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Re: [TowerTalk] 12V through coax to switch antennas remotely

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 12V through coax to switch antennas remotely
From: Steve Bookout <steve@nr4m.com>
Date: Tue, 3 Apr 2018 11:42:49 -0400
List-post: <mailto:towertalk@contesting.com>
Hello Tony,

I would be more concerned with the current handling capability of the caps.

For my full-power transmit 4 squares, I use 4 parallel,  .01 uf @ 2kv ceramic caps for the blocking caps.  The actual capacitance is not that big a deal; it's what I had on hand.

You can find a handy capacitive reactance calculator at http://www.66pacific.com/calculators/capacitive-reactance-calculator.aspx

73 de Steve, NR4M

On 4/3/2018 9:32 AM, N2TK, Tony wrote:
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
Xl.

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.

Tnx

N2TK, Tony

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