Dwight, Correction, I should have said 0 volts over the control line (not feedline) selects one pennant, +12 volts selects the second pennant, and -12 volts (just reversing polarity of the power supply connected to the control line) selects the 3rd pennant.
Don On Wed, Aug 20, 2014 at 7:11 AM, Don Kirk <wd8...@gmail.com> wrote: > Hi Dwight, > > I have 3 point fed pennants that share the same feedpoint and use only one > BN-73-202 Binocular Core Transformer matching transformer at the feedpoint > (one pennant pointing 40 degrees, one pointing 160 degrees, and one > pointing 300 degrees) and have been using this system for over 3 years now > with no problems. I use two relays (located at the common center location > of the pennants to select the active pennant, and disconnect both sides of > the pennants that are not active from the matching transformer. > > Switching 3 pennants is very easy as it only requires one isolated 12 volt > supply and a two conductor control cable from the shack out to the relay > box which is located at the feedpoint. 0 volts over the feedline selects > one pennant, +12 volts selects the second pennant, and -12 volts (just > reversing polarity of the power supply connected to the control line) > selects the 3rd pennant. > > Here is a link to a simple website I have that documents my 3 pennant > system, and you can see a picture of the inside of my relay box on this > website. > http://sites.google.com/site/pennantflagantennas/ > > Simple and see no reason to do it any other way if using 3 pennants that > have a common center point location. > > 73, > Don > > > > On Tue, Aug 19, 2014 at 7:59 PM, Tom W8JI <w...@w8ji.com> wrote: > >> I would not switch high impedance lines without very special precautions. >> >> I really do not think it is worth the small parts savings. >> >> ----- Original Message ----- From: "DGB" <ns9i2...@bayland.net> >> To: <topband@contesting.com> >> Sent: Tuesday, August 19, 2014 4:38 PM >> Subject: Topband: Switching Pennants >> >> >> I am wanting a simple way of switching 3 or 4 pennants. Anyone done this? >>> >>> Quote From K6SEE ... All four Pennants would be installed with their >>> points all adjacent to each other. Only one feedline would be necessary >>> and only one >>> transformer would be necessary, with the high impedance winding of the >>> transformer being switched to the feedpoint of the Pennant in the desired >>> direction ... 73, de Earl, K6SE >>> >>> 73 Dwight NS9I >>> _________________ >>> Topband Reflector Archives - http://www.contesting.com/_topband >>> >>> >>> ----- >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2014.0.4745 / Virus Database: 4007/8063 - Release Date: 08/19/14 >>> >>> _________________ >> Topband Reflector Archives - http://www.contesting.com/_topband >> > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband