[Elecraft] Furnace RF Noise

[Jim Brown]

On Mon,2/29/2016 2:29 PM, Brian Hunt wrote:
> I completely eliminated blower noise from my new Bryant furnace with type 31 snap on ferrite beads on the control lines. Two 1/2 inch beads on each line with 3 turns through each bead as close to the cabinet exit as possible. Took the noise from S7 to my usual -125 dBm band noise level. No need for a line filter.

Remember that the number of turns required will depend on the 
frequency(ies) where there is RFI. 3 turns peaks more or less around 
10M. If you have noise below that, you'll want more turns (a lot more 
for the lower bands like 80 and 40).

73, Jim K9YC