IC-7851 | ICOM

ICOM » IC-7851

Advanced HF+50 MHz transceiver. Double-conversion receiver with frequency range 0.03-60 MHz, digi-sel preselector, dual watch. Transmitter with 200 Watt max output power in 1.8-54 MHz ham-band, low power on 137 KHz band. Ideated in Japan, year of introduction 2015.

Reference market : ham-radio

General :
Frequency coverage RX
(Main receiver)
0.0300 ~ 60.0000 MHz [1]
RX
(Sub receiver)
0.0300 ~ 60.0000 MHz [1]
TX [2] 0.1357 ~ 0.1378
1.8000 ~ 1.9999
3.5000 ~ 3.9999
5.2550 ~ 5.4050
7.0000 ~ 7.3000
10.1000 ~ 10.1500
14.0000 ~ 14.3500
18.0680 ~ 18.1680
21.0000 ~ 21.4500
24.8900 ~ 24.9900
28.0000 ~ 29.7000
50.0000 ~ 54.0000
Modulation mode CW / FSK (RTTY) / PSK (PSK31/63) / LSB / USB / AM / FM
Tuning step 1 / 10 / 100 Hz / 1 / 5 / 9 / 10 / 12.5 / 20 / 25 KHz
Receiver :
Sensitivity SSB / CW / RTTY / PSK [3] 0.5 uV (0.1~1.8 MHz, 10dB S/N, preamp1 on)
0.16 uV (1.8~30 MHz, 10dB S/N, preamp1 on)
0.13 uV (50~54 MHz, 10dB S/N, preamp2 on)
SSB [4] 10 dBuV (1.8~3 MHz, 12dB SINAD, preamp1 on)
0 dBuV (3~30 MHz, 12dB SINAD, preamp1 on)
-6 dBuV (50~54 MHz, 12dB SINAD, preamp2 on)
AM [3] 6.3 uV (0.1~1.8 MHz, 10dB S/N, preamp1 on)
2.0 uV (1.8~30 MHz, 10dB S/N, preamp1 on)
1.0 uV (50~54 MHz, 10dB S/N, preamp2 on)
AM [4] 16 dBuV (1.8~3 MHz, 12dB SINAD, preamp1 on)
6 dBuV (3~30 MHz, 12dB SINAD, preamp1 on)
0 dBuV (3~30 MHz, 12dB SINAD, preamp2 on)
FM [3] 0.5 uV (28~29.7 MHz, 12dB SINAD, preamp1 on)
0.32 uV (50~54 MHz, 12dB SINAD, preamp2 on)
FM [4] 0 dBuV (28~29.7 MHz, 12dB SINAD, preamp1 on)
-6 dBuV (50~54 MHz, 12dB SINAD, preamp2 on)
Selectivity CW / RTTY / PSK > 0.5 KHz (-3dB)
< 0.7 KHz (-60dB)
SSB / RTTY > 2.4 KHz (-3dB)
< 3.6 KHz (-60dB)
AM > 6.0 KHz (-3dB)
< 15.0 KHz (-60dB)
FM > 12.0 KHz (-3dB)
< 20.0 KHz (-60dB)
RF preamplifier Preamp1 ~12 dB
Preamp2 ~20 dB
RF attenuator 3 / 6 / 9 / 12 / 15 / 18 / 21 dB
IF-filter ultimate attenuation 100 dB [5]
Reciprocal mixing dynamic range (RMDR) 110 dB (1 KHz spaced signals, 14 MHz, BW 500 Hz)
116 dB (2 KHz spaced signals, 14 MHz, BW 500 Hz)
121 dB (10 KHz spaced signals, 14 MHz, BW 500 Hz)
124 dB (20 KHz spaced signals, 14 MHz, BW 500 Hz)
Blocking 149 dB (100 KHz spaced signal, 14 MHz) [5]
IP3 (3rd order intercept point) +40 dBm (14 MHz)
Synthesizer phase noise -140 dBc @ 1 KHz (14 MHz)
-150 dBc @ 10 KHz (14 MHz)
Image and spurious rejection > 70 dB (1.8~30 MHz)
Twin PBT 25 Hz steps (SSB, CW, FSK, PSK)
100 Hz steps (AM)
Notch attenuation (Manual) 70 dB
Notch (Auto) Yes
CW features Semi break-in / full break-in
300~900 Hz pitch control in 5 Hz step
APF (Audio Peak Filter)
Reverse mode L/USB
Noise blanker (NB) Depth and time-width adjustable
Noise reduction (NR) Variable in 16 steps
RIT variable range ± 9.999 KHz
AGC Off, fast, mid, slow (Selectable)
Frequency stability ± 0.05 ppm max with temperature from 0°C to +50°C after 5' warm-up
Intermediate frequency 64.455 MHz (Main receiver)
64.555 MHz (Sub receiver)
36 KHz
1° Intermediate frequency roofing filter 1.2 / 3 / 6 / 15 KHz
Squelch sensitivity SSB / CW / RTTY 5.6 uV (CW / SSB / RTTY / PSK, preamp off)
1.0 uV (FM, preamp off)
Transmitter :
Output power SSB / CW / RTTY / PSK / FM 5 ~ 200 W
AM 5 ~ 50 W
137 KHz band 10 mW [4]
Spurious emission Harmonics < -60 dB (1.8~30 MHz)
< -70 dB (50 MHz)
Spurious except harmonics < -50 dB (1.8~30 MHz)
< -70 dB (50 MHz)
Out of band < -40 dB (1.8~30 MHz)
< -60 dB (50 MHz)
Carrier suppression (SSB) > 63 dB
Unwanted sideband suppression (SSB) > 70 dB
XIT variable range ± 9.999 KHz
Microphone 600Ω
CW features 6~48 wpm keyer
Antenna tuner Matching impedance range 16.7 to 150Ω (1.8~30 MHz)
20 to 125Ω (50 MHz)
Minimum operating power 8 W (1.8~30 MHz)
15 W (50 MHz)
Tuning accuracy SWR 1.5:1
Insertion loss < 1 dB
Features :
Memory 99 regular memories
2 for programmed scan limits
Display Size 18 cm diagonal
1 Hz frequency resolution
Antenna 4 x SO239 50Ω connectors
Power supply 85~265 VAC
Power consumption 15 VA in power OFF standby
150 VA RX, typ
800 VA TX, max power
Audio power 2.6 W with an 8Ω load
Audio output Jack 6.35 mm headphone
2 x Jack 3.5 mm external speakers (Main and Sub)
Connections DVI-I (external display)
USB (PC)
USB (remote, flash drive, keyboard)
Jack 8-pin (microphone)
S/P-DIF (audio input)
S/P-DIF (audio output)
LAN (ethernet)
4 x Socket 7-pin (accessories)
Jack (DC output)
RCA (ALC)
RCA (TX/RX control)
Jack 6.35 mm (key)
Jack 3.5 mm (keypad)
Jack 3.5 mm (S-meter output)
Jack 3.5 mm (CI-V remote control)
BNC (transverter)
2 x BNC (receive Antenna-A input/output)
2 x BNC (receive Antenna-B input/output)
BNC (10 MHz reference)
Mechanical and environmental data :
Operating temperature from -0°C to +50°C
Dimensions 425 (W) x 149 (H) x 435 (D) mm
Weight 23.5kg

[1] Some frequency ranges are not guaranteed
[2] Varies according to version
[3] All versions. 2400 Hz SSB bandwidth, 6.0 KHz AM bandwidth, 15.0 KHz FM bandwidth
[4] European versions. 2400 Hz SSB bandwidth, 4.0 KHz AM bandwidth, 7.0 KHz FM bandwidth
[5] This parameter, not in official data, was obtained with direct tests

Description :

Despite the trend to switch to a down conversion or a hybrid conversion receive design, ICOM believes in the solid performance 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 1.2 KHz 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. Breaking the boundaries of traditional designs, the IC-7851 employs a direct digital synthesizer (DDS) along with a PLL for the local oscillator. The C/N ratio excels beyond other similar class HF transceivers, this design significantly reduces noise components in both receive and transmit signals.

The IC-7851 introduces the new dual scope, the ability of watching both receivers in separate spectrum scopes. The dual scope function is vital for watching for multipliers or band openings in contests, or working all bands/modes on a DXpedition. The waterfall display captures signal strengths over time. This allows you to see signals that may not be apparent on a normal scope. Additionally, the combination of the scope attenuator and the wide screen mode gives you a better view of weaker signals as band conditions change. For the ultimate scope enhancement, the IC-7851 has a digital video interface (DVI-I) for a larger display.

Digi-sel preselector. Works between 1.5~30 MHz and rejects distortion components derived from out of band interference such as multi-multi operation or strong broadcast stations. It automatically tracks the intended signal keeping the preselector's bandwidth centered on the operating frequency. The center frequency of the preselector is manually adjustable from the Intercept Point DIGI-SEL tuning knob on the front panel.

IF filter selection :

Mode Default Adjustable range (steps)
CW / PSK / SSB-N FIL 1 1.2 kHz 0.05~0.5 KHz (50 Hz)
0.6~3.6 KHz (100 Hz)
FIL 2 0.5 kHz
FIL 3 0.25 kHz
FSK-RTTY FIL 1 2.4 kHz 0.05~0.5 KHz (50 Hz)
0.6~2.7 KHz (100 Hz)
FIL 2 0.5 kHz
FIL 3 0.25 kHz
SSB FIL 1 3.0 kHz 0.05~0.5 KHz (50 Hz)
0.6~3.6 KHz (100 Hz)
FIL 2 2.4 kHz
FIL 3 1.8 kHz
AM FIL 1 9.0 kHz 0.2~10 kHz (200 Hz)
FIL 2 6.0 kHz
FIL 3 3.0 kHz
FM FIL 1 15 kHz Fixed
FIL 2 10 kHz
FIL 3 7 kHz

AGC time constant :

Mode Default Selectable AGC time constant
SSB 0.3 FAST OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 second
2.0 MID
6.0 SLOW
CW 0.1 FAST OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 second
0.5 MID
1.2 SLOW
FSK / PSK 0.1 FAST OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 second
0.5 MID
1.2 SLOW
AM 3.0 FAST OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 second
5.0 MID
7.0 SLOW
FM 0.1 FAST 0.1 second fixed

Rear pannel and connections :

Accessories and options :

P/N Description
IC-PW1 / IC-PW1EURO Linear amplifier, 1 KW, HF + 50 MHz
SP-33 External speaker
SP-24 External speaker, with 4 audio filters
HM-36 Hand microphone
HM-30 Desktop microphone
HM-50 Desktop microphone, Includes UP / DOWN switches
CT-17 CI-V / RS-232C level converter
RC-28 Remote control dial
RS-BA1 IP remote control software

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