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Ethernet Connector (LAN)

Other Outstanding Features

[Antenna]

•   B N C   t y p e   R X   i n p u t / o u t p u t   c o n n e c to rs   fo r  

receiver antennas or external attenuators

[Receiver]

• 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

[Transmitter]

• 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

Base station

[CW]

• 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)

[Operation]

• 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 operat-

ing frequency, mode, and S-meter level

•   Pr o g r a m m e d   s c a n ,   m e m o r y   s c a n ,   s e l e c t  

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 wavefor m averaging function for 

PSK and RTTY decoder

• Screen saver function

Main Switch

AC Power Cord 

Receptacle

S/P DIF In/

Out Jacks

USB Connector (Type-A)

External Display 

Connector (DVI-I)

Breaker Switch

Ground Terminal

ALC Level Pot

Antenna Connectors

Reference Frequency 

In/Out Jack

Receive Antenna 

Connectors B

Transverter Jack

Receive Antenna 

Connectors A

CI-V Remote Control Jack

S-meter 

Output

Jack

External Keypad Jack

Key

Jack

ALC Input 

Jack

TX/RX 

Control Jack

(Relay)

ACC Socket B

ACC Socket A

USB Connector

(Type-B)

External DC
Output Jack

External Speaker 

Jacks

• Most functions of your transceiver, including interference rejection func-

tions 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 func-

tions for a realistic dial operation.

• The IC-7851 can wake-up from the standby mode through the RS-BA1 software.

IP Network

PC (Remote station)

Windows

®

 PC

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. 

Simplified Remote Control (Optional RS-BA1)

Optional RS-BA1 main features

6

Summary of Contents for IC-7851

Page 1: ...THE TRANSCEIVER...

Page 2: ...the design of the IC 7851 Icom s engineers focused on a new Local Oscillator LO that drastically reduces the phase noise As a result of this design the purity of the LO achieves a Reciprocal Mixing D...

Page 3: ...ssive 20dB improvement is seen with the IC 7851 s 10 kHz measure ment and more than 30dB improvement at a 1 kHz measurement in com parison to the IC 7800 Phase Noise Characteristics Comparisons Receiv...

Page 4: ...r filtering by watching filtering adjustments take out interfering signals including filter width and notch filter placement The processing power in the IC 7851 allows for dual mini band scopes as wel...

Page 5: ...851 has multiple AGC loops The AGC voltages detected in front of and behind the digital IF filter in the DSP unit The first AGC loop prevents saturation of the 1st IF amplifier The other AGC loop dete...

Page 6: ...eble The receive audio can be tailored with mode specific Bass Treble or audio passband settings Digital Twin PBT Passband Tuning Once the IF filters have been tweaked the op erator has additional con...

Page 7: ...synthesizer announces the operat ing 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...

Page 8: ...V 2 V 0 5 V 28 29 9MHz 50 54MHz 0 13 V 1 V 0 32 V SM 50 DESKTOP MICROPHONE IC PW1 IC PW1EURO HF 50MHz 1kW LINEAR AMPLIFIER SP 34 EXTERNAL SPEAKER Automatic antenna tuner and compact detach able contr...

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