"Bob Bob" wrote in message
...
Aghh, good old wombats!

I'd suggest that any adjustable gain isnt going to help much. I'd
concentrate more on your statement "This system was used previously with
no problems". Do you have a breakage somewhere? Are the troublesome
systems on one receiver? (if you have more than one) Are you sharing the
frequency with someone else and getting interference? Are there any other
sources of interference that may be the problem?

I suggest that horizontally is the best orientation as the antennas on the
animals are probably also horizontal.

In my situation I'd also tune the equipment for best output just in case
the attached wombats have damaged them. You *could* put a preamp on the
receiver but I think that will invite more problems than provide a viable
solution

If you have a scanning receiver have a listen separately for each collar
signal. If they are all there suspect the base anytenna/receiver as being
faulty. You may also hear interference.

Hope this helps

Cheers Bob VK2YQA

Krys wrote:
I have a telemetry system set up so I can have radio collars on
animals (wombats) which transmits to a directional Yagi 3 antenna and
through to a TR-5 Telonics receiver. I am getting activity data now
directional data.

-------------

All of what the respondent said, plus:

Was the coax leading to your base antenna weatherproofed using coax seal at
the outside connector? If not, it is possible that rain water has
contaminated the coax leading to your base radio. I've seen this type of
problem cause folks to pull their hair out while trying to "fix" all of the
remote units, when it was the base unit all the time.

What kind of connectors are used in your base system? If N-connectors it is
unlikely that the above problem is the cause. However, it is also unlikely
that your system is using N-connectors because of price considerations.

A passive radiator system (antenna inside structure connected to an antenna
outside of the structure the Wombats occupy connected by coax cable) could
help. But I would find out why the system is not performing as it was
before. As the respondent indicated, it could be something as simple as Tx
detuning or increased traffic on the frequencies that you are using.

Ed, NM2K