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Author Topic: Rossband repeaters  (Read 1449 times)

KG9ZTX

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Rossband repeaters
« on: December 06, 2018, 11:38:25 PM »

How close can you setup two crossband repeaters?

Sinc the cost of a vhf repeater is cost prohibitive. I was thinking two crossband setup at some distance.

The thought would be vhf-uhf which then transmits to the other crossband repeater that then goes from ur to vhf. The vhf

Thought is for example purposes only..

Vhf in 146.900 uhf out 449.1000 —— uhf in 449.1000 vhf out 146.300
Uhf out on this crossband repeater could be 5watts. Vhf on both could b set to full 50 watts

Thereby creating a varied vhf repeater. For practical purposes one repeater could always be at at least a half mile, but sometimes at most a mile.

Is this feasible?
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N8AUC

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RE: Rossband repeaters
« Reply #1 on: December 07, 2018, 07:56:30 AM »

We used to do this to provide comms for a 3 day youth soccer tournament.

The receive site was about 2 miles (as the crow flies) from the transmit site.
Receiver was on a tower owned by the board of education (with permission), and
the transmitter was on the roof of a hospital. Both entities supported the
tournament, and they were happy to help us out with siting.

It worked pretty well.

I think your separation will also work pretty well. You are far enough apart
that the antenna for one half is not in the near field pattern of the other half.
More separation is usually better, but too much separation is not helpful.

Cautions:
1) Make absolutely sure you aren't going to interfere with existing repeaters.
    Check with the link frequency registrar for your area. He is usually part of the
    repeater coordinating body for your state. Since link frequencies are usually
    kept confidential by the owners of a repeater with remote inputs, it's way too
    easy to accidentally step on someone's remote input link. I know because this
    happened to us one time. We thought we were operating using a low profile,
    but we were inadvertently bringing up, and being heard by a repeater in a
    county 40 miles away. Oops! Don't be THAT guy!

2) Unless you have some kind of controller operating to automatically ID your
    system, the users will have to ID the system as they use it.

3) Check with your repeater coordinating body to make sure you aren't on
    an existing repeater frequency. When we would setup for our event, we
    used to file a temporary coordination for the pair we were using. We were
    good for 2 weeks prior to the event through 2 weeks after the event. This
    was to give us some leeway as to when we setup and dismantled our
    temporary cross-band repeater.

Some people really seem to have a high level of disdain for their local
repeater council. Sometimes they CAN seem to be a pain in the butt. But
they're doing a job, and they are a resource for you to use. Work with them,
and they can make your life MUCH easier.

73 de N8AUC
Eric
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