Let me make a brief comment.
I think it is more accurate to say Pin 1 problems are the most common
cause of RF Suscepiblity (not RFI). In industry terms, susceptibility
is interference from an intentional radiator into a piece of equipment.
RFI or EMI is interference from an unintentional radiator into equipment.
Pin 1 problems can cause RFI but I don't think they are a major cause
compared to common mode cable currents and large differential cable
currents which get partially converted to common mode currents via
imbalance. I don't believe that FCC Part 15 specifically tests
susceptability but many other standards do.
73,
Larry, W0QE
On 6/8/2013 10:37 PM, Jim Brown wrote:
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
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