Re: How to safely look at transmitter output with a spectrum analyzer


"Jim Stewart"

I'm interested in checking the outputs
of VHF and UHF transmitters for harmonics.

Power levels of 1 to 50 watts. What's
the safest way to look at the output and
still make an accurate measurement?


** An "accurate measurement " of what - exactly ?

If you want to know if a given Tx is radiating harmonic energy that could
cause interference to a receiver operating on that harmonic frequency -
then you had better set up the Tx * with its intended antenna system* and
then search for harmonics via ( calibrated) receiving antenna fitted to the
analyser.

If you just want to see how the Tx behaves when driving a dummy load, then
you will need a copy of the maker's service and alignment notes - and
follow the procedures set out inside.



....... Phil


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