Midland 70-1341 User manual

SERVICE MANUAL
70-1341/70-1344/70-1441/70-1444
FM TWO-WAY
LAND MOBILE RADIO
TITAN VHF HIGH BAND
(150 — 174 MHz)
12.5/30 WATT
70-134100
4/99

This manual is designed to facilitate the set-up and service of the Midland Titan VHF mobile
transceiver. As necessary, service manual supplements will be published and distributed on the
following forms:
Manual Addition (MA) ................For supplemental information useful in product service
or improvement. Printed on BLUE paper.
Change Notice (CN)...................For details about changed 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. Printed on PINK paper.
Comments or suggestions concerning areas of manual improvement are welcome.
ii

TABLE OF CONTENTS
Manual Supplement Information...........................................................................ii
Table of Contents...................................................................................................iii
Acronyms and Abbreviations................................................................................vi
SECTION 1 GENERAL INFORMATION
Description................................................................................................................1 - 3
Specifications ...........................................................................................................1 - 3
Accessories ..............................................................................................................1 - 6
SECTION 2 PREPARATION
Complete Realignment.............................................................................................2 - 3
SECTION 3 INSTALLATION
Installation.................................................................................................................3 - 3
SECTION 4 SERVICING
Component Replacement.........................................................................................4 - 3
Troubleshooting Charts............................................................................................4 - 7
SECTION 5 CIRCUIT DESCRIPTION
Description................................................................................................................5 - 3
SECTION 6 DIAGRAMS
Block Diagram..........................................................................................................6 - 3
Wiring Diagram.........................................................................................................6 - 4
TR-1529 Layout — Bottom View..............................................................................6 - 5
TR-1529 Layout — Top View...................................................................................6 - 6
RF Schematic Diagram ............................................................................................6 - 7
Logic Schematic Diagram ........................................................................................6 - 8
Z-1022 Schematic Diagram......................................................................................6 - 9
Z-1023 Schematic Diagram......................................................................................6 - 9
Z-1022 Layouts.........................................................................................................6 - 10
Z-1022 Layouts.........................................................................................................6 - 10
CX-217 (Standard Control Head) Layouts...............................................................6 - 10
CX-217 (Standard Control Head) Schematic...........................................................6 - 11
CX-224 (Deluxe Control Head) Layouts...................................................................6 - 12
CX-224 (Deluxe Control Head) Schematic ..............................................................6 - 13
Exploded View (With Standard Control Head).........................................................6 - 14
Exploded View (With Deluxe Control Head) ............................................................6 - 15
Trunk-Mount Exploded View....................................................................................6 - 16
SECTION 7 PARTS
Parts List...................................................................................................................7 - 3
Replacement Parts Ordering....................................................................................7 - 10
iii

iv

SECTION 1 — GENERAL INFORMATION
SECTION 2 — PREPARATION
SECTION 3 — INSTALLATION
SECTION 4 — SERVICING
SECTION 5 — CIRCUIT DESCRIPTIONS
SECTION 6 — DIAGRAMS
SECTION 7 — PARTS
v

vi
ACRONYMS AND ABBREVIATIONS
Below is a list of common electrical acronyms and abbreviations used in Midland documentation.
ANI................................ Automatic Number Identification
CTCSS.......................... Continuous Tone-Controlled Squelch System
DCS (or CDCSS).......... Continuous Digital- Controlled Squelch System
DTMF............................ Dual Tone Multi-Frequency
EEPROM...................... Electrically Erasable Programmable Read Only Memory
MIL................................ Military Specification
RX................................. Receive
SINAD........................... The ratio in decibels of signal + noise + distortion to noise + distortion
TX ................................. Transmit
VCO.............................. Voltage Controlled Oscillator

SECTION 1
GENERAL INFORMATION

GENERAL INFORMATION
70-1341/1344/1441/1444
NOTES
1 - 2

GENERAL INFORMATION
70-1341/1344/1441/1444
DESCRIPTION
The 70-1341/1344/1441/1444 Midland Titan Series transceivers are programmable, frequency-synthesized, two-
way FM mobile radios that operate in high-band VHF frequency (150 — 174 MHz). They are programmable for
up to 120 channels (320 with optional kit). Transmit RF power is adjustable for 25 — 50 W.
MODEL NUMBERS
70-1341: VHF Titan Mobile, Under-Dash Mount, Standard Control Head (with Internal Speaker)
70-1344: VHF Titan Mobile, Under-Dash Mount, Deluxe Control Head (with 70-2357 External Speaker)
70-1441: VHF Titan Mobile, Trunk Mount, Standard Control Head (with Internal Speaker)
70-1444: VHF Titan Mobile, Trunk Mount, Deluxe Control Head (with 70-2357 External Speaker)
SPECIFICATIONS
Refer to TIA/EIA-603 standards for measurement methods.
GENERAL
FREQUENCY RANGE: 150 — 174 MHz
CHANNEL SEPARATION: 24 MHz
CHANNEL SPACING: 12.5/30 kHz (selectable by channel)
CHANNEL STEPPING: 2.5 kHz/6.25 kHz
CHANNEL CAPACITY: Programmable for up to 120 channels, 320 optional
POWER SUPPLY: 13.6 V DC negative to ground
OPERATING VOLTAGE RANGE: 12.2 V — 15.0 V
CURRENTY DRAIN:
Transmit (at 50 W): 10.0 A
Receive (@rated audio): 2.5 A
Standby (std, varies with options): 400 mA
OPERATING TEMPERATURE RANGE: -30° C — +60° C
RELATIVE HUMIDITY: 90% @ 50° C ±2° C
DIMENSIONS (H x W x D): 69 mm x 184 mm x 222 mm (2.75 x 7.75 x 8.75 in)
WEIGHT: 2.7 kg (6 lb)
1 - 3

GENERAL INFORMATION
70-1341/1344/1441/1444
RECEIVER
FREQUENCY STABILITY: 0.00025 % (-30° C — +60° C)
SENSITIVITY (12 dB SINAD): 0.25 V
SELECTIVITY:
±25 kHz: -80 dB
±30 kHz: -80 dB
FREQUENCY SEPARATION: 24 MHz min (@ full-rated specifications)
ACCEPTABLE RADIO FREQUENCY DISPLACEMENT: 40% of rated system deviation
SPURIOUS REJECTION: -80 dB
INTERMODULATION:
±25/30 kHz: -80 dB
±12.5/15 kHz: -75 dB
SQUELCH SENSITIVITY: 0.18 V maximum
AUDIO POWER OUTPUT:
Internal Speaker: 3 W @ less than 3% Distortion
External Speaker: 10 W @ less than 3% Distortion
TRANSMITTER
RF OUTPUT: 50 W
FREQUENCY STABILITY: 0.00025 % (-30° C — +60° C)
MODULATION (direct FM):
5 kHz max: 16K0F3E
2.5 kHz max: 11K0F3E
FREQUENCY SEPARATION: 24 MHz @ full rated specifications
SPURIOUS AND HARMONICS: -80 dB
FM HUM AND NOISE: -50 dB
AUDIO RESPONSE: Per TIA/EIA-603 specifications
AUDIO DISTORTION (3 kHz deviation): 2% @ 1 kHz (@ 60% deviation)
OUTPUT IMPEDANCE: 50 
— Specifications subject to change without notice —
1 - 4