Off topic here:
I am experimenting with two different antennas and would like to switch between
them with a relay. I am considering getting an isolator that permits placing
the DC control voltage on the rf coax. Any thoughts on this? I have never
done this before and would appreciate any
Cavalla, USS Stewart
From: John Saxon johnbsa...@yahoo.com
To: elecraft@mailman.qth.net elecraft@mailman.qth.net
Sent: Tuesday, February 11, 2014 12:34 PM
Subject: [Elecraft] OT ... Coax DC isolator
Off topic here:
I am experimenting with two different antennas
elecraft@mailman.qth.net
Sent: Tuesday, February 11, 2014 12:34 PM
Subject: [Elecraft] OT ... Coax DC isolator
Off topic here:
I am experimenting with two different antennas and would like to switch
between them with a relay. I am considering getting an isolator that permits
placing the DC
John,
Does isolators are called bias-Ts. They are a common way to do what
you want. You should be able to buy one without great difficulty. Just
make sure that the one you buy is for the frequency range you plan to
use it in. MFJ makes one for HF if that is where you plan to operate.
73,
Here is an interesting article:
http://www.ad5x.com/images/Articles/BiasT3amp.pdf
Svend, OZ7UV
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Post:
On Tue, 11 Feb 2014 10:34:20 -0800 (PST), John Saxon wrote:
I am experimenting with two different antennas and would like to switch bet=
ween them with a relay. =A0I am considering getting an isolator that permit=
s placing the DC control voltage on the rf coax. =A0Any thoughts on this? =
Spanget
Sent: 11 February 2014 20:18
To: elecraft @ mailman . qth . net
Subject: Re: [Elecraft] OT ... Coax DC isolator
Here is an interesting article:
http://www.ad5x.com/images/Articles/BiasT3amp.pdf
Svend, OZ7UV
Many, many thanks for the fine comments and suggestions. I am going with the
MFJ-4712 which is the bias tee and the relay and switch...complete and
ready-to-go.
Thanks again 73,
John
K5ENQ
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Are there possible precautions to take when running DC through a remote
antenna (coax) switch that may go to ground when the power is off?
Dick - KA5KKT
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