Re: Two UHF repeaters sharing the same antenna.
|
I did lol? we're going to try to go back up to the side again over the Thanksgiving holidays hopefully we can get this thing back up online and working. Frequency on the ham band is 444.050 plus offset
And the commercial band is 462.275 plus offset.
I have two other old station Masters down in the shop. One of these I'm going to use to replace the broken one up on the tower.
I'm sure you knew what I meant... 500 KHz between TX frequencies
(not MHz).
Jim W7RY
On 11/21/2022 7:33 AM, Keith Ford
wrote:
Thanks Jim for the reply yeah I have to Motorola
Micor and a Motorola quantar they have the same setup as you're
talking about but one of them is a six cavitity T1500 and the
other a six cavity which should supply even more isolation
between the two.
Yes.
Motorola UHF community repeaters were done this way for
years configured the following way:
- 500 KHz or more spacing
between transmit frequencies
- 4 cavity Bandpass duplexers on each repeater
- DUAL circulator/isolator on the output of each
transmitter between the duplexer and transmitter
- Proper cable lengths between the output of each
duplexer to the common shared antenna
Worked great with minimal losses and no desensce. If you
look at the spec sheet for the T1500 series of duplexer,
you may find the cable information in that document for
doing just this. A UHF 50 ohm antenna combiner/splitter
would do the same thing of combining the outputs of each
duplexer.
73, Jim W7RY
On 11/16/2022 9:11 AM, Keith Ford wrote:
can I put two UHF repeaters on the same
antenna by putting some filtering in between them one is
in business band and the other one is amateur radio
band. Just reaching out there in a group has anybody
ever done this before I've got one antenna that is
damaged it appears to have water in it and the SWR is
high.
thanks.
KF4RGR? ? ? ?Keith Ford
--
Thanks and 73, Jim W7RY
--
Thanks and 73, Jim W7RY
|
