Proper Spectrum Analyzer settings to match sweep speed to pulsed signal interval
When dropouts are expected in RF telemetry, I find it easier to go on zero span sweep with SA centered so that any drift can be captured in carrier plus modulation BW.  Then using the SA as a scope using very slow sweep to capture say 10 burst events as you find the deadspots in the antennae. Thus 1s/div

Minimize RBW and VBE to optimize SNR on display without errors from Tx drift and SA being too narrow.

For missing bursts, you are only interested in the top 20dB BW and not -60db.