HF/50 MHz ALL MODE TRANSCEIVER
ICOM IC-756PRO  

Taking the potential of the transceiver to heights unimaginable, until now.
The combination of the 32-bit Floating Point DSP and 24-bit AD/DA converter is loaded with superior digital functions never before available with previous DSP units. With the DSP controlled AGC loop management, it is now possible to achieve pure digital functions. The digital IF filter, digital twin PBT and manual notch, the elimination of radio interference, unrivaled transmission and reception S/N, ultra-low distortion transmission and reception tone quality etc., is delivered. The search by Icom for the ultimate HF transceiver, resulted in the 32-bit Floating Point DSP and 24-bit AD/DA converter, and brought to life in the IC-756PRO. The most striking impression of the ability of this technology is without a doubt, the performance of the digital IF filter.

32-bit floating point DSP
To dramatically increase the ability of all digital functions in this all mode transceiver, the latest technology has been used and a newly designed DSP has been created. The IC-756PRO, has employed an originally designed 32-bit floating point DSP unit. Along with this, sees the adoption of the 24-bit AD/DA converter making a formidable team with ample capacity. Especially with the receive signal input, the AD/DA converter provides ultra wide dynamic range, 144 dB*, of signal management. Clear signals without any distortion are realized even in any signal conditions, such as very weak or extremely strong signals from nearby stations. The DSP has extremely high performance processing ability, which dramatically improves signal resolution, as well as both transmission and reception S/N ratio, and allows more high performance features and properties.
*theoretical value at digital operation stage.

AGC loop management
The digital IF filter, manual notch filter etc. are adopted in the AGC loop, and controlled by the 32-bit floating point DSP. This system removes blocking by extremely strong adjacent signals in out of filter passbands. Therefore, you will never have to suffer blocking of the AGC again. The result is that even very weak signals can be extracted from the noise level in between crowded strong signals clearly! In addition, the AGC time constant, (three presettable slow, medium and fast) are flexibly adjustable for each operating mode to suit operating band conditions, operating style, etc.

picture(Example for setting time constant for the SSB, 2.5.)

RF speech compressor
The IC-756PRO has truly drawn the line between previous models and their standard equipped compressors. The 32-bit capacity provided from the DSP, allows the speech compressor to compress the transmitter IF signal, therefore, average talk power is increased. This function of course is effective for long distance communication, or when propagation conditions are poor. The IC-756PRO keeps the level of distortion to it's lowest extremity at maximum compression. In turn this ensures that your fellow ham enthusiasts are presented with quality readability. In addition, the transmit bandwidth is selectable, regardless of the speech compressor activity, from 2.2, 2.4 and 2.8 kHz to suit operating band conditions, etc.

Twin peak audio filter
A twin peak audio filter has been built in. 2 specified audio frequencies only are passed through the filter in the DSP for accurately receiving an RTTY signal, for a profound decoding rate. You will see a dramatic improvement in the quality of S/N, as well as removing interfering CW signals, etc.


Microphone equalizer
In the high/low sound ranges, there are 11 different levels respectively, which can set frequency properties. Totalling 121 varieties, equalized audio can be set with the built in microphone audio equalizer. Suitable transmit audio can be easily and freely set using the equalizer according to operating style, and your personal preference.

Manual notch capability
The 32-bit floating point DSP has also allowed the inclusion of possible manual notch operation, as well as equipping current auto notch function. The manual notch filter achieves more than 70 dB of attenuation level, and with it's sharp cutting characteristics, the manual notch function can accordingly be adjusted to beat unwanted signals, while protecting the desired signal^__very weak signals buried in extremely strong beat signals, can be received. Of course with the auto notch function, the notch frequency is automatically adjusted to follow interfering beat signals^__reducing interference from sweeping beat signals, etc.

DPSN
A digital PSN (Phase Shift Network) is employed at the modulator using an original 90° phase shifter architecture. The result is consistently reproducible, clear and high quality transmit audio for all voice operations. In addition, the DPSN also allows SSB operation with superior carrier suppression and unwanted sideband rejection ratio.

RTTY demodulator
The first in the world, the Baudot RTTY demodulator and decoder, boasting a superb decoding rate capability, is built-in. Of course, the received alphanumeric details of RTTY signal are indicated on the LCD display^__you don't need external units for RTTY receiving any more! The built-in tuning indicator, located at the top of the LCD, can visually recognize the tuning condition, and in combination with the 1/4 speed dialling function, allows quick and simple zero-in, even if you are new at or interested in RTTY receiving.

picture(Example for receiving an RTTY signal)

Digital noise reduction
The newly designed DSP digitally separates desired signal components from noise components. Outstanding signal to noise ratio is achieved, providing clean, clear audio in SSB, easy-to-copy RTTY and crisp, clear SSTV reception. In addition, the digital noise reduction has continuously adjustable noise suppression capabilities^__ complicated, high level of algorithms are instantaneously managed by the 32-bit floating-point DSP.

CW wave form
With the CW wave form being created in the DSP^__it now has been made possible to materialize CW transmissions with desired leading and trailing edge characteristics. The characteristics are selectable from 4 available steps to suit your operating style. 2, 4, 6 and 8 msec. characteristics are available

5-inch TFT color LCD
The first in an HF transceiver! The IC-756PRO is Icom's prized product, and has adopted a 5-inch TFT color LCD that offers a concentrated indication of various information recognizable at a glance. 4 colors and 7 types of fonts can be selected at your personal preference. Separated into an upper and lower screen, the TFT color LCD will be sure to offer that all important quick operation.

Spectrum scope
A real time spectrum scope is ideal for monitoring conditions around the displayed frequency (including relative signal strengths). With the main frequency displayed at the center, the sweep frequency range (span) is selectable from four individual levels; ±12.5 kHz, ±25 kHz, ±50 kHz, and ±100 kHz for convenient observation at a glance. Furthermore, IC-756PRO's spectrum scope sports full dot LCD features, including a peak hold function that can set 2 contrasting colors if preferred^__ Making distinction between bands easy, and especially for detecting on air stations, has an unsurpassed capability.

picture(Spectrum scope screen (peak-hold function ON))

Performing foundations
The IC-756PRO covers a wide frequency range, 30 kHz to 60 MHz (except some frequency bands), with superior performance. A wide dynamic range of 105 dB* and a high intercept point of +23 dBµ*! Of course, Icom's original DDS (Direct Digital Synthesizer) is adopted, and it provides a superior C/N ratio.
*Not guaranteed; Rx: 14.1 MHz, interfering freq.: F1=14.2 MHz, F2=14.3 MHz; IF passband width=500 Hz

High frequency stability
A high stability crystal unit, CR-338, is used for the PLL reference oscillator, allowing ±0.5 ppm (-10°C to 50°C) of extremely high stable operation.

Digital voice memories
Weather you're contesting or on a DX'-pedition, the digital voice memories are a built-in feature you'll really appreciate. A total of 8 memories, 4 each for transmit and receive, with 15 sec. of storage space per location, use the recorder for calling CQ, reporting call sign, or any other continuously repeated audio. Of course record and playback audio quality is remarkably high.

picture(Example for transmitting condition of recorded contents (T1).)

Highly stable transmitter
The IC-756PRO has a newly adopted high rating power transistor (2SC5125 × 2) in the PA circuit, and with the realization of superior IMD characteristics, this all mode transceiver easily ensures an output of 100 W. The SSB modulator has also been able to adopt the PSN modulator in the 32-bit DSP. This creates a 10 dB improvement in the S/N ratio compared to previous models. Advanced design considerations along with an aluminum, diecast frame, and large cooling fan, help to stabilize the PA circuit providing this 100%, full duty cycle operation.

Digital Twin PBT
Proving hard to beat, the IC-756PRO's digital twin PBT shows extraordinary sharpness of cutting in on interfering signals. The twin PBT narrows the IF passband in one stage, and efficiently eliminates any interfering signals limiting delay in operation. The new digital twin PBT function is especially useful during crowded band conditions such as pileups, contests, etc. Of course, the twin PBT conditions, such as tuned value (50 Hz step), direction, and passband width, are indicated on the LCD for easy recognition. This digital twin PBT will prove to be one of those most vital functions when hunting for DX stations.

High performance memory keyer
CW operators working long hours will appreciate the 4 channel memory keyer. The entire memory channel contents may be viewed on the display^__no need to memorize the contents yourself. A maximum of 55 characters may be recorded. A serial contest number auto counter is built in, viewable on the TFT.

picture(Example for editing a memory channel 2 (M2).)

Analog and digital meters
In addition to the built-in, large analog S/RF meter, the IC-756PRO employs a digital S/RF meter. Output power, ALC level, speech compression level and VSWR ratio are simultaneously indicated while transmitting, and peak hold function is available while signal strength level is indicated during receive.

picture(Digital meter screen)

Set mode condition list
All set mode items are classified into 4 groups and a maximum of 9 items can be easily called up onto the display. Settings are simple and straight forward.

picture(Level setting screen)

Complete CW features
CW enthusiasts won't be disappointed. All of the following capabilities are included in the IC-756PRO;

• Continuously adjustable CW pitch control, from 300 to 900 Hz
• Multi-functional electronic keyer includes continuously adjustable keying speed and dot/dash ratio, from 7 to 56 wpm and from 2:8:1 to 4:5:1, respectively.
• Double key jacks^__one each for front and rear panels
• Full break-in (QSK) respondence

Superior receive IMD
A 4-element system is employed for receiver mixer circuits, providing superior inband receive IMD, especially from near-by interfering signals, and a well-designed triple-conversion system to help minimize image and spurious responses for better signal fidelity, is also standard.

Dual watch
This function allows you to receive 2 signals on the same band simultaneously. You can conveniently monitor a DX station while operating on another frequency. To appreciate and fully enjoy HF, the IC-756PRO now makes DXing and hunting for those rare stations possible, as well as making your transceiver respondent to high degree contesting.

Memory pad
The memory pad function stores up to 5 operating frequencies and modes for easy write and recall. These memory pads are separate from the included memory channels, and are convenient especially when finding a DX station in a pile-up, or when a station is busy for a long time and you want to temporarily search for other stations^__ Use memory pads instead of your hastily scribbled notes

Other outstanding features

• Triple band stacking register
• Quick split function with split lock capability
• Built-in antenna tuner covers HF through 50 MHz of amateur bands
• AH-4 control circuits
• Dial lock
• Band edge beep (OFF also selectable)
• Independent RIT and .TX control for each main and sub bands
• Dual antenna system
• VOX
• 2 levels pre-amplifier and 3 levels attenuator
• Auto TS function
• CI-V interface capability with the optional CT-17
• Noise blanker
• Programmed, Memory, Select memory and .F scans
• 101 memory channels (incl. 2 scan edges) with 10-character memory note
• Optional voice synthesizer announces operating frequency, mode, as well as receiving signal strength
• 50 frequency tone encoder built-in, and more...