Hi again,
Be sure to define what no RFI means to the installer in a way you can
test, and prove, and document how the test is to be made, and what the
levels are to be under.
If I remember correctly, the wording I introduced into the contract was
noise level not to exceed S4 on any frequency, using my existing
antennas and radio, set up for SSB reception.
Frankly I am surprised they signed, but I told them it was show stopper
if they did not. I also told them I was willing to work with them in
reducing RFI, and that they should contact the manufacture regarding
RFI, PRIOR to bidding.
73s and thanks,
Dave
NK7Z
http://www.nk7z.net
On 07/07/2017 10:11 AM, John Pelham wrote:
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
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