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Vertex Standard
Two-Way Radio

 VX-424A LTR VX-427A LTR
  LTR Trunking or Conventional Mode
32 Systems / 250 Groups
  5 Watt
Compact Portable


Vextex Standard Logo

Vertex Standard VX-420A LTR Series Trunking or Conventional Mode UHF or VHF Portable 2-Way Radio

General Specifications

VX-420A LTR Series

VX-420A LTR Series

Number of Systems


Number of Groups


Number of Channels

Conventional: 250
Trunking: 640

Frequency Range

146-174 MHz 450-490  MHz

Channel Spacing

12.5/20/25 KHz 12.5/20/25 KHz

Power Supply Voltage

7.5 VDC 20%
Battery Life (5-5-90 duty)

10hrs / 13hrs w/saver

 7hrs / 8.8hrs w/saver

9.5hrs / 12hrs w/saver

 6.5hrs / 8hrs w/saver

Ambient Temperature Range

-22 F to +140 F (-30 C to +60 C)

Frequency Stability

2.5 ppm

RF Input-Output Impedance

50 Ohms

Audio Output

500 MW @ 4 Ohms THD

Dimensions (H x W x D)

4.3 x 2.3 x 1.2 (108.5 x 58 x 30 mm) FNB-V57

Weight (Approx.)

10.6 oz (300g) (w/FNB-V67LI, Antenna, Belt Clip)

Receiver Specifications

Measurements made per EIA standard TIA/EIA-603

Circuit Type

Double Conversion Super-heterodyne

   EIA 12 dB SINAD 
0.25 V Typical
Adjacent Channel Selectivity   

>70/>65 dB (W/N)


>70 dB (W/N)

Spurious Response Rejection

>70 dB

Image Rejection

>70 dB

Hum and Noise

>45 dB

Audio Output

500 mW @ 4 ohms 5% THD

Transmitter Specifications

Measurement made per EIA standard TIA/EIA-603

Power Output

5 / 1  Watt (Selectable)

Frequency Stability

2.5 ppm


Direct FM (16K0F3E/11K0F3E)

Max Deviation

5.0 kHz (25 kHz) /  2.5 kHz (12.5 kHz)

Conducted Spurious Emissions

70 dB Below Carrier

FM Hum and Noise

>45 dB

Audio Distortion

Less than 3% @ 1kHz

Microphone Type

2-K Ohm Condenser

Specifications subject to change without notice or obligation.


Standard MIL 810D Methods/Procedures MIL 810E Methods/Procedures MIL 810F Methods/Procedures
Low Pressure
High Temperature
Low Temperature
Temperature Shock
Salt Fog
500.2/Procedure 1, 2
501.2/Procedure 1, 2
502.2/Procedure 1, 2
503.2/Procedure 1
506.2/Procedure 2
507.2/Procedure 2, 3
510.2/Procedure 1
514.3/Procedure Cat. 10
516.3/Procedure 1
500.3/Procedure 1, 2
501.3/Procedure 1, 2
502.3/Procedure 1, 2
503.3/Procedure 1
506.3/Procedure 2
507.3/Procedure 2, 3
510.3/Procedure 1
514.4/Procedure Cat. 10
516.4/Procedure 1
500.4/Procedure 1, 2
501.4/Procedure 1, 2
502.4/Procedure 1, 2
503.4/Procedure 1, 2
506.4/Procedure 1, 3
510.4/Procedure 3
514.5/Cat. 24
516.5/Procedure 1
Specifications are subject to change without notice or obligation. VERTEX STANDARD is registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. Vertex Standard Co. Ltd. 2009 NSS230_11/2009_S


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Copyright 2000-2018  Multec Communications / - All rights reserved. Do not duplicate without the express written consent of Multec Communications.
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Multec Communications
319 Centre Ave.  #166
Rockland, MA  U.S.A.   02370-2613
781 294-4992 main
781 527-5004 fax (include return email w/fax)

Main 781 294-4992
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         All pricing and specifications subject to change without notice.