We have 3 sets of the W1GAN duplexers here in San Antonio that I know of (San Antonio Repeater Organization), 2 on the air and one in a backup cabinet. I'm curious how many others are out there in service. I wasn't around when they were built but I was told ours were silver plated.
Don Kirchner W5DK From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mike Morris WA6ILQ Sent: Wednesday, April 29, 2009 2:33 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: W1GAN and square duplexers aka homebrew duplexer --- On Tue, 4/28/09, cruizzer77 <atlant...@gmx.ch> wrote: From: cruizzer77 <atlant...@gmx.ch> Subject: [Repeater-Builder] Re: W1GAN and square duplexers aka homebrew duplexer To: Repeater-Builder@yahoogroups.com Date: Tuesday, April 28, 2009, 5:18 AM It's interesting to hear about your projects! I would be interested in knowing which VHF manual you're referring to, Jim. At 08:32 AM 04/29/09, you wrote: As I recall, an early ARRL VHF manual had a brief chapter on repeaters, and I believe there were two articles that were of interest. One was the duplexer and another was a four bay folded dipole antenna for repeater use. The duplexer article is on the antennas page at repeater-builder.com "A Homemade Duplexer for 2-Meter Repeaters" by John Bilodeau, W1GAN (from the July 1972 QST magazine) < <http://www.repeater-builder.com/antenna/w1gan-duplexer.pdf> http://www.repeater-builder.com/antenna/w1gan-duplexer.pdf> I'd like to get a scan of that ARRL antenna article for the antennas page (repeater-builder has permission from the ARRL to post PDFs of any articles in QST or their books). If you know where the four vertical bay antenna article is located, you may find the duplexer article also. I think it also was a QST article. You may be thinking of the 73 Magazine article that is on the antennas page... "440 MHz Folded Dipole Repeater Antenna" (222kb PDF file) This is a two page PDF file of the classic 73 Magazine construction article by Chuck Kelsey WB2EDV - Yes, you can build yourself a DB-224 folded dipole array. < <http://www.repeater-builder.com/antenna/440fdipl.pdf> http://www.repeater-builder.com/antenna/440fdipl.pdf> I remember one fellow who built the duplexer complained that when it was hit by lightning, it disassembled itself. He had made the outside tube out of individual sheets of copper soldered together, and the solder joints let go when it took the strike. That's what the PolyPhaser is for... mounted to the grounded copper plate in the building wall... 73 - Jim W5ZIT Mike WA6ILQ
