[Elecraft] Elecraft: RFI Problems

[Vic Rosenthal]

Martin.Evans at simoncarves.com wrote:

> 50Hz hum on key down on hi fi
> Similar problem on mains MW radio.
> Freezing of PC modem on key down.

My suggestions, in order:

1) Try wrapping the speaker leads of your hi fi around ferrite rods or toroids. 
  If this doesn't clear it up, try wrapping the mains cord from the hi fi around 
a ferrite as well.  Try to get as many turns as possble.  The clamp-on beads are 
not effective at HF.

2) Treat the radio in a similar fashion.

3) Use an inline telephone filter (such as the k-com or similar) on your modem 
phone line.  Also wrap the power wire to the modem around a ferrite.

4) Add a balun of some kind to your dipole.

There's a lot more that you can do, but this basic stuff should help.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco