[Elecraft] Filters for K3

[Merv Schweigert]

Drake??   What about Collins and the 75A4 that had a fine shift
control on the front panel,  done mechanically/electrically but was
well before Drake had a radio.. Width was controlled by filters.
Merv KH7C

>> 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 ______________________________________________________________
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>
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