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Re: [Amps] The Pin One Problem

Subject: Re: [Amps] The Pin One Problem
From: Jim Brown <>
Date: Sat, 08 Jun 2013 21:37:16 -0700
List-post: <">>
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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