Re: Topband: Antenna Switch isolation capacitor

[Tim Shoppa]

The Ameritron RCS-4 uses three .01uF 1kV disc capacitors in parallel in
this position.

I don't think 4 ohms of XC is a biggie in the antenna system SWR, but
increased current handling capability of paralleled capacitors is a real
advantage at legal limit.

Tim N3QE

On Tue, Jun 25, 2019 at 4:30 PM  wrote:

> Hi All,
>
> A friend on 160 has had a problem with a Heathkit remote antenna switch
> due to a partial failure of the isolation capacitor in the remote unit.
> It is a .02 uF 1.6 KV disc ceramic that isolates the DC from the antennas.
>
> Since this results in about 4.4 ohms of XC - capacitive reactance in
> series with the 160 TX antenna, I was wondering if it would it be worth
> while to substitute a .05 uF disc ceramic to reduce the capacitive
> reactance (XC) to under 2 ohms on 160 meters?
>
> Thanks any info.   73,
>
> George,  K8GG
>
>
>
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> Searchable Archives: http://www.contesting.com/_topband - Topband
> Reflector
>
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Re: Topband: Antenna Switch isolation capacitor

[FZ Bruce]

The capacitor value is OK, but disc ceramics do handle current well.
73Bruce, k1fz

-From: k...@voyager.net
To: topband@contesting.com
Cc: 
Sent: Tuesday June 25 2019 4:22:27PM
Subject: Topband: Antenna Switch isolation capacitor

Hi All,

 A friend on 160 has had a problem with a Heathkit remote antenna
switch
 due to a partial failure of the isolation capacitor in the remote
unit. 
 It is a .02 uF 1.6 KV disc ceramic that isolates the DC from the
antennas.

 Since this results in about 4.4 ohms of XC - capacitive reactance in
 series with the 160 TX antenna, I was wondering if it would it be
worth
 while to substitute a .05 uF disc ceramic to reduce the capacitive
 reactance (XC) to under 2 ohms on 160 meters?

 Thanks any info. 73,

 George, K8GG

 _
 Searchable Archives: http://www.contesting.com/_topband [1] - Topband
Reflector
 

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Topband: Antenna Switch isolation capacitor

[k8gg]

Hi All,

A friend on 160 has had a problem with a Heathkit remote antenna switch
due to a partial failure of the isolation capacitor in the remote unit. 
It is a .02 uF 1.6 KV disc ceramic that isolates the DC from the antennas.

Since this results in about 4.4 ohms of XC - capacitive reactance in
series with the 160 TX antenna, I was wondering if it would it be worth
while to substitute a .05 uF disc ceramic to reduce the capacitive
reactance (XC) to under 2 ohms on 160 meters?

Thanks any info.   73,

George,  K8GG



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