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Re: [Amps] The Pin One Problem

To: amps@contesting.com
Subject: Re: [Amps] The Pin One Problem
From: Larry Benko <xxw0qe@comcast.net>
Date: Sat, 08 Jun 2013 23:03:23 -0600
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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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