[TenTec] cw creation

[Steve N4LQ]

A lot of newer rigs develop their keying in the DSP stage. Event the 
TS-950sdx did that and it's ancient history. If you think about it, shaping 
the envelope just right should be much easier in dsp than trying to key or 
shift the frequency of an RF oscillator.
The Collins 32S-1 transmitter keyed an audio oscillator and fed it into the 
ssb modulator. Unfortunately it had terrible keying and Collins was forced 
(by the FCC) to revert to grid block keying in later models. This gave a bad 
name to audio type keying but now it appears that technology has improved.
As for the Pegasus and Jupiter. The schematic is a mess and I have not seen 
a block diagram so I really can't comment how they are keyed. Both had 
problems with fuzzy or raspy keying at first but this was due to problems in 
the first conversion oscillator and had nothing to do with how it was keyed. 
Most of them I hear nowadays sound much better. Possibly TenTec sneaked some 
firmware changes in that cleaned things up.

Steve Ellington
N4LQ at iglou.com
----- Original Message ----- 
From: "Steve Baron - KB3MM" <SteveBaron at StarLinX.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, May 23, 2006 5:41 PM
Subject: Re: [TenTec] cw creation


>
> ----- Original Message ----- 
> From: "Bob Stephens" <bstephens1 at mindspring.com>
> To: <tentec at contesting.com>
> Sent: Saturday, April 23, 2005 21:20
> Subject: [TenTec] cw creation
>
>
>> Sometime in  the past there was a discussion of how modern rigs such as
> the
>> Orion or Jupiter produce "cw" as opposed to the way classic cw is/was
>> produced in classic rigs. Unfortunately I can't seem to find the thread
>> either through Google or in the Archive.
>>
>> As I understand it, in many modern rigs cw keying is done by injecting an
>> audio tone (onto a ssb signal ?), HUH!?  Who told you that.?
>
> There was a guy at ARRL many years ago that believed than rather than 
> true
> on off carrier keying.
>> This almost sounds a bit like the difference between FSK and AFSK.
>>
>> Could someone on the list help me understand this better, and could
> someone
>> also list which TT rigs produce "cw" which way?
>
> Which rigs you thinking about?  Did you look at schematics?
>
>>
>> tnx
>> Bob, KB1CIW
>>
>>
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