Re: Topband: Switching Pennants
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
Re: Topband: Switching Pennants
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
Re: Topband: Switching Pennants
Hi Dwight, I just added the schematic of my 3 Pennant RX antenna switching system to my website. http://sites.google.com/site/pennantflagantennas/ Just FYI, Don (wd8dsb) _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Switching Pennants
Most common K9AY relay-switching configuration involves a single transformer, with relay-switching at the high impedance side, and just inches of run from the transformer to the relays to the loops. The unused loops are left open (not connected either side). The proposed single-transformer pennant relay configuration sounds almost exactly the same. (Except no reversing relay as termination is symmetrical.) Pennants are typically just a little bit higher impedance than K9AY, yes? Tim N3QE 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
Re: Topband: Switching Pennants
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
