Funny FM radio behavior - probably not only UH-1H?

[virgo47]

Recently I noticed a funny behavior of an FM radio in Gazelle (don't let the preview fool you, it's not about Mission Editor):

I was quite surprised to discover - totally randomly really - very similar behavior in UH-1H, which let me think it's perhaps not module-specific.

What I see in both cases is "two-stage behavior":

1. the transmission stays noisy, whatever I do...
2. and then, after something changes... the transmission is quiet, but I can bring it back noisy - and then make it clean!

The set of switches is different in both helos, but the behavior doesn't seem to make any sense at all. Let's see the video:

Notice how just changing the frequency makes the radio NOT working - but it's recoverable through the "noisy" squelch position - and suddenly, one can only have clean sound as well. Any meddling with the frequency selector "breaks" it again until you recover it with the procedure again. I don't think any radio works like that - especially considering, that at first I merely tuned 47Mhz and it started receiving something (although with noise).

The trackfile and mission are attached.

uh1h-funny-fm.trk uh1h-fm-radio-problems.miz