[ARC5] Scott receiver

[Kenneth G. Gordon]

On 2 Nov 2017 at 16:14, Christopher Bowne wrote:

> If you think the mixer hetrodyne oscillator is stable, and the BFO is the culprit, try injecting an 
> external BFO signal from a good quality signal generator or synthesizer.  That way you can take 
> advantage of the observed better sensitivity of the command receiver.  I currently use a Rockland 
> 5100 synthesizer as a BFO for my Scott SLR-M not because of a stability issue, but because of 
> the very low BFO injection level of the Scott's internal BFO.

I think you are one of the very first folks I have ever heard of who are actually USING a 
Scott receiver. 

I have two RCH receivers. 

These are actually the Scott SLR-F. The RCH/SRL-F covers 80 to 560 kHz, and 1.9 to 24 
MHz, skipping the BC band.

I had one when I was much younger and really liked its stability, excellent sound quality, 
and ease of tuning (it has a big flywheel on the tuning mechanism), but it wasn't particularly 
selective. I didn't think too much of the detector either: it was a 6H6.

One of the two I own now is very deaf. I suspect one of the bathtub capacitors in the RF 
amp section is shorted, but have not yet tracked that down. This one also has a 
replacement IF transformer, although that replacement is obviously from another Scott 
receiver. Even so, the receiver will need a lot of TLC before I can install it in the rack and 
fire it up. It is also missing some of its internal shielding. I think the previous owner was 
trying to track the "deafness" down and gave up.

I have not so much as looked at the other one so far.

Thank you for mentioning your Scott.

Ken W7EKB

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