[Amps] RFI Question

[k7fm]

"How close is your neighbor? What model radio are you using
and is the output resonably clean?"

It does not matter what kind of rig is being used nor how clean it is.  You 
could have a rig with substantial harmonics and one that has no harmonics. 
One can have -10 db 3rd order imd and the other -50.  The results will be 
the same.

A device that is designed as a switch at 60 Hz is acting as an hf receiver. 
What is happening is receiver overload.  Nothing can be done at the 
transmitter, except to reduce power or move the transmitting antenna further 
away from the receiver (or receiving antenna - the lines going to the 
switching device).  There is a rare occasion when the transmitter is 
radiating through the power line, but that can be solved with a power line 
filter at the transmitter.

Buying a low pass filter to solve a telephone problem, or buying a new rig 
with class A finals will not solve an overload problem on a switch.  Often, 
these switches that are affected by stray rf are also bad crap generators, 
putting square waves on your ham bands, and using their same wiring for 
antennas.

Tell the neighbor to get a new dimmer, or better yet, replace the dimmer 
with a swtich and forget the dimmer.  If the light is too bright, put in a 
smaller bulb.

If the dimmer is in a lamp, you can simply install a ferrite line core 
around the line where it eneters the lamp.  The antenna goes away and 
neighbor is happy.

Decades ago I defended a gentlemen who had a neighbor who turned her 
television set too loud and left her window open so everyone in the 
neighborhood was annoyed.  He asked her to turn it down, but she refused. 
One day he knocked on the door and when she opened it, he took his hunting 
rifle and blew away the television set.  Fortunately, it was in the old days 
when judges had a sense of humor and were not locked in to mandatory prison 
sentences.  The judge gave a lecture to the woman and made my client pay for 
the damage and spend a month in the pokey.  I even got his hunting rifle 
back.  Today, he would have 3 life sentences and be listed on the television 
predator list.

Colin  K7FM