Pete,
you are contradicting your self. You say you do not want power for an IC up
the tower but you are going to use relays :) Just wondering if your relays
do not require power :)
Now, I can envision a 10 wire cable running up de tower where the relays are
controlled :) you still have
to have EM & RF protection on the wires as 1KW of power ( and some how I
think you running a bit more than that :) in the antenna will translate in
many hundreds of
volts in the controlling wires that, in this case, will act as wonderful
antennas.
Then, you need to control de DC impedance of the wires as a run of, say 100
feet of it, will act as a wonderful coil making your relays to chatter like
an old lady dental plate for every open/close command !!!
I can see here a dream . An aluminum box with one or two PL259 inputs and 10
Outputs but with Fiber Optic Control Feed from the shack ! WOW ... Are you
ready to invest in FO? :)
Alex
===================================
If we can accept the notion that GUNS are
the killers and not the people, why is it that
we can not accept the idea that CARS are
the speeders and not the drivers?
Alex, trying to understand the world around.
==================================.
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: "TowerTalk Reflector" <towertalk@contesting.com>
Sent: Sunday, December 23, 2001 4:42 PM
Subject: RE: [TowerTalk] Decoding BCD with passive circuit
>
> At 12:37 PM 12/23/01 -0600, Dale L Martin wrote:
> >
> >
> >try http://www.sandlabs.com/answers.htm
> >(verified as good before transmission of this note.)
>
> Yes, but there was a reason I specified passive decoding -- I don't want
to
> have to power an IC or individual gates at the tower, nor do I want to
have
> to protect them against static electricity/lightning EMP.
>
> The only solution that fills the bill so far is the cascaded relay
approach
> described by W8JI. It is similar in concept to the RCS-4/Heathkit
> cableless antenna switch, but uses an SPDT, a DPDT, and a 4PDT to yield 8
> separate outputs from one input, controlled by 3 wires plus ground return
> via the coax shield.
>
> 73, Pete N4ZR
>
> The revised World Contest
> Station Database
> is online at www.pvrc.org
>
>
>
>
>
> AN Wireless Self Supporting Towers are now available! Windloading tables,
> foundation diagrams and charts, along with full details are now at the
> AN Wireless Web site: http://www.ANWireless.com
>
> -----
> FAQ on WWW: http://www.contesting.com/FAQ/towertalk
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
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>
AN Wireless Self Supporting Towers are now available! Windloading tables,
foundation diagrams and charts, along with full details are now at the
AN Wireless Web site: http://www.ANWireless.com
-----
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
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|