Posted by
Alan Bloom-2 on
Sep 22, 2009; 4:03am
URL: http://elecraft.85.s1.nabble.com/K3-IF-output-buffer-gain-modification-tp3690284p3690375.html
On Mon, 2009-09-21 at 22:15 -0400, James Sarte wrote:
> I've just gone through the last 800 or so recent reflector messages (I
> haven't downloaded my email in a few days), and not a single one was devoted
> to this hardware modification. I have a couple of questions:
>
>
>
> 1. What is this mod for? I'm assuming it's for the Elecraft panadaptor,
> but why do we need to mod the K3? Couldn't the IF output be amplified by
> the panadaptor?
It's a noise figure issue. Amplifying the IF output can only do so much
to improve the NF. (At some point you're just amplifying the noise.)
That said, the P3 should work pretty well even without the IF out mod to
the K3. Normal band noise is high enough that in most cases you should
be able to see pretty much anything you can hear.
> I'm not really comfortable cutting stuff out of my 4
> thousand dollar investment.
It's an easy mod. Just remove one surface-mount resistor (cut it in
half with side cutters and then clean the pads with a soldering iron)
and solder in either a replacement SMT part or a leaded part using a
handy nearby via hole in the PC board. Details are at:
http://www.elecraft.com/K3/k3_app_notes.htmAlan N1AL
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