[RFI] Investigating receive noise - got a few questions
jim at audiosystemsgroup.com
Thu Dec 20 20:02:42 EST 2018
On 12/20/2018 4:24 PM, Andy KU7T wrote:
> (medium impact) my two Trane XL 15i heatpumps. When they run the create nasty spikes on 20 and 15, that are about 20kzh apart and about 5 – 10 db above noise floor. I want to fix this.
This is most likely caused by a variable speed motor controller. The
first thing to try is ferrite chokes on the power cord and any other
wiring (like a thermostat) leaving the units. If that doesn't fix it,
you'll need to go inside to choke the cable between the controller and
the motor. It's also a good idea to call Trane and ask them for a fix.
Mfrs of stuff like this often have RFI kits. But try the ferrite chokes
before you spend any real money on them.
Congrats on your excellent work so far.
73, Jim K9YC
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