Feature 6

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Operational Functionality for the Most Advanced Operators

Digital Voice Recorder

The digital voice recorder captures both receive and transmit audio to your SD or USB storage devices. Up to 9 hours of continuous audio recording is possible with 2 GB of storage. Record your QSO with a rare entity or record your operating time in a contest. Operating frequency, mode, S-meter and output power are automatically captured.

Recorded list display

Memory Keyer

Whether operating phone, CW, RTTY or PSK31/63, the IC-7851 has a convenient memory keyer to ease operations. Record your CQ, station information or other items in one of 8 keyer memories for the CW and digital modes; 4 memories for phone operation. For CW, the memory keyer has timesaving functions like auto repeat, contest serial number counter and short Morse number functions. For phone operation, you have a voice-saving auto repeat function.

Improved Automatic Antenna Tuner

The automatic antenna tuner utilizes tune setting memories to record the best tuner configuration for the lowest SWR. This allows a faster response time when jumping bands or moving around in the same band.

Internal Memory Switch

With six antenna ports – two receive-only and four receive/transmit – the IC-7851 enables the operator to have fingertip control over a vast array of antenna configurations. Switch to 80/160m and you want to use your beverage antenna for receive, but transmit on your vertical. Not a problem: the antenna switch memory will automatically switch antennas when you select the band you want to operate. This is very convenient when using the RS-BA1 for remote base operation.

Enhanced PC Connectivity

The IC-7851 has various computer interfaces, giving you maximum connectivity between your computer and radio. Digital modes become a snap when controlling with the USB port. USB audio and some CI-V commands including USB send (DTR/RTS) and USB keying (CW and RTTY) are selectable. You can also interface your computer with the S/P DIF optical digital interface provides audio I/O. The Ethernet jack allows you to connect the IC-7851 directly to your router and control your radio over your wireless Internet, or travel the globe and operate your station remotely over the Internet.

Firmware Update Capability

The IC-7851 can grow as feature and function enhancements become available via the USB or your SD Card.

Simplified Remote Control

Remote base operation is made easy as the IC-7851 operating system incorporates the remote base server software. A computer is not required in the shack for audio or rig control. Up to three, unique user log-in/password configurations are part of the internal server. As the rig control has a priority of service, the controls will feel like you are right in front of your rig.

Optional RS-BA1 main features

  • Most functions of your transceiver, including interference rejection functions and IF filter settings, can be controlled. Also, received signal strength and SWR can be observed on the computer display.
  • Received voice recording function.
  • Optional RC-28 USB remote encoder provides a hardware dial/transmit functions for a realistic dial operation.
  • The IC-7851 can wake-up from the standby mode through the RS-BA1 software.

Other Outstanding Features


  • BNC type RX input/output connectors for receiver antennas or external attenuators


  • General coverage receiver covers from 30Hz to 60MHz* (* Some frequency ranges are not guaranteed.)
  • Two types of preamplifiers:
    Preamp 1: improves intermodulation characteristics
    Preamp 2: High gain preamp for high bands
  • A seven step attenuator (3, 6, 9, 12, 18, 21dB and OFF)
  • A dedicated 50MHz band mixer using a Quad FET
  • Twin peak filters for better RTTY signal reception


  • Speech compressor increases average talk power (SSB mode)
  • TX monitor functions
  • Fifty sub-audible tones (CTCSS) for repeater access
  • VOX (Voice operated transmission) capability
  • All mode power control


  • DSP controlled CW keying waveform shaping
  • Multi-function electronic keyer with adjustable keying speed, dot/dash ratio, keyer type, rise time and paddle polarity
  • Electronic keyer speed popup
  • CW pitch control from 300 to 900Hz (5Hz pitch)
  • CW reverse mode operation for receiving USB side signal
  • Double key jacks for front and rear panels
  • Full break-in and semi break-in functions
  • CW/AM auto tuning function helps to zero in on intended signals within ±500Hz range
  • Soft and sharp audio filter shapes for the Audio Peak Filter (APF)


  • Set mode functions for flexible and speedy settings
  • Memo pads stores up to 10 operating frequencies and modes
  • Quick split function and split lock functions
  • Quick Dualwatch function
  • SSB/CW synchronous tuning
  • RIT and ⊿TX variable up to 9.999kHz
  • UTC/Local clock and timer function
  • 1Hz pitch tuning and display
  • 101 memory channels with 10-character channel name
  • Built-in voice synthesizer announces the operating frequency, mode, and S-meter level
  • Programmed scan, memory scan, select memory scan, VSC scan and ⊿f scan
  • Auto tuning step function
  • Dial lock function
  • Main dial tension control
  • Programmable band edge beeps
  • S/P DIF input/output connectors
  • BNC type transverter connector
  • External speaker connectors for Main/Sub receivers
  • FFT scope waveform averaging function for PSK and RTTY decoder
  • Screen saver function