[Elecraft] IF shift

[Geoffrey Mackenzie-Kennedy]

Dave and Jeff,

Dave you are right in saying that that both IF Shift and RIT (or even the 
main tuning knob) can be used to move an interfering signal out of the IF 
passband.  The advantage of IF Shift is that the 'beat note' from / of the 
signal you want does not change as you move the interfering signal, but when 
using RIT it will change just as it would when tuning the receiver. This 
means that if RIT is used to get rid of the interfering signal the audio 
beat note from the wanted signal could change enough to make it necessary to 
bypass any narrow audio filter used for CW reception, assuming that the 
receiver does not have a BFO whose frequency can be changed using a front 
panel control to maintain the beat note at a fixed value.

The required circuitry for IF Shift exists within the K2, but I imagine that 
the required changes to the firmware would determine whether or not the 
circuits could be used in this way.

Jeff, I think that an outboard S meter would be quite feasible if the K2's 
AGC does not drift.

73,

Geoff
GM4ESD



 ----- Original Message ----- 
From: "dave" <hottell at gulftel.com>
To: <elecraft at mailman.qth.net>
Sent: Thursday, February 08, 2007 12:07 AM
Subject: Re: [Elecraft] IF shift


>
> What is the point of IF shift?  What purpose does it serve?
>
> Can't you do the same thing (or nearly so) with RIT?
>
> My understanding of IF shift is that it allows you to move an interfering 
> signal to the edge of the passband and attenuate it by doing so.  Seems 
> that nearly the same result can be achieved with RIT.  Please correct me 
> if I'm wrong on this.
>
> 73 de dave
> ab9ca