[Elecraft] IF shift

[Fred Jensen]

dave wrote:
> 
> 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

Timing is everything, I just logged on and there was your question.  IF 
shift [a la the TS830] moves the signals in the passband but does not 
change their pitch.  RIT moves them, but their pitch changes.  I sold my 
TS830 with IF shift, and I do miss it on the TS850 and K2 [although the 
K2 filters are so good, they tend to make up for it a little].  IF Shift 
[aka passband tuning from the Collins days] is cool on CW, and fantastic 
on RTTY.  Art Collins achieved it in the 75A4 by actually rotating the 
entire PTO assembly to keep the received pitch the same.  Now days it's 
done with magic.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2007 CQP Oct 6-7
- www.cqp.org