Yaesu FT-840
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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.Download brochure (PDF) |
Specifications:
GENERAL
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Receiving Frequency Range:
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100 kHz ~ 30 MHz |
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Transmitting Frequency Range:
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160 ~ 10 meter Amateur Bands |
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Frequency Stability:
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a10 ppm (or a500 Hz), |
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0
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from 0 ~ +40°C and a2 ppm (or a300 Hz FM*), |
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0
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from 0 ~ +50°C (with TCXO-4 option) |
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Emission Modes:
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USB, LSB(J3E), CW (A1A), AM (A3E), FM* (F3E) |
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Frequency Tuning Steps:
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10 Hz/100Hz (CW, SSB) |
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0
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100Hz/1kHz (AM, FM*) |
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Antenna Impedance:
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50 Ohm nominal |
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Operating Temp. Range:
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-10°C ~+50°C |
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Supply Voltage:
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13.5 VDC a10%, Negative Ground |
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Power Consumption:
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1.2 A RX (no signal) |
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0
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20 A TX (100 watts) |
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Dimensions (WHD):
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9.4 x 3.7 x 9.6 inches (238 x 93 x 243 mm) |
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Weight Approx.:
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9.9 Lbs. (4.5 kg) |
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0
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TRANSMITTER
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Power Output:
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Adjustable to 100 Watts (25 Watts AM carrier) |
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Modulation Types: SSB:
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Balanced, filtered carrier |
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AM:
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Low-level (early stage) |
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FM:
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Variable Reactance |
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Maximum FM Deviation:
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a2.5 kHz |
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Harmonic Radiation:
| > 50dB below peak output |
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0
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45 dB (10, 18 MHz) |
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Spurious Radiation:
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>40 dB below peak output |
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SSB Carrier Suppression:
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>40 dB below peak output |
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Undesired Sideband Suppression:
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At least 50 dB below peak output at 1.5 kHz modulation |
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Audio Response (SSB):
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not more than -6 dB from 400~2600 Hz |
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3rd order IMD:
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-25 dB @ 100 watts PEP, 14.2 MHz |
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Microphone Impedance:
| to 600 Ohm |
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0
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RECEIVER
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Circuit Type:
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dual-conversion superheterodyne |
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Intermediate Frequencies: 1st:
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47.055 MHz |
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2nd:
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8.215 MHz |
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3rd:
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455 kHz (FM* with option) |
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Sensitivity:
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(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: | |
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1.8 ~ 30 MHz (CW, SSB, AM):
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< 2.0 uV |
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28 ~ 30 MHz (FM*):
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< 0.32 uV |
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Image Rejection (1.8 ~ 30 MHz):
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70 dB or better |
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IF Rejection (1.8 ~ 30 MHz):
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60 dB or better |
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IF Shift range:
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a1.2 kHz |
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Clarifier Tuning Range / Steps:
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a1.25 kHz / 20 Hz |
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0
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a2.50 kHz / 10 Hz |
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Maximum Audio Power Output:
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At least 1.5W into 4 Ohm < 10% THD |
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Audio Output Impedance:
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4 to 8 Ohm |
