Yaesu FT-840

Summary:

One of the last no-nonsense HF-tranceivers around and still for sale today. The FT-840 uses a die-cast RF power amp with thermally switched fan to ensure full power output (up to 100 watts). The digitally synthesized local signals ensure clean, low-noise transmitter output on all HF amateur bands. Other features include IF shift, reverse CW, dual VFOs, 100 memories, attenuator, noise blanker, meter, scan modes and speech processor.

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Specifications:

GENERAL
Receiving Frequency Range:
100 kHz ~ 30 MHz
Transmitting Frequency Range:
160 ~ 10 meter Amateur Bands
Frequency Stability:
a10 ppm (or a500 Hz),
0
from 0 ~ +40C and a2 ppm (or a300 Hz FM*),
0
from 0 ~ +50C (with TCXO-4 option)
Emission Modes:
USB, LSB(J3E), CW (A1A), AM (A3E), FM* (F3E)
Frequency Tuning Steps:
10 Hz/100Hz (CW, SSB)
0
100Hz/1kHz (AM, FM*)
Antenna Impedance:
50 Ohm nominal
Operating Temp. Range:
-10C ~+50C
Supply Voltage:
13.5 VDC a10%, Negative Ground
Power Consumption:
1.2 A RX (no signal)
0
20 A TX (100 watts)
Dimensions (WHD):
9.4 x 3.7 x 9.6 inches (238 x 93 x 243 mm)
Weight Approx.:
9.9 Lbs. (4.5 kg)
0
TRANSMITTER
Power Output:
Adjustable to 100 Watts (25 Watts AM carrier)
Modulation Types: SSB:
Balanced, filtered carrier
AM:
Low-level (early stage)
FM:
Variable Reactance
Maximum FM Deviation:
a2.5 kHz
Harmonic Radiation:
> 50dB below peak output
0
45 dB (10, 18 MHz)
Spurious Radiation:
>40 dB below peak output
SSB Carrier Suppression:
>40 dB below peak output
Undesired Sideband Suppression:
At least 50 dB below peak output at 1.5 kHz modulation
Audio Response (SSB):
not more than -6 dB from 400~2600 Hz
3rd order IMD:
-25 dB @ 100 watts PEP, 14.2 MHz
Microphone Impedance:
to 600 Ohm
0
RECEIVER
Circuit Type:
dual-conversion superheterodyne
Intermediate Frequencies: 1st:
47.055 MHz
2nd:
8.215 MHz
3rd:
455 kHz (FM* with option)
Sensitivity:
(for 10dB S/N, 0 dBu = 1uV FM* 12 dB SINAD)
Frequency -> 150~250 kHz 250~500 kHz 0.5~1.8 MHz 1.8~30 MHz
Mode (BW)
SSB, CW (2.4 kHz) < 5 uV < 2 uV < 1uV < 0.25 uV
AM (6 kHz) < 40 uV < 16 uV < 8 uV < 1 uV
FM*(28-30 MHz) (8 kHz) - - - < 0.5 uV
Selectivity: (-6/-60 dB) ripple 3 dB or better
Modes Minimum 6 dB BW Maximum 60 dB BW
CW narrow (optional) 500 Hz 1.8 kHz
SSB, CW, AM narrow 2.2 kHz 5.0 kHz
AM-Wide (optional) 6 kHz 14 kHz (-50 dB)
FM* (optional) 8 kHz 19 kHz
Squelch Sensitivity:
1.8 ~ 30 MHz (CW, SSB, AM):
< 2.0 uV
28 ~ 30 MHz (FM*):
< 0.32 uV
Image Rejection (1.8 ~ 30 MHz):
70 dB or better
IF Rejection (1.8 ~ 30 MHz):
60 dB or better
IF Shift range:
a1.2 kHz
Clarifier Tuning Range / Steps:
a1.25 kHz / 20 Hz
0
a2.50 kHz / 10 Hz
Maximum Audio Power Output:
At least 1.5W into 4 Ohm < 10% THD
Audio Output Impedance:
4 to 8 Ohm

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