Telstar Electronics wrote:
On Sep 19, 7:19 pm, Fred McKenzie wrote:

...
A Honda "inverter" generator was used at this year's Field Day, but it
caused a broad-band noise on the HF bands...wiped-out
reception up to the 18 MHz range of the radio, when the radio was within
several feet of the generator.

Does anyone have experience cleaning-up the interference from the
inverter in one of these generators?

Fred
K4DII


How about a shielded enclosure. Attention would have to be given to
routing the exhaust and heat from the enclosure. Just a thought...
www.telstar-electronics.com

Not only exhaust, heat and fresh air for combustion, you'll need to
bypass/lowpass any electrical conductor going in or out of the
enclosure, and those cheap clip on ferrites won't do much good, you need
pi networks on the conductor itself. You might start with the inverter
section of the generator, make sure it's in a well sealed (electrically)
enclosure, bypass/lowpass the conductors coming out of it and as long as
you don't cause problems with circuit cooling put some RF absorber
inside the enclosure, if it gets absorbed inside it won't get out, and
don't be dissuaded by the absorber specs, they work quite well in the HF
range. You can also get free samples.

http://www.specemc.com/emipower.asp
http://www.cumingmw.com/micro_rf_pc.html
http://www.eccosorb.com/pages/89/Product+Index

Been there, Good luck,
W8LNA