is ANYBODY knowledgeble with Desktrac?

[jim]

I tried here several times, but nobody answered. I'll try again!!!

I have a lowband Desktrac and need to do several things.

1. Add external speaker (which plug?)

2. Add an external relay to be triggered upon tone activation (aka external alarm)

3. I need information on the telephone interface board that mounts under the radio.
It has an RJ-45 8-pin output to the wall jack. Only 2 of the 8 are used. Which 2 of the RJ45 go to the phone service line?

4. There is a rotary switch on the front panel (thru the hole) What does each position do and where should it be set during normal operation.

5. There are 2 DB25 connectors on the rear. What are they for? The lower has a ribbon cable running to the tone (phone) board.



This unit is being installed at my FD as a remote receiver link via phone line and I'm having some trouble getting the link established. I've alway been a "mobile" type guy with the business and do not get much experience with this type of installation. I can't even find a local shop with e service manual.

If anyone can email me direct, I'd appreciate it!

Thanks
[email protected]

[GMC]

Here you go

1. Add external speaker (which plug?)

See below

2. Add an external relay to be triggered upon tone activation (aka external alarm)

See below

3. I need information on the telephone interface board that mounts under the radio.
It has an RJ-45 8-pin output to the wall jack. Only 2 of the 8 are used. Which 2 of the RJ45 go to the phone service line?

Pin #1 - Line #1 Tone or DC+
2 WireTx/Rx or 4 Wire TX
Pin #2 - Line #2 Tone or DC-
2 WireTx/Rx or 4 Wire TX
Pin #3 - Line #3
4 Wire RX
Pin #4 - Line #4
4 Wire RX
Pin #5 - Busy
Pin #6 - Busy Gnd
Pin #7 - Data +
Pin #8 - Data -

4. There is a rotary switch on the front panel (thru the hole) What does each position do and where should it be set during normal operation.

Selects Communications Path
Position # 1 - Selects the Transceiver
Position # 2 - Not Used
Position # 3 - Remote Control Option

If the Max Trac RSS is being used, the
selector must be turned to pos #1.

If the Desk Trac RSS is being used, the
selector must be turned according to
instructions displayed on screen

5. There are 2 DB25 connectors on the rear. What are they for? The lower has a ribbon cable running to the tone (phone) board.


Top One is Accessory #3

Pin # 11 - Speaker Audio Hi
Pin # 24 - Speaker Audio Hi
Tie Together
Pin # 19 - Speaker Audio Lo
Pin # 18 - Speaker Audio Lo
Tie Together
Pin # 9 - Emergency Switch
Pin # 19 - Emergency Switch

Bottom One is Acessory #2

Pin # 1 - - GROUND
Pin # 2 - - No Connection
Pin # 3 - Out - B+ 13.8 VDC @ 750mA
Pin # 4 - In - PTT TEL - Active Low
level keys the Tx
with audio from pin #5
Pin # 5 - In - MIC TEL - Transmit
pre-emphasis audio,
provides 3KHz dev to
1KHz tone at 150mV rms
Pin # 6 - - GROUND
Pin # 7 - Out - DRXA TEL - Filtered
and de-emphasized
receive audio output,
provides 600mv rms to
a 1 KHz tone at 3 KHz
Dev.
Pin # 8 - - GROUND
Pin # 9 - Out - CHANNEL MONITOR -
Carrier squelch
indicator output,
active low
Pin #10 - Out - B+ 13.8 VDC @ 750mA
Pin #11 - Out - EXTERNAL ALARM (H/L)-
Active high output for
6 sec when Call Alert
is received (prog I/O)
Pin #12 - Out - PL CHANNEL MON - Code
Squelch (PL/DPL)
indicator output,
active low.
Pin #13 - In - PTT - Active low level
keys the Tx with flat
transmit audio from
input pins #22 & 17.
Pin #14 - Out - LINE PTT - PTT output
from line control
board (if used)
indicating line
activated PTT (active
low).
Pin #15 - Out - DRXA EXT LOCAL -
Flitered and de-
emphasized receive
audio output,
provides 1V rms to
received 1KHz tone,
modulated at 3 KHZ
deviation.
Pin #16 - In - TXA EXT LOCAL - Tx
pre-emphasis audio
input, provides 3 KHz
deviation to an input
of 1 KHz tone @ 500mV
rms.
Pin #17 - In - TX CTCSS - Transmit
CTCSS input, provides
3 KHz dev to an input
of a 1 KHz tone @ 330
m V rms.
Pin #18 - In - MONITOR - Mom input
to unsquelch Rx
Pin #19 - In - PTT EXT LOCAL -
Active low level keys
Tx with audio from
pin #16
Pin #20 - - No Connection
Pin #21 - In - TX PL INHIBIT - Tx Pl
and DPL inhibit input
active low.
Pin #22 - In - TXA - Tx flat audio
input, provides 3 KHz
dev to a 1 KHz tone @
330 m V rms
Pin #23 - Out - RXA - Received flat
(discriminator) audio
output. Provides 330
m V rms, to a
received 1 KHz tone
modulated @ 3 KHz dev
Pin #24 - In - PTT PAGER - Active
low level keys Tx with
audio from pin #25
Pin #25 - In - MIC PAGER - Tx pre-
emphasis audio input,
provides 3 KHz dev to
a 1 KHz tone @ 120 m V
input.


Hope this helps
Gary

[jim]

Thanks a lot! NOBODY on this forum ever is able to answer questions about this "Max in a box." If you read this, print it out !!!

[kv6o]

Looking for the same info for a UHF Desktrac - trying to see if I can interface an CWID thru the DB25. Looking at the list posted by Gary (some years ago now!) and comparing it to what I have, it doesn't seem to match. I found 13.8V on a different pin, PL Channel mon on another, all by experimenting. Can anyone help?

Thanks!

Steve
KV6O

[xmo]

Desktrac service manual 6802993G65

MOL or 1-800-422-4210

[kv6o]

I tried looking on motorola's website, no luck. I tried calling the number given, and after spending about 5-6 min trying to navigate the menus (which had zero options that sound right), i got disconnected! Searching online I found a dealer who has one - for $130!?! Is it that hard just to get a pinout?

Thanks!

Steve
KV6O

[chartofmaryland]

Yep, the desktrac manual is pretty steep

Just checked on MOL with an account,



Oh well,

CoM

[Will]

We have a DeskTrac manual here. It is a large manual. I may be able to help when I get a few min's.

[xmo]

"...Is it that hard just to get a pinout? "
--------------------------------------------------

The previously posted pinout is correct. You are having issues, hence the recommendation to get a manual.

You said you checked Motorola's "website"

motorola.com is not MOL. If you don't have an account on MOL, the 800 number should work.

BTW, the MOL price is not outrageous:

1. Item Number. 6802993G65
SERVICE MAN, Unit of Measure: 1 EA
Lead time (days) 2, Available Y, Your price 65.45

It looks like your local dealer figures on 100% markup.

[kv6o]

Thanks for your help - I'll see what I can do with what I got here....

Steve