----- Original Message ----- From: "David Wing" david@cdwing.com To: amsat-bb@amsat.org Sent: Friday, November 20, 2009 4:58 AM Subject: [amsat-bb] Running Power to the Polarity Switch
I'm making good progress to get my KLM and Cushcraft antennas mounted on
the
roof.I think I'll be able to wrap it all up this weekend.
Hi David,
Happy to hear about your progress.
I do have a question about the polarity switch on the Cushcraft 30 element 440 antenna. The switch has one lead that seems to be intended go to
+12vDC
and the negative lead goes to the boom of the antenna. Do I need connect -12vDC to the coax on my feed line in order to complete this circuit?
No .........run please a separate wire for the -12 volt DC
Seems easier to just disconnect the wire from the boom and run it to a dedicated -12vDC lead.
A dedicated wire for the -12 volt DC is best
My switch on my KLM is fed with dedicated leads for + and -
and it seems that would be the easiest way to deal with the Cushcraft.
Yes, I agree
Am I missing something obvious here? I have wires to spare and can so
it's
not a big savings to me to run the -12vDC on the coax if that is the
reason
why this was designed this way.
To run power supply to the above relay I have used a coax cable RG-58 The inner conductor for +12 volt DC and the braid for -12 Volt DC
Pointers and suggestions welcome.
73, David
73" de
i8CVS Domenico