RigPix logo

Yaesu logo


Back to main

Back to Yaesu

Next HF and more


Copyright logo


Last modified 2016-11-13

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
Mode:AM/SSB/CW (FM option)
Channels/memory management:90 regular
10 split/PMS
Lithium battery backup
Repeater shift/offset:0-500 KHz
Power supply:13.5 VDC 10%
Current drain/power consumption:RX: 1.2-1.4 A
TX: Max 20 A
Antenna impedance/connector:50 ohms / SO-239
Dimensions (W*H*D):238*93*243 mm (9.37*3.66*9.57")
Weight:4.5 Kg (9.92 lbs)
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)
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)
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: 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 ohms
External speaker connector:3.5 mm, 4-8 ohms




TRANSMITTER SECTION
RF output power: AM: Max 25 W
SSB/CW: Max 100 W
Modulation system:AM: Low-level, early stage
FM: Variable reactance (with optional FM-747)
SSB: Balanced, filtered carrier
Max FM deviation:2.5 KHz
Spurious emissions:Less than -40 dB
Microphone impedance/connector:500-600 ohms / 8-pin




MISCELLANEOUS
Manufactured:Japan, 1993-199x (Discontinued)
Additional info:New price 1994 in Sweden: 10025:- SEK
Related documents: User manual (4.9 MB)
Service manual (7.9 MB)
Modifications:
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 linear power supply (117 VAC)
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