[time-nuts] 75Z vs 50Z for GPS receivers
Didier Juges
didier at cox.net
Sun Jan 28 22:57:21 EST 2007
Certainly a vector network analyzer is the next piece of test equipment
I need to get. We have several HP 8720 and 8722 where I work, and it's
easy to be spoiled...
Unfortunately, that's another quantum leap in cost from the spectrum
analyzers and synthesizers I have, at least for those that are microwave
capable.
I remember a long time ago doing the reverse, taking a TDR plot (or data
set) and computing the frequency domain response using FFT.
Did I say that was A LONG time ago?
Didier
Daun Yeagley wrote:
> 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
>
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