[time-nuts] HP10514B Mixers

[Bob Camp]

Hi

The obvious question is weather you need a real good mixer to make a low noise phase detector. 

Sorting the diodes as you did resulted in a mixer that performed at a specific level. Better matching would have made it have more isolation as a mixer, it might have helped the conversion loss by a fraction of a db. Would it have also done something good for the phase detector characteristics?

If the answer is "not really", then one could pick diodes for low 1/f noise and do a simple match up on them. You might get some pretty good phase detectors real cheap. 

Bob


On Mar 30, 2010, at 8:52 PM, Mike Feher wrote:

> I do not believe that I am familiar with the 10514B. I probably have about 6
> or so 10514As with BNC connectors (most in a metal case and a few in epoxy),
> and, I recall from about 40 years ago a 10514A that was a small little black
> cube with leads for mounting on a PC board. Naturally, I had to take one
> apart back then as that was the fun part. In the late 60's I designed a
> thick-film phase detector that was used in an ASW system, where I simply
> matched the hot carrier HP diodes for a fixed voltage drop at a given
> current. We also wound the toroids, and had an op-amp on the output. Wow,
> that was ages ago. Regards - Mike
> 
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
> 
> 
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>