GENERAL SPECIFICATION

Low Band (GM338 only)

VHF

UHF

*Frequency Range

29.7-36MHz

136-174MHz

403-470MHz

36-42MHz

450-527MHz (1-25W)

42-50MHz

450-520MHz (25-40W)

Frequency Stability (-30 C to 60 C,25c Ref,)

5ppm

± 2.5pm

± 2ppm

Channel Capacity

GM338: 128 Channels

GM398: 160 Channels

Power Output

40 - 60 W

1 - 25W

1 - 25W

25 - 45W (GM338 only)

25 - 40W (GM338 only)

Power Supply

13.2Vdc (10.8 - 15.6 Vdc) Negative Vehicle ground

Channel Spacing

12.5/20/30kHz

12.5/20/25 kHz

Dimensions (L x W x H)

GM338: (add 9mm for volume knob)

255mm x 185mm x 72mm

186mm x 179mm x 59mm

GM398: (add 7mm for volume knob)

188mm x 185mm x 72mm

Weight

2040gms (4.5lbs)

1400gms (3.15 lbs)

Operating Temperature

-30°C to +60°C

Sealing

Passes rain testing to IP54

Shock and Vibration

Meets MIL-STD 810-c,D&E and TIA/EIA 603

Dust

Meets MIL-STD 810-C,D&E and TIA/EIA 603

Humidity

Meets MIL-STD 810-C,D&E and TIA/EIA 603

Transmitter

Low Band (GM338 only)

VHF

UHF

Modulation Limiting

± 12.5 @ 12.5kHz

± 2.5kHz @12.5kHz

± 5.0 @ 20/30kHz

± 4.0kHz @20kHz

± 5.0kHz @25kHz

FM Hum & Noise

- 40dB @ 12.5kHz

- 40dB @ 12.5kHz

- 45dB @ 20/30kHz

- 45dB @ 20/25kHz

Conducted/Radiated Emissions

- 26dB < 1 GHz

- 36dBm < 1 GHz

- 30dBm < 1 GHz

Adjacent Channel Power

- 60dB < 12.5kHz

- 60dBm @ 12.5kHz

- 70dB < 20/30kHz

- 70dBm @ 20/25kHz

Audio Response (300 to 3000Hz)

+ 1, - 3dB

Audio Distortion @ 1000Hz, 1000Hz,

60% Rated Max. Deviation

3%

Receiver

Low Band (GM338 only)

VHF

UHF

Sensitivity (12dBSINAD

0.25uV Typical

0.22uV

Intermodulation (EIA)

78dB Typical

78dB @ 25kHz

75dB @ 25kHz

78dB @ 20kHz

75dB @ 20kHz

75dB @ 12.5kHz

75dB @ 12.5kHz

Adjacent Channel Selectivity

65dB @ 12.5kHz

80dB @ 25kHz

75dB @ 25kHz

80dB @ 20/30kHz

70dB @ 20kHz

70dB @ 20kHz

65dB @ 12.5kHz

65dB @ 12.5kHz

Spirious Rejection

70dB @ 12.5kHz

80dB @ 20/25kHz

75dB @ 20/25kHz

80dB @ 20/30kHz

75dB @ 12.5kHz

70dB @ 12.5kHz

Rated Audio

3W Internal

7.5W & 13W External

Audio Distortion @ rated audio

3% Typical

Hum & Noise

- 40dB @ 12.5kHz

- 40dB @ 12.5kHz

- 45dB @ 20/30kHz

- 45dB @ 20/25kHz

Audio Response (300 to 3000Hz)

+ 1, 3dB

Conducted Spurious Emission

- 57dBm > 1 GHz

per FCC part 15

- 47dBm > 1 GHz

* Availability subject to country law and regulations. Radios meet applicable regulatory requirements.

All specifications shown are subject to change without notice. Specifications are not representative of all radios and may vary in different radios.

GM338 & GM398 Specifications*