[RFI] Interference from AC units

Richard Battles wb4byq at gmail.com
Sun Aug 28 15:19:53 PDT 2011

using the ft-240-43 ferrite cores, we wound multiple turns of the control
wires on each core, i believe about 14 turns at each core.  had a trane
ac/gas heat unit at my previous home, a seer 13 unit, and had birdies on 14
mhz from the control board going to the outside unit, and the themostat.
the cores with multiple turns fixed the problem.  not using any snap on
units here.


On Fri, Aug 26, 2011 at 7:08 PM, Richard Battles <wb4byq at gmail.com> wrote:

> I have a new home and research the same problem.  i purchased a Rheem
> system
> call the super quite 80 ac/heat pump with lp gas heat backup.  no rfi.  now
> i had the installer
> put ft-240-43 ferrite cores on the wires leaving the unit to the wall
> thermostat, outside unit, and what ever else.  i have taken the yease
> ft-897d with a sense ant up to the unit and no reveived
> rfi at all.  my system is a seer 13, works very well but the new house has
> r-50 in the attic, r-15 plus in outer walls, r-19 in floor, and r-11 in the
> interior walls.  my unit uses ac/capacitor start motors.
> My neighbor about 400 feet from me installed a Carrier seer 15 unit, and
> the ac man used a air handler with ac/capacitor start motors and i hear no
> RFI.
> richard
>   On Fri, Aug 26, 2011 at 3:39 PM, Mark Tyler <k5gq at juno.com> wrote:
>> I believe my AC compressor is about to die.  The current is about 20% more
>> than name plate. I am worried the newer units might generate noise that
>> would reduce the ability to hear CW QRP stations. What brand and type are
>> OK?   TRANE -- all models? What ones are not? Mark    K5GQHOUSTON, TX
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