HF/50/144MHz ALL MODE TRANSCEIVER
Large, multi-function LCD ––––––––––––––––––
The large multi-function LCD displays frequency, 9-character channel name, channel number, multi functional meter
(includes S-meter, RF output, SWR and
ALC level) and other operating status. The
dot-matrix portion of the LCD shows the
following items:
• Channel name • Function key assignment • Band Scope • RTTY decoder screen • Memory keyer contents • Graphical SWR scale
RTTYdemodulator and decoder ––––––––––––––
The built-in RTTY demodulator and decoder reads baudot RTTY signals on the
screen without turning on your PC or other
gear. The R TTYtuning indicator helps critical tuning. The Twin Peak filter removes
interfering QRM giving you a more accurate decoded message.
Ample CW functions––––––––––––––––––––––––
Multi function electronic keyer, variable dot/dash ratio (2.8:1 to 4.5:1) and
key speed (6-60 WPM), paddle polarity, bug key etc. CW pitch is adjustable (300 to 900Hz). Full break-in capability. Double key jacks – one
each for front and rear panel.
Memory Keyer ––––––––––––––––––––––––––––
4 channel memory keyer stores up to 50 characters with serial contest number
auto-counter, morse cut number and auto repeat function. In addition, a user
supplied external keypad* controls the memory keyer from your finger tips.
* Not supplied by Icom.
Built-in antenna tuner ––––––––––––––––––––––
The internal antenna tuner matches the HF and 50MHz bands automatically. After operating on a band for the first time, the tuner memorizes the
selected antenna and preset point providing for very high speed tuning. 2
antenna connectors for HF and 50MHz bands and 1 for 144MHz band is
equipped on the IC-746PRO.
SSB/CW Synchronous T uning––––––––––––––––
You no longer have to worry about losing a CW signal while tuning with
SSB mode. With the SSB/CW synchronous tuning, the frequency automatically shifts when you change modes.
V oice Squelch Control (VSC) function
––––––––––
The Voice Squelch Control function opens the squelch only when receiv ing a modulated voice signal.
Other outstanding features ––––––––––––––––––
• Triple band stacking register • 2 types of preamplifier (Regular and Higain) for HF and 50MHz bands, 1 for 144MHz band • 20dB RF attenuator
• Level adjustable noise blanker (101 steps) • BPF function below 500Hz
band width in SSB mode • 1/4 speed dial tuning function for SSB-data,
CW and RTTY modes • 108 selectable DTCS and 50 selectable CTCSS
with encoder/decoder • 1750Hz tone encoder • Optional high stability
crystal unit, CR-338 • Up to 10 memo-pads temporarily store frequencies
and modes • Quick split function with split lock function • ± 9.99kHz RIT
and ∂TX • Band edge beep • CI-V capability for PC control • VOX • Program, memory, select memory and ∂F scans • IF transmit audio monitor
(SSB mode only; AF transmit audio monitor for the other modes) • 102
memory channels • 9600bps data terminal • AH-4 control circuits • Auto
TS function • Optional voice synthesizer unit, UT-102 announces the operating frequency, mode and S-meter level • 1Hz tuning and indication
Digital twin PBT––––––––––––––––––––––––––––
Only Icom brings you Twin Passband tuning! Tailor
your IF passband with the Twin PBT by electronically
shifting the upper and lower IF passbands. Depending
on the use of the concentric knobs, you can either narrow the IF passband, or shift the entire passband to
eliminate interfering signals.
Manual notch filter
––––––––––––––––––––––––
Interference management is not a problem with the Manual Notch filter. With it’s
incredible 70dB attenuation, the manual
notch can eliminate a wide variety of
QRM. The Automatic Notch Filter can
track two or more interfering signals like
Heterodynes and “Key uppers”!
Digital noise reduction ––––––––––––––––––––––
By digitally manipulating the incoming signal, the DSP is able to reduce
various types of noise and enhances the receive signal components. Providing an outstanding signal to noise ratio to give clean, clear audio.
AGC loop management ––––––––––––––––––––
Another first in this class of transceiver, the IC-746PRO incorporates a
multiple AGC loop management system, which uses the DSP filtering to
remove unwanted signals from the AGC control. This means, if an unwanted signal is removed using the DSP, the AGC will not be affected. In
other words, “No more pumping of the AGC!”
Also, the AGC is independently controllable for mode
and the time settings.
(Off, 0.1-6.0 or 8.0 sec.)
Microphone Equalizer ––––––––––––––––––––––
Bring Hi-Fidelity to the amateur airwaves. The Microphone Equalizer will
change your RST from “59” to “Great Audio” and “Nice Signal”. Adjust
your audio for Bass and Treble characteristics to total 121 levels for all
voice operation. The transmit filter width in SSB mode is selectable from
2.8/2.4/2.2kHz.The Rx tone control is also an equalizer for the received
audio. As with the transmit audio, select the amount of Bass and Treble
you need for the audio clarity you want.
Digital RF Speech Compression ––––––––––––––
Need more punch in your signal; the Icom Digital RF Speech Compression gives you all you need without fuss and noise. Great for breaking
through QRM.
HF + 50MHz + 144MHz All Band Coverage ––––––
Covering all HF bands as well as 50MHz and 144MHz, the IC-746PRO
all mode transceiver also includes a general coverage receiver from
0.03–60MHz and 108-174MHz* with full IF DSP capability.
* Specifications guaranteed 0.5–29.99, 50–54 and 144–148MHz only.
Continuous Duty at 100W––––––––––––––––––––
The bipolar 2SC2694’s are used to provide a clean 100 watts of output
power for SSB, CW, RTTY and FM modes. (40W in AM). The die-case
aluminum chassis and the variable speed cooling fan enables the IC746PRO to transmit full power all the time*; the perfect companion for
those digital mode contests.
* On a 50Ω load at room temperature.
Starting with the 32-bit DSPprocessor and 24-bit AD/DAconverter,
Icom enables the ham radio operator to create the listening environment that best suites the current band and operating conditions.
All mode digital modulation and demodulation
Let’s start with the modulation and demodulation of the signals. For
signal purity and clarity , an all mode digital PSN
(Phase Shift Network)
system has been incorporated into the DSP system. For transmit,
this greatly reduces the intermodulation distortion, producing the
highest quality transmit audio. While the PSN separates the signal
from noise by phasing out noise and other unwanted signals.
IF filter shapes
Next is the IF filters. You will never have to purchase optional filters, with over 51 different filter widths, just dial in the width you
want. Then select weather you want a sharp or soft filter shape
for SSB and CW modes. For the Digital operators, your digital filters are separate from the SSB filters.
Speech compressor ONSpeech compressor OFF
2.5ms/Div2.5ms/Div
100W
Comparison of receive signal speaker output
NR ON
NR OFF
20
–20
–40
–60
–80
–100
–600–400 –200 0 200 400 600 800
[Hz]
[dB]
0
–800
Manual Notch Characteristics
32-bit Floating Point DSP
24-bit AD/DA Converter
32-bit Floating Point DSP
24-bit AD/DA Converter
HF/50/144MHz ALL MODE TRANSCEIVER
500Hz
0
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–600–800 –400 –200 0 200 400 600 800
[Hz]
[dB]
Soft for CW
500Hz
0
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–600–800 –400 –200 0 200 400 600 800
[Hz]
[dB]
Sharp for CW
Sharp for SSB
2.4kHz
0
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–3000 –2000 –1000 0 1000 2000 3000
[Hz]
[dB]
Soft for SSB
2.4kHz
0
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–3000 –2000 –1000 0 1000 2000 3000
[Hz]
[dB]
32-bit DSP Technology Takes You
Even Higher – To 144MHz !
Icom has taken the DSP technology recently introduced in the
IC-756PROII, and created a whole new radio category. The
IC-746PRO incorporates the 32-bit DSPfeatures to create some of
the most flexible signal enhancing, and interference reduction ever
offered in this type of radio. So follow along as we describe the latest features now available in the IC-746PRO.
50–500Hz 600–3600Hz
SSB
10 types; 50Hz step
CW
10 types; 50Hz step
Passband width range
31 types; 100Hz step
Mode
455kHz
36kHz
3Lo
Manual
NOTCHIFFilter
DET
AGC
AGC
DSP
D/A
D/AA/D AF
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