Yes some converter/chargers are quite noisy on the HF bands. The newer ones are switching supplies and they just generate noise so even if you wire direct to the battery the noise will still be there. I replaced the original one in my TT and in my case if it's off the only thing it will effect is the charger so it's on it's own breaker. I run a pair of batteries so I can ham it up for a good while before I need to recharge. You'll have fun with mobile HF I really enjoy the one in the truck and when I'm parked it gets switched to the TT.
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