Do you use wireless mics?
Any chance you could bring a portable SW receiver
and see what might be on those freqs?
It would be good to know if 6M is clean - do you have
a TV on a set-top antenna?
So. Korea manufacture sure is far better than China!
> Years ago, I had a lot of bad experiences with variable speed motor
> drives, but those were in industrial applications. I know that technology
> has improved EMC performance in many ways, and any that are rated for
> residential applications might (not certain!) have some greater degree of
> noise reduction than industrial systems. I can tell you that last year,
> the church I attend had eight (8) systems similar to yours installed to
> provide air conditioning and extra heat to our 105 year old building in
> eastern Iowa. I am the sound system engineer for the church (as well as
> one of the Trustees who had to decide on whether to buy the systems) and
> had a lot of worries about hash getting into the audio system. No problem
> to date, even though the power feeds to some of the heat pump systems are
> in the same power panel as feeds power to the audio system.
>
> Yes, I know that an audio system is not a radio system, but it does have a
> lot of wiring (a.k.a. "antennas) running around with low level signals. I
> have been impressed with the fact that since each of the 8 systems
> operates independantly of the others, on-off switching and varying of
> blower speeds is random and could be happening many times per hour. Our
> units are not the same brand as yours, but they are from a South Korean
> manufacturer. They otherwise seem very similar to what you are
> considering. We've been happy with the rebate we got from the power
> company and the first winter's savings in cost of heating an old building
> here in the Midwest.
>
> 73, Dale
> WA9ENA
>
> To
> rfi@contesting.com
> cc
>
> Subject
> [RFI] RFI from Inverter Technology in Split AC Systems?
>
> We are looking at the Sanyo Flexi-Multi Series CMH3172
> 30,600 BTU Multi-System Heat Pump Ductless Split Outdoor
> Unit with DC Inverter, Microprocessor Control and Auto Fan
> Speeds.
>
> http://www.ajmadison.com/cgi-bin/ajmadison/CMH3172.html
>
> It seems efficient, will handle our somewhat unique layout,
> and is low-profile.
>
> I am concerned about the "inverter technology" as I worry
> it may generate a *lot* of RFI. Is that a reasonable
> concern?
>
> WDYT?
>
--
.Thanks! & 73, doc, KD4E
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