Frequency Range 450 - 470 MHz
Number of Channels 6CH (Pre-set 99CH bank)
Channel Spacing Analog 12.5/25* kHz
Digital - NXDN 6.25/12.5 kHz
Power Supply 3.8 V DC ± 10 %
Battery Life 5-5-90
KNB-81L Save On Approx. 15.5 hours 
KNB-81L Save Off Approx. 14 hours 
Operating Temperature -14 °F to +140 °F (-10 °C to +60 °C)
Frequency Stability ±2.5 ppm
Dimensions (W x H x D) Projections Not Included 1.97 x 3.70 x 1.07 in (50 x 94 x 27 mm)
Weight Radio Full Keypad Model 5.64 oz (160 g)
Sensitivity NXDN® 6.25 kHz Digital (3% BER) 0.25 μV
NXDN®12.5 kHz Digital (3% BER) 0.25 μV
Analog 12.5 kHz (12dB SINAD) 0.28 μV
Analog 25 kHz 0.25 μV
Selectivity AnalogA 12.5 kHz 50 dB
AnalogA 25 kHz 60 dB
Intermodulation 50 dB
Spurious Rejection 55 dB
Audio Distortion Less than 10%
Audio Output Power 750 mW (Internal) / 100mW (External)
RF Power Output (High / Mid / Low) 2W / 1W
Spurious Response 50 dB
FM Hum & Noise AnalogA 12.5 kHz 40 dB
AnalogA 25kHz 45 dB
Emission Designator 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D,
8K30F1E, 8K30F1D, 8K30F7W (Digital)
16K0F3E, 11K0F3E (Analog)
Audio Distortion Less than 5 %

* 25 kHz are not included in the models sold in the USA or US territories.
Analog measurements made per TIA603. Specifications are measured according to applicable standards.
Specifications shown are typical and subject to change without notice, due to advancements in technology.


MIL Standard MIL 810C Methods/
MIL 810D Methods/
MIL 810E Methods/
MIL 810F  Methods/
MIL 810G  Methods/
Low Pressure 500.1/Procedure I 500.2/Procedure I, II 500.3/Procedure I, II 500.4/Procedure I, II 500.5/Procedure I, II
High Temperature 501.1/Procedure I, II 501.2/Procedure I, II 501.3/Procedure I, II 501.4/Procedure I, II 501.5/Procedure I, II
Low Temperature 502.1/Procedure I 502.2/Procedure I, II 502.3/Procedure I, II 502.4/Procedure I, II 502.5/Procedure I, II
Temperature Shock 503.1/Procedure I 503.2/Procedure I 503.3/Procedure I 503.4/Procedure I, II 503.5/Procedure I
Solar Radiation 505.1/Procedure I 505.2/Procedure I 505.3/Procedure I 505.4/Procedure I 505.5/Procedure I
Rain 506.1/Procedure I, II 506.2/Procedure I, II 506.3/Procedure I, II 506.4/Procedure II, III 506.5/Procedure II, III
Humidity 507.1/Procedure I, II 507.2/Procedure II, III 507.3/Procedure II, III 507.4 507.5/Procedure II
Salt Fog 509.1/Procedure I 509.2/Procedure I 509.3/Procedure I 509.4 509.5
Dust 510.1/Procedure I 510.2/Procedure I 510.3/Procedure I 510.4/Procedure II, RED 510.5/Procedure I
Vibration 514.2/Procedure VIII, X 514.3/Procedure I 514.4/Procedure I 514.5/Procedure I 514.6/Procedure I
Shock 516.2/Procedure I, II, V 516.3/Procedure I, IV 516.4/Procedure I, IV 516.5/Procedure I, IV 516.6/Procedure I, IV

International Protection Standard

Dust & Water Protection IP54/55/67