Anyone have any MICOR base manuals? C73RTB

[Elroy Jetson]

I'm having some trouble with a Micor base that's not talking properly with the remotes connected to it.

Frankly I'm not all that well up on remotes anyway. I THINK they're DC remotes.

The base transmits and receives fine. The remotes hear what the base receives. But the remotes can't
make the base transmit. From the local metering panel, or from the TX switch on the control card,
it DOES transmit. And also it has a CW ID card (aftermarket) in it which does cause the base to ID
on plug-in and at regular intervals.

The base was in this system before but the PA flamed out (literally) and I repaired it with a new PA deck
and put it back into service. Nothing else of any note has changed but for this problem now.

When in intercom mode on the metering panel, I can communicate with the remotes.

I'm suspecting the line driver card. But some manuals that cover remote operation would be very helpful.

Elroy

[Bruce1807]

There should be a board called DC control if they are DC remotes.
If it is tone there will be a gaurd tone board and an F1 board, both with reeds.

If they are DC put a current meter in series with the line and see if the current changes when they key. That will eliminate the consoles.
Afraid I dumped my micor manuals years ago.

[MetroMan]

If they are DC remotes the polarity is important on the old stuff too. Try reversing the phone lines.

[Elroy Jetson]

There is a line driver card installed and also a DC transfer card.

The remotes are connected to the L1+ and L1- screw terminals on the bottom edge of the control deck backplane.


The station only has three cards in it: Station control, line driver, and DC transfer.

The intercom function on the centralized metering and test panel allows me to communicate with the remotes, both ways.


I'm suspecting the DC transfer card, or the line driver.

Elroy

[n5tbu]

The line driver card only drives audio in the phone line,the dc card handles the plus and minus currents that do functions to the station. The polarity is important! If I remember correctly,+5.5 Ma keys on F1 and -5.5 Ma is a monitor condiction,but I also admit to being rusty on DC control!
I should also add that if you are actually using phone company leased lines...take a remote to the station,hook only it to the station,if it works,then you have a phone line problem,report the circuit number for repair(and wait for all the bull!!!)They can never fix it till they get a man at each D-mark point,and even then you will have to educate them on how a radio circuit works!(well here in south louisiana anyway)
mod

[Bruce1807]

They can never fix it till they get a man at each D-mark point,and even then you will have to educate them on how a radio circuit works!(well here in south louisiana anyway)

Thats a universal problem.
I had problems in Australia , Europe and ME and now here.
It's just how phone companies work.
I will suddenly come good and it wasn't their fault but it is always your equipment

[Jim202]

I would be surprised that there are any DC control circuits still in service. Most of the phone companies
have long since taken them out of service. The copper is much too valuable to only have one user per
pair. Now most of the circuits are converted to tone control and go through multiplexers. This allows
multiple audio to be sent over each pair of wires.

Jim

[n5tbu]

In Louisiana,they have discotinnued DC circuiits unless you are an existing customer...or a Public safty org.
Really glad to know the phone companys problems are everywhere,I thought it was only me having the problems.
Oh and if you tell them you found more than 10db of loss with your Simpson 260.....look out!
mod

[Elroy Jetson]

In this case, the remotes are in the same building as the base station. And no farther than that. It's strictly an in-the-building remote setup that doesn't use an actual phone line per se. Just some phone wire.

It's all old stuff in there. Except for that nice shiny new Motorola MTR2000 repeater.

Elroy

[Jim202]

You still haven't been able to tell us if you have a DC control or a tone control system
there. Give a hint and then maybe you can obtain some help.

A simple way would be to put a butt set across the control line at the remote console
end. If you hear a series of fast tone bleeps and then a steady low level 2175 tone,
then you have a tone remote system. If you don't hear any keying tones, then you
need to put a current meter in series with one side of the pair of wires. If you luck
out on the first try and get the polarity right, I would expect you to see 5.5 to 6.5
ma of current. Depends on who set it up. Anything other than that is a problem.

Jim

In this case, the remotes are in the same building as the base station. And no farther than that. It's strictly an in-the-building remote setup that doesn't use an actual phone line per se. Just some phone wire.

It's all old stuff in there. Except for that nice shiny new Motorola MTR2000 repeater.

Elroy

[Bruce1807]

The station only has three cards in it: Station control, line driver, and DC transfer.

I thinks werve concluded its dc Jim