Re: Noisy K-3 Receiver
Posted by
G3TCT on
Dec 17, 2009; 8:59pm
URL: http://elecraft.85.s1.nabble.com/Noisy-K-3-Receiver-tp4173832p4183443.html
OK Don, well it must be controlling the gain of the first IF amp then, and
that must be important to the receiver's noise figure. All I know is that
turning down the RF gain reduces S/N (on my K3 at least). And this wasn't
the case in f/w 3.27.
Graham
----- Original Message -----
From: "Don Wilhelm" <
[hidden email]>
To: "Graham Kimbell (G3TCT)" <
[hidden email]>
Cc: "Elecraft reflector" <
[hidden email]>
Sent: Thursday, December 17, 2009 6:36 PM
Subject: Re: [Elecraft] Noisy K-3 Receiver
> Graham,
>
> BUT - the K3 "RF Gain" control ONLY controls the IF gain - it does not
> reduce the gain of the receiver front end - in that respect, the K3 is
> similar to those other receivers that you referred to.. The preamp and
> attenuator DO change the front end gain.
>
> 73,
> Don W3FPR
>
> Graham Kimbell (G3TCT) wrote:
> > This is a major irritation that has only surfaced with recent firmware
> > changes - the problem wasn't there in f/w 3.27. Other receivers I've
used
> > keep the S/N constant with the rf gain backed off presumably because
they
> > are reducing the IF gain further back in the rx.
> >
> >
> >
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