Design advances developed by the Icom HF engineers for the Local Oscillator (LO) enable the IC-7851 to set a new benchmark for amateur radio receivers. The goal was to dramatically reduce the phase noise that degrades the target signal due to the sum of the entire signal present. The result was a RMDR of 110dB. Below is a comparison of the improvement over the IC-7800.At a 1kHz offset frequencyReceiving frequency: 14.2 MHz Mode: CW, IF BW: 500 HzRoofing Filter IC-7800 = 3 kHz, IC-7851 = 1.2 kHz RMDR Comparison. Despite the trend to switch to a down conversion or a hybrid conversion receive design, Icom bel ieves in the sol id per formance of the up-conversion design. In an up-conversion receiver, suppression of image interference and reduce distortion from electric components is easily overcome. A flat consistent performance is delivered over a wider frequency range.The IC-7851 introduces a new 1.2kHz Optimum Roofing Filter, greatly improving the in-band adjacent signal performance.

This newly developed filter overcomes the gap of a narrower roofing filter in an up-conversion receiver. Optimum Roofing Filter Characteristic Diagram. The audio scope simultaneously shows an oscilloscope and FFT for receive and transmit audio. Adjust your transmit audio by watching your compressor level, equalization and mic gain settings to give you the audio you want for SSB. The oscilloscope shows the CW waveform.

The iCOM IC 7851. Says it all.-Earlier 5-star review posted by G7EMK on 2016-10-26 Having owned and worked the iCOM ic 7800 since early 2005 I feel well placed to comment on this outstanding transceiver. The radio has provided flawless communicational enjoyment for 11 years.

On receive, you can see the power of your filtering by watching filtering adjustments take out interfering signals including filter width and notch filter placement. The processing power in the IC-7851 allows for dual mini band scopes as well as the audio scope.

The IC-7851 has multiple AGC loops. The AGC voltages detected in front of and behind the digital IF filter in the DSP unit. The first AGC loop prevents saturation of the 1st IF amplifier.

The other AGC loop detects the AGC voltage at the digital IF filter output which has only passed the intended signal and draws the full potential from the digital IF filter. Combining the digital IF filter, manual notch, and the 1st IF stage, these are all controlled by the DSP unit. 110dB of ultra wide dynamic range in the receiver means the IF amplifier is distortion free from strong signals.

Dual AGC Loops. Simple receiver system configuration is the best way to eliminate sources of the spurious signals and distortion from transceivers.The IC-7851 uses a double conversion system composed of a D-MOS FET 1st mixer and image rejection mixer for the 2nd stage. The 1st mixer stage is driven with a signal from the highdrive Local Oscillator with excellent C/N.The image rejection mixer for the 2nd stage reduces signal distortion through IF processing and provides a high-fidelity signal to the DSP unit. This system provides wide dynamic range, reducing the distortion from strong signals and lower intermodulation. High Performance OCXO Unit. With the flexibility of DSP-based waveform shaping, transmit and receive audio quality is adjustable to suit your preference. Three user-adjustable transmit filters, Wide/Mid/Narrow, allow you to set both the low and high cut-off frequency limits.

(100, 200, 300, 500Hz for lower and 2500, 2700, 2800, 2900Hz for higher frequencies.) In addition to the TBW filter, the IC-7851 has an equalizer to digitally tweaks your transmit audio with separate bass and treble controls (11 steps each for bass and treble). The receive audio can be tailored with modespecific Bass/Treble or audio passband settings. Digital RF Speech Compressor. The IC-7851 has various computer interfaces, giving you maximum connectivity between your computer and radio. Digital modes become a snap when controlling with the USB port. USB audio and some CI-V commands including USB send (DTR/RTS) and USB keying (CW and RTTY) are selectable.

You can also interface your computer with the S/P DIF optical digital interface provides audio I/O.The Ethernet jack allows you to connect the IC-7851 directly to your router and control your radio over your wireless Internet, or travel the globe and operate your station remotely over the Internet. Firmware Update Capability.

DSP controlled CW keying waveform shaping. Multi-function electronic keyer with adjustable keying speed, dot/dash ratio, keyer type, rise time and paddle polarity. Electronic keyer speed popup.

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CW pitch control from 300 to 900Hz (5Hz pitch). CW reverse mode operation for receiving USB side signal.

Double key jacks for front and rear panels. Full break-in and semi break-in functions. CW/AM auto tuning function helps to zero in on intended signals within ±500Hz range. Soft and sharp audio filter shapes for the Audio Peak Filter (APF)Operation.

Frequency coverage.1U.S.A. VersionEurope VersionReceiver0.030–60.000MHz.20.030–60.000MHz.2Transmit1.800–1.999MHz3.500–3.999MHz5.255–5.405MHz.27.000–7.300MHz10.100–10.150MHz14.000–14.350MHz18.068–18.168MHz21.000–21.450MHz24.890–24.990MHz28.000–29.700MHz50.000–54.000MHz0.1357–0.1378MHz1.810–1.999MHz3.500–3.800MHz7.000–7.200MHz10.100–10.150MHz14.000–14.350MHz18.068–18.168MHz21.000–21.450MHz24.890–24.990MHz28.000–29.700MHz50.000–52.000MHz.1 Varies according to version.2 Some frequency bands are not guaranteed.ModeUSB, LSB, CW, RTTY, PSK31/63, AM, FMNo. Of memory channels101 (99 regular, 2 scan edges)Antenna connectorSO-239×4 and BNC×2 (50Ω unbalanced (Tuner off))Operating temp. Range0°C to +50°C; +32°F to +122°FFrequency stabilityLess than ±0.05ppm (0°C to +50°C @ 54MHz, after warm up)Frequency resolution1Hz (minimum)Power supply requirement85–265V ACCurrent drainTX: 800VA (Max. Power)RX: 130VA/120VA typ. Audio/standby)Dimensions (W×H×D,projections not included)425×149×435 mm; 16.73×5.87×17.13 inWeight (approximate)23.5 kg; 51.8 lbTransmitter.

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