[GreenKeys] Hal ST-6 using it in modern times

[Ralph Irish]

Hi Gang 

Back when the Signal One CX-7 transceiver was new, it was one of the first to have an FSK position on the 
Mode switch. It turned out, though, that although it was 'true FSK' they had the shift backwards. Prior to 
the CX-7, maybe only Central Electronics had FSK available, with the 100V and 200V models. Don't know 
how that one worked as far as 'frontwards/backwards'. They might have had a reversing switch for this, but I 
don't know. I've only seen them on swap tables. 

I suspect that most who used RTTY with the CX-7 did it with AFSK and had to use the 'low tones' due to 
the filtering in the i.f. and other circuitry. 

73, 

Ralph - W8ROI 

- - - - - - - - 

From: "Jim Haynes" <jhhaynes at earthlink.net> 
To: "Jeffrey Golas" <jeffg at junknet.net> 
Cc: greenkeys at mailman.qth.net 
Sent: Sunday, March 22, 2020 9:42:39 AM 
Subject: Re: [GreenKeys] Hal ST-6 using it in modern times 

On Sat, 21 Mar 2020, Jeffrey Golas wrote: 

> 1. I didnt realize RTTY uses LSB, even on 20 meters. 
> 
That's merely a convention, from the early days, before SSB. Most 
demodulators have a reversing switch in case the tones are reversed from 
what they might be. With DSP demodulators we started out with LSB being 
normal for RTTY, but USB was expected for all the other modes, so the 
reversing switch was changed to make USB normal for all modes on all 
bands. 

Jim W6JVE 
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