Antenna Coupling measurement in a noisy environment.

[skymaster]

Hi all,
I've to measure the mutual coupling among two antennas in FM broadcast band with a network analyzer. How can I get rid of the signals coming from the repeater and consider only the signals coming from PNA?
thaks sky

 

[vfone]

Use an RF shielded chamber or enclosure.

**broken link removed**
**broken link removed**

 

[skymaster]

Thanks but this is not possible since it is already installed.
I was thinking:
1)Increase the power of the signal coming from pna to put the external signal in the noise floor
2)measure outside left and right not occupied frequencies and then interpolate

something better?

 

[jiripolivka]

Your problem reminds me mine. Measuring antennas in a crowded FM broadcast band may be impossible.
You could try to find an "empty" channel and take the measurements there. If no channel is left for it, then you have to move off the FM band.
You can try scaling, try to use twice the FM band frequency: at 200 MHz there may be no interference.
My problem was even worse; I wanted to record solar radio noise. I can hear it but cannot make a record, due to interference
Good luck!