YAESU FT-840 Compact High Performance HF Transceiver User Manual

FT-840
COMPACT HIGH PERFORMANCE
HF TRANSCEIVER
YAESU

FT-840 Compact High Performance HF Transceiver

Performance Forward
Blending the high performance digital frequency synthesis techniques from the FT-890 with the operating convenience and affordability of the FT-747GX, the 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 sets the new standard for high-performance affordable transceivers. As a first-time rig, back-up or main station transceiver, the FT-840 has the features and dependability that both beginners and seasoned operators will appreciate.

FT-840
COMPACT HIGH PERFORMANCE
HF TRANSCEIVER

Direct Digital Frequency Synthesis
Two direct digital synthesizers (DDSs) and a magnetic rotary encoder provide silent, silky-smooth tuning, pure local signals and very fast transmit/receive switching. Frequency accuracy and sta­ bility are assured by driving both DDSs from a single master oscillator, and the optional TCXO-4 temperature-compen­ sated crystal oscillator is available for en­ hanced ± 2-ppm stability from –10 to +50C.
Two Automatic Antenna Tuners A choice of two automatic antenna tun­ ers is available for the 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 FT-840 front panel.
Clean Transmitter Output
The digitally synthesized local signals ensure clean, low-noise transmitter output: up to 100 watts on all HF ama­ teur radio bands in CW, SSB and FM’ modes, and up to 25 watts carrier in AM mode.
• FM operation requires optional unit.
Wide Receiver Dynamic Range The receiver tunes all frequencies be­ tween 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 in­ serted in the receiver front-end for clear copy of even very strong signals.

YAESU,Choice of the World’s Top DX’er
16-Bit Main CPU
The 16-bit main microprocessor is as­ sisted by four co-processors to provide the simplest possible control interface for the operator. Two independent (NB) 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, giv­ ing 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.
Quality Construction
The FT-840 uses a modular die-cast RF power amplifier/heat sink with an inter-

nal thermally switched fan to allow full transmitter output without any rear panel protrusions to block access to connec­ tors and controls. Modular circuit design employs surface-mount components on composite epoxy boards for high effi­ ciency, reliability and serviceability. The FT-840 weighs under 5 kg, and runs cool all the time.
IF Shift, Reverse CW Sideband &Extras
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 con­ troller. The optional YF-112C 500-Hz nar­ row IF crystal filter can be installed for enhanced CW-narrow skirt selectivity, or the optional YF-112A AM-wide crys­ tal filter is available for the best recep­ tion of shortwave broadcasts. Other valuable features include an effective noise blanker, all- mode squelch and multi-function front-panel meter.

FC-10 & FC-800 Remote Automatic Antenna Tuner Options
Both the FC-10 and FC-800 provide all- band transmitting capability with an end- fed random wire or long whip antenna (the FC-10 antenna tuner should be used with  ntennas requiring coaxial feed line, such as beams). Both tuners make use of the control circuitry built into the FT-840, which allows the operator to con­ trol 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 FT-840. For more demanding applica­ tions, the FC-800 uses specially selected thermally stable components and is housed in a waterproof casing to relia­ bly withstand severe climatic extremes. 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 typi­ cally 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.

OPTIONS

FP-800 AC Power Supply with Loudspeaker
MD-1cs 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-4 temperature-compensated crystal oscillator is a 2-ppm (from -10 to +50C) 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 comple­ ment the audio characteristics of the 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  P-6, the 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 avaialble).
YH-77ST Lightweight Headphones
Dual samarium-cobalt transducers with sensitivity of 103 dB/mW (2 dB @ 1 kHz, 359) provide the perfect match for the FT-840, taking full advantage of the spectaclular audio performance. FIF232C CAT System Interface
To control the 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 SC-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 FT-840, and allows convenient automatic antenna matching. The FC-10’s size and appearance is styled to match the 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.O-MHz Amateur 1O-meter simplex and repeater operation.
MMB-20 Mobile Mounting Bracket

SPECIFICATIONS

GENERAL
Receiving Frequency Range: 100 kHz-30 MHz
Transmitting Frequency Range:
160 10 meter Amateur Bands Frequency Stability: ±10 ppm (or ±500 Hz FM’), from 0 -+40°C and ±2 ppm (or ±300 Hz FM”), from 0-+50C (w/TCXO-4 option)
Emission Modes: USB, LSB (J3E), CW (A1A), AM (A3E), FM’ (F3E)
Frequency Tuning Steps: 10 Hz/100 Hz (CW, SSB) 100 Hz/1 kHz (AM, FM’)
Antenna Impedance: son nominal Operating Temp. Range: –10-+50°C
Supply Voltage: 13.5-V DC ±10% negative ground
Power 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
TRANSMITTER
Power Output: Adjustable up to 100 watts (25 watts AM carrier)
Modulation types: SSB: Balanced, filtered carrier
AM: Low-level (early stage)
FM: Variable reactance
Maximum FM 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
3rd-order IMD: -25 dB @100 watts PEP, 14.2 MHz Microphone Impedance: 500 t0 6002
RECEIVER
Circuit Type: dual-conversion superheterodyne Intermediate Frequencies: 1st 47.055 MHz 2nd 8.215 MHz 3rd 455 kHz (FM’)
Sensitivity: (for 10 dB S/N, 0 dB = 1 V FM 12 dB SINAD)

Fjoluee(riar| 150cH-2z50| 250-500 kHz| Ofi-EL8| 1/8/30
---|---|---|---|---
SSB,CW
(2.4 kHz)| < 5pV| < 2 V| < 1\/| <0 25\/
AM
16 kHz)| < 40 pV| < 16 V| <8V| < ‘ pV
FM'(28-30 MHz)
(8 kHz)| —| —| —| <0.5\/

Selectivity: (-6/-60 dB) ripple 3 dB or better

Squelch Sensitivity:
1.8-30 MHz (CW, SSB, AM): < 2.0 µV 28-30 MHz (FM”): < 0.32 V
IF Rejection (1.8-30 MHz): 60 dB or better
Image ejection (1.8-30 MHz): 70 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 1.5 watts into 4Q with < 10% THD Audio Output Impedance: 4 to an
FM operation requires optional unit.
Specifications are subject to change, in the interest of technical improvement, without notice or obligation.
YAESU MUSEN CO., LTD.
4-8-8 Nakameguro, Meguro-ku, Tokyo 153-8644, Japan 2000.2.UA
B92001 16C Printed In Japan
YAESU U.S.A.
17210 Edwards Rd., Cerritos, CA 90703, U.S.A.
YAESU EUROPE B.V.
P.O. Box 75525 1118 ZN, Schiphol The Netherlands
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
YAESU GERMANY GmbH
Am Kronberger Hang 2, D-65824
YAESU HK LTD.
11th Floor Tsim Sha Tsui Centre, 66 Mody Rd.,
Tsim Sha Tsui East, Kowloon, Hong Kong

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