I have an EU 2000. Only place I can hear it (I’ve tried a few different setups)
is on 80m (note: not tried on 160)
Took the extension cord for it, put a few (4? Would have to look) through a
type 43, and then it was VERY hard to detect. I’ve been very tempted to open it
up, and put the ferites right before the outlet, but haven’t
--
73 de KG2V
Charlie
> On Sep 20, 2020, at 12:10 PM, Kimo Chun <kimochun@gmail.com> wrote:
>
> All good advice. It is safe to assume that virtually all inverter
> generators generate rfi noise. It is safe to assume that the bulk of their
> market/customer doesn't care about or need clean outputs so they don't care
> either. I used to have one of the last generation of completely shrouded
> conventional Honda generators EX3300. It was stolen. I wish I had it now.
> Honda doesn't make them anymore. Too bad.
>
> Though I have not tested newer delivered models, the original EU1000 and
> larger models all generate RFI. It was more prevalent/noticeable on lower
> frequency bands, say 20m and lower. I have one EU1000 that was modified by
> a top notch engineer/ham friend to minimize this. I don't have the details
> nor have I taken it apart to learn what was done. I just bought it off him
> as he was moving. We've successfully used homebrew inline common mode
> chokes using Type 31 cores on AC extensions leaving the generators that
> have worked OK. No, I didn't do measurement tests (I could) but it was fine
> for our Field Day operations. For a fixed, longer term situation more
> testing would be in order. A friend bought a Honda 7kw model that had the
> same problem. I don't know if he was similarly successful. I didn't follow
> up.
> If you want to circumvent this issue purchase a conventional generator and
> stay away from inverter types. Otherwise, be prepared to clean it up
> yourself.
>
> The other issue people don't pay attention to is generator design and
> application. None of the typical home power backup generators (Generac,
> etc.) offered are for continuous - off grid use. You can use them for some
> hours per day or perhaps for a few days (see their instructions) at a
> time. If you are looking for near continuous power after a hurricane for
> possibly a few weeks (your fuel problem notwithstanding) you need a much
> better, different generator designed for that. It will often run at lower
> RPM and have other heavy duty design features which require significant
> monitoring and maintenance.
> Or use their commonly sold one and pray and accept their failure. Say,
> purchase a new one after each major use, assuming it did last through that
> event. Perhaps a viable risk.
>
> 73, Aloha
> Kimo Chun KH7U
>
>
>
> Date: Sun, 20 Sep 2020 06:46:45 -0700
> From: Dave Cole <dave@nk7z.net>
> To: rfi@contesting.com
> Subject: Re: [RFI] Inverters?
> Message-ID: <58123b6c-8262-97ab-1929-dfb0c78f0b51@nk7z.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> The best test is to bring a portable shortwave radio, and listen before
> you buy... Most places, have a demo generator set up.Make it clear to
> the vendor that if the unit is generating RFI you will be returning it,
> with the expectation of a full refund.
>
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist, RFI
> ARRL Asst. Director, NW Division, Technical Resources
>
>> On 9/19/20 9:23 PM, Warren Wolff via RFI wrote:
>> ? I am considering the purchase of an emergency back-upgenerator.? For
> the first time, I have encountered unitstagged as ?inverters?.? Does this
> mean that some systemsare AC generators while the ?Inverter-types?
> generateDC and then convert it to AC?? ? ?Inverter? immediatelyprecipitates
> the worry of RFI.? Comments, please.
>> WarrenW7WY
>> _______________________________________________
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>>
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