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.
Updated | Complete | UK - NORTHERN IRELAND
378 pages | 300+ Airports and Airfields
Voice com. | ACC | FIC | VOLMET | ACARS | VDL | ILS | VOR | DME
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 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 (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 328.00 (450USD) |
2021-aug |
Second Hand Excellent condition |
GBP 429.00 (500EUR) |
2021-aug |
Second Hand With Yaesu FC-10 automatic antenna tuner. FM unit installed |
GBP 369.00 | 2020-oct |
Second Hand Good condition, with microphone and power lead |
GBP 293.00 (330EUR) |
2019-dec |
Second Hand Good condition overall and working. Comes with hand mic and DC cable |
GBP 290.00 (369USD) |
2019-apr |
Second Hand Has the YF-112C CW filter installed. Comes with box, original owner's manual and MH-31B8 microphone |
GBP 340.00 (479USD) |
2006-may |
Second Hand Comes with owner's manual, MH-31B8 hand mic, and box |
FT-840 review
SQ6GTQ | 5 September 2024 |
I have many DX from this radio [FT-840 Yaesu], its advantage is the reception of very weak stations with city interference on S9.
[End post]
IZ1GRH | 5 June 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.
[End post]
Martin Jacinto | 17 March 2023 |
Very good radio, in my work we had this rig.
[End post]
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