Icom's new superior class HF transceiver the IC-775DSP is designed
as a successor to the IC765.
The IC775DSP offers high quality receive and transmit audio for serous
DX'ers.
In addition, a non-DSP type, the IC775, is also available.
DSP (Digital Signal Processing; DSP-type only)
DSP digitally transposes transmit and receive audio signals to
produce desired AF frequenca characteristics and in addition
performs the following functions:
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Noise reduction - DSP converts all analog audio components to digital
components, then seperates them into voice and noise at the digital
stage. In this way, voice components can be singeld out and demodulated
back to analog signals so that weak signals that would normally be
drowned out by noise are audible. The reduction level can be adjusted
to obtain the most desired audio characteristics.
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PSN modulation - PSN method (Phase Shift Network) generates SSB signals
directly without DSB signals or SSB filters. Therefore even audio
characteristics, over the entire range from low to high audio components,
can be obtained, as well as high quality audio without filter group delays.
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Automatic notch filter - automatically suppresses the highest level
beat signals in the audio frequency.
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Twin PBT - One of the more highly praised funtions of the IC-781 -
twin PBT narrows the IF-passband in two stages to efficiently eliminate
interfering signals. This function is especially useful during crowded
band conditions such as pileups, contests, or for nets, etc.
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IF Notch - The IC-775's notch filter funtions at the IF stage, therefore,
sharp and deep filter characteristics are obtained as with the IC-781.
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Automatic Notch (DSP-type only) - An automatic frequency adjusting notch
filter ia available at the AF stage seperate from the IF notch. This
automatic notch reduces the maximum beat level with no manual adjustment
necessary.
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APF (Audio Peak Filter) - Allows a particular frequency to pass through
at the AF stages. This function is convenient for CW operation.
In addition, CW pitch is also related changed with APF.
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Dual Watch Funtions
Dual watch monitors 2 frequencies on the same band simultaneously.
Ideal for contests, traffic handling, DX chasing and net control work.
To operate the dual watch, the IC-775 has two PLLs, two RF circuits
and a balance control to balance signal strenght.
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Twin Tunning Knobs
For convenient dual watch operation, the transceiver has two tuning knobs.
The large main knob has good tension and response; the small, independent
sub small knob can be used to watch a sub frequency.
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Newly designed PLL
A new design is employed in the PLL circuit using ICOM's DDS technology
and removing mixer circuits, resulting in higher quality C/N
characteristics and superior spurious rejection.
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Power MOS FET's for clean signal.
Superior 3rd, 5th, 7th IMD characteristics are oblaimed by power
MOS FET's with high voltage. The IC-775 employs power MOS FETs
in the pre-driver, driver and final amplifier stages, providing
a clean 200 W of output over all bands.
GREAT FUNTIONS FOR CW OPERATIONS
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Memory Keyer - This funtion is convenient for contest, etc.
an often-used word or phrase can be programmed, such as a callsign,
"CQCQ", etc
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Electronic Keyer - Newly designed electronic keyer. Weight control
can be adjusted using set mode.
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CW Pitch Control - Adjusts the audio pitch of any CW signal without
changing the operation frequency.
-
CW Reverse - CW carrier point can be selected on USB and LSB bandwidth
while receiving CW to reduce interference.
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Two key jacks - The transceiver has a total of two key jacks on the
front and rear panels. The front panel key jack accepts a paddle and
a straight key (selectable using set mode) and the rear panel jack
accepts a straight key or an external memory keyer.
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Full break-in (QSK) capability
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Variety of filters selectable
3 selectable filters are available to achieve a desired bandwidth:
Mode Wide Middle Narrow
CW 2,4kHz 500Hz 250Hz (option)
SSB 6,0kHz 2,4kHz 1,8kHz (optional)
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OTHER FEATURES
1 crystal control for high frequency stability
Large heatsink and cooling fan
Selectable tone/shift frequency from set mode for instant data
(AFSK) operation.
2 selectable preamplifier gain (18-28MHz only)
CFL (Cold cathode Fluoresecent Lamp) back light for large LCD display.
Two anenna connectors with automatic selector.
High speed automatic antenna tuner.
Level/width variable noise blanker.
Gain selectable preamplifier (2 positions)
SWR/Po/ALC/COMP/Id/Vd selectable large analog meter
Improved quick split funtion
Convenient memo pad function
VOX function
Transmit signal monitor
Double band stacking register
Built-in heavy duty power supply
RF speech compressor
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