[AMRadio] HVAC RFI Question


Bill Guyger bguyger at yahoo.com
Sat Jul 29 22:06:16 EDT 2017


Let's hear it for Magic Eye Tubes!!!

Bill AD5OL 

Sent from my iPhone

> On Jul 29, 2017, at 6:06 PM, Oliver Steiner <steinerviolinist at gmail.com> wrote:
> 
> When I go on the air, the electronic brain in my oven goes nuts.  It
> seems like almost everything nowadays has some sort of computer
> circuitry and digital readout. I long for the days when ovens didn't
> have brains and were simply ovens.  If there has to be some electrical
> add-on in an oven, I'd rather it would be an electron ray tube (green
> eye)!
> 
>> On 7/29/17, Bill Guyger via AMRadio <amradio at mailman.qth.net> wrote:
>> While I haven't had to deal with this, there was an article in QST a couple
>> of years ago by a ham who did have problems with his A/C unit. IIRC he was
>> able to solve it with liberal application of ferrite beads / torroids. You
>> might do a search for the article, but then you might not have an issue to
>> begin with.
>> 
>> You have other computers even in your shack, and chances are if you have any
>> modern appliances they have micro controllers. I agree it's best to be
>> prepared, but you might be ok.
>> 
>> Bill AD5OL
>> 
>> Sent from my iPhone
>> 
>>> On Jul 29, 2017, at 4:26 PM, Jim Candela <jcandela at prodigy.net> wrote:
>>> 
>>> 
>>> 
>>> My old 2001 vintage American Standard AC system is conking out. I am
>>> looking for a replacement, and this post is regarding HVAC induced RFI
>>> into the ham bands. In order to get the SEER rating to 20 or above, then
>>> both the AC air ventilator & outside compressor must be computerized, have
>>> variable speed motors, and even have a CAT-5 cable between the units.
>>> 
>>> Those issues mentioned are all a red flag when it comes to RFI. One quote
>>> I got was to use Lennox, XC20 Condenser, and SL280 furnace and air
>>> handler, cost $10125. A more traditional system without the bells and
>>> whistles is about $6180. This does not include the duct rework that in my
>>> case has been haphazardly redone by the prior owner of the house.
>>> I wonder what experience the group might have regarding the various modern
>>> day HVAC systems, and HAM radio RFI. Go a step further, and I could see
>>> situations where a keyed up ham station might result in RF getting into
>>> the HVAC control system and creating a system that is susceptible to RF.
>>> JimWd5JKO
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>> 
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> 
> 
> -- 
> http://oliversteiner.com



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