Thanks for the input, Gerry. The 18-turn choke described below would be a good starting point for RFI on the AM broadcast band.

73, Jim K9YC

On Tue,6/7/2016 2:46 PM, Gerry leary wrote:
I found an off a lot of interference on the a.m. band from other radios. So for 
example my roommate who lives downstairs, couldn't use much of his a.m. radio 
receiving abilities when I use that charger..

Sent from my iPhone this time

>On Jun 6, 2016, at 6:27 AM, thelastdb<thelas...@gmail.com>  wrote:
>
>I have not experienced any RFI from my 4A Genasun MPPT controller.
>Myron WVĂ˜HPrinted on Recycled Data -------- Original message --------From: Jim 
Brown<j...@audiosystemsgroup.com>  Date: 6/6/2016  4:20 AM  (GMT-07:00) 
To:elecraft@mailman.qth.net  Subject: Re: [Elecraft] Field Day
>>On Sun,6/5/2016 7:50 PM, Howard Hoyt wrote:
>>Has anyone on this list used one of the Bioenno MPPT chargers, and are
>>they RF quiet?
>
>Pretty quiet, but not totally so. The answer depends on proximity of
>antennas and operating frequency. I just tested the 4A charger they
>supplied for my 20Ah battery and heard a very low level buzz on the 160M
>antenna 25 ft from my shack. A choke with 18 turns on a single #31
>2.4-in diameter toroid killed it.


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