FT-840

Yaesu
FT-840

Specifications

Prices

Compact transceiver with up to 100 Watts output power on all HF amateur radio bands in CW, SSB and FM modes, and up to 25 Watts in AM. Dual/triple conversion 100 kHz to 30 MHz receiver with IF-shift, reverse CW, noise blanker, attenuator, dual VFOs. 100 memories, flexible scanning features, TX speech processor, two DDS synthesizers, tuning knob torque adjustment. Ideated in Japan, year of introduction 1993.

Reference market : amateur-radio

FT-840 specifications

General

Frequency coverage
Receive	0.1000 ~ 30.0000 MHz
Transmit	1.8000 ~ 2.0000 MHz 3.5000 ~ 4.0000 MHz 7.0000 ~ 7.5000 MHz 10.0000 ~ 10.5000 MHz 14.0000 ~ 14.5000 MHz 18.0000 ~ 18.5000 MHz 21.0000 ~ 21.5000 MHz 24.5000 ~ 25.0000 MHz 28.0000 ~ 29.7000 MHz
Mode
CW / LSB / USB / AM / FM [1]
Tuning step
10 / 100 Hz / 1 kHz 100 kHz / 1 MHz (down/up steps)

Receiver

Sensitivity
CW / SSB	<5.0 uV (0.15~0.25 MHz, 10dB S/N) <2.0 uV (0.25~0.5 MHz, 10dB S/N) <1.0 uV (0.5~1.8 MHz, 10dB S/N) <0.25 uV (1.8~30 MHz, 10dB S/N)
AM	<40 uV (0.15~0.25 MHz, 10dB S/N) <16 uV (0.25~0.5 MHz, 10dB S/N) <8 uV (0.5~1.8 MHz, 10dB S/N) <1 uV (1.8~30 MHz, 10dB S/N)
FM	<0.5 uV (1.8~30 MHz, 12dB SINAD)
Selectivity
CW-N [2]	0.5 KHz (-6dB) 1.8 KHz (-60dB)
CW / SSB	2.2 KHz (-6dB) 5.0 KHz (-60dB)
AM-N	2.2 KHz (-6dB) 5.0 KHz (-60dB)
AM-W [3]	6 KHz (-6dB) 14 KHz (-50dB)
FM	8 KHz (-6dB) 19 KHz (-60dB)
RF attenuator
12dB
Image rejection
> 70dB (1.8~30 MHz)
IF rejection
> 60dB (1.8~30 MHz)
IF-shift range
± 1.2 kHz
NB (Noise Blanker)
Yes
RIT (Receiver Incremental Tuning)
± 1.25 kHz (20Hz steps) ± 2.50 kHz (10Hz steps)
AGC (Automatic Gain Control)
Fast, slow
Frequency stability
± 10ppm with temperature from 0°C to +40°C (CW/SSB/AM). ± 500Hz with temperature from 0°C to +40°C (FM). ± 2ppm with temperature from 0°C to +50°C (CW/SSB/AM) [4]. ± 300Hz with temperature from 0°C to +50°C (FM) [4].
IF (Intermediate Frequency)
1°	47.055 MHz
2°	8.215 MHz
3°	455 KHz (FM only)
Squelch sensitivity
CW / SSB / AM	< 2uV (1.8~30 MHz)
FM	< 0.32uV (28~30 MHz)
CW features
Semi break-in 400~1000Hz adjustable BFO Reverse sideband

Transmitter

Output power
CW / SSB / FM	15 ~ 100 W
AM	15 ~ 25 W
Spurious emission
Harmonics	< -50dBc (1.8/3.5/7/14/ 21/24/28 MHz) < -45dBc (10/18 MHz)
Non-harmonics	< -40dBc
Carrier suppression (SSB)
> 40dB
Unwanted sideband suppression (SSB)
> 50dB (1500 Hz tone)
Intermodulation products (SSB)
-25dB (14.2 MHz, 100 W PEP)
Maximum deviation (FM)
± 2.5 kHz
Audio response
400~2600 Hz (-6dB)
Microphone
500~600Ω

Features

Memory
90 regular memories, 9 groups [5]. 10 pairs for programmable scan. 2 VFO for each band.
Display
10 Hz frequency resolution
Antenna
SO239 50Ω
Power supply
13.5 VDC (±10%)
Power consumption
1.2A RX, no signal 20A TX, 100W output
Audio power
1.5 W on 4Ω
Audio output
Jack 6.35 mm (headphone)
Connections
Jack 3.5 mm (4~8Ω external speaker) Jack 6.35 mm (CW key) RCA (ALC) RCA (PTT) RCA (AF output, 100mVp @ 600Ω) RCA (+13.5V / 200mA max / center positive) 5-pin mini DIN (FC-800 antenna tuner) 6-pin mini DIN (CAT) 8-pin mini DIN (FC-10 antenna tuner) 8-pin mini DIN (band data) 8-pin jack (microphone)

Mechanical and environmental data

Operating temperature
from -10°C to +50°C
Dimensions
238 (W) x 93 (H) x 243 (D) mm
Weight
4.5 kg

FM operation requires installation of the optional FM Unit-747.
With optional YF-112C 8-pole crystal filter.
With optional YF-112A filter.
With optional TCXO-4 unit.
Each memories store a pair of frequencies and modes, just as VFO-A and VFO-B.

FT-840 optional filter and FM unit :

The 500Hz YF-112C and 6 kHz YF-112A crystal filters may be installed for improved CW and AM receiver selectivity. The filter units have diodes installed which indicate their installation and enable selection from the front-panel. Installation of the FM Unit-747 permits narrow-band reception and transmission.

Yaesu FT-840 filter and FM unit installation

Yaesu FT-840 optional filter and FM unit installation

First, remove the top cover and disconnect the Speaker cable plug from its connector leading to the transceiver. Referring to the photo, determine the correct location of the unit(s) you are installing. Filters and the FM-Unit are installed by plugging them into position as labeled on the circuit board and shown in the photo. Re-connect the speaker cable and replace the top cover.

FT-840 price

We have collected for your convenience the Yaesu FT840 sale price (US Dollar) 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
USD 450.00	2021-aug	Second Hand Excellent condition
USD 588.00 (500EUR)	2021-aug	Second Hand With Yaesu FC-10 automatic antenna tuner. FM unit installed
USD 479.00 (369GBP)	2020-oct	Second Hand Good condition, with microphone and power lead
USD 374.00 (330EUR)	2019-dec	Second Hand Good condition overall and working. Comes with hand mic and DC cable
USD 369.95	2019-apr	Second Hand Has the YF-112C CW filter installed. Comes with box, original owner's manual and MH-31B8 microphone
USD 479.95	2006-may	Second Hand Comes with owner's manual, MH-31B8 hand mic, and box

FT-840 review

IZ1GRH

June-5 2023

Excellent RTX, even if it is an entry-level model it offers excellent performance, the receiver with double DDS is very silent and the audio transmission is very good. In transmission it delivers more than 100W.

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Martin Jacinto

March-17 2023

Very good radio, in my work we had this rig.

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