GE MASTR II Nomenclature
By Kevin Custer  W3KKC


From the outside of the cabinet, the MASTR II mobile radios all look about the same. The nomenclature or "combination number" is the key to decode what band the radio was built for, and what options were originally shipped inside or with the radio. Use these tables to decipher the combination numbers and choose the right radio for your conversion. The frequency ranges that are most easily converted to amateur band operation are marked in blue.  Frequency ranges marked in red will likely tune the ham band without component changes but may not provide the book performance specifications.

The information in these tables was gleaned from several MASTR II maintenance and service manuals.
 

The first digit is either an M or E which equates to it's mechanical packaging.
M is standard.
E is thick.

The second digit is system voltage configuration.
C for 12 VDC negative ground.
X for 12 VDC positive or negative ground less accessories.

Quick jump to:
Low Band
Mid Band
High Band
UHF Silver Handle
UHF Brown Handle
 
 

25 - 50 MHz MASTR II

3rd 
Power
Output		 4th 
Channel
Spacing		 5th 
Frequency
Capability		 6th 
Number
Frequencies		 7th 
Options		 8th & 9th 
Frequency
Range		 10th
Oscillator
Stability
6
30 watts		 4
20 kHz		 A
1 Freq		 A
1 xmit
1 recv		 S
Standard		 12
25 - 30 MHz		 A
±5 ppm
7
100 watts		 C
2 Freq		 B
2 xmit
1 recv		 U
channel guard		 13
30 - 36 MHz		 B
±2 ppm
K
8 Freq		 C
2 xmit
2 recv		 N
noise blanker		 23
36 - 42 MHz
1 xmit
2 recv		 W
channel guard &
noise blanker		 33
42 - 50 MHz
E
3 xmit
3 recv
F
4 xmit
4 recv
G
5 xmit
5 recv
H
6 xmit
6 recv
J
7 xmit
7 recv
K
8 xmit
8 recv

 
 
 

66 - 88 MHz MASTR II

3rd 
Power
Output		 4th 
Channel
Spacing		 5th 
Frequency
Capability		 6th 
Number
Frequencies		 7th 
Options		 8th & 9th 
Frequency
Range		 10th
Oscillator
Stability
5
25 watts		 4
20 kHz		 A
1 Freq		 A
1 xmit
1 recv		 S
Standard		 44
66 - 78 MHz		 A
±5 ppm
C
2 Freq		 B
2 xmit
1 recv		 U
channel guard		 45
77 - 88 MHz		 B
±2 ppm
K
8 Freq		 C
2 xmit
2 recv
D
1 xmit
2 recv
E
3 xmit
3 recv
F
4 xmit
4 recv
G
5 xmit
5 recv
H
6 xmit
6 recv
J
7 xmit
7 recv
K
8 xmit
8 recv

 
 
 

138 - 174 MHz MASTR II

3rd 
Power
Output		 4th 
Channel
Spacing		 5th 
Frequency
Capability		 6th 
Number
Frequencies		 7th 
Options		 8th & 9th 
Frequency
Range		 10th
Oscillator
Stability
5
35 watts KT-32-A,C
40 watts KT-32-B,K		 6
30 kHz		 A
1 Freq		 A
1 xmit
1 recv		 S
Standard		 56
138 - 150.8 MHz		 A
±5 ppm
6
65 watts		 C
2 Freq		 B
2 xmit
1 recv		 U
channel guard		 66
150.8 - 174 MHz		 B
±2 ppm
7
110 watts		 K
8 Freq		 C
2 xmit
2 recv		 N
noise blanker		 C
±5 ppm
PLL
D
1 xmit
2 recv		 W
channel guard &
noise blanker		 D
±2 ppm
PLL
E
3 xmit
3 recv		 P
UHS receiver
F
4 xmit
4 recv		 G
UHS receiver &
channel guard
G
5 xmit
5 recv
H
6 xmit
6 recv
J
7 xmit
7 recv
K
8 xmit
8 recv

 
 
 

406 - 420 & 450 - 512 MHz MASTR II (40 Watts)
450 - 512 MHz MASTR II (20 Watts)
Transmitter ID's: KT-35-A,C - KT-36-A,C
(These are the Silver Handled tripler type PA decks)

3rd 
Power
Output		 4th 
Channel
Spacing		 5th 
Frequency
Capability		 6th 
Number
Frequencies		 7th 
Options
8th & 9th
Frequency
Range
 10th
Oscillator
Stability
5
20 watts		 5
25 kHz		 A
1 Freq		 A
1 xmit
1 recv		 S
Standard		 77
406 - 420 MHz		 A
±5 ppm
6
40 watts		 C
2 Freq		 B
2 xmit
1 recv		 U
channel guard		 88
450 - 470 MHz		 B
±2 ppm
K
8 Freq		 C
2 xmit
2 recv		 P
UHS receiver		 89
470 - 494 MHz
D
1 xmit
2 recv		 G
UHS  receiver
&
channel guard		 91
494 - 512 MHz
E
3 xmit
3 recv
F
4 xmit
4 recv
G
5 xmit
5 recv
H
6 xmit
6 recv
J
7 xmit
7 recv
K
8 xmit
8 recv

 
 
 
 

406 - 512 MHz MASTR II
Transmitter ID's: KT-35-B,D - KT-36-B,D - KT-37-A,C - KT-112-A,C
Brown Handled UHF Unit (best for building a UHF repeater)

3rd 
Power
Output		 4th 
Channel
Spacing		 5th 
Frequency
Capability		 6th 
Number
Frequencies		 7th 
Options		 8th & 9th
Frequency
Range		 10th
Oscillator
Stability
4
20 watts		 5
25 kHz		 A
1 Freq		 A
1 xmit
1 recv		 S
Standard		 77
406 - 420 MHz		 A
±5 ppm
5
40 watts		 C
2 Freq		 B
2 xmit
1 recv		 U
channel guard		 78
420 - 450 MHz		 B
±2 ppm
6
75 watts		 K
8 Freq		 C
2 xmit
2 recv		 P
UHS receiver		 88
450 - 470 MHz
7
100 watts		 D
1 xmit
2 recv		 G
UHS receiver &
channel guard		 89
470 - 494 MHz
E
3 xmit
3 recv		 91
494 - 512 MHz
F
4 xmit
4 recv
G
5 xmit
5 recv
H
6 xmit
6 recv
J
7 xmit
7 recv
K
8 xmit
8 recv

 
 
 
 
 
 

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2001 Kevin Custer W3KKC
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