Batboard

Working on an MSR2000 VHF, T4-4R config.
I'm looking for the part number and backplane pin config for a 2nd line driver for F3 / F4. The part number isn't on the board, and the manual I have doesn't even mention F3 / F4 possibilities. (yes both station and audio manuals.)

Goal: Mute F3 with closure to ground via backplane pins. Tried ground to pin 9 to no avail. However, it may be a jumper config issue. Since I don't have the module specs, I can't tell..

Thanks.
tpg

You indicate a T4-4R configuration which in Motorola speak means a four frequency transmitter and four discreet receivers.

That would have been an SP configuration - your station model number would have an SP suffix like SP151. The wiring changes for that station configuration would be contained in SP supplemental documents.

I might have an old base station custom price book that would list the actual sp number for the T4-4R MSR configuration - but I doubt if it will list a part number for the manual supplement - I'll check later.

Update:
Went to another site with the same exact set-up, T4-4R:
C73KSB3196B-SP331
Module in Question: QRN-4263A ("Second Line Driver Module)

Yet the manual still shows no reference to a QRN-4263A... DAMN IT!

(Still looking)

tpg

xmo is correct, what you are trying to duplicate is a 4 Frequency Transmitter Base Station with 4 separate Receivers. The first is a included with the Base Station, the 2nd is installed in the same base station chassis and the 3rd & 4th receivers are installed in a separate SP chassis that requires a seconarey interconnect backplane and a Secondary Line Driver. The SP Manual that you should be looking for is as follows:

001S-SP5823513 OR 68-06908K47 The SP Manual is always a supplement manual to the Standard Service Shop Manual and never the twains shall meet. SP indicates it's a Specialty Product that original required a SP Bid & Quote on the order so it could be developed and sold to a customer. Some times these SP Options were sold as Field Modification Kits but not always.

Good Luck

Dan

I know what the radio is, and I'm not trying to duplicate it. I've worked on them before. What I'm looking to do is a special circumstance where I need to mute F3 (preferably just do a "line driver disable") with a pin to ground config off the backplane. I just need to know the backplane pins for the second line driver to mute F3. I don't have the SP manual, and the part # you gave is NLA from M.

Looks like I'll just do a 12V relay set-up. Screw doing it the legit way....

tpg

Pager Geek,

I guess I misunderstood your requirements and why you could not find the SP modules in the Standard service manual. Any module Motorola manufactured up to the Quantar / MTR2000 series Base Stations that were not used in a Standard configuration would never show up in any Standard manuals. This is why I went out of my way to research what the SP manual numbers were and provide them to you.

I have no control over any decisions that Motorola has made in the last 76 years of existance, zip, zero, none. I have been in your position as a field technician throughout my career and sometimes you've got to do what you have to do to please the customer. Sometimes the end user expects miracles, that is to repair or modify the equipment without removing the primary power and we all know that's impossible.

You seem to be stressed out with your technical problem. Since I do not have a Micor Slightly Revised 2000 service manual at my home, "Have you removed both modules and performed a visual comparison between the two boards?" If they look the same, they could be the same. And then you could use your Standard manual for the routing of the Mute signal. Possibly there's something so simple as a missing JU Jumper not inserted on the QRN4236A Secondary Line Driver Module therefore not allowing the DC ground signal to Mute the receiver's Wire Line # 3 on Transmit.

There might be one or two other alternatives to consider. Depending on the Console your customer is using, you might be able to Cross Mute the third Wire Line Audio Signal at the console ... it's just a thought. Since you now have the SP manual numbers, have you considered calling the Schaumburg's System Support Center's 1-800-448-3245 & asking there technical staff to FAX out a copy of the SP service manual to you? BTW, the IDO service personnel may have a copy of this SP manual.

Well as I said before, "Good Luck" on resolving this service request!

Dan

Sorry if I seemed blunt. I'm not much of a talker, as most of my posts reflect.

Here is the total issue:
New Quantar transmits on F5 which cause the MSR2000's F3 to open squelch. (Neighboring channels with common PL)

Open squelch goes to PA system throughout the building. (Complaint)

A tech previous to me ran a mute line from the console to the second line driver. That made it worse, not better. I'm assuming wrong pin or wrong jumper config. I can't tell because of lack of documentation available.

Solution:
CR107 on F3's PL card was lifted to allow full duplex (full-duplex not required, customer ok'd not having it.) I used this to emulate "Keyed A-" with closure to ground via the mute line. When the console TX's (Quantar), it makes the PL card think the MSR is transmitting. Documentation for PL card available, so it took a few minutes.

Just had to look at the answer from another angle... problem solved.

As for system support, I've found it hit or miss for people who have a clue / helpful. I use them as a last resort. Tomorrow I would have been calling had I stumped myself.

Thanks for looking up the SP manual number.

tpg

Pager Geek,

Now I understand the frustrating problem, very little documentation on the box and the co-located systems / RF channels. Lucky I wasn't out there ... I might used some colorful language as to who sold the Multi-Frequency Quantar with F5 so close to MSR2000 F3. Probably a sales person who barely knows how to fill out an order form!

You certainly stopped, backed up far enough to re-evaluate how to solve the problem and it appears to work fine.

"We the willing, lead by the unknowing and ungreatful, have been doing the impossible for so long, with so little, it is now possible to do anything with absolutely nothing!" Author Unknown.

I've just got to ask this question .... I know you're going to shoot me but, What if the MSR2000 F3 receiver becomes active with emergency voice traffic sending recovered audio down the wire line, then the Quantar's F5 becomes active simultaneously and the Console's dispatcher Keys Up on F5? I have a feeling a couple of antennas on a roof or tower might be too close to each other.

If your answer isn't what you might have overlooked .... you can find me over in front of the Public Safety Firing Squad with a blind fold on waiting.

Dan

Well... from the time I wrote the last post, I found another way to solve my problem. BUT...

It's a single position, conventional, Gold Elite CRT. The console had already been crossmuted to mute all the problematic "open squelching" from the console. So going a step further to hardware mute it was not a procedural concern. What DIDN'T happen was the PA system interface muting. Although the squelch was removed from the console, it still went thru the PA system to the remainder of the building. So a hardware mute was the only option.

I ended up scratching the hardware modification plan. (Still completed, but not connected at this time.) My area is transitioning to narrowband with DPL.
Current steps over the past 15 years:
1- 911 = RX PL / TX PL
1- Agencies = RX PL / TX PL

Found out PURC + QuikCall 1 and QuickCall 2 + PL = Bad
2- 911 = RX PL / TX CSQ
2- Agencies = RX CSQ / TX PL

Transition to move to DPL due them using the same PL for EVERY channel and interfering with each other (current config):
3 - 911 = RX PL&DPL / TX DPL
3 - Agencies = RX CSQ / TX PL or DPL

To complete to new narrowband
4 - 911 = RX DPL / TX DPL
4 - Agencies = RX DPL / TX DPL

I know you're scratching you head... it's a little messy, but it's how we do it.

ANYWAYS, it dawned on me when I wrote my last post "neighboring channels with common PL." 911 just began multi-PL receiving almost a year ago. The problem I got assigned has been going on for 2 years (and now it's a crisis, of course.) If I changed the F5 TX PL on the Quantar to DPL, perhaps the MSR wouldn't see the similar F3 PL riding with the F5 channel interference. So I did. That also solved it. ONLY 911 has closed PL/DPL, so we get to listen to EVERYBODY on the same channel... even in the next few states too.

Joy...

Thanks again
tpg