I'm pretty sure my SoftComm ANR uses power off the panel, or the intercom/radio. It certainly doesn't have a battery box.
Interesting. I looked at their website and they're drawing from the radio's "bias voltage". Same thing that powers the electric microphones common these days.
Yup, that'd kill HT batteries quickly. I bet that thing draws double or more of the current usually required to run a microphone.
Sorry, I didn't know anyone was doing that on their ANR headsets.
It would be interesting to see if it's drawing power from the intercom or the HT. That would be easy to check. In theory, it could be done either way... the intercom could block or pass the HTs bias voltage, and if it blocked it, provide its own for the mics (and apparently ANRs) plugged into it.
Does your ANR work if you plug it into the intercom alone and the HT is off?
I think I'd want it that way -- keep the electrons in the radio for when they're needed, all you'd have to do is patch the headset straight into the radio if the intercom batteries died.
Quick Google research brought me to this website though, which is fascinating. I wonder if he has A&P sign-offs for that antenna farm on his Skylane...
http://www.omen.com/f/avradio.html
I've done Amateur Radio aeronautical mobile, but we kept the antennas inside the aircraft. We went up in the comfy Skylane and chatted to folks willing to climb Colorado's 14,000' MSL or higher peaks...
http://14er.org/
We completely isolated the aircraft radio system and the Amateur gear so I could concentrate on flying the aircraft and dad ran the Amateur rigs. We even isolated the power systems, and loaded a very large sealed-lead-acid battery (like the kind you see in room-sized UPS systems) under the rear seat. The antennas were on a steel plate fabricated out of an old GE MASTR II mobile radio's cover, used as an RF ground-plane, which was lashed down in the baggage area.