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Date: Mon, 05 Mar 2007 20:42:45 +0100
From: Wolf DL4YHF <dl4yhf@freenet.de>
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Subject: Re: LF: QAP 500...how to get rid of attenuator on rigs...
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Hi Stewart,

I think on the TS-690 (as well as the TS-850) the RIT affects the 
digital synthesizer. Especially because the current RIT position is 
displayed in decimal numeric form on the display. The A/D converter 
won't be very impressed by a higher voltage from the RIT pot ;-)

But in the meantime, I built a small active antenna with a high-Q 
preselector (L/C tank, and FET source follower) which seems to work 
reasonably well. But the indoor QRM is still terrible.

73,
Wolf DL4YHF .

Stewart Bryant schrieb:
>
>
> MIKE REID wrote:
>> Wolf,
>> Try setting the rig to 499.99kc and use the RIT to go up into the 
>> 501kc band. No more attenuator!!! That�s what we do on 505-510kc here 
>> in the US.
>>
>>
>
> Is the RIT control a stable input to the frequency synthesizer?
>
> In some rigs it is a pot either directly driving an oscillator, or it
> is an ADC on the control processor where it is used as a poor mans
> digital input.
>
> RIT was originally intended to provide SSB offset, not the 1Hz class
> stability that is needed for QRSS.
>
> 73
>
> Stewart G3YSX
>
>
>