Right, I expect the long wire goes to +12vDC and that the negative is run over the coax. Is the only reason to run it over coax to save from having to run another wire? I've got extra wires available and would prefer to run it direct rather than on the coax...no problem with that do you think?
I'll be off the birds over the weekend while I move the rotator and cables around. 73, David K6CDW -----Original Message----- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of w6...@comcast.net Sent: Friday, November 20, 2009 7:00 AM To: i8cvs Cc: amsat-bb Subject: [amsat-bb] Re: Running Power to the Polarity Switch I just rebuilt my rotor/antenna system here, and I am using the "spare" 2-#18 conductors in the rotor cable for each rotor as my 12 volt line to each of the yagi's. In the house, I just run to a DPDT switch and use a WallWart for the 12 volts. David, I think that long black wire goes to +12 volts, not negative, as I noted one wire went to the boom for the return, suspecting he used the coax as the ground point. I may be wrong. John ----- Original Message ----- From: "i8cvs" <domenico.i8...@tin.it> To: "David Wing" <da...@cdwing.com>, "AMSAT-BB" <amsat-bb@amsat.org> Sent: Thursday, November 19, 2009 11:07:56 PM GMT -08:00 US/Canada Pacific Subject: [amsat-bb] Re: Running Power to the Polarity Switch ----- Original Message ----- From: "David Wing" <da...@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 _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
