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GM338 Specification*
General Specifications
Low Band(GM338only)
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 oC) +-5ppm +-2.5ppm
+-2ppm
Channel Capacity GM338:128 channels  
  GM398:160 channels  
Power Output 40-60 W  
Power Supply 13.2Vdc (10.8-15. 6vdc)Negative Vehicle ground
Channel Spacing 20KHz 12.5/20/25 KHz
Dimensions(L*W*H) GM338:(add 9mm for volume knob)
255mm*185mm*72mm186mm*179mm*59mm
GM398:(add 7mm for volume knob) 188mm*185mm*72mm
Weight2040gms(4.5lbs)1400gms(3.15lbs)
Transmitter
VHF
UHF
Modulation Limiting

+-2.5kHz@12.5kHz
+-40.kHz @20kHz
+-5.0kHz @25kHz

 

 
FM Hum & Noise -40dB @ 12.5 kHz
-45dB @ 20/25 kHz
  
Conducted/Radiated Emissions
-30dBm>1 GHz
 -36dBm<1 GHz
Adjacent Channel Power -60dB @ 12.5 kHz
-70dB @ 20/25 kHz
  
Audio Response (300 to 3000Hz)    
     
Receiver VHF UHF
Sensitivity(12db SINAD ) 0.22µV  
Intermodulation(EIA) 78dB@25kHz
78dB@20kHz
75dB@12.5kHz 		75dB@25kHz
75dB@20kHz
75dB@12.5kHz
Adjacent Channel Selectivity 80dB@25kHz
70dB@20kHz
65dB@12.5kHz 		75dB@25kHz
70dB@20kHz 65dB@12.5kHz
Spurious Rejection 80dB@20/25kHz
75dB@12.5kHz

75dB@20/25kHz
70dB@12.5kHz
Hum and Noise -40dB@12.5kHz
-45dB@20/25kHz		  
Audio Response +1,-3dB  
Operating Temperature 30oC
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

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