clam
Well Known Member
I have a side project going trying to refurbish a military helmet and convert to civilian use. I took the electronics out of an older Lightspeed Zulu ANR headset and installed them in the helmet. I then plugged this into the aircraft and they seemed to work well enough on the ground without the engine running in the passive mode. When I turned on the power for the ANR system, all was well for about 30 seconds, but then a loud, high frequency squeal developed in the left earphone. If I pull that earphone away from my head, i.e., allow a gap between my head and the ear cup, the squeal goes away. Also, if I take the helmet off no squeal is present, but if I place my hand near the earphone, the squeal returns.
So, it appears the ANR in the right earphone works fine. The left earphone works fine until some human body part is placed very near it.
Any ideas?
Plan B is to build up the helmet with a passive system and use CEP in-ear plugs.
Thanks
So, it appears the ANR in the right earphone works fine. The left earphone works fine until some human body part is placed very near it.
Any ideas?
Plan B is to build up the helmet with a passive system and use CEP in-ear plugs.
Thanks