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Re: [RFI] Solar panel RFI

To: rfi@contesting.com
Subject: Re: [RFI] Solar panel RFI
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Sun, 20 Feb 2022 16:31:57 -0800
List-post: <mailto:rfi@contesting.com>
On 2/20/2022 2:48 PM, Dave (NK7Z) wrote:
That is most interesting material, thank you!  Will you all be including a test fixture description as well?

Yes. One of several jigs I use is a BNC to Pomona male adapter with alligator clips fitting over over the male pins. I use it at the end of a suitable piece of RG400, and dangle it off the arm of a chair. For calibration, I use a piece of #10 copper, folded over and covered with solder as a short, a 1% large format 49.9 ohm chip resistor. To verify calibration at high frequency, I use a similar chip resistor, 5K or more.

I don't trust this jig for precision much above 10-15 MHz, but it's plenty good for this purpose.

I can get repeatable results measuring a single turn (one pass through the core) for everything I've tested with the exception of #61, which comes nowhere near data sheet values for ui for a half dozen cores I've measured. This one must be identified by its extremely narrow resonance at HF.

As of a few days ago, Ward had sent it to layout, along with printouts of VNWA log impedance sweeps of the 12 and 16 turns through the six mixes of Fair-Rite 2.4-in o.d. toroids in my stash -- #31, 43, 52, 61, 75, and 78.

73, Jim K9YC

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