[Elecraft] Filters for K3

[Joe Subich, W4TV]

> Originally, IF shift was defined as moving one IF passband 
> within another IF passband, making the resulting passband the 
> intersection (not the union) of the two passbands.

Again, you are incorrect.  Drake implemented a shift control long 
before any of the Japanese imports and its shift moved the entire 
passband without changing the width.  Width was controlled 
separately, in discrete steps.  

Many of Yaesu's transceivers ... going back to the 1970's ... 
also had independent shift and width controls.  Even today 
the FT-1000D, FT-1000MP, Mark V, FT-2000, FT-9000, etc. have 
width and shift controls that are independent and behave 
exactly like the K3 in Width/shift mode.  

It was only when Kenwood eliminated the third filter and 
failed to link the mixers that shift/width became effectively 
a high cut or low cut filter.  

Like so many other features of the radio, what you prefer 
depends on what you first used.  For me, the current Elecraft 
design is the right way to do shift and width.  Even better, 
I can select independent shift and width for CW and digital 
operation or high/low cut for SSB operation at the press of 
the encoder (or if I select 10 Hz steps for shift the behavior  
can change automatically as I change between voice and CW/data 
modes). 

73, 

   ... Joe, W4TV 
  



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Al Lorona
> Sent: Tuesday, December 29, 2009 6:18 PM
> To: Elecraft Reflector
> Subject: Re: [Elecraft] Filters for K3
> 
> 
> > It depends entirely on which brand of radio you were using
> > and how the manufacturer implemented IF shift and/or width. 
> 
> Originally, IF shift was defined as moving one IF passband 
> within another IF passband, making the resulting passband the 
> intersection (not the union) of the two passbands.
> 
> When  you do that, you effectively reduce the width *and* the 
> center frequency of the IF passband... it has nothing to do 
> with manufacturers failing to make it work correctly.
> 
> Take two pieces of paper and cut a square in each. Hold them 
> up to a window, and slide one square horizontally across the 
> other one, and note how the width *and* center of the opening 
> shifts left or right. This is what I mean when I say, "IF 
> shift". We might be talking about two different things.
> 
> Regards,
> 
> Al W6LX ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html