At 06:59 PM 2/23/05, you wrote:
>My thanks to all for the input!
One item I forgot to mention...
You could put a extra PL decoder on the local RX, and wire it to a
multipole relay that bypasses the voting system completely.
Picture a scenario where the voter fails. The entire repeater
system is dead. The users switch from 100.0 to perhaps 103.5 and
the main receiver pulls in this relay. The armatures are hooked to
the repeater controller audio in, COS in, PL decode in. The normally
closed is connected to the voter out. The normally in is hooked to
the receiver. This way you at least have a local in-cabinet repeater.
And yes, you could use a chip-based switching method, but a relay
is simple, and it shouldn't get much use anyway.
>Our club repeater (W5UK/R 444.2) is currently a Mitrek converted to
>repeater service with a homebrew WB2WHC voter (GE MDX as 2nd rcvr).
>The plan is to recycle the homebrew voter to our 6M machine and
>replace it with a pre-made multi-channel unit (probably the LDG since
>the budget is tight).
Don't give up on the better voters.
GEs are out there, and not too expensive.
>We'll use MDX's (gotta shelf-full) as voter rcvrs
If they have discriminator audio outputs, COR and PL decode logic
levels they should do fine.
>and Mitreks (another shelf-full) for the remote links.
Keep the power level down to the point where they stay cool
and you will be OK. Read my Mitrek interfacing article again,
I['ve added info to it in the last few months (especially the
Motorola method of adding a separate TX antenna jack)
>As I said
>before, we'll run "flat" audio throughout; I'm currently building
>limiter boards for the main repeater and the links.
Have you seen the one designed by Kevin Custer W3KKC?
Check out www.repeater-builder.com/products/audioprocessing.html
>Our geography here is flat, flat, flat and the repeater is mounted
>500' up the WWL-TV tower, so we're hoping that with a boost of output
>power (currently only ~20 watts) and some strategically place
>satellite rcvrs, we can solidly cover the metro New Orleans area and
>get rid some problem spots.
Can you put the TX at the antenna level ? I've done one system
on a tall tower and we discovered that #8 AC wiring and audio coax
was much cheaper than heliax. No sense in using half to 3/4 of
your RF power to heat the coax.
When it comes right down to it, once the system is in service and
burned in, how often do you actually need access to the TX ?
>Again, thanks for all the expertise!
Best way to say thinks is to help others.
Take pictures as you build your system, and when you get
it working, write an article for repeater builder.com !
>73 de K5IQ
>Bob
Mike WA6ILQ
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