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Re: LF: QAP 500...how to get rid of attenuator on rigs...

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Subject: Re: LF: QAP 500...how to get rid of attenuator on rigs...
From: Wolf DL4YHF <[email protected]>
Date: Mon, 05 Mar 2007 20:42:45 +0100
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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






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