[time-nuts] 10514B mixer terminations for DMTD

Bob Camp lists at rtty.us
Mon Sep 10 16:21:16 UTC 2012


Hi

I'd agree with all but the "network of caps and resistors" part. 

The R/C termination stuff comes from the original NIST DMTD paper. When
asked about it when the presentation, the reply was: "That's what you get
when you put a statistician in charge of an RF project." 

The R/C termination isn't a major problem, but a more conventional R/L/C
termination works slightly better. That of course *assumes* that you have
good coils that don't self resonate someplace in-band. It also assumes that
it is an R/L/C so that you do not have any nasty peaks in the transfer
function.  

Bob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of cdelect at juno.com
Sent: Monday, September 10, 2012 11:34 AM
To: time-nuts at febo.com
Subject: [time-nuts] 10514B mixer terminations for DMTD

Hi,

For DMTD work 50 ohms is usually not optimum. In the NBS design they used
an effective 500 Ohms.

You want to optimize for the highest amplitude. (Generally)

A network of capacitor(s) and resistor(s) is usually the best way to
terminate.

Corby
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