[CQ-Contest] station re-building, distortion when multiple 600 Ohm lines in parallel?

Jim Brown k9yc at audiosystemsgroup.com
Sat Mar 16 13:48:29 EDT 2019


On 3/15/2019 7:08 PM, Holger Hannemann wrote:
> Does anyone has experience with potential distortion when operating parallel
> running open feeder lines?

Distortion requires a non-linear element in the signal path. 
Transmission lines are inherently linear. There IS the possibility of 
distortion in a ferrite core device used to transform impedance at 
either end of the line. Air core transformers would not have this problem.

I think you're right to be concerned about crosstalk between multiple 
lines running parallel to each other for these long distances, which 
will be in addition to the crosstalk between antennas. In any event, you 
will need serious filtering for amplifier harmonics just as with any 
other multi-transmitter station.

73, Jim K9YC


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