August, 1996 6880904Z07-O
 
xiii
 
GP350 Portable Radios Service Manual Foreword 
Radio Model Information
Test Set Service Cable
Radio Model Information
 
The model number, serial number, and Motorola FCC designation number are all on a label attached to the back of your radio. From 
this model number, you can determine the RF output power, frequency band, type of squelch, and number of channels. The table 
below outlines one portable radio model number and its specific characteristics.
All GP350 radio models are synthesized, two or sixteen channel units that come standard with tone Private-Line (TPL) or Dig-
ital Private-Line (DPL) coded squelch, which may be enabled / disabled on a per channel basis. Programming changes can be 
made by your local Motorola Radius dealer.
 
Radio Model Number (Example: P94MGC20C2AA)
Type
of
Unit Tx Power Freq.
Model
Series
Channel
Spacing
Channel
Capability
Frequency
Sub-band Version
Unique
Model
Variation
 
P
 
9
 
1-5 W VHF
1-4 W UHF
 
3
 
VHF
 
MGC
 
Universal
 
00
 
12.5 kHz
 
A
 
2 Channels
 
1
 
Low Split
 
A
4
 
UHF
 
20
 
20/25 kHz
 
2, 3 or 4
 
High Split
 
A
P 
 
= Portable
 
C
 
16 Channels
 
A
 
 = Package Model with 
Battery, Antenna, Belt Clip, 
Charger.
5
6
7
8
9
1
14
4
3
2
12
11
     (P1) DETAIL
    FRONT SIDE
NOTE: Pins 2 and 7 
  are cut.
NOTE: For proper speaker impedance, the RTX4005B
test set Audio out switch must be set to the “MX” position
Figure 1. Service Cable (RKN4034A) for the Test Set (RTX4005B)
VIEWED FROM POGO PIN
SIDE OF ADAPTER
Speaker
Common
Ground
External
Select
External
Speaker
External
Microphone
MAEPF-25490-O
6
12
14
11
2
3
4
5
1
7
8
9
P1
3.5 mm plug
2.5 mm plug
33k, 1/8 w
1.0 uF
47 ohm, 1/2w
+
sleeve
tip
sleeve 
tip
Speaker (Hi)
Speaker (Lo)
Gnd
Mic. Audio
PTT