IC-7851

ICOM
IC-7851

Specifications

Prices

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 : amateur-radio

IC-7851 specifications

General

Frequency coverage
Receive (Main)	0.0300 ~ 60.0000 MHz [1]
Receive (Sub)	0.0300 ~ 60.0000 MHz [1]
Transmit [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
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)
IF filter ultimate attenuation
100 dB [5]
RF preamplifiers
Preamp1	~12 dB
Preamp2	~20 dB
RF attenuator
3 / 6 / 9 / 12 / 15 / 18 / 21 dB
RMDR (Reciprocal Mixing Dynamic Range)
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)
Spurious and image rejection
> 70 dB (1.8~30 MHz)
Twin PBT (Passband Tuning)
25 Hz steps (SSB / CW / FSK / PSK) 100 Hz steps (AM)
Notch filter
Manual	70 dB
Automatic	Yes
NB (Noise Blanker)
Depth and time-width adjustable
DNR (Digital Noise Reduction)
Variable in 16 steps
RIT (Receiver Incremental Tuning)
± 9.999 KHz
AGC (Automatic Gain Control)
Off, fast, mid, slow
Frequency stability
± 0.05 ppm max with temperature from 0°C to +50°C after 5' warm-up
IF (Intermediate Frequency)
1°	64.455 MHz (Main receiver) 64.555 MHz (Sub receiver)
2°	36 KHz
IF 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)
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

Transmitter

Output power
SSB / CW / RTTY / PSK / FM	5 ~ 200 W
AM	5 ~ 50 W
137 KHz band	10 mW [4]
Spurious emission
Out-of-band	< -40 dB (1.8~30 MHz) < -60 dB (50 MHz)
Spurious except harmonics	< -50 dB (1.8~30 MHz) < -70 dB (50 MHz)
Harmonics	< -60 dB (1.8~30 MHz) < -70 dB (50 MHz)
Carrier suppression (SSB)
> 63 dB
Unwanted sideband suppression (SSB)
> 70 dB
Microphone
600Ω
XIT (Transmitter Incremental Tuning)
± 9.999 KHz
CW features
6~48 wpm keyer
Antenna tuner
Impedance range	16.7 - 150Ω (1.8~30 MHz) 20 - 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 18cm 1 Hz frequency resolution
Antenna
4 x SO239 50Ω
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 on 8Ω
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

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

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IC-7851 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 ICOM 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 ICOM IC7851 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.

IC-7851 IF filter selection :

CW - PSK - SSB-N Mode / Selectivity range -3dB (in steps of)
FIL 1	1.2 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~3.6 KHz (100 Hz)
FIL 2	0.5 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~3.6 KHz (100 Hz)
FIL 3	0.25 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~3.6 KHz (100 Hz)
FSK - RTTY Mode / Selectivity range -3dB (in steps of)
FIL 1	2.4 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~2.7 KHz (100 Hz)
FIL 2	0.5 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~2.7 KHz (100 Hz)
FIL 3	0.25 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~2.7 KHz (100 Hz)
SSB Mode / Selectivity range -3dB (in steps of)
FIL 1	3.0 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~3.6 KHz (100 Hz)
FIL 2	2.4 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~3.6 KHz (100 Hz)
FIL 3	1.8 kHz Default 0.05~0.5 KHz (50 Hz) 0.6~3.6 KHz (100 Hz)
AM Mode / Selectivity range -3dB (in steps of)
FIL 1	9.0 kHz Default 0.2~10 kHz (200 Hz)
FIL 2	6.0 kHz Default 0.2~10 kHz (200 Hz)
FIL 3	3.0 kHz Default 0.2~10 kHz (200 Hz)
FM Mode / Selectivity -3dB
FIL 1	15.0 kHz Fixed
FIL 2	10.0 kHz Fixed
FIL 3	7.0 kHz Fixed

IC-7851 AGC time constant :

SSB Mode / Time constant
FAST	0.3s Default 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 seconds
MID	2.0s Default 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 seconds
SLOW	6.0s Default 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 seconds
CW Mode / Time constant
FAST	0.1s Default 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 seconds
MID	0.5s Default 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 seconds
SLOW	1.2s Default 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 seconds
FSK - PSK Mode / Time constant
FAST	0.1s Default 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 seconds
MID	0.5s Default 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 seconds
SLOW	1.2s Default 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 seconds
AM Mode / Time constant
FAST	3.0s Default 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 seconds
MID	5.0s Default 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 seconds
SLOW	7.0s Default 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 seconds
FM Mode / Time constant
FAST	0.1s Fixed

IC-7851 rear panel and connections :

IC-7851 accessories and options :

Part # / 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

IC-7851 price

We have collected for your convenience the ICOM IC-7851 sale price (UK Pounds) and its trend over time. Useful to guarantee a cheaper purchase of this radio and to put it for sale in the second-hand market. Of course offers, accessories, warranty terms and conditions can lead to different figures.

Price	Date	Condition
GBP 10440.00 (12160EUR)	2021-oct	Brand-new
GBP 9999.00	2018-oct	Brand-new

IC-7851 review

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