On 10/3/2024 7:00 PM, Tim Duffy wrote:
Here is a great high common mode impedance choke that I use just as George
explains. At the beginning and end of the feedline to all RX antennas.
https://www.dxengineering.com/parts/dxe-rxfc-75
I published these designs for chokes and transformers for RX antennas in
2018. The chokes are wound with one of the twisted pairs from CAT5
cable. Both transformers and chokes are wound on very low cost cores,
and intended for mounting in off-the-shelf weatherproof boxes.
http://k9yc.com/RXChokesTransformers.pdf
They've been in use here since around 2019 on Beverages and a spaced
pair of VE3DO loops steered with an NCC-1. My report on that system,
which includes extensive measurements of the NCC-1, is at
http://k9yc.com/VE3DO.pdf
73, Jim K9YC
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|