IC-7760
At the Tokyo Ham Fair, Icom presented the new KV+6m transceiver in the high-end category. Conceptually, the IC-7760 consists of a removable front panel and a body, which contains RF circuits. The connection is a regular LAN cable, which additionally enables connection within the LAN network, for example in the house.
IC-7760 receiving circuits
Independent receivers
The IC-7760 has independent MAIN/SUB receivers from antenna to speaker, so one part of the receiver does not affect the other, which allows simultaneous reception of two signals in different bands/modes with the same power. As with the IC-7851 receiver, dual spectroscope provides simultaneous display of MAIN and SUB bands, which allows the operator to see changing band conditions.
Direct sampling of the RF signal
The IC-7760 uses a direct RF signal sampling system, in which RF signals are directly converted to digital signals and the signals are processed using FPGA (Field Programmable Gate Array). This system prevents non-linear distortions, which arise in the mixer stages during analog signal processing. In addition, by using DSP units in both the RF section and the removable front panel, the IC-7760 can handle complex audio path switching due to various interface inputs and outputs while minimizing lag in a home LAN environment.
Preselector and input filters
DIGI-CELL (digital preselector) it is very effective at suppressing strong out-of-band signals, for example from radio stations or multi-multi operation. In regular models (for example IC-7850/51 or IC-7610) the DIGI-SEL circuit was located immediately behind the RF input (antenna), to avoid signal distortion by out-of-band interference. Even though he was preamplifier switched on, noise figure (receiver sensitivity) could not be improved, because DIGI-SEL had insertion losses due to its narrow bandwidth. V IC-7760, which is a direct sampling system, DIGI-SEL prevents overflow (OVF) caused by unwanted out-of-band signals, and not signal distortion, and the preamp uses an A/D converter, to take full advantage of its dynamic range. When the preamplifier in the IC-7760 is turned on, the preamplifier first amplifies the intended signal and then the DIGI-SEL filters out unwanted out-of-band signals. This makes it possible, for the preamplifier to work together with the DIGI-SEL function.
While the previous model covered the high frequency bands using nine BPFs (bandpass filter), The IC-7760 uses 11 BPF in high frequency bands. Z22O Z21A Zimbabwe, thanks to the use of sharp filters dedicated for each amateur band, the BPF effectively attenuates out-of-band interfering signals in the RF stage and prevents overflow on the A/D converter.
Transmitting circuits IC-7760
200W power amplifier
IC-7760 uses in the PA part 65 V LDMOS-FET 450 W combined with a large radiator and efficient cooling system to achieve performance 200 W at full operation. Continuous operation in FT8 mode is also possible. In addition, frequency modulation and conversion is performed through digital signal processing, The D/A converter directly transmits the broadcast frequency, thus achieving the cleanest C/N transfer. By using 450 W FET devices in power 200 W achieves PA excellent IMD characteristics.
Predistortion v IC-7760
The DPD function corrects non-linear distortion at the power amplifier by applying inverse distortion beforehand. Clean signal transmission is achieved while providing high output power 200 W. The DPD function also works on output 1 kW in combination with IC-PW2.
Antenna tuner
The IC-7760 model is the first in ours 200 W models have a relay-type mechanical antenna tuner. It provides faster tuning than the conventional variable capacitor type. Once tuned, the tuning information is automatically recalled the next time you select a frequency, which facilitates smooth band changes and multi-band operation.
Main and secondary touch screen IC-7760
The removable front panel of the IC-7760 has a main and secondary touch screen: 7-inch main display (800 × 480 pixels, WVGA) and one 2.4-inch secondary display (320 × 240 pixels). The main display shows information necessary for operation, including MAIN/SUB operating frequencies, settings/operation status of each function, as well as a spectroscope, S-meter and RTTY/PSK31/63 decoding messages.
Secondary display
Filter settings can be displayed on the 2.4-inch secondary display, various meters and band stacking register. The filter setting screen can display the IF filter passband width and the IF filter shape superimposed on the IF filter passband signal. This function displays visible images of double PBTs, manual band clipping effects. Better visibility of information increases operational efficiency and ensures smoother operation.
Dual spectroscope
The dual spectroscope provides excellent scanning speed, resolution and wide dynamic range 100 dB with combined FPGA processing, DSP and CPU for main and sub-bands. It can also monitor two different bands simultaneously, which is useful for monitoring conditions and during competitions. A dual range can be displayed in a left-to-right or top-to-bottom layout, depending on the situation and needs. In Continuous SCROLL mode, a wide bandwidth exceeding can be displayed on the range screen 1 MHz. The waterfall display shows changes in the frequency spectrum vertically, which allows the user to find a weak signal, which is difficult to detect with a spectroscope. Increases QSO chances without it, to miss weak DX stations.
Audio Scope
The Audio Scope screen displays the frequency components of the transmitted and received signal on the FFT scale and its waveform components on the oscilloscope. Audio Scope makes it easy to monitor signal characteristics, such as the microphone compressor level, filter width and crop filter. You can monitor the received CW keying waveforms on an oscilloscope.
Two speakers
The IC-7760 is also equipped with two speakers. By splitting the MAIN/SUB sound to the left, resp. of the right speaker will improve sound resolution during Dualwatch operation. You can set the MAIN/SUB sound to stereo or mono output from both speakers.
Automatic numbering in the contest
Automatic contest numbering is ideal for CW and RTTY contests. With each broadcast from the programmed memory, the serial number is automatically calculated from 001. The serial number can be set in several places, to ensure reliable copying of the competition number.
FT8 preset configuration
Since the IC-7300, the FT8 has been actively used around the world in everyday operation, as well as DXpeditions. The FT8 is easy to set up with a simple selection from memory [Preset] and all necessary items can be set at once. Mask, when returning to normal settings from FT8 just select the memory [Normal] for a smooth transition. In addition, it is possible to write up to 3 memory [Preset] to SSTV prefixes, as well as future new digital modes, which will be supported.
RC-28
By connecting the optional RC-28 via USB connection, you can conveniently control the IC-7760's SUB band tuning with your fingertips. The MAIN/SUB toggle buttons can be assigned to the F-1 and F-2 buttons on the RC-28, and the RC-28 can act as a master selector for both MAIN and SUB bands. This allows for quick response to DXpedition stations in split operation, as well as Dualwatch.
The combination of a touch screen and a multifunction knob offers easy access to various settings. After pressing the multi selector, menu items appear on the right side of the display next to the selector. Touch this menu, to select an item, and then turn the multi selector to adjust the level, which provides much faster access to various functions, such as RF power, microphone gain, DIGI-SEL and notch functions.
Saving data on an SD card
An SD card slot is available as a data storage interface. In addition to voice recordings of outgoing and incoming calls, RTTY/PSK decoding protocols can also be stored in the memory, captured images of the display, user settings and firmware updates. It is also possible to store voice memories sent in Phone modes and memories of messages sent in CW/RTTY/PSK modes. Additionally, when changing operators, the operator can easily load their preferred settings from memory for immediate operation.
RS-BA1 internal server for remote station
Whether from a remote part of your home QTH, or from a remote location somewhere in the world, software RS-BA1 version 2 allows you to control your IC-7760. You can use Dualwatch operation and dual spectral range with waterfall functions on your remote computer. The addition of an Ethernet connector eliminates the need for a computer.
DVI-D connector for external display IC-7760
The Icom IC-7760 has a DVI-D connector on the removable front panel for outputting digital signals to an external display. The main display can be mirrored on a large external display.
