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Re: [RFI] EMI-Free Vehicle Inverters

To: "rfi@contesting.com" <rfi@contesting.com>
Subject: Re: [RFI] EMI-Free Vehicle Inverters
From: David Klinect via RFI <rfi@contesting.com>
Reply-to: David Klinect <daklinect@aep.com>
Date: Tue, 24 Mar 2020 11:33:02 +0000
List-post: <mailto:rfi@contesting.com>
Thanks, Jim.  Not looking at any specific ham band..............would prefer 
that It be EMI-Free on all (or as much as possible) of the HF range.  Always 
appreciate your insights into these matters.......as well as your write-ups and 
tutorials.



Dave KA8MHW

------------------------------------------

On 3/23/2020 12:36 PM, David Eckhardt wrote:

> How much power (watts) are you shopping for?  I presume you are going from

> a 12 vdc system to a 120 vac/60 Hz system?



And on what band(s) does it need to be quiet?  Page 13 of the link below

details what we had to do to a GOOD unit to make it quiet enough to hear

weak signals on a Hamstick 3 ft away. The little clamps with no winding

(with ferrites, this counts as a single turn) are for VHF; those with

multiple turns are for the HF bands we were using mobile -- 15,20, 40.

Except for those single-turn clamps, all the ferrites are Fair-Rite #31.



http://k9yc.com/KillingReceiveNoise.pdf



BTW -- we were unable to kill noise from a bigger unit in the same

product series of "pure sine-wave inverters."


73, Jim K9YC
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