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
>
>
>
>
>
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