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Re: Limits of the Port Extension on the Cal screen for calibrating at end of cable

 

On Thu, 26 May 2022 at 17:45, Karin Johnson <karinann@...> wrote:
Hello Group:
I have an 8753C and am wondering what the upper limit on cable length would be if I place the cal standards at the end of a cable to do remote measurement of S11.?? In other words I am using SOL, with the cal standards placed at the end of a 100 foot length of RG-213.? Theoretically placing the measurement plane at the end of the cable.? I have already done this and the results seem to be accurate relative to an actual measurement at the that physical place.
I hope I have explained this issue sufficiently.?
Regards,
Karin Johnson??

In addition to the points raised by others, there is another factor to consider. You will need to slow the sweep speed down, below that automatically chosen for you. Otherwise the frequency of the oscillator will have shifted outside the passband of the receiver by the time it gets back to the receiver. This is well documented in one of the HP Application notes.

Dave

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