Last August I replaced my dead furnace with a new Carrier Model 59TP6A060 variable speed, 2-stage furnace. Right away I noticed that I had loud blower motor noise ever 18 kHz on most bands but it was
Call the vendor. Many have optional line filters. Variable speed drives are inherently noisy -- they start with a Switch Mode Power Supply, and then they pulse-width modulate what's left to control t
Hi Jim (W9UUM) As Jim (K9YC) said, call the vendor and inquire about input line filters. If you hit a dead end you can check out my solution for treadmills that also have variable speed drives, and y
Hello Jim: I had a new HVAC system installed last year - It is the American Standard brand. I had bad RFI on 20 meters. I found this document: http://www.crompton.com/hamradio/Trane%20XV95%20RFI%20Do
Thanks for this very valuable info. Our hvac system is near replacement time, good to know that Trane corp knows (and apparently, understands) about and can do something about RFI from their hvac sys
If possible, when you replace your HVAC system, have the company doing the install write into the contract both you and they sign, that the new device will not generate RFI, and will be FCC part 15 c
I'm not a lawyer, but part 15.103(d) appears to exempt furnaces. If possible, when you replace your HVAC system, have the company doing the install write into the contract both you and they sign, tha
That is why the additional clause "that the new device won't generate RFI", was added... That gets around 15.103(d). -- 73's, and thanks, Dave For software/hardware reviews see: http://www.nk7z.net
Obviously, you are not a lawyer either. I would not mention things that have no applicability to the issue or you're going to get arguments that they are compliant with Part 15, and now that you've m
The Trane RFI document validates my belief that the thermostat wiring is an RFI mechanism although I had just the opposite problem. Every time I keyed the linear, the compressor would turn on. Luckil
Hello, I never claimed to be a lawyer, I am just relaying what happened, and what I did to obtain a positive result for my furnace install. -- 73's, and thanks, Dave For software/hardware reviews se
It may have been said already, but all pulse-width-controlled motors used in furnaces are compliant with the FCC rules if they have even a modest amount of filtering. A furnace is an appliance, as de
Ed, For years when buying nearly every electronic device I ask the store manager if he/she knows of any instance that the device I want to buy has previously caused radio frequency interference. I ha
Hi Ed, I think we need to be clear that even though those devices are exempt from specific emissions limits, per section 15.103 "The operator of the exempted device shall be required to stop operatin
Yes, I think that is known, but it never hurts to make that clear. So, if my home furnace interferes with my ham station, does my wife get the fine? She and I are both operators of the offending devi
That's the rub Ed... It's like your Riley H story... :) You have to get it in place prior to putting in the furnace, or TV,... :) Love that story! I have shared it with many people! Thanks!!
The operators could then take to litigation the mfg's of said device or appliance that caused harmful interference? Dale, K9VUJ Yes, I think that is known, but it never hurts to make that clear. So,
Larry, Did you ever had to deal with the seller when you encountered radio interference? Your experiences may be helpful. Ed, For years when buying nearly every electronic device I ask the store mana