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Blending the high performance digital frequency synthesis techniques from the Yaesu FT-890 with the operating convenience and affordability of the Yaesu FT-747GX, the Yaesu FT-840 (FT840, Ft 840) adds a choice of two optional remote automatic antenna tuners and a wealth of convenient functions. For compact base and mobile stations, the FT-840 set the new standard for high-performance affordable transceivers. As a first-time rig, back-up or main station transceiver, the Yaesu FT-840 (FT840, FT 840) has the features and dependability that both beginners and seasoned operators will appreciate.

ft840-dds.jpg (18470 bytes)Two direct digital synthesisers (DDSS) and a magnetic rotary encoder provide silent, silky-smooth tuning, pure local signals and very fast transmit/receive switching. Frequency accuracy and stability are assured by driving both DDSs from a single master oscillator, and the optional TCXO-4 temperature-compensated crystal oscillator is available for enhanced 2-ppm stability from -10 to +50C. 
A choice of two automatic antenna tuners is available for the Yaesu FT-840 (FT840, FT 840) , each with its own microprocessor and memories which automatically store most recent antenna matching settings for nearly instant recall while changing operating frequency. The matching FC-10 can be mounted right next to the transceiver, or the FC-800 can be installed remotely at the antenna feed point. Each antenna tuner is controlled from the Yaesu FT-840 (FT840, FT 840) front panel.
The digitally synthesised local signals ensure clean, low-noise transmitter output: up to 100 watts on all HF amateur radio bands in CW, SSB and FM* modes, and up to 25 watts carrier in AM mode. 

*FM operation requires optional unit. 

The receiver tunes all frequencies between 100 kHz and 30 MHz in 10-Hz steps. For clear weak-signal work, the low-noise, high-performance receiver front-end feeds an active FET balanced mixer. A 12-dB attenuator can be inserted in the receiver front end for clear copy of even very strong signals. 
ft840-fc-20.jpg (10189 bytes)Both the FC-10 and FC-800 provide all-band transmitting capability with an end-fed random wire or long whip antenna (the FC-1 0 antenna tuner should be used with antennas requiring coaxial feed line, such as beams). Both tuners make use of the control circuitry built into the Yaesu FT-840 (FT840, FT 840) , which allows the operator to control and monitor automatic operation of the FC-10 or FC-800 mounted near the antenna feed point. The FC-10 provides a compact, easy-to-install unit that is styled to match the appearance of the Yaesu FT-840 (FT840, FT 840). For more demanding applications, the FC-800 uses specially selected thermally stable components and is housed in a waterproof casing to reliably withstand severe climatic extremes. 

ft840-fc-800.jpg (12902 bytes)Both the FC-10 and FC-800 match a wide variety of antennas to within a 1.5:1 SWR on any amateur band frequency in typically less than 30 seconds. Transmitter power required for matching can be as little as 10 watts, and matching settings are automatically stored in memory for instant recall when the same frequency range is reselected later. 

Yaesu FT-840 (FT840, FT 840) 16-BIT MAIN CPU
The 16-bit main microprocessor is assisted by four co-processors to provide the simplest possible control interface for the operator. Two independent (A/B) VFOs for each band (20 total) hold their own frequencies and modes, as well as clarifier offsets and repeater shifts, when used. One hundred memories store all of this data for both VFOs, giving a total of 220 independent sets of frequency, mode and other selections. Of course all memories can be freely tuned and scanned, but ten special memories also let you limit the tuning/scanning range between their stored frequencies. External PC control of most functions by a serial-port-equipped external personal computer is made possible using the FIF-232C CAT Interface option connected to the CAT jack on the rear panel.
ft840-pa.jpg (14042 bytes)The Yaesu FT-840 (FT840, FT 840) uses a modular die-cast RF power amplifier/heat sink with an internal thermally switched fan to allow full transmitter output without any rear panel protrusions to block access to connectors and controls. Modular circuit design employs surface-mount components on composite epoxy boards for high efficiency, reliability and serviceability. The Yaesu FT-840 (FT840, FT 840) weighs under 5 kg, and runs cool all the time. 
Interference rejection is facilitated by the unique "up-down-up' conversion scheme, and also provides an adjustable IF shift control to vary the receiver pass-band. Special features for CW include the reverse CW sideband feature, which prevents having to re-tune lost signals when switching between LSB and CW modes, and helps side-step adjacent interference. The adjustable CW pitch (400-Hz-1000-Hz) lets you match that used by your TNC or multi-mode controller. The optional YF-112C 500-Hz narrow IF crystal filter can be installed for enhanced CW narrow skirt selectivity, or the optional YF-112A AM-wide crystal filter is available for the best reception of shortwave broadcasts. Other valuable features include an effective noise blanker, all-mode squelch and multi-function front-panel meter. 
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Yaesu FT-840 (FT840, FT 840) OPTIONS

FP-800 AC Power Supply with Loudspeaker 

MD-1c8 Desktop Microphone with UP/DOWN/FAST Tuning Buttons

TCXO-4 Master Reference Oscillator
For special applications and environments where extra frequency stability is essential, the TCXO-4temperature-compensated crystal oscillator is a 2-ppm (from -10 to +50,C) replacement for the reference oscillator. 

SP-6 Loudspeaker with Audio Filters and LL-5 Phone Patch Option 
Selectable audio high- and lowpass filters with a large loudspeaker complement the audio characteristics of the Yaesu FT-840 (FT840, FT 840) with your choice of 12 different audio filtering combinations. Two input terminals are provided for multiple transceivers, with a front panel switch to select between them. A phone jack is provided on the front panel to take advantage of the audio filters with headphones. With the optional LL-5 Phone Patch Unit installed in the SP-6, the Yaesu FT-840 (FT840, FT 840) can be patched to the public telephone network. The LL-5 includes a hybrid transformer circuit to assure proper impedance matches, and gain controls and level meter to set proper audio levels on the telephone line. (VOX control not available). 

YH-77ST Lightweight Headphones
Dual samarium-cobalt transducers with sensitivity of 103 dB/mw (2 dB @ 1 kHz, 35Q) provide the perfect match for the Yaesu FT-840 (FT840, FT 840), taking full advantage of the spectacular audio performance. 

FIF232C CAT System Interface 
To control the Yaesu FT-840 (FT840, FT 840) from an RS-232C serial port of an external personal computer, use the FIF-232C to convert the TTL levels required by the trans- ceiver to the RS-232C levels required by the serial port. A cable is included for connection between the transceiver and the FIF-232C (the cable to the computer must be provided separately). The FIF-232C includes its own AC power supply. 

IF Crystal Filter Options 
For extra CW receiver selectivity, install the 500-Hz YF-112C. Also, for enhanced AM-wide receiver fidelity, the YF-112A 6-kHz crystal filter may be installed in addition to the standard 2.7 kHz filter (also used for SSB). 

FC-10 Matching External Antenna Tuner 
This compact antenna tuner requires only two plug-in cable connections to the Yaesu FT-840 (FT840, FT 840) , and allows convenient automatic antenna matching. The FC-10's size and appearance is styled to match the Yaesu FT-840 (FT840, FT 840) and is an attractive addition to your Yaesu station line-up. 

FC-800 External Remote Antenna Tuner 
For more demanding applications,the FC-800 is a weather-resistant automatic antenna matching unit that can be installed outdoors at the antenna feed-point, or at the antenna whip for mobile operation. 

FM Unit-747 
Installing this unit permits narrow-band FM reception and transmission, as used with 29.0-MHz Amateur 10-meter simplex and repeater operation. 

MMB-20 Mobile Mounting Bracket 

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Yaesu FT-840 (FT840, FT 840) SPECIFICATIONS

Yaesu FT-840 (FT840, FT 840) GENERAL
Frequency Ranges:RX:
100 kHz - 30 MHz
160-6 Meter Amateur Bands
Frequency Stability: Better than 10 ppm (or 5 Hz FM*),(0oC to +40oC) (SSB/CW/AM/AFSK)
from 0- +40oC and 2 ppm (or 300 Hz FM*), 
from 0- +50oC (w/TCXO-4 option)
Emission Modes: USB, LSB(J3E), CW (A1A), AM (A3E), FM* (F3E)
Synthesiser Steps (Min.): 0.1 Hz (CW/SSB), 10 Hz (AM/FM)
Antenna Impedance: 50 Ohm, Unbalanced
Operating Temp. Range: -10oC to +50oC (14oF to 122oF)
Power Requirements: DC 13.8V 10%, Negative Ground
Current Consumption (approx.): 1.2 A RX (no signal)
20 A TX (100 watts)
Dimensions (WHD): 238 x 93 x 243 mm
Weight Approx.:
4.5 kg
Yaesu FT-840 (FT840, FT 840) TRANSMITTER
RF Power Output:
Adjustable to 100 Watts 
25 Watts AM carrier
Modulation Types:   SSB:
Balanced, filtered carrier
AM: Early Stage (Low Level)
FM: Variable Reactance
FM Maximum Deviation: 2.5 kHz
Harmonic Radiation: >50 dB below peak output
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
SSB Frequency Response: 400 Hz - 2600 Hz (-6 dB)
3rd order IMD: -25 dB @ 100 watts PEP, 14.2 MHz
Microphone Impedance: 500 - 600 Ohm

Yaesu FT-840 (FT840, FT 840) RECEIVER
Circuit Type:
dual-conversion superheterodyne
Intermediate Frequencies: 1st:
47.055 MHz
2nd: 8.215 MHz
3rd: 455 kHz (FM*)
(for 10dB S/N, 0 dBu-1uV FM* 12 dB SINAD)

Frequency ->

Mode (BW)

150~250 kHz 250~500 kHz 0.5~1.8 MHz 1.8~30 MHz
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: 1.2 kHz
Clarifier Tuning Range / Steps: 1.25 kHz / 20 Hz
2.50 kHz / 10 Hz
Maximum Audio Power Output: At least 1.5W into 4 Ohm < 10% THD
Audio Output Impedance: 4 - 8 Ohm