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Old 08-26-2017, 07:49 AM   #5
diver dave
City: Fairport, NY and Palm Coast, FL
Country: United States
Join Date: Jan 2017
Posts: 1,793
HIghly unlikely 3 radios are transmitting hum on the signal, especially the HH. Please describe the test condition.
I do believe the non-sine invertor is a noisy device, electronically speaking, however.

"Non-sine" or "Modified sine" means there are many frequencies being generated beyond 60Hz, which is not an advantage to any comm device.
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