Everything you'd expect in a business radio
... Plus Digital!


128 Channels with 8 Zones

Ample 128 channel capacity allows most companies plenty of room to grow. Up to 8 zones lets you group together channels in logical fashion.

Built Military Rugged!

The tough aluminum die-cast chassis and polycarbonate front panel have been tested to the MIL standard 810 F.

Compact Hand Microphone

Select from 5 levels of mic gain, for clearer transmission.

GPS Receiver Connection

With optional D-SUB 25-pin ACC cable OPC-2078, an external GPS receiver or PC can be connected.

Note:No Digital Modulation "IN" using accessory cables.

8-Character LCD

An 8-character alphanumeric LCD with user-friendly icons shows a variety of information and operating status such as caller's name, received message, etc.

Large Programmable Buttons

For easy access to often used functions, P0-P3 buttons are programmable to meet specific needs. Buttons and LCD display are backlit for night time opeartion.

Powerful, Front-Facing Speaker

4 watts (typ.) front facing speaker delivers clear and loud audio throughout a vehicle's cabin. Digital modulation adds distinct clarity to received voices.

IDAS™ Digital Mode Operation

The IC-F5121D series provides NXDN™ CAI-based IDAS digital mode operation. It is also compatible with IDAS multi-site conventional and IDAS single-site trunking. The following IDAS features are programmable.

  • PTT ID
  • Individual/Talkgroup list (Max. 500)
  • RAN (Radio Access Number)
  • Status
  • SDM (Short Data Message)
  • Call alert
  • Radio check (RX)
  • Stun/kill/revive (RX)
  • Remote monitor (RX)
  • Emergency (No ACK)
  • Digital voice scrambler
  • GPS data (PC and software required to show received position data)

Built-in 2-Tone and 5-Tone (Analog mode)

2-Tone and 5-Tone signalings give you selective calling, quiet stand-by and other convenient functions with programming. The stun/kill functions disable a radio over the air and the revive function restores the stunned radio.

MDC 1200 Compatible (Analog mode)

The following MDC features are available with the built-in MDC signaling.

  • PTT ID
  • Radio check (RX)
  • Emergency (No ACK)
  • Stun/Revive (RX)
  • 500 alias table (Max.)

Scan Features

The priority scan allows you to monitor one or two priority channels while scanning other non-priority channels. The TX channel and talk back functions allow you to make a quick response while scanning.

Lone Worker Function

When the radio is not operated for a preset period, a warning beep will sound, alerting the radio user to check in. If the radio user does not check in before the preset time runs out, then the radio automatically sends out an emergency signal.

Optional Active Noise Canceling Microphone

The optional active noise canceling microphone HM-211 can automatically reduce noise in extremely noisy environments and assist in transmitting clear and accurate audio.

Watch the HM-211 performance video:

Other Features

  • CTCSS/DTCS encoder/decoder*
  • 8 DTMF autodial memories
  • Microphone hanger action programmable
  • Optional DTMF microphone (HM-152T)
  • PC programmable
  • Power-on password function
  • Time out timer
  • Talk around function
  • Nuisance delete function*
  • Forced narrow function*

* analog only

TX: Transmit, RX: Receive


IC-F5121D IC-F6121D
Frequency coverage



Number of channels

128 channels (8 zones)

Channel spacing



Type of emission




Current drain
Tx High



Rx Stand-by


Max. audio


(projections not included; W×H×D)

150×40×167.5 mm;
5.91×1.57×6.59 in


1.1kg; 2.4lb

* 25 kHz and 30 kHz bandwidth are no longer available for FCC Part 90 licensees for USA versions.


IC-F5121D IC-F6121D
RF output power (at 13.6V DC)

50W, 25W, 5W
(Hi, L2, L1)

45W, 25W, 4.5W
(Hi, L2, L1)

Spurious emissions

72dB (min.)

Frequency stability


Audio harmonic distortion

3% typical
40% deviation

FM Hum and Noise

46/40dB typ.

40dB typ.

Digital FSK error 5% max.


IC-F5121D IC-F6121D

0.25μV typ. (at 12dB SINAD)
0.18μV typ. (at 5% BER)

Adjacent channel selectivity

80/70dB typ. (Wide/Narrow),
65dB typ.

70dB typ.
60dB typ.

Spurious response rejection

70dB min.

Intermodulation rejection

75dB typ.
70dBμV emf type. (Digital)

75dB typ.
70dBμV emf type. (Digital)

AF output power
(at 5% distortion with an 4Ω load)

4W (typ.)

Applicable U.S. Military Specifications

Icom makes rugged products that have been tested to and passed the following MIL-STD requirements and strict environmental standards.


MIL-810 G

Method Procedure
Low Pressure Storage 500.4 I
Low Pressure Operation 500.4 II
High Temperature Storage 501.4 I
High Temperature Operation 501.4 II
Low Temperature Storage 502.4 I
Low Temperature Operation 502.4 II
Temperature Shock 503.5 I
Solar Radiation 505.4 I
Humidity Induced 507.4 -
Settling Dust 510.4 III
Vibration 514.5 I
Shock Functional 516.5 I
Shock Transit Drop 516.5 IV

Also meets equivalent MIL-STD-810-C, -D -E and -F.
All stated specifications are subject to change without notice or obligation.

Supplied Accessories

  • Microphone, HM-152
  • Microphone hanger and its cable
  • Mounting bracket kit
  • DC power cable
  • Function name sticker

Catalogs / Brochures

Instruction Manual / Guides

Name Model Name Note
Instruction Manual IC-F5120D series, IC-F6120D series
Operating Guide IC-F51210D/F6120D series (MDC / IDAS operation)