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Last modified 2023-09-17

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Yaesu FT-840

A picture of Yaesu FT-840

SPECIFICATIONS

GENERAL
Type:Amateur HF transceiver
Frequency range: TX: 10-160 m + WARC
RX: 0.1-30 MHz
Tuning steps:10 / 100 Hz, 1 KHz
Frequency stability:±10 ppm @ 0 to 40°C (32 to 104°F)
±2 ppm with optional TCXO-4
Mode:AM / SSB / CW (FM option)
Channels / memory management: 90 regular
10 split/PMS
RAM storage with lithium battery backup
Repeater shift / offset:±0-500 KHz
Power supply:13.5 VDC ±10%
Current drain / power consumption:RX: Max 1.4 A
TX: Max 20 A
Antenna impedance / connector:50 ohm / SO-239
Dimensions (W*H*D):238*93*243 mm (9.37*3.66*9.57")
Weight:4.5 Kg (9.92 lb)
Other features:CTCSS/PL encoder. IF shift. NB. 12 dB attenuator. CAT control.




RECEIVER SECTION
Receiver system: Double conversion superheterodyne (AM/SSB/CW)
1st IF: 47.055 MHz
2nd IF: 8.215 MHz
Triple conversion superheterodyne (FM), optional
1st IF: 47.055 MHz
2nd IF: 8.215 MHz
3rd IF: 455 KHz
Sensitivity: AM (10 dB S+N/N, 6 KHz BW)
0.15-0.25 MHz: 40 uV
0.25-0.5 MHz: 16 uV
0.5-1.8 MHz: 8 uV
1.8-30 MHz: 1 uV
FM (12 dB SINAD, 8 KHz BW), optional
28-30 MHz: 0.5 uV
SSB/CW (10 dB S+N/N, 2.4 KHz BW)
0.15-0.25 MHz: 5 uV
0.25-0.5 MHz: 2 uV
0.5-1.8 MHz: 1 uV
1.8-30 MHz: 0.25 uV
Selectivity: AM wide:
6 KHz (-6 dB)
14 KHz (-60 dB), with optional YF-112A
AM narrow:
2.2 KHz (-6 dB)
5 KHz (-60 dB)
FM (Optional):
8 KHz (-6 dB)
19 KHz (-50 dB), with optional FM-747
SSB/CW:
2.2 KHz (-6 dB)
5 KHz (-60 dB)
CW narrow:
500 Hz (-6 dB)
1.8 KHz (-60 dB), with optional YF-112C
Image rejection:70 dB (above 1.8 MHz)
AF output power / speaker:1.5 W at 10% distortion / 4 ohm
External speaker connector:3.5 mm, 4-8 ohm




TRANSMITTER SECTION
RF output power:

Max pwr
AM:25 W
FM:100 W
SSB (PEP):100 W
CW:100 W
Modulation system: AM: Low-level, early stage
FM: Variable reactance (With optional FM-747)
SSB: Balanced, filtered carrier
Max FM deviation (Factory set):±2.5 KHz
Spurious emissions:Better than -40 dB
Microphone impedance / connector:500-600 ohm / 8-pin (Metal locking ring connector)
Microphone input level:? mV




MISCELLANEOUS
Manufactured:Japan, 1993-200x (Discontinued)
Additional info:New price 1994 in Sweden: SEK 10025:-
Related documents: User manual (4.9 MB)
Service manual (7.9 MB)
Modifications and fixes:
Reviews:73 Amateur Radio: January 1995, page 10
Options / Accessories:
DVS-2
FC-10
FC-800
FIF-232C
FM-747
FP-800
FP-1023
FP-1030A
LL-5
MD-200A8X
MH-31
MMB-20
SP-6
TCXO-4
YF-112A
YF-112C
YH-77STA
Digital voice recorder
Automatic antennna tuner
External remote automatic antenna tuner
CAT interface for RS-232C
FM option
Matching AC power supply. 13.8 VDC, 20 A
Switching power supply
Linear power supply
Phone patch unit
Ultra fidelity desktop microphone
Standard microphone
Mobile mounting bracket
External filtered speaker with dual inputs
High stability crystal unit (±2 ppm)
AM wide filter, 6 KHz
CW narrow filter, 500 Hz
Lightweight stereo headphones
A rear picture of Yaesu FT-840