I'll bite. I am not licensed for this part of the band so alot of my information is here say.
This is a chalanging band for a repeater as the agreed upon "split" is only 100kHz. and it is further complicated by the fact that there are only 4 official pairs in the FM portion of the band. All of the repeaters I have heard of are all split site with 3 miles minimum between RX and TX. Usually these are assembled by using a Low band Mastr-II and a UHF and swaping the UHFs RX and with the one in the Low band chassis and vice versa to create a integrated link radio, just add NHRC controllers in the MASTR-II version. Rumors are that the "Heliplexer" will work if calculated to 10M, but you will need 8 sections minimum and they will be approx 10-12' long. The one commercial Low Band repeater I have seen used 2 of the approx 7 ft tall 16" dia decibal products cavitys with hybrid rings attached, but the split was about 38MHz and 42 MHz out. For antennas you should consider a single folded dipole for each site, which can be easilly constructed with 1/2"or 3/4" copper water pipe. There are some plans bouncing around of an Aluminum Angle iron version but I don't care what your friend said, avoid Aluminum at all costs for anything! Just, Don't do it. CB antennas may provide decent results as well as the classic J pole. On Sun, 20 Mar 2005 20:53:21 -0000, eaulive2002 <[EMAIL PROTECTED]> wrote: > > > So... nobody? > > --- In Repeater-Builder@yahoogroups.com, "eaulive2002" > <[EMAIL PROTECTED]> wrote: > > > > > > Hi. > > > > I have two home made repeaters on the air below 30MHz and I would love > > to learn more about these when they are professionally installed and > > designed. > > > > If you could point me to technical sites talking about duplexers, > > cavities, amplifiers, antennas and such, it would be greatly > appreciated. > > > > Also if you have any experience in the field and have a web site put > > up, please by all means, indicate the link! > > > > Thanks to all. > > > > Olivier. > > Santo Domingo. > > > Yahoo! Groups Links > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/