[ARC5] Drift in BC-453 - more

[Kenneth G. Gordon]

On 13 Dec 2017 at 14:03, AKLDGUY . wrote:

> The problem is more than just stability averaged over a second or two.

Well with some versions of JTXX and WSPR, we need stability averaged over at least a 
couple of MINUTES, not seconds.

> That's not hard to achieve in a Command set. The big problem is phase
> jitter, a shift for a few milliseconds and then a correction in the
> opposite direction that all averages out over a second or two. Noise
> is the cause and the 12SK7 and 12K8 are notorious offenders. 
> 
> Neil ZL1ANM

6/12K8 is the absolutely noisest "converter" tube in Terman's entire long list. I hate the thing 
for that, but it does work well enough in the "ARC-5" receivers....

Ken W7EKB 



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