NHRC MASTR II InfoSite -- MASTR II Combination Numbers

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Combination Numbers

From the outside of the cabinet, the MASTR II mobile radios all look the same. The "combination number" is the key to decode what band the radio was built for, and what options were shipped inside or with the radio. Use these combination number 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 red.

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

Low Band Combination Numbers

1_st digit	2_nd digit	3_rd digit	4_th digit	5_th digit	6_th digit	7_th digit	8_th and 9_th digits	10_th digit
Mechanical Package	System Voltage	Power Output	Channel Spacing	Frequency Capability	Number of Freq.	Options	Frequency Range	Oscillator Stability
E E-Chassis (thick)	C ± 12VDC	4 8-20 Watts	4 20 KHz	A 1-Freq.	A 1-Freq. Xmit. 1-Freq. Rec.	S Standard	12 25-30 MHz.	A ± 5 PPM (± .0005%)
M Standard	J DC Ground Converter	5 21-40 Watts	5 25 KHz	C 2-Freq.	A 2-Freq. Xmit. 1-Freq. Rec.	U Channel Guard	13 30-36 MHz.	B ± 2 PPM (± .0002%)
	X ± 12VDC Less Accessories	6 41-80 Watts	6 30 KHz	K 8-Freq.	C 2-Freq. Xmit. 2-Freq. Rec.	N Noise Blanker	23 36-42 MHz.	C ± 5 PPM (± .0005%) PLL
	Y ± 24VDC Less Accessories	7 81-120 Watts			D 1-Freq. Xmit. 2-Freq. Rec.	W Channel Guard & Noise Blanker	33 42-50 MHz.	D ± 2 PPM (± .0002%) PLL
					E 3-Freq. Xmit. 3-Freq. Rec.	P UHS Receiver
					F 4-Freq. Xmit. 4-Freq. Rec.	G UHS Receiver & Channel Guard
					G 5-Freq. Xmit. 5-Freq. Rec.
					H 6-Freq. Xmit. 6-Freq. Rec.
					J 7-Freq. Xmit. 7-Freq. Rec.
					K 8-Freq. Xmit. 8-Freq. Rec.

VHF Combination Numbers

1_st digit	2_nd digit	3_rd digit	4_th digit	5_th digit	6_th digit	7_th digit	8_th and 9_th digits	10_th digit
Mechanical Package	System Voltage	Power Output	Channel Spacing	Frequency Capability	Number of Freq.	Options	Frequency Range	Oscillator Stability
E E-Chassis (thick)	C ± 12VDC	5 40 Watts	6 30 KHz	A 1-Freq.	A 1-Freq. Xmit. 1-Freq. Rec.	S Standard	56 138-150.8	A ± 5 PPM (± .0005%)
M Standard	X ± 12VDC Less Accessories	6 75 Watts		C 2-Freq.	A 2-Freq. Xmit. 1-Freq. Rec.	U Channel Guard	66 150.8-174 MHz	B ± 2 PPM (± .0002%)
		7 110 Watts		K 8-Freq.	C 2-Freq. Xmit. 2-Freq. Rec.	N Noise Blanker		C ± 5 PPM (± .0005%) PLL
					D 1-Freq. Xmit. 2-Freq. Rec.	W Channel Guard & Noise Blanker		D ± 2 PPM (± .0002%) PLL
					E 3-Freq. Xmit. 3-Freq. Rec.	P UHS Receiver
					F 4-Freq. Xmit. 4-Freq. Rec.	Q UHS Receiver & Channel Guard
					G 5-Freq. Xmit. 5-Freq. Rec.
					H 6-Freq. Xmit. 6-Freq. Rec.
					J 7-Freq. Xmit. 7-Freq. Rec.
					K 8-Freq. Xmit. 8-Freq. Rec.

UHF Combination Numbers

1_st digit	2_nd digit	3_rd digit	4_th digit	5_th digit	6_th digit	7_th digit	8_th and 9_th digits	10_th digit
Mechanical Package	System Voltage	Power Output	Channel Spacing	Frequency Capability	Number of Freq.	Options	Frequency Range	Oscillator Stability
E E-Chassis (thick)	C ± 12VDC	4 20 Watts	5 25 KHz	A 1-Freq.	A 1-Freq. Xmit. 1-Freq. Rec.	S Standard	77 406-420 MHz	A ± 5 PPM (± .0005%)
M Standard	X ± 12VDC Less Accessories	5 40 Watts		C 2-Freq.	A 2-Freq. Xmit. 1-Freq. Rec.	U Channel Guard	78 420-450 MHz	B ± 2 PPM (± .0002%)
		6 75 Watts		K 8-Freq.	C 2-Freq. Xmit. 2-Freq. Rec.	P UHS Receiver	88 450-470 MHz
		7 100 Watts			D 1-Freq. Xmit. 2-Freq. Rec.	G UHS Receiver & Channel Guard	89 470-494 MHz
					E 3-Freq. Xmit. 3-Freq. Rec.		91 494-512 MHz
					F 4-Freq. Xmit. 4-Freq. Rec.
					G 5-Freq. Xmit. 5-Freq. Rec.
					H 6-Freq. Xmit. 6-Freq. Rec.
					J 7-Freq. Xmit. 7-Freq. Rec.
					K 8-Freq. Xmit. 8-Freq. Rec.