[time-nuts] Rb as source for ADEV?

Jimmy Burrell jimmydburr at gmail.com
Sat Feb 8 06:02:28 EST 2014


Somewhat like Bob (Stewart) I've spent my life in IT with a little background in Ham Radio. Now, infected with the Time Bug, I'm slogging through tf.nist.gov, wenzel, and leapsecond to try and level up.

I'd like to ask Bob (Camp) if he has a readily available link for a suitably quite homebrew mixer, similar to the one whose parts list he was discussing?

Thanks to Magnus for his links (later in this thread), to which I'd like to add the following for those on the list, like me, who are neophytes.

Fundamentals of Time and Frequency: http://tf.nist.gov/general/pdf/1498.pdf

Using a Time Interval Counter to Measure Frequency Stability: http://ipnpr.jpl.nasa.gov/progress_report/42-90/90S.PDF 

The later link, while a little dated, still does a good job of covering concepts.

Thanks again,

Jimmy...
N5SPE

> On Feb 6, 2014, at 8:57 PM, Bob Stewart <bob at evoria.net> wrote:
> 
> I think I see the problem.  I was wondering about using the 1PPS output from my Rb in a test.  Cobbling all that together would be a quick bit of work for you, but I spent my life in IT.  I'm good with a soldering iron, but I readily admit my shortcomings at hardware tinkering.
> 
> 
> Bob
> 
> 
> 
> 
>> ________________________________
>> From: Bob Camp <lists at rtty.us>
>> To: Tom Van Baak <tvb at leapsecond.com>; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>> Sent: Thursday, February 6, 2014 7:43 PM
>> Subject: Re: [time-nuts] Rb as source for ADEV?
>> 
>> 
>> Hi
>> 
>> My intent was certainly not to stop anybody from doing anything with what they have. My concern is that this is a lot of work for modest return. A simple single mixer setup for  $20 would dramatically change things….
>> 
>> $3 mini circuits double balanced mixer
>> $3 op amps x 2
>> +/- 15 V supply you already have (hopefully).
>> $5 for a piece of perf board
>> $3 for 3 BNC connectors. 
>> $3 left over for resistors and capacitors. 
>> <snip>
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