[Premium-Rx] Racal 6790/GM

[Edward Knobloch]

Hello, Gordon

The tuning rate behavior you noted is correct:
"fast" rate is 1 KHz per step, "slow" rate is 30 Hz per step,
and "no rate displayed" is 1 Hz per step.

My receiver also was unable to be silenced with the AF gain control.
(the pot wiper when at the end stop was not at "zero" Ohms).
I replaced the (really cheap) original pot with a 10K audio taper Allen 
Bradley
with good luck. I noticed in mine that someone had replaced
the rf choke near the pot (which is banded like a resistor) with a resistor.

I've seen the mil spec remote control connector for the Racal go for 
around $40
on eBay.

Best regards,
Ed Knobloch K4PF


Gordon & Lois Duff wrote:

> I recently purchased a 6790. It appears to have two problems:
>
>    1. The slow and medium tuning speeds are interchanged. That is when
>       “slow” is displayed it tunes at the intermediate rate and when
>       no speed is displayed it tunes at the slow rate; “fast” is fast.
>       The previous owner was unaware of this as he used a computer to
>       control the radio. Is there a way to correct this and is it a
>       symptom of something else?
>
>    2. The AF control will not completely quiet the audio. Is this
>       normal? What is the fix?
>
> Regarding computer control, is there a source for the 26 pin Mil 
> connector?
>
> Gordon, KA2NLM
>
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