[time-nuts] External clock for Analog to Digital Converter inGPS Rx front-end

[Arnold Tibus]

Hi,
HP was using in their 500MHz counter 5345A a noise generator 
(zener diode with amplifier on PC board 'A8 PLL Multiplier Noise Generator 
board') to modulate via a varactor and a tank circuit the 10 MHz 
reference frequency coming from the ocxo 10811A. 
"4-126, As the erratic changes in noise affect CR12's capacitance, the 
phase of the 10 MHz signal shifts rapidly. The result ia a 500 MHz time base 
signal that is phase modulated so rapidly and erratically that it cannot be 
harmonically related to any input signal."
Intersting technique, easy to follow.
Is that what was searched, would such a circuit help? 
The manual is freely available via the net as .pdf. 
Perhaps that board, cannibalized from an old counter, could be used...
I think it is necessary for TIC to get statistically correct intermediate 
counts.

cheers,
Arnold, DK2WT


On Sat, 3 Mar 2007 10:31:13 +1100, Bilal Amin wrote:

>Yes, I am looking for a phase jitter. In other words I need my sampling 
>instants to vary randomly at each sampling interval.

>Bilal
>----- Original Message ----- 
>From: "John Miles" <jmiles at pop.net>
>To: "Discussion of precise time and frequency measurement" 
><time-nuts at febo.com>
>Sent: Saturday, March 03, 2007 10:25 AM
>Subject: Re: [time-nuts] External clock for Analog to Digital Converter 
>inGPS Rx front-end


>>
>>> You can easily add noise to a sinewave, for example a hybrid combiner
>>> can be used to combine the output of a sinewave generator and a noise
>>> source.
>>
>> That's just going to create AM noise, isn't it?  He wants jitter (phase
>> modulation), I believe.
>>
>> -- john, KE5FX
>>
>>
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