[TowerTalk] 12V through coax to switch antennas remotely

[Steve Bookout]

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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