[time-nuts] HP10514B Mixers

[Mike Feher]

Bob -

At the time I was more interested in DC balance and not noise. The op-amp in
our application provided adequate isolation. For our application at the time
they worked great. Regards - Mike

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960




-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bob Camp
Sent: Tuesday, March 30, 2010 9:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP10514B Mixers

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
> 
> 
> 
> 
> 
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