[TowerTalk] 12V through coax to switch antennas remotely

N2TK, Tony tony.kaz at verizon.net
Tue Apr 3 09:32:24 EDT 2018

Have a question about the values of the choke to keep RF from the relay and
the caps for coupling of the signal. In different products I see quite a bit
of different values of both components.

For the coupling caps I see values from .01-.2uf. It would seem increasing
the value of the cap reduces the Xc. And for the choke I see values of
100uh-2.5mh. And it seems increasing the value of the choke also increases


My application is for 160M and 80M only with receive antennas.


My question - does it really make a difference over the values listed above?
Do all the values offer enough Xc or Xl to not cause any problems?  Is there
really a recommended "good" value for the caps and coils? Even 100uh offers
1K ohms at 1.8MHZ and .1uf is .8 ohms.


Still learning.


N2TK, Tony

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