Even some non-variable-speed setups can emit RFI. In 2010 I needed a new
system, and specified no variable speed to the contractor. I got a Trane system
that had a G.E. ECM (electronically commutated) motor in the inside air
handler. It had three taps (the installer moves a jumper) to select three fixed
speeds. There was RFI. I was able to fix it with #31 ferrites.
But the best advice is from Dave, below: Get 'no RFI' in writing and don't
trust a handshake.
73,
John W1JA
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Dave Cole
Sent: Friday, July 7, 2017 12:50 PM
To: rfi@contesting.com
Subject: Re: [RFI] Any RFI issues with Amana AMVC96 Furnace?
I now monitor my RFI environment monthly using this method:
http://nk7z.net/sdr-rfi-survey-p1/
73s and thanks,
Dave
NK7Z
http://www.nk7z.net
On 07/07/2017 09:29 AM, Jim Brown wrote:
> Dave has given good advice. I'll add that variable-speed motor
> controllers are a well known cause of RFI.
>
> 73, Jim K9YC
>
> On 7/7/2017 9:13 AM, Dave Cole wrote:
>> If it were me, I would not rely on past reports. manufactures change
>> specs, change parts suppliers, etc...
>>
>> I told my heating company when I replaced my heater, that I did not
>> care what they installed as long as it did not generate RFI, above a
>> set level on my radio.
>>
>> I also had that written into the contract, and that if it did, they
>> had two months to solve it, or replace the unit.
>>
>> This caused them to do their homework in advance of suggesting a unit
>> to me. We took S meter readings on all bands, and I gave them a
>> copy. I got a RFI quiet heater. No variable speed fan. I'm OK with
>> that. As per the installers, it turns out most manufactures have a
>> non variable speed option.
>>
>> Get it in writing! Don't trust a handshake.
>>
>> 73s and thanks,
>> Dave
>> NK7Z
>> http://www.nk7z.net
>>
>> On 07/07/2017 08:22 AM, George VE3YV wrote:
>>> Time for a new furnace. Does anyone have any RFI experience,
>>> positive or negative, with an Amana variable 2-speed gas furnace?
>>>
>>> Thanks!
>>>
>>> 73, George VE3YV / K8HI
>>> _______________________________________________
>>> RFI mailing list
>>> RFI@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>
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>
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