Batboard

Hello,

Thank you to all that have helped us so far. You guys are great! Now I need a little more help.

Some months ago the FD I am a member of, acquired an older Micor base station repeater. We went through the FCC and got licensed for a repeater channel, and luckly received two wide-band frequencies for it. We had the existing channel elements recrystalized and the duplexer retuned. Works great thus far. Now we are wanting to expand our project. Currently the unit has no PL receive or transmit, and as you may expect, we occasionally hear other users. We had someone donate us a Multi-PL decode board with 1 Vibraponder tone (146.2) in it.

There is no slot labeled Multi-PL and I was wondering which slot this card would insert into, and would it require jumper changes?

Our next progect is to add a transmit PL to the Micor. Would this require a Multi-PL encoder or can we pull a PL board out of an old Micor mobile and place in the transmitter portion of the radio?


Thanks for any and all help!

Your better off getting something like a Commspec TS-64 and wire it in, its not that difficult and they have full hookup info available for the Micor and most other Moto radios. We had "issues" with a Micor repeater here, those tone reeds are not as reliable when they get old, or at least that was the general opinion. It would false a lot and let interfering signals trip the repeater.

Better to spend the small amount of time and money and make the PL encode and decode solid state!

http://www.com-spec.com/ts64.htm

You plug the board into the decoder slot that's to the left in the control shelf.

If this is a non-secure base, that slot, as well as the encoder slot will be there. If this is a secure station, you are out of luck because those slots don't exist in a secure station.

I don't have a manual in front of me and someone who does can help out here, but the matrix board goes where the 4F control board goes.

The idea is this: You can encode and decode with two boards, but the idea is that the matrix board selects which tone is used by tone remote command OR by what the received tone is. This is determined by a diode matrix that allows such things as duplicate codes, cross codes and other things.

You can't have both four freq control AND multiple PL in one base. The slots get used with one or the other.

This makes a single user Micor station work as a poor boy's community repeater that has up to four seperate users.

The proper thing to do is to change the station into a PL based station with AND squelch. This means removing two jumpers on the receiver interconnect board and adding two diodes and a 10K resistor. The instructions on the receiver interconnect board manual pages.

One jumper needs to be removed on the station control module that is the PL/CS jumper. I want to say it's JU10 or JU9, but I don't remember for sure. It's in the manual.

The other thing is a jumper needs to be added from the transmitter interconnect board to the exciter. This takes the PL tone from the shelf into the exciter.

Be sure to set the two jumpers for CS/PL in on the squelch gate to the PL position.

I think I have covered it all IF you are going to use the decoder board.

Really I think you should get a base station decoder and put it on the audio and squelch board with the little bracket mounted in the receiver chassis area. You have to set the jumpers on the A&S board for PL.

Keep in mind the decoder is NOT the same for a base verses a repeater. If you try to force a mobile board in a base, you will burn up some stuff because the pins are too long and touch other components on the board.

If you get an encoder for the exciter, just remove JU401, (I think) and plug in the PL encoder.

This is the easiest way to apply PL to a station, but I would still make it AND squelch. It will be best in the long run.

I am surprised you were given a repeater pair without a requirement for PL. This just doesn't sound right.

I am not completely awake at this point so sorry for the ramblings, but these have been the basics of the method for converting a CS base/RT to a PL base/RT and including MPL. It's a bit complicated, but I have done this several times and it works fine. If needed, I may have some parts for this, but I will have to get things out of storage.

George

It's a LOT easier to wire in a modern encode/decode board and be done with it.

Or you can go through all that crap and have a reed fail and be back to square one, which i have seen happen.

If you are interested, I may have the complete set of cards to do PL and DPL along with some PL and DPL modules from a Micor community repeater. Don't know if I have 146.2 though. Let me know if you are interested. kb0nly is correct in using the com-spec board, allows you to change codes easily.

Dave

The boards from a community repeater are not compatible with a single user repeater. Too many differences.

George

There a 3 versions of unified chassis control shelfs. Only the community repeater shelf has a card on the control shelf itself. On most stations the PL board goes on the transmit exciter for tx and in the redeiver for receive. My suggestion is to get an after market repeater board and install that. This way you have TT control of it, cross pl's if you want and DPL which as far as the Micor goes was very rare, except on 800 mhz.

I beg to differ.

Yes, there were three backplanes for the Micor station.

However, the standard single user does support a multi PL option.

This option consists of three boards and is used in the three slots to the left. The three boards consists of an encode board, a decode board and a matrix board.

This set of boards was intended for tone remote controlled multi PL base or repeater operation. I have installed this three different times and have these very boards out in my garage. If this is used in a repeater application, you can make a four user repeater out of a single user station.

Once I get my stuff unpacked, I'll even post the part numbers.

This DOES exist because I have it.

The community repeater boards are different.

George

In fact, there is a matrix module on Ebay right now.

It's listed as Micor Maxtrix control module