[Amps] The Pin One Problem

[Jim Brown]

On 6/8/2013 1:18 PM, Carl wrote:
> None of these radios have hum problems 

Repeat after me -- Pin One Problems are the most common cause of RFI.

The FT1000MP has a Pin One Problem at its mic input that causes RF 
feedback on 15M and 75M.  I confirmed this by driving it with an HP RF 
generator, using the method described in the AES Paper.  I killed the RF 
feedback with a common mode choke on the mic cable, which killed the 
antenna current. I have no experience with the other radios.

73, Jim K9YC