[time-nuts] 75Z vs 50Z for GPS receivers

Daun Yeagley daun at yeagley.net
Mon Jan 29 03:43:34 UTC 2007


A number of vector network analyzers have a time domain function in them.  They
use an inverse Fourier transform to get the display.
This is VERY useful in a high RF environment.  A number of years ago we had a
problem on a receiver site for the DARA (Dayton) two meter repeater, and it was
located on the WHIO TV transmitter tower.  One of the guys had tried to use a
conventional TDR, but since the front end is wide open, all he could get was
gibberish.  I took an HP 8753 analyzer that had the time domain option, and it
clearly showed where the fault was.  It was able to do it because it uses a
narrowband receiver. 

Daun 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Of Brooke Clarke
Sent: Sunday, January 28, 2007 10:35 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 75Z vs 50Z for GPS receivers

Hi Didier:

Yes they are on eBay.  The tunnel diode models have a narrower pulse 
than the later models that use something more rugged.  Probably for all 
practical purposes one of the newer ones would work well and last 
better.  I think the military bought boat loads of these and I've heard 
from a number of people that use them and like them a lot.

Have Fun,

Brooke Clarke

w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com



Didier Juges wrote:

>Going over the spec for the 1502, it seems like a nice instrument. I am 
>worried about the fragility of the tunnel diode though. When my neighbor 
>AD4TK fires up his amplifier, I have measured up to 1W of his signal 
>going down my feedline (on the 80m slopper antenna)...
>
>Are these things on eBay?
>
>Didier KO4BB
>
>Brooke Clarke wrote:
>  
>
>>Hi Didier:
>>
>>The Tek 1502 is great for doing this, especially if you have the 
>>optional strip chart recorder.  It's what it was made to do.
>>http://www.pacificsites.com/~brooke/Tek1502.shtml
>>
>>Have Fun,
>>
>>Brooke Clarke
>>  
>>    
>>
>
>
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