Midland Syn-Tech 70-342XL User manual

VHF (WIDE BAND)
SERVICE MANUAL
LAND MOBILE RADIO bUVUUU
1690 North Topping Avenue
Kansas
City, Missouri 64120
MANUAL NO. 70-342442
09-342/442 XL
SM-8/86-1.5M

PREFACE 70-342~~/442~~
This service manual is intended to facilitate set-up and service of
the 70-342XL and 70-442XL transceivers. In the first section of this
manual, after transceiver description and specifications, instructions
,
for transceiver preparation are found-- programming, calibration, ir-
stallation, and summaries of available support equipment.
The second section of this service manual, entitled SERVICING,
is
dedicated to transceiver repair. Troubleshooting flow charts for
locating likely problem
areas are in the beginning of t-his section.
General information follows, such
as chip component identification and
replacement instructions and realignment procedures.
Transceiver circuitry
is contained on three PC boards and categorized
herein respectively. Each PC board
is detailed in text, charts, and
diagrams;
all of which can be viewed with their respective schematics.
Each schematic page has
a list of other applicable diagrams that can
be vi.ewed with
it.
Because the PC boards have components and plating on both sides,
layout diagrams show superimposed images of plating patterns and
respective other-side-component maps. Any double-image layout of the
three PC boards can be viewed with their respective schematic without
turning pages.
Information in this book
is focused on the basic transceiver. Because
of the variety of readers' requirements, details of option add-ons
are not included. A divider at the end of this book, entitled
OPTIONS,
is provided for allocating technical literature acquired with
each add-on kit.
As necessary, service manual supplements will be published and distri-
buted on the following forms:
Manual Addition (MA)
..... For supplemental information useful in
product alignment, service, or improve-
ment. Printed on BLUE paper.
Change Notice (CN)
...... For circuitry change details made during
production by model and
serial number.
Printed on YELLOW paper.
Manual Correction (MC)
... For correcting literature errors not
related to production changes. Printed
on GREEN paper.
Technical Bulletin (TB)..For solutions to field problems and tips
for performance improvement. Print.ed on
PINK paper.
Many useful facts and tips
are provided in the text. If the reader
intends to service several of the transceivers described herein,
spending
time to read applicable text will save time in the end.

TABLE OF CONTENTS 70-342~~/442~~
PAGE
Preface
................................................. ii
Table of Contents
....................................... 1
............................................. Description 3
Specifications:
General
............................................. 4
Transmit ............................................ 5
Receive ............................................. 6
Scan and CTCSS ...................................... 7
ElPROM Programming:
Programmable Parameters
............................. 9
......................
H1 Version Programmer Software 10
ElPROM Module Removal
............................... 10
Programming
......................................... 11
Transceiver Calibration:
Set-up
.............................................. 18
Error Codes
......................................... 19
...........................................
Procedure 20
Installation:
........................................
Instructions 22
............................
Under-Dash Configuration 24
Trunk-Mount Configuration
........................... 25
.....................
Under-Dash Power/Accessory Plug 26
...............
Trunk-Mount Power and Accessory Plugs 28
........................
Automotive Receiver Interference 31
Optional Accessories
.................................... 35
.......................................
Service Equipment 37
Service Tools
........................................... 38
............................
Optional Feature Add-on Kits 39
SERVICING
Troubleshooting Charts:
............................................. General 45
CPU/Phase-Lock-Loop
................................. 46
Transmitter ......................................... 47
Modulator
........................................... 47
Receiver ............................................ 48
Component Replacement:
Chip Component Identification
....................... 49
.....................
Replacing Components with Leads 50
Chip Capacitor and Resistor Replacement ............. 51
Complete Alignment:
.............................................. Set Up 53
Error Codes
......................................... 55
Realignment
......................................... 55
.....................................
Factory Presets 60
continued ......

SERVICING continued:
Circuit Analysisf
Transmitter Board
................................... 61
Microprocessor Pinouts Chart
........................ 63
RF Power Amplifier Board
............................ 69
Receiver Board
...................................... 71
Simplified Squelch Circuit Schematic
.................... 75
Metering
................................................ 76
........................................... Block Diagram 77
Under-Dash Circuitry:
Under-Dash Interconnect Diagram
..................... 78
Front Panel Schematic Diagram
....................... 80
Front Panel PCB Layouts
............................. 81
70-342XL/442X~ Receiver PCB Layouts ................. 82
DC Voltages
- Receiver Board ........................ 83
70-342XL Receiver Board Schematic Diagram ........... 83
Trunk-Mount Circuitry:
Trunk-Mount Interconnect Diagram
.................... 84
........................................
Control Head 85
Control-Cable Interface Board ....................... 86
........................
DC Voltages - Receiver Board 87
70-442XL Receiver Board Schematic Diagram
........... 87
Transmitter Board:
.....................
DC Voltages - Transmitter Board 88
............
Microprocessor Pinouts (Duplicate Chart) 89
.......................
RF Power Amplifier PCB Layout 90
................................
E/PROM Module Layout 90
.............................
Transmitter PCB Layouts 91
Transmitter Board Schematic Diagram
................. 93
..................... Under-Dash Exploded Mechanical View 94
............................... 70-2301 Microphone Detail 95
.............................. 70-2195 Hang Up Box Detail 95
....................
Trunk-Mount Exploded Mechanical View 96
..............................................
Parts List 97
..........................................
Parts Ordering 109
OPTIONS
...................

GENERAL DESCRIPTION 70-342~~/442~~
The MIDLAND SYN-TECH 70-342XL and 70-442XL VHF wide-band Land-Mobile
transceivers are mobile two-way radios designed to operate on FM
channels between 136 to 174 MHz. There are two varieties of the SYN-
TECH 70-342XL and 70-442XL transceivers, each designed to operate on
a
different channel frequency range: the A-band radios (70-342AXL & 70-
442AXL) on the 136-163 MHz range; the B-band radios (70-342BXL
& 713-
442BXL) on the 148-174 MHz range. SYN-TECH transceivers have the
capacity to operate on up to eighty operator selectable channels, each
of which can be programmed in the service shop.
The SYN-TECH 70-342XL transceiver
is configured for under-dash mount-
ing.
It has a control knobs, push buttons, and display all on a front
panel for easy access to the operator. The SYN-TECH 70-442XL trans-
ceiver
is configured for mounting in a vehicle trunk or other remote
location.
It does not have front panel controls; instead it has a 34-
pin receptacle in its face-piece. The receptacle accepts the 4-meter
long Control Cable that interconnects the 70-442XL remote unit with
its Control Head. The Control Head contains all the operator controls
and
is much smaller in size for mounting where accessible by the
operator.
As the SYN-TECH 70-342 and 70-442 transceivers, the XL models are
wide-band radios. Electronic tuning of critical stages
is used to
allow them to operate over a 24 MHz spread of channel frequencies.
The XL models are revised 70-342 and 70-442 transceivers that used
5
KHz for their main VCO comparator frequency. The 70-342XL and 70-
442XL models use 2.5 KHz, thus allowing channel frequency increments
of 2.5 KHz for half-channels.
Many optional features, such
as CTCSS, can be added at the factory.
Complete add-on kits for field installation are readily available.
A
listing with brief kit descriptions can be found in later sections.
Operating parameters such
as channel frequencies, CTCSS frequencies,
and a variety of feature timing and codes
are electronically contained
in an alterable memory module for easy customizing. The plug-in
memory module
is reprogrammable in the service shop using the MIDLAND
E/PROM Programmer.
The 70-342XL and 70-442XL transceivers contain three major printed
circuit boards. The Transmitter Board contains transmitter, synthesi-
zer, and microprocessor control circuitry.
It lays horizontally, with
components facing up, on the top side of the chassis center divider.
The Receiver Board also lays horizontally, but on the underside of the
chassis divider with components facing down. The third PC board
is
the RF Power Amplifier Board located inside the rear heat sink. It is
accessible by removal of the heat sink top cover.

SPECIFICATIONS 70-342~~/442~~
GENERAL
OPERATING VOLTAGE: Nominal....
.... 13.6 VDC, negative ground
..........
Range 10.5 to 16 VDC
TEMPERATURE RANGE
..................- 30°C to +60°C
ANTENNA IMPEDANCE
.................. 50 ohms, unbalanced
MICROPHONE
......................... Dynamic element (with amplifier)
FREQUENCY CONTROL
.................. Phase-Lock-Loop synthesized with
EPROM Programming
FREQUENCIES OF OPERATION:
....... Models 70-342AXL1442AXL 136 to 162 MHz
.......
Models 70-342BXLl442BXL 148 to 174 MHz
CHANNEL CAPABILITY: Standard
...... Up to 80 transmit and 80 receive
CHANNEL FREQUENCY SPREAD without retuning:
Transmit....
..... 24 MHz maximum
Receive.
......... 24 MHz maximum
FREQUENCY TOLERANCE
AND STABILITY..+/- 5 ppm both TX and RX (standard)
+/-
2.5 ppm optional
+/-
2.0 ppm'optional
DUTY CYCLE
......................... Intermittent. 1 min TX, 4 min RX
(Per EIA RS-152B)
.....................
HIGH HUMIDITY. 95% at 50°C per EIA RS-152B, sec.13
VIBRATION STABILITY
................ Per EIA RS-152B, sec. 14
SHOCK STABILITY...
................. Per EIA RS-152B, sec. 15
CURRENT DRAIN:
Standby .................... 0.35 ampere DC (max)
Receive..
.................. 1.00 ampere DC (max)
Transmit (40W
@ 50ohms) .... 8.50 amperes DC (max)
DIMENSIONS (H
x W x D):
....
Transceiver (70-342XLl442XL) 65xl88x270mm (2.6" x 7.4" x 10.6")
.......
Control Head for 70-442XL 5Ox88x80mm (2" x 3.5" x 3.2")
............
Speaker for 70-442XL 100x100x77mm (4" x 4" x 3")
WEIGHT:
Transceiver (70342XL1442XL)
..... 3.15 Kg (6.96 lb)
.......
Control Head for 70-442XL 0.8 Kg (1.8 lb)
Speaker for 70-442XL
............ 0.71 Kg (1.58 lb)
--All specifications subject to change without notice.--

SPECIFICATIONS 70-342~~/442~~
TRANSMITTER
Refer to EIA RS-152B and DOC RSS-119-Issue 3 for Method of Measurement
and Standard of Performance.
CARRIER POWER OUTPUT
............... 40 watts minimum,
adjustable from 20 to 40 watts
MODULATION SYSTEM
.................. Phase Modulation
........... AUDIO FREQUENCY RESPONSE Per EIA and DOC specifications
..........
AUDIO HARMONIC DISTORTION 3% THD
(1 KHz tone at 3.0 KHz deviation)
SYSTEM DEVIATION
...................+/- 5 KHz maximum
MODULATION LIMITING
................ Instantaneous peak clipping with
low-pass audio filtering
HUM AND NOISE
...................... 50 dB
OCCUPIED BANDWIDTH...........
...... Less than -60 dB of carrier power
30 KHz outside carrier frequency
TRANSMIT CARRIER ATTACK TIME
....... 100 ms max. for 50% rated power
CONDUCTED SPURIOUS EMISSIONS.
...... Less than 25 uW from 1 to 1000 MHz
MICROPHONE INPUT LEVEL.
............- 8 dBm +/-3 dB at 600 ohms
OUTPUT PROTECTION: Shall withstand withcut damage,
5 minutes of
operation into a 20:l load mis-match with any
standing wave variance.
OUTPUT STABILITY: Shall not exceed spurious emission limits herein
while operating into a 5:l load mis-match with
full standing-wave variance.
--All specifications subject to change without notice--

SPECIFICATIONS 70-342~~/442~~
RECEIVER
Refer to EIA RS-204C and DOC RSS-119 for Method of Measurement and
Standard of Performance.
SENSITIVITY: 12 dB SINAD......
.... 0.25 uV into 50 ohms
SQUELCH SENSITIVITY: Tight
........ 1.0 uV minimum, 2.0 uV maximum
Threshold....0.2 uV maximum or
6 dB SINAD
.................
SQUELCH BLOCKING.. 13 dB
......
RECEIVER ATTACK TIME......... 100 ms
(squelch release)
... RECEIVER SQUELCH CLOSING TIME... 200 ms
ACCEPTABLE RF DISPLACEMENT.........+/- 3.5 KHz minimum
ADJACENT CHANNEL REJECTION
......... 80 dB at +/-30 KHz
.....
SPURIOUS RESPONSE IMMUNITY.... 85 dB
......
INTERMODULATION IMMUNITY..... 75 dB
AUDIO POWER OUTPUT:
Under-Dash Radio (70-342XL)
..... 1 watt at 5% THD into its internal
speaker, or
5 watts 5% THD into a 3.2 ohm
external speaker
....
Trunk-Mount Radio (70-442XL) 5 watts at 5% THD into the 3.2 ohm
external speaker
AUDIO FREQUENCY RESPONSE.....
...... Per EIA and DOC specifications
....... HUM AND NOISE: Un-squelched 40 dB
.......... Squelched 50 dB
.....
CONDUCTED SPURIOUS EMISSIONS.. 200 uV across 50 ohms (800 pW)
from DC to 1 GHz
...........
INTERMEDIATE FREQUENCIES 21.4 MHz (1st) and 455 KHz (2nd)
--All specifications subject to change without notice--
6

SCAN OPTION
Several of these parameters
are programmable by E/PROM programming.
CHANNEL CAPACITY
................... 2 scan groups of 64 each
(duplicates allowed)
OPERATOR CONTROL OF SCAN
........... Three modes selectable by
push buttons
......... PRIORITY CHANNEL SELECTION Any channel selectable by the oper-
ator using the channel push buttons
INDICATION OF PRIORITY DETECTION
... Two-beep audible alert (elective)
KEY-UP CHANNEL REVERT
.............. Transceiver transmits on Priority
channel or last stopped channel
(depending on scan mode selected)
EXTRANEOUSLY BUSY CHANNEL SKIP
..... Channels can be skipped in scan by
DOWN channel selection
PRIORITY CHANNEL SAMPLING RATE
..... Every 4 or 8 channels, or every 1
or 2 seconds during scan hold
SIGNAL DETECTION
................... of carrier presence or vacancy; or
of correct CTCSS tone presence or
vacancy with
carrier
SCAN RESUME DELAY .................. 0.3, 2.5, or 5 seconds or
lock
& hold until reset
SCAN SPEED (with standard timing):
.....
Noise squelch busy detection 20 idle channels per second
CTCSS detection
.................. 3 channels per second if all busy
CTCSS OPTION
CODE FREQUENCIES
................... All EIA standard from 67 to 241.8Hz
..................
MODULATION LIMITS 500 to 1000 Hz carrier deviation
DECODE SENSITIVITY
................. Less than 5 dB SINAD
RECEIVER RESPONSE TIME
............. 200 ms maximum
..............
ENCODER RESPONSE TIME 50 ms maximum
TRANSMITTER TONE DISTORTION
........ 5% maximum
AUDIO DISTORTION WITH CTCSS TONE ... 10%
--All specifications subject. to change without notice--
7

E/PROM PROGRAMMING 70-342~~/442~~
The 70-342XL and 70-442XL transceivers contain an Erasable/Program-
mable Read Only Memory (E/PROM) module. The module holds specific
customer frequencies, feature selections, and other parameters that
determine radio operation.
Before final alignment and check, the module must be reprogrammed with
customer specifics. If any option add-on kits are to be installed,
appropriate parameters may also need to be programmed as instructed in
respective kit installation literature.
To change ElPROM electronic information, the plug-in module must first
be erased by exposing it to ultraviolet light using the MIDLAND 70-
1100/1101 ElPROM Eraser. Then, reprogramming is necessary using the
MIDLAND 70-1000 ElPROM Programmer. Operation parameter information is
entered into the Programmer through its keypad, converted into binary
data useful to the transceiver, then written into the E/PROM.
The following are programmable operation parameters in the SYN-TECH
mobile transceivers. See the 70-1000 E/PROM Programmer Operator's
Manual (No. 70-999113) for details.
1. All eighty transmit and eighty receive channel frequencies
2. All standard CTCSS tones for each TX and RX channel (requires
installation of the CTCSS module within the transceiver)
3. Time-out-timer time (maximum continuous transmission
duration)
4. Scan parameters as follows:
a. Two scan groups, each containing up to sixty-four
channels
b.
A variety of priority/scan channel revert arrangements
utilizing the two channel lists.
c. Either presence or absence of carrier or correct CTCSS
tone to indicate a busy channel
d. Channel sampling rate (time spent looking for carrier
presence on each channel)
e. CTCSS decode time (time allotted for decoding after
carrier is detected)
f. Scan hold time (delay of scan resume after channel
clears)
g. Post-transmit scan hold time (delay of scan resume
after PTT release)
h. Retention of scan list channels deleted (skipped) by
operator activation of the DOWN selector while in scan
mode. Normally, these selections are erased by release
of the SCAN and PRI push buttons and power-down. Pro-
gramming limits erasure to power-down only.
5. Busy channel lockout with or without alert tone to the
operator. Adding jumpers allows busy channel inhibit by
CTCSS tone status. See "BCLO JUMPERING".
6. Transmit-to-receive changeover delay of up to 200ms for
special options.
7. Last selected channel recall on power-up may be disabled.

H1 VERSION UPGRADE
The E/PROM programmer, model 70-1000, must contain H1 or later version
software to program all features and parameters into the 2-273 E/PROM
modules that are used in the 70-342XL and 70-442XL transceivers. The
version level of software installed in the programmer is identified
for one second in the two far right digits displayed after power-up.
If your programmer contains software that,is older (lower letter) than
the H1 version, upgrade is required. To date of this printing, the
newer L3 version software is current and available (in its own E/PROM)
in Update Kit No. 70-1411. The 70-1000 Operator's Manual also has
been rewritten. The May, 1985 printing can be ordered as MIDLAND part
number 70-999113.
CDCSS OPTION
If the Continuous Digital Coded Squelch System option is installed in
the transceiver, the ElPROM Module is different. This Module, MIDLAND
number 70-2402, is larger in size to accommodate an additional recep-
tacle for connection to the CDCSS board. When programming, the ElPROM
type selection entered into the Programmer is the same as for the
standard EIPROM.
ElPROM MODULE REMOVAL
The E/PROM module is a small (1"
x 2") plug-in printed circuit board
that contains IC951 and IC952, and is labeled 2-273. It is located on
the Transmitter Board, over the microprocessor IC901. For replacement
purposes, the ElPROM module model number is 70-2401.
Always disconnect primary power to the transceiver before removing the
E/PROM module. Loosen the four transceiver top cover screws and lift
the cover off. Pull the E/PROM module straight upward to separate it
from its two connectors (see below).
70-342XL OR 70-442XL TRANSCEIVER
E/PROM MODULE LOCATION

E/PROM PROGRAMMING 70-342~~/442~~
PROGRAMMING
The following E/PROM programming procedure covers most programming for
transceiver operation. Certain infrequently modified parameters are
excluded (parameters listed
as 4h, 6, and 7 on page nine). Complete
programming procedures can be found in the Programmer Operator's
Manual.
Heed this precaution:
Do not apply or remove AC-line power to the Programmer while an
E/PROM module
is plugged into it. It is not necessary, nor advis-
able, to plug the module onto the Programmer until all parameter
information
is keystroke entered. Connect the module only when
ready for the BLANK-WRITE-VERIFY operation (step 25).
1. Erase the E/PROM module in the 70-1100/1101 Eraser. Assure the
E/PROM window
is clean, and set exposure time for 45 minutes.
Refer to the Eraser instruction manuax for details.
2. Turn the 70-1000 Programmer on. One of these self-test messages
must appear in the FREQUENCY display for one second: "PASSOL3",
"PASSlL3", "PASSOHll', or "PASSIHll'. The
last two digits indicate
the required software revision level
H1 or L3 is installed in the
programmer. After two seconds, "TYP" should appear in the BAND
display. If an earlier version software
is installed, see H1
VERSION UPGRADE preceding.
3. Enter the heading (not necessary for transceiver operation, but
recommended for organization) by pressing [MANUAL], then [ENTER],
then the following:
a. The second part of the transceiver model number ('342A1,
for example). Then [ENTER].
b. Transceiver eight digit
serial number (ex.: '12345678').
Then [ENTER].
c. First three digits of a ten digit customer number
(ex.: '123'). Then [ENTER].
d. The last seven digits of the customer number
(ex.: '9ABCDEF1). Then [ENTER].
e. The month numerically (ex.: March = '3'). Then [/I.
f. The date ('1' through '31'). Then [/I.
g. The
last two digits of the year (ex.: '86'). Then [ENTER].
h. Press [RESET] to close heading sequence.
--E/PROM Type Selection--
4. Press [l] to select the standard 2-273 E/PROM Module. "2-273"
should appear. (If the transceiver contains either Talk-Around
option 70-2815 or 70-2816,
select the Z-273TA E/PROM Module type
by pressing [7] instead of [I]) Press [ENTER].

E/PROM PROGRAMMING 70-342~~/442~~
5. Select the VHF band and 2.5 KHz PLL reference code by pressing
[2], then [Dl. "15d" should appear in the BAND display (if the
transceiver has been modified with 70-2178 or 70-2179 High-Side
Injection
Kits, use band code [El instead of [Dl). Press
[ENTER]. The Programmer should now be ready for channel
frequency entry.
--Channel Frequency Programming--
The CHANNEL display indicates the numeric channel designator that
will
appear in the transceiver display. The STEP display indicates what
entry
is to be made for that channel--
"1" = receive frequency
"2"
= receive CTCSS tone frequency or receive CDCSS code
"3" = transmit frequency
"4"
= transmit CTCSS tone frequency or transmit CDCSS code
If an invalid frequency
is entered in the following steps, the fre-
quency display
will flash. Press [CLEAR], then reenter the correct
frequency.
6. CHANNEL "1" and STEP "1" should now be displayed. Key in the
desired receive frequency for channel
1 including the decimal
point. Then press [ENTER].
7. CHANNEL
"l", STEP "2", should be displayed. If a coded squelch
option
is installed in the transceiver, the CTCSS tone frequency
or CDCSS code can be entered as described below.
CTCSS Key in the desired CTCSS tone frequency to be decoded
including the decimal point (only standard EIA frequencies
are valid). The digits will appear in the FREQUENCY display.
Press [ENTER]. If
carrier squelch operation is desired or no
coded squelch option
is not installed, enter zero.
CDCSS Key in the desired three-digit standard decode code
(only EIA standard codes
are valid). The digits will appear
in the FREQUENCY display. If signal
is inverted, key [A]
after digits.
A "-" will appear. Press [ENTER]. If
carrier squelch operation
is desired or no coded squelch
option
is installed, enter zero.
The Programmer contains
a table of EIA standard CTCSS tone
frequencies and CDCSS codes, any of which each
are accessible in
this mode. Press
[Dl to call the CTCSS tone frequencies and
again to increment through them one
at a time. The CDCSS codes
are stacked on top of the CTCSS tone list, and should appear when
scrolling past the highest CTCSS tone. Press [C] to decrement
through the
lists. When the desired frequency or code is
displayed, press [ENTER] to program.

E/PROM PROGRAMMING 70-342~~/442~~
8. CHANNEL "l", STEP "3", should be displayed. Key in the desired
transmit frequency for channel
1 including the decimal point.
Then press [ENTER]. If the transmitter
is to be disabled in
channel
1, enter zero.
9. CHANNEL
"l", STEP "4", should be displayed. If the transceiver
is equipped with a coded squelch option, key in the desired CTCSS
tone frequency or CDCSS code to be transmitted, or nothing for no
tone/code transmission. Then press [ENTER]. The tone/code table
can be used in this mode also.
10. Repeat steps 6 through
10 to program the remaining seventy-nine
channels. Channels may be skipped and left unprogrammed.
Channels can be scrolled and re-accessed using the up and down
arrows.
--Center Frequency Programming--
To afford wideband capability, the self-tuned 70-342XL and 70-442XL
transceivers switch the operating range of their VCO's when selected
channel frequency crosses
a range-center frequency. This switching is
controlled by the microprocessor and must programmed into the E!PROM.
Center Frequency values entered into the E/PROM depend on the trans-
ceiver frequency band (A-band or B-band).
11. Scroll backward through the channel list with the appropriate
arrow push button. Whenever the
list is looped backwards from
channel
0 to channel 79, the Center Frequency 'channel' is
accessed and "CF" appears in the CHANNEL display. Stop on the CF
channel.
12. STEP
"1" will also appear, showing readiness for receive Center
Frequency entry. Key in '148.12' if the transceiver
is an A-band
model (136-162 MHz range) or key in '160.92' if the transceiver
is a B-band model (148-174 MHz range). Press [ENTER].
13. STEP "3" will appear, showing readiness for transmit Center
Frequency entry (STEP 2 and 4 do not apply, therefore do not
appear with the CF channel). Key in '147.20' if the transceiver
is an A-band model (136-161 MHz range) or '160.00' if the
transceiver
is a B-band model (148-174 MHz range). Press
[ENTER].
--Scan Channel Entry--
14. Channel and tone frequency entry
is complete. Press [SCAN] to
begin scan channel programming sequence. The display
will be
bgank except for the SCAN indicator.
There are two
lists of scan channels available--A and B. Each
list can be up t.o 64 channels long. The two lists are used by
the transceiver during scan operation differently, depending on
selection of the PRI and SCAN push buttons and Function Mode
programming. Details of operation are found in both the
transceiver and the Programmer operator's manuals.

E/PROM PROGRAMMING 70-342~~/442~~
15. Press [A] to program the A list. "A" will appear in the STEP
display and the first
list sequence designator "0" will appear in
the BAND display.
16. Key in the channel number to be scanned first in the
A list, then
press [ENTER]. While
it is keyed, the channel number will appear
in the CHANNEL display.
17. After [ENTER] is pressed, the A list sequence designator (BAND
display)
will increment to 1. Key in the second A scan channel
and press enter. If you make an error, press [CLEAR] and
re-
enter. If the channel entered was left blank in the channel
frequency entry steps above, the CHANNEL display
will flash to
indicate the error. Press [CLEAR] and enter
a valid channel.
18. Continue entry of the A scan list. A channel can be entered in
several scan sequence spots to cause
it to be sampled more often.
To scroll through the A list, press the up and down arrows to see
each sequence designator assignment. The highest designator is
63.
19. When the
A list entry is complete, press [B]. "b" should appear
in the STEP display and the lowest B
list scan sequence
designator (0) should appear in the BAND display. Enter B scan
list channels in the same manner as A list entry. Again, the
highest
list sequence designator is 63.
2C. Press [RESET] to exit the scan programming mode. The Channel
frequency entry mode
will resume displaying CHANNEL "OM, STEP
"l", and the appropriate frequency.
The Busy Channel Lockout feature, Time-Out-Timer feature, and scan
feature parameters
are programmed in the Function Mode. Only four of
these eight parameters need programming for most applications, there-
fore attention
is given to only these four hereinafter. Procedures to
program the others (timing adjustments, etc.) can be found in the
Programmer Operator's Manual.
21. BCLO Press [FUNC.] then [ENTER]. "FnC"
will appear in the BAND
display and
"1" in the STEP display. Function Code 1, for
programming the Busy Channel Lockout (BCLO) feature,
is now
active. Key in one of the following values, then press [ENTER].
If no entry
is made, the transceiver will operate per the default
value of
3 --no BCLO. Also see "BCLO JUMPERING'' in this section
for jumper considerations.

E/PROM PROGRAMMING 70-342~~/442~~
21. continued...
BCLO parameters:
O= BCLO without alert. No audible indicating tone will be
heard.
2= BCLO with alert. When the PTT button is pressed while ths
transceiver is inhibited, a tone will be applied to the
speaker.
3= BCLO disabled. No transmit inhibiting per receive status.
Throughout Function Mode programming, the up and down arrows will
sequentially select the Function Codes.
22. Time-Out-Timer "FnC" and "2" will be displayed. Key in the
parameter value to set the Time-Out-Timer duration as listed
below, then press [ENTER]. When the transmitter is continuously
keyed for the programmed duration, the timer disables the
transmitter and applies an audible alert tone to the speaker.
The timer is reset upon PTT release. If no entry is made, the
default value of
0 will be automatic, leaving the Time-Out-Timer
inoperative.
O= Disable the Time-Out-Timer
4= 120 seconds
1= 30 seconds
5= 150 seconds
2= 60 seconds 6= 180 seconds
3=
90 seconds 7= 210 seconds
23. Press the up arrow four times to skip to Function Code 7.
Function Codes 3 through
6 will automatically be programmed with
their default values.
If a special application requires altering
scan timing, refer to the Programmer Operator's Manual for
procedure.
24. Priority Monitoring '!FnC1' and "7" should be displayed.
Entering a value in this mode either disables priority channel
(see
erato tor's manual) sampling or changes its rate. If this
function is not programmed, the default is one Priority channel
sampling every eight channels scanned, and one Priority sampling
every second when scan is stopped on an active non-priority
channel.
Key in a value listed below, then [ENTER], to program the desired
sampling rates.
O= Sample the Priority channel once every four non-priority
channels scanned, and sample it every second when scan is
stopped.
1= Sample the Priority channel once every eight non-priority
channels scanned, and sample it every second when scan is
stopped.
2= Sample the Priority channel once every four non-priority
channels scanned, and sample it every two seconds when
scan is stopped.
3= Sample the Priority channel once every eight non-priority
channels scanned, and sample it every two seconds when
scan is stopped.
4= Disable Priority monitoring

25. Scan Format "FnC1' and "8" should be displayed. The scan
feature operates in three different mode formats--'Normal1,
'Modified', and 'Secondary'. Each
is described in the Operator's
Manual.
While operating, scan
is stopped by detection of received signal.
Programming can
set scan-stop by noise squelch carrier detection,
CTCSS detection, absence of detected
carrier, or absence of
correct CTCSS tone with
carrier presence. The latter two are
used in in special applications.
The parameter value determines both scan format and scan stop
aspects
as listed below. Key in the desired value and press
[ENTER]. The default value if no entry
is made is 1, which is
correct whether a coded squelch feature is installed in the
transceiver or not. If no CTCSS frequency nor CDCSS code
is
programmed to a channel (steps 6-11), any odd value parameter
programmed
will be decreased by one when read by the transceiver
(ex.: If
1 is programmed and CTCSS is disabled, the transceiver
will subtract 1 and operate per parameter 0.).
Function Code
8 --
O= 'NORMAL' Scan Mode with scan stopped by carrier presence
* 1= 'NORMAL' Scan Mode with scan stopped by presence of
correct CTCSS tone or CDCSS code
2= 'NORMAL' Scan Mode with scan stopped by absence of carrier
* 3= 'NORMAL' Scan Mode with scan stopped by presence of carrier
without correct CTCSS tone or CDCSS code
4= 'MODIFIED' Scan Mode with scan stopped by carrier presence
* 5= 'MODIFIED' Scan Mode with scan stopped by presence of
correct CTCSS tone or CDCSS code
6= 'MODIFIED' Scan Mode with scan stopped by absence of
carrier
*.7= 'MODIFIED' Scan Mode with scan stopped by presence of
carrier without correct CTCSS tone or CDCSS code
8= 'SECONDARY' Scan Mode with scan stopped by carrier presence
$5 9= 'SECONDARY' Scan Mode with scan stopped by presence of
correct CTCSS tone or CDCSS code
A= 'SECONDARY' Scan Mode with scan stopped by absence of
ca'rrier
* b= 'SECONDARY' Scan Mode with scan stopped by presence of ,.
carrier without correct CTCSS tone or CDCSS code
* : If the selected channel does not have a CTCSS tone or CDCSS
code programmed to
it, the transceiver microprocessor will
decrease this parameter value by one and operate accordingly.
26. This concludes the Function Mode programming sequence. Press
[RESET] to exit.
Parameter entry
is complete. If the last selected channel recall
feature
is to be disabled, or the operator-deleted scan channel recall
feature
is to be disabled, or scan timing needs modification; refer to
the Programmer Operator's Manual for programming procedures.

E/PROM PROGRAMMING 70-342~~/442~~
27. Plug the erased 2-273 ElPROM module onto the 70-1000 Programmer
as shown in Figure
2.
2-273 EIPROM MODULE
MODE
EIPROM PROGRAMMER
PROGRAMING THE E/PROM MODULE
28. Press [FUNC.] key, then the [4/B.W.V.] key. The BLANK, WRITE,
and VERIFY indicators
will each illuminate in succession as the
module
is programmed. "PASS" will be displayed if the new con-
tent in the E/PROM
is correct. If the readout displays flashing
numbers or "ERR", the E/PROM must be erased again, and validity
of the previously entered channel information
is in question.
29. Install the E/PROM Module into the transceiver.
BCLO JUMPERING
The Busy Channel Lock-out feature, if programmed as previously de-
scribed, prevents transmission on
a busy channel and can provide an
audible
alert when an attempt is made. The standard transceiver is
configured for BCLO by carrier detection when enabled by programming.
Therefore if neither CTCSS nor CDCSS are used, no jumpers change
is
necessary. If desired, and if CTCSS (or CDCSS) is installed in the
transceiver,
a jumper can be moved to an alternate location inside the
transceiver to prevent transmission only when an appropriate CTCSS
tone
is received.
The BCLO jumper positions, JP107 and JP108, are located on the Trans-
mitter Board between the modulator (L101, L102) shield and front PC
board edge. Remove the jumper
wire from JP107 position and install
it into the JP108 position to set BCLO by CTCSS tone (or CDCSS code)
detection. Do not install jumpers in both positions.

TRANSCEIVER CALIBRATION 70-342~~/442~~
SUGGESTED TEST EQUIPMENT FOR TRANSMITTER CALIBRATION
Test Instrument Instrument Capabilities Instrument Type
DC Power Supply 13.8 VDC, 10 amps Power Mate BPA-20PF
Wattmeter 50 watts, 136-174 MHz Bird model 43 with 50C
element and 50 ohm load
Deviation Meter 136-174 MHz.
+/-5KHz range p/o Cushman CE-31A
Frequency Meter or 136-174 MHz p/o Cushman CE-31A or.
Frequency Counter 2.0 ppm accuracy Heath SM-4120
Audio Generator 0-10 KHz sine-wave, Heath SG-5218
0-5 Vrms output
CALIBRATION SET-UP
POWER SUPPLY