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HAM Radios and Receivers HAM Radios and Receivers 2018–2019 European Edition RMDR (Reciprocal Mixing Dynamic Range) of 110 dB* (at 1 kHz) Completely Independent Dual Receivers Receive Two Bands Simultaneously High-Speed, High-Resolution Spectrum Waterfall Scope High Stability, High Spectral Purity Local Oscillator Full Duty 200 W Output Power 1.2 kHz Optimum Roofing Filter Greatly Improves In-band Adjacent Signal Performance Audio Scope and Oscilloscope for Observing Receive and Transmit Audio * At a 1 kHz offset frequency. Receive frequency: 14.2 MHz Mode: CW, IF BW: 500 Hz, Roo ng Filter: 1.2 kHz Experience in video http://www.icom.co.jp/r/ic-7851_me/ HF/50MHz TRANSCEIVER 1.2 kHz Optimum Roofing Filter Improved Phase Noise Characteristics Despite the trend to Phase noise is coherent in radio circuit design, |7851 switch to a down con- and the new LO design introduced in version or a hybrid the IC-7851 makes some major breakthroughs RMDR: 110 dB, Raising the Bar Again conversion receiver while utilizing the 64 MHz, up-conversion design, Icom believes receiver design introduced in the IC-7800. An Design advances developed by the Icom HF in the solid perfor- impressive 20 dB improvement is seen with the engineers for the Local Oscillator (LO) enable Optimum Roo ng Filter mance of the up-con- IC-7851’s 10 kHz measurement, and more than the IC-7851 to set a new benchmark for ama- version design. The 30 dB improvement at a 1 kHz measurement in teur radio receivers. The goal was to dramati- IC-7851 introduces a new 1.2 kHz Optimum comparison to the IC-7800. cally reduce the phase noise that degrades the Roo ng Filter, greatly improving the in-band target signal due to the sum of the entire signal Phase Noise Characteristics Comparisons adjacent signal performance. This newly devel- Receive Frequency: 14.2 MHz Mode: CW 1st LO frequency: 78.655 MHz present. The result was a RMDR of 110 dB*. -70 dBc/Hz -70 dBc/Hz oped lter overcomes the gap of a narrower -80 -80 Below is a comparison of the improvement -90 -90 roo ng lter in an up-conversion receiver. -100 -100 over the IC-7800. -110 -110 -120 -120 -130 -130 * At a 1 kHz offset frequency Innovative LO Design -140 -140 -150 -150 Receive frequency: 14.2 MHz Mode: CW, IF BW: 500 Hz -160 -160 Breaking the boundaries of traditional 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz Frequency Offset Frequency Offset Roo ng Filter IC-7800 = 3 kHz, IC-7851 = 1.2 kHz designs, the IC-7851 employs a Direct Digital IC-7851 IC-7800 RMDR Comparison Synthesizer (DDS) along with a Phase Locked Improved Spectrum Scope Oscillator for the LO (Local Oscillator). The RMDR(dB) Following the design linage of the IC-7800, 1kHz 2kHz 10kHz 20kHz C/N ratio excels beyond the IC-7800 and other the IC-7851 uses a dedicated DSP unit for the IC-7851 110 116 121 124 similar class HF transceivers. This design sig- Fast Fourier Transform (FFT) spectrum. The IC-7800 78 87 106 112 ni cantly reduces noise components in both receive and transmit signals. 2250 MFLOPS DSP processor enables a new dual scope function, signi cantly faster sweep RMDR LO C/N Characteristics Comparisons speeds, and better accuracy than in the IC-7800. Receive Frequency: 14.2 MHz Mode: CW 1st LO frequency: 78.655 MHz RMDR (Reciprocal Mixing Dynamic Range) SPAN = 20 kHz, RBW = 30 Hz, VBW = 10 Hz Scope Comparison is the relative level of an undesired signal, 0 0 -10 -10 IC-7851 IC-7800 offset “n” kHz from the RX passband, which -20 -20 Span Width 5 kHz–1000 kHz 5 kHz–500 kHz -30 -30 Resolution *1 1 pixel minimum *2 20 pixels minimum *4 will raise noise oor by 3 dB. The local -40 -40 29.3 frames/Sec *3 4 frames/Sec *3 -50 -50 Sweep Speed oscillator phase noise will mix with strong -60 -60 Display Dynamic Range 100 dB 80 dB -70 -70 Noise Floor Level –30 dBμ –19 dBμ unwanted signals and unavoidably generate -80 -80 *1 Number of dots shown at the 60 dB level, when receiving a signal. -90 -90 *2 SPAN = More than 20 kHz, SPEED = Slow noise which masks a wanted signal. -100 -100 *3 SPAN = Less than 20 kHz, SPEED = Fast *4 SPAN = 500 kHz, SPEED = Slow IC-7851 IC-7800 1 Base Station +40 dBm IP3 (3rd Order Intercept Point) Full Duty 200 W Output Power • Automatic antenna tuner • 50 MHz special The IC-7851 continues the +40 dBm, 3rd The push-pull power ampli ers using power preamp and mixer circuit • Digital manual notch order intercept point and 110 dB receiver MOS-FETs work on 48 V DC. They provide • Digital twin PBT eliminates interference from dynamic range benchmark set by the IC-7800. a powerful 200 W output power at full duty adjacent signals • New auto digital noise To achieve this superb receiver performance, cycle. An effective cooling system maintains blanker • ±0.05 ppm High Stability OCXO Unit the entire analogue circuitry and components internal temperatures within a safe range and [CW mode] • DSP-controlled CW keying have been re-engineered to match the DSP prevents thermal runaway. waveform shaping • Multi-function electronic units. A newly designed LO ampli er gener- keyer with adjustable keying speed, dot-dash ates high output while keeping at frequency Digital IF Filter ratio and paddle polarity • Audio Peak Filter characteristics over a 60 MHz wide range. Icom’s digital IF lters give you performance selection (soft/sharp) that is not possible with crystal or mechani- [Operation] • High-quality digital voice recorder Dual Spectrum Scope with cal lters. They allow the operator to adjust memory • Built-in RTTY, PSK31 and PSK63 with- Waterfall Function lter shape (sharp or soft), lter bandwidth, out needing a computer • Message memory for The IC-7851 introduces the new dual scope, and center frequency characteristics, without Voice, CW, RTTY and PSK31/63 • Digital video enabling you to observe both receivers in missing the action. interface (DVI-I) • SD memory card slot • Audio separate spectrum scopes. The dual scope Other Outstanding Features scope function • Mouse control spectrum scope function is vital to watch for multipliers or • AGC control • Microphone equalizer and [Antenna and receiver] • Two completely band openings in contests, or working all adjustable transmit bandwidth • FFT scope independent receivers • 15 kHz, 6 kHz, 3 kHz bands/modes on a DXpedition. The waterfall averaging function for PSK and RTTY decode and 1.2 kHz 1st IF Roofi ng fi lters • Four anten- display captures signal strengths over time. • Screen saver function This enables you to see signals that may not na connectors with automatic antenna selector be apparent on a normal scope. Dual scope example (Horizontally aligned) 2 RMDR (Reciprocal Mixing Dynamic Range) of 110 dB* (at 2 kHz) Independent Dual Receivers Receive Two Bands Simultaneously Superior Transmit Phase Noise Characteristics DIGI-SEL Preselector for Main and Sub Bands High-Speed, High-Resolution Real-time Spectrum Scope Touch Screen and Multi-Dial Knob for Smooth Operation DVI-D Digital Connector for External Display Connection * At a 2 kHz offset frequency. Receive frequency: 14.2 MHz Mode: CW, IF BW: 500 Hz HF/50MHz TRANSCEIVER Independent Dual Receivers Receive High-Speed, High-Resolution Two Bands Simultaneously Real-time Spectrum Scope |7610 The dual receivers are ideal for simultaneous The real-time spectrum scope of the IC-7610 monitoring of two bands and two modes. The shows main and sub band conditions. It pro- sub receiver works independently of the main vides class-leading performance in resolu- Innovative RF Direct Sampling System receiver. The optional RC-28 can be used as tion, sweep speed and a 100 dB of dynamic Achieves 110 dB* (typ) RMDR for main dial and/or the sub dial. range. The waterfall screen enables you to The RF direct sampling system directly con- nd weak signals by showing the spectrum verts the analogue signals to digital signals, Superior Transmit Phase Noise change over time. Connecting a PC mouse and collectively puts the data through FPGA Characteristics to the USB port aids in exible use of the (Field-Programmable Gate Array) processing. Breaking with the tradition of mixing a car- spectrum scope. The master clock uses a high precision VCXO rier signal with a local oscillator, a Digital- (Voltage Controlled Crystal Oscillator) which Up-Conversion (DUC) is used to generate FFT Scope and Oscilloscope excels in low-noise characteristics. This makes required frequencies by sampling in the for Audio Observation it possible to provide superior receive and Digital to Analogue Converter (DAC). The The audio scope function shows the FFT transmit performance, extremely low phase superior Phase Noise characteristics provide scope with waterfall and the oscilloscope of noise as well as high RMDR (Reciprocal Mixing high purity transmit signals. either transmit or receive audio. This function Dynamic Range). can be used to observe various AF character- DIGI-SEL Firmly Shuts Out * At 2 kHz frequency separation. istics such as microphone compressor level, Interfering Signals lter width, notch lter and receive keying RMDR Characteristics Both main and sub receivers are equipped waveform in CW mode. * Receive frequency: 14.2 MHz, MODE: CW, IF BW: 500 Hz with DIGI-SEL (digital preselector) units. The 130 DIGI-SEL has steeper skirt characteristics Touch Screen and Multi-Dial Knob 120 than normal band- for Smooth Operation 110 pass lters, so it The combination of the touch screen and 100 rejects out of band the multi-dial knob offers quick and smooth RMDR (dB) 90 strong interference, operation.
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