Thanks Jim! You managed to re-fire an old, unused neuron: Dispatch Console!
I think there may be one, or parts of an old one in storage somewhere. If I rember correctly, they will interface to nearly anything thanks to a diode and jumper matrix and a mess of relays. Probably be the only thing left working after an EMP event! :-) Then there's always the prospects of Frankensteining an older CallDirector(tm) set. It appears that the county will also be swapping out fairly new Moto remote bases with new units that can simulcast so there may be a remote simplex base or to going into the mix too. Now all I need to come up with is a fail-safe interface for use at the repeater sites. Want to keep it simple and NOT have to get to the innards of the controlers. Just want to break and tap the xmitter PTT and audio lines and be able to route them down and back up the "pipe" on command (my remote PTT). Sounds like another job for a good old relay! After 35 years with AT&T, you would have thought I would have remembered my "roots" all by myself. Thanks! Bill - WB1GOT --- In [email protected], "Jim B." <[EMAIL PROTECTED]> wrote: > > Bill Powell wrote: > > I have an opportunity to establish remote control for several of our > > ham repeaters that are co-locates with our county microwave system. > > There are plenty of "spare" $W E&M channels available with the switch > > from an analog to a digital system. > > My objective is to remove a little RF from our RACES room and > > consolodate the current mess into something simple. > > Ideally, I can hack together a simple pushbutton operated panel: push > > to select a particular repeater. Think of the old office phones. > > Anyone out there doing this? > > Suggestions? > > Traps? > > Well, you will want to use the E&M part for PTT and you can also use the > reverse path for a COR-based activity indication. Just remember it's all > 600 ohm audio, keep levels down so that the max level that can possibly > be generated is roughly under 0 dBm, but above -20. And the E&M is > referenced to MINUS 48 volts, so watch your grounds and BE CAREFUL! > It'll knock ya on yer butt if yer not. > > You won't really need to "switch" between rptrs. Bring all the audios in > to a mixer, with maybe volume controls for each, or try to invent some > sort of select/unselect arrangement like is done with dispatch consoles. > Then just have a row of pushbuttons for each PTT, mic audio can be > connected to all through it's PTT switch (actually a relay would be more > reliable). You can even get ingenious and 'patch' repeaters together > on-the-fly! > > -- > Jim Barbour > WD8CHL >
