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Icom IC-7700

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Icom IC-7700

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Quick Overview

H.F & 6m Base Radio (200W)


Double conversion super-heterodyne system

While multiple IF stages often become a cause of signal distortion and spurious emissions, the IC-7700 utilizesa simple double conversion super-heterodyne system using our original image rejection mixer. A high performanceD-MOS FET array for the 1st mixer stage is infused with a signal from the high-level C/N, high-drive LocalOscillator from the PLL unit. This mixer reduces signal distortion through IF processing and provides a high-fidelitysignal to the DSP unit.

110dB dynamic range and +40dBm 3rd order Intercept Point (IP3)

There is a trade-off between sensitivity and IP3 figure. So by sacrificingradio sensitivity, the IP3 figure of a radio will increase.However, Icom considers this non-sense. To achieve a REAL highperformance machine, the whole analog circuit was reviewed andthe IC-7700 employs mechanical relay BPF switching, digital preselector,three roofing filters and a simple double super-heterodynesystem. And the analog circuit was well-balanced to the DSP units,the IC-7700 provides superior performance in sensitivity, and asuperb dynamic range of 110dB, +40dBm IP3 (even in strict USBmode (2.4kHz filter width).

More than +110dBm 2nd order intercept point (IP2)

More than +110dBm IP2 means the 2nd order distortion fromstrong broadcast stations will be completely rejected. The endlesspursuit of leading analog circuit engineering makes it possible toachieve this high specification.* Measurement was made with custom made measuring equipment, due tonormal signal generator (SG) and duplexers are limited to about +85dBm.The figure of IP2 is typical value.

High specification inband IMD

Inband IMD (intermodulation distortion) is undesired modulation (2nd, 3rd or higher order) caused by the non-linearprocessing of received multiple signals. The IC-7700 has superior IMD figures in every order of IMD figures.These differences in the IMD figures will be evident especially in CW mode. The sound of the received audio willchange and you will be able to copy a weak signal buried in internal distortion or noise.

Band pass filter and mechanical relays

To eliminate as much distortion as possible, the use of semi-conductorshas been reduced to the absolute minimum in the highamplitude switching circuit. The IC-7700 also uses large coil condensersin the filter structure.Mechanical relays and large toroidal coils and condensers whichare resistant to magnetic saturation are also used to prevent distortionbefore the input of the band pass filter, and provide superior linearity.

DIGI-SEL (Digital pre-selector) function

The DIGI-SEL function rejects unwanted suppression by out-of-pass band interference at the primary stage ofsignal processing. It is useful to reject unwanted out of band interference from multi-multi operation or strongbroadcast stations. Within the HF bands, the DIGI-SEL automatically tracks the intended signal at a minimum of2 kHz steps keeping the pre-selector’s bandwidth centered on the operating frequency.The DIGI-SEL has a sharp-pointed very narrow peak characteristic in the pass band. Together with the bandpass filter it greatly attenuates out of the pass band. This combination reduces 2nd, 3rd and even higher orderIMD components immensely. The center frequency of the pre-selector is manually adjustable from the DIGI-SELtuning knob on the front panel.


The IC-7700 has a total of 4 pre-amplifiers, two for the HF bands and two for the 50MHz band. The purpose ofpre-amplifiers is to improve receiver sensitivity; for the pursuit of higher gain and a better noise figure.The IC-7700 employs a noiseless feedback design with push-pull amplifiers. Using feedback transformers, thepre-amplifiers provide a high IP3 while keeping a low noise figure.

1st mixer

The mixer element SD5400, used in the IC-7700 applies a 16V peek to peek voltage LO signal. Icom’s widebandpower-amplifier technical know-how is used in this mixer to generate such a high-level LO signal.

Three filters including 3kHz

The IC-7700 employs three filters of 15kHz, 6kHz and 3kHz before the 1st amplifier.Icom ordered special customized high specification devices to improve IMD and achieve better impedance characteristics.As a result, the 3kHz roofing filter provides approximately 134dB of blocking dynamic range andallows you to pull out a weak signal while blocking strong adjacent signals.* At 14.1MHz receive, with 5kHz separation of interference signal.

High stability OCXO unit

The frequency control of these circuits is done by the high stabilityOven Controlled Crystal Oscillator unit. This OCXO unit has±0.05ppm high stability on the basis of temperature. That meansthat within the specified temperature range, the frequency willdeviate only 5Hz out of every 100 million Hz! This specification isequivalent to that specialized measuring equipment. Also, a10MHz reference frequency can be the input/output for externalequipment.

7-inch wide color TFT LCD

Response time, color, resolution, visibility - the IC-7700’s display has been examined for all aspects, and anactive matrix 7-inch (800 × 400 pixels) TFT color display was selected. This large display shows operating frequencies various settings and operating conditions as well as spectrum scope, S-meter and RTTY/PSK31decoded messages. The S-meter shows near analog like needle swings that are smooth and accurate. In addition to the 3 styles of digital meter, the IC-7700 has digital multi-function bar graphic meters to show various conditions, such as Final PA temperature, PA voltage etc. Further more, the IC-7700 has a VGA connector for an external monitor and an S-meter connector for an external analog S-meter.

USB ports on the front panel

Two USB ports on the front panel, allowing you to easily connectUSB type keyboard or USB memory stick to save transceiver settings,update firmware, or transfer settings to other IC-7700's.

RTTY /PSK31 operation without PC connection

The IC-7700 has a built-in modulator and demodulator for RTTY and PSK31 modes. By simply connecting aUSB keyboard, you can immediately get on with enjoying these modes. In addition, you can pre-program transmitmessages in the internal message memory or a USB memory stick and transmit them without connecting aUSB keyboard. Also, received messages can be stored to a USB memory stick and transferred to your PC.

4 antenna connectors

The IC-7700 has 4 antenna connectors (ANT1 to ANT4) with an automatic antenna selector. Once you programthe operating band to the antenna memory, the antenna memory automatically selects the antenna as youchange the operating band. Each antenna can be set to the antenna usage type such as for Tx/Rx use, Rx only*use and off line. The antenna switch button allows you to change operating antenna temporarily.* Rx setting is available for ANT4 only.

Triple band stacking register

With the push of a band button, the band stacking register allows you to simply bring back the last three operatingsettings (including antenna setting) per band for simple recall. This function is convenient when you operate3 modes such as SSB, CW and RTTY on one band.

Real time spectrum scope

With the dedicated DSP unit for the spectrum scope, the IC-7700achieves 80dB of dynamic range at the signal input level. It alsoimproves the scope response time and signal resolution, so that itis possible to accurately tune to the intended signal as you see iton the spectrum scope screen.The spectrum scope range can be set independently from thereceiving frequency. You can monitor the band condition betweenthe selected sweep edges (Fixed mode), as well as sweep aselected band width centered on the receiving frequency in thescope screen (Center mode).In addition, the scope has many features including scope attenuator (10dB/20dB/30dB), 2 types of marker(Transmit, Receiver) and Max hold function. The mini scope function is convenient for continuous monitoringeven while adjusting the set mode.

Digital IF filter

When receiving a weak signal buried between adjacent channels, the DSP-based digital IF filter shows its superiorfiltering performance. Depending on the operating situation, for example handling a pile-up, or receiving avery weak signal, you can flexibly change sharp and soft filter shapes or narrow or shift the filter width, evenwhile actually receiving a signal.Manual notch filter and auto notch filterThe manual notch filter controlled by the DSP unit has extremely sharp characteristics and provides more than70dB of attenuation. The notch filter width is selectable from 3-types, allowing you to select the suitable filterwidth depending on the operating mode and band. It eliminates persistent beat tones without affecting the AGC loop function. And more, the automatic notch filter tracks 2 or more interfering signals such as beat signals and RTTY signals.

Digital twin PBT

The DSP-based digital IF filter of the IC-7700 blocks out signals out of the pass band, and keeps the in-bandsignal free of any distortion or depletion in quality. In addition, sharp and soft filter shapes are selectable. Youget the signal reproduction you like to hear. The digital twin PBT eliminates interference and noise from theupper and lower sides by changing the IF filter bandwidth. The IF shift function allows you to shift or move theIF pass band from either side to hear the actual signal. The passband width, shift direction and steps (50Hz) aregraphically displayed on the LCD.

Noise reduction

The 32-bit floating point DSP has excellent calculation performance, which processes complex and sophisticatedalgorithms. This allows the DSP to attenuate noise without delay and extracts noise-level signals. It is possibleto vary the suppression level in 16 stages.

Variable noise blanker

The noise blanker provides significant reduction of pulse-type noise. The noise blanker allows the operator tochange the threshold level as well as blank time parameter and attenuation level.

Digital Voice Recorder

The Digital Voice Recorder (DVR) is a convenient function for contests, DX-peditions, field day and even normaloperation. Record your callsign, CQ, or other station information into a memory. Independent "Record(REC)" and "Play" buttons are on the front panel.

S/P DIF interface

The IC-7700 has the S/P DIF optical digital interface for audio output and modulation input. By connecting an externaldevice* through a connection cable, flexible audio tuning is possible, while keeping good sound quality.* Third party connection cable, PC with S/P DIF supported sound board and software are required.

New RX HPF/LPF setting

The IC-7700 has the RX HPF/LPF setting for each mode. Thehigh-pass filter and low-pass filter are adjustable for each mode.

200W output power at full duty cycle, full power operation

The IC-7700 uses two MRF150 power amplifiers connected inpush-pull-parallel. The power amplifiers provide a reliable 200W ofoutput power up to 54MHz. The effective quad cooling fan systemmakes it possible to generate 200W full power output even duringfull duty cycle operation.The digital PSN modulator using a dedicated DSP unit consistentlyreproduces an outstanding signal-to-noise ratio, providing cleanand clear transmission. The PA amplifier works with 48V DC andprovides all of the output power with low IMD in all bands.

Other outstanding features

  • High speed automatic antenna tuner covers HF and 50MHz bands. BNC type RX IN/OUT connectors for receiver antenna or external attenuator
  • General coverage receiver covers from 30kHz to 60MHz(* Some frequency bands are not guaranteed, depending on version). 4-step attenuator (6/12/18dB and OFF) . Twin peak audio filter for RTTY operation
  • Low distortion RF speech compressor . Tx monitor. 50 CTCSS tone encoder and decoder . VOX capability (Voice operated transmission). All mode power control
  • Multi-function electronic keyer with adjustable keying speed, dot-dash ratio and paddle polarity and bug keyfunction. APF (audio peak filter) function with soft/sharp filter shape. The normal (default) CW carrier point is selectable from USB and LSB mode.. CW pitch control from 300 to 900Hz . DSP controlled CW keying waveform shaping. Double key jack system . Full break-in function. Frequency lock function for split operation . CW/AM auto tuning function
  • Memory pad stores up to 10 (or 5) operating frequencies. Built-in voice synthesizer announces operating frequency, mode and receiving signal strength. Programmed scan, memory scan, select memory scan, VSC scan and ÝF scan. Set mode function for flexible and speedy setting . Quick split function. SSB/CW synchronous tuning . Single knob control from squelch volume to RF gain. RIT and ÝTx variable up to }9.999kHz . Quick RIT/ÝTX clear function. UTC/Local Clock and timer function . 1Hz pitch tuning and 1Hz indication. 101 memory channels with 10-character comment . Auto tuning step function. Dial lock . Main dial tension control. Band edge beep . CI-V interface capability. RS-232C connector for PC connection . BNC type Transverter connector. External speaker connectors . FFT scope wave averaging function. Screen saver function

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