[RFI] EMI-Free Vehicle Inverters

[David Klinect]

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

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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