"Radio is sturdily constructed and amazingly small. Programmed it with the software from the miklor site and tried it out on my comet triband antenna on local repeaters in all 3 bands. Good audio reports although was noted as slightly muffled on highs. Power output is around 20 watts or a few under.
One odd behavior I did notice is TDR enabled or scanning from UHF/VHF to 220 results in relay noise.
"I suspect the 220 MHz band antenna lowpass filter is switched with a relay and the 2 meter lowpass filter and 70 cm highpass filters are switched with PIN diodes. A relay that completely isolated the 220 MHz RF filter is easier to do this than design a more complicated bandpass filter and the relay likely has less insertion loss and won't impact the RF performance of the 2 meter/70 cm bands. Based on that I would say the sound you are hearing is normal."
I e-mailed the Baofeng Tech guys and they confirmed this is normal behavior for the dual watch flipping between 440 or 2M and 220.
Some of the old ham equipment loaned to me when I was a baby Technician had mechanical relays in it for T/R. Makes me kinda nostalgic. ::tears::
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