Smallest submersible P25 portable radio

VX-P820 Series

The Vertex Standard VX-P820 series offers P25 technology in a compact and feature rich form factor, not found in many other radios of the same size.
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P25 Digital Mode Capabilities:

Expanded Signalling

Supports selective calling, Talk Group IDs (TGID), Network Access Codes, Individual ID lists and Paging Group lists for flexible communications.

Secure Communications

Options available to support both Advanced Encryption Standard (AES) and Data Encryption Standard (DES) as required by APCO Project 25. Additionally, multiple encryption keys can be stored in the radio.

Mixed Mode

Seamlessly switch between analogue to P25 digital mode on each channel based on call type received and on programming for transmit.

Enhanced Voice Quality

Featuring the AMBE+2™ Vocoder, get exceptional voice quality in both digital P25 and narrow-band modes of operation. Suppresses background noise and improves clarity of radio transmission.

Connectivity Assurance

The RSSI indictor emits an audible alert when the receive signal strength drops to a level not suitable for reliable communications.

Additional P25 Mode Features:

  • Caller ID Display (w/LCD)
  • BCLO, TOT Functions

Intrinsically Safe

Intrinsically safe models are SGS certified to the requirements of ANSI/UL913 5th Edition for use in Class I, II, III, Division 1; Groups C, D, E, F, G; Temp T3C hazardous locations.

When Safety Counts - Never Be Alone

Includes Emergency notification that will switch to a designated channel and send an emergency alert for help.
The radios also include Remote Monitor which lets you monitor the situation happening near a target radio if someone is unresponsive. For enhanced user safety in analogue mode, Lone Worker is a built-in timer that requires the user to reset at a predetermined interval. If not reset, the radio automatically switches to Emergency mode to alert help.

Analogue Mode Only Features

  • 512 Channels / 32 Groups (VX-P824 / VX-P829)
  • 16 Channels (VX-P821)
  • 5 Watts
  • 700 mW Audio output
  • 9 programmable keys (VX-P829)
  • 7 programmable keys (VX-P824)
  • 3 Programmable keys (VX-P821)
  • IP Rating: 57 (1 metre – 30 minutes)
  • Direct channel recall (VX-P824 / VX-P829)
  • Field programmable (VX-P829)
  • Intrinsically safe (option)*
  • 12-Character alphanumeric display (VX-P824 / VX-P829)
  • Busy Channel Lockout, Busy Tone Lockout and Time out timer (TOT) Functions
  • User set mode (VX-P824 / VX-P829)
  • Minimum volume control
  • PC Programmable

Additional Features (Both modes)

  • RX/TX Battery Power Save

  • CTCSS / DCS Encode and Decode

  • Auto-Range Transpond System (ARTS™)

  • Compander
  • User Selectable Tone (VX-P824 and VX-P829)
  • Programmable 7-colour LED alert (2-Tone Mode)

  • Radio-To-Radio Cloning

P25 Digital Mode only features

  • AMBE+2™ Vocoder

  • Caller ID (VX-P824 / VX-P829)

  • RSSI Indicator and Audible Alert (VX-P824 / VX-P829)
  • AES/DES Encryption (options)
General Specification
Frequency Range 134 - 174 MHz 400 – 470 MHz
450 – 520 MHz
Number of Channels and Groups 512 and 32 Groups (VX-P829/VX-P824)
16 and 1 Group (VX-P821)
Power Supply Voltage 7.5 V DC ± 20%
Channel Spacing 12.5 / 20 / 25 kHz
PLL Steps 5 / 6.25 kHz
Battery Life (5-5-90 duty)
2300 mAh V87LIA

3000 mAh FNB-V92LI and FNB-V92LIIS

16 hours with saver / 12.4 hrs

19.7 hours with saver / 15.6 hrs

15 hours with saver / 11.5 hrs

18.7 hours with saver / 14.3 hrs
IP Rating IP 57
Operating Temperature Range -30° C to +60°C
Frequency Stability ± 2.5 ppm
Dimension (H x W x D) 96.5 x 57.5 x 40.6 mm (w/FNB-V87LIA)
Weight (Approx.)
VX-P821 model
348 g (w/FNB-V87LIA)
Transmitter Specification*
Output Power 5 / 2.5 / 1 / 0.25 W

16K0F3E, 11K0F3E
8K10F1D / 8K10F1E
Spurious Emissions 70 dB
FM Hum & Noise 46 dB / 40 dB
Audio Distortion < 3 % @1 kHz
*Measured by TIA/EIA-603
  • FNB-V92Li: 3000 mAh Li-Ion
  • FNB-V92LiIS: 3000 mAh Li-Ion Intrinsically Safe*
  • FNB-V87LiA: 2300 mAh Li-Ion
  • CD-53: Single unit rapid charger
  • PA-42H: AC Adaptor to suit CD-53
  • VAC-6920: Six unit rapid charger
  • MH-50D7A: Standard speaker with toggle
  • MH-66A7A: Submersible, noise cancelling speaker
  • MH-66B7A: Submersible speaker, two programmable keys and audio attenuator
  • Belt clips and leather cases are also available
Spec Sheet Downloads
Owner's Manual Downloads