Total posts : 45366
I wasn’t suggesting that you get a ProCaster. Just that I ran into a similar problem with a tuning coil.
Your TH should retune if you change frequencies. It’s been a while since I used one without the ATU (which bypasses the internal tuner) and I can’t remember whether it does so automatically when you change frequency. It will definitely attempt to retune (if it’s working) when you power the transmitter down and then back up, after changing frequencies. If it doesn’t, then that could be the problem.
If the 2nd TH has the same issue, then you should look elsewhere, as it’s unlikely (possible, but unlikely) that both are defective. I always try to get 2 of everything I use, as it makes isolating problems so much easier just by doing a simple swapout.