Had some bizarre issues with my SRC A1 today. SMDWB was the transmitter. Happened at two different locations (15min drive apart). Crew had no walkies.
I had very poor range, even though the selected frequency had no activity at all. 15ft or more away and I'd get the standard RF hiss/hits. By comparison, I had another talent on a Block 21 SMQV with no issues (on a frequency that WASN'T 100% clear).
I was also getting these very strange sounding buzzing/whining noises that would get louder around dialogue, doesn't sound like regular RF issues. Example attached. 10DDT03_4.wav
I changed frequency, to another block in fact, didn't solve either issue. I had to pull the SMDWB and switch to a Block 21 SMQV/SRB combo.
Not sure if the problem is the SRC or the SMDWB, will do more tests tomorrow.