. But I think it's significant,
> > because...
> >
> > When I CAL S LO and exit it then immediately 1-2 bars of the s-meter
start
> > lighting. So I guess AGC sets in. And this should not be the
> > case, I guess?
> > Any idea?
> >
> > Have a nice day,
> >
> > Gerhard
> >
> >
>


	

	
		
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