Since starting to receive ADS-B signals on 1090MHz I was wondering how well my home made antenna was tuned to that frequency.
I spotted an analyser for AU$236 that covers up to 2.7GHz on Aliexpress here and it seemed worth a try. Here it is with a simple dipole that is reasonably tuned to 1090MHz.
It's advertised as "Antenna Analyzer N1201SA SWR standing-wave meter Talent instrument Impedance tester 140M~2.7GHz" and I'm very happy with it.
The unit contains a re-chargeable battery and is simply re-charged with a USB cable. The knob at the top makes it easy to tune the lower and upper range frequencies.
Output level is -18dBm and it seems on frequency as far as my UHF transceiver is concerned.
There are two modes, one with figures displayed and the other which draws a graph as you see above.
If you need to work in the GHz range, I recommend this little analyser. It turned out my home built antenna for 1090 was a little low and resonant at 1083.3 - not too far off.