Thank you, Don............more good ideas to investigate! Dave KA8MHW
-----Original Message-----
From: Don <kb5kwv@gmail.com>
Sent: Tuesday, March 24, 2020 3:55 PM
To: David Klinect <daklinect@aep.com>
Subject: [EXTERNAL] Re: [RFI] EMI-Free Vehicle Inverters
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I use this inverter off of my bench batteries to run my PC, monitor and
such. I mounted close to the batteries with 12" cable, I have very
little RFI, mainly 160/75 Meters. The noise is about 3-5 dB above
background noise.
https://urldefense.proofpoint.com/v2/url?u=https-3A__smile.amazon.com_gp_product_B00F4TBW6S_&d=DwICaQ&c=16VmlS4MonZN71XwTUYWYA&r=5sbCa3A98Man-4HZJmHlahpT0tdipMkWFucGHbSgMLE&m=M9s9Qujl4vGEHAKgBPgq9rWZ--uwcZtDpxxG6p1eN0A&s=MAvo0BjPQ5tc4TUhaCjKDhr30FtedBKfyfuM-neWq6g&e=
On 3/24/2020 6:33 AM, David Klinect via RFI wrote:
> 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.
>
>
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__k9yc.com_KillingReceiveNoise.pdf&d=DwICaQ&c=16VmlS4MonZN71XwTUYWYA&r=5sbCa3A98Man-4HZJmHlahpT0tdipMkWFucGHbSgMLE&m=M9s9Qujl4vGEHAKgBPgq9rWZ--uwcZtDpxxG6p1eN0A&s=6zPiBYSgyslBCdmUg6Rl8UDjpYuHbHVB7TuhwAHh6_g&e=
>
>
>
>
> 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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