FT-847_Opr Man.pdf

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1、FT-847 OPERATING MANUAL YAESU MUSEN CO., LTD. 4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, 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, H

2、ampshire, SO23 0LB, U.K. YAESU GERMANY GmbH Am Kronberger Hang 2, D-65824 Schwalbach, Germany YAESU HK LTD. 11th Floor Tsim Sha Tsui Centre, 66 Mody Rd., Tsim Sha Tsui East, Kowloon, Hong Kong General description . 1 Specifications. 2 Accessories built-in low-noise preamplifiers; DSP Noise Reduction

3、, Notch, and Bandpass Filters; AFSK I/O port for teletype, HF packet, AMTOR, or high-speed CW work; 1200/9600 bps packet jack for VHF/ UHF; two tuning knobs plus Shuttle-Jog dial for easy frequency navigation; direct keyboard frequency entry; Digital Speech Processor; adjustable CW pitch/sidetone; a

4、lpha-numeric label tags for labeling satellite memories; built-in CW electronic keyer with weight control; built-in CTCSS/DCS encode-decode operation for FM; and a high-speed (up to 57600 bps) CAT port for external computer control. Available options include Collins Me- chanical IF Filters for SSB a

5、nd CW, and the FVS-1A Voice Synthesizer for visually impaired operators. Thank you for your investment in the FT-847 Earth Station. We recommend that you read this manual in its entirety as soon as possible, so as to gain a fuller understanding of the many capabilities of your new transceiver. Gener

6、al Description HF + V UHF ALL MODE TRANSCEIVER FT-847 2 FT-847 OPERATING MANUAL GENERAL Frequency Range:Receive100 kHz - 36.99 MHz 37 - 76 MHz 108 - 174 MHz 420 - 512 MHz Transmit160 - 6 Meters 2 Meters 70 Centimeters (Amateur bands only) 5.1675 MHz (Alaska Emergency Channel) Emission Modes:USB, LSB

7、, CW, AM, FM, F1 (9600 bps Packet), F2 (1200 bps Packet), AFSK Synthesizer Steps (Min.):0.1 Hz (CW/SSB) 10 Hz (AM/FM) Antenna Impedance:50, Unbalanced Operating Temp. Range:10C to +50C (14F to 122F) Frequency Stability:Better than 2 ppm (0C to +40C) SSB/CW/AM/AFSK Better than 5 ppm (10C to +50C) SSB

8、/CW/AM/AFSK Better than 1 kHz 5 ppm FM Power Requirements:DC 13.8V - 10%, Negative Ground Current Consumption:Receive (Squelched): 1.5A Receive (Max. Audio): 2.0A Transmit: 22A ( 100W RF output) Case Size:260(W) x 86(H) x 270(D) mm (10.24” x 3.39” x 10.63”) Weight:Approximately 7 kg (14.4 lbs.) TRAN

9、SMITTER Power Output:160 - 6m:100 Watts (25 Watts AM carrier) 2m/70cm:50 Watts (12.5 Watts AM carrier) Modulation Types:SSB: Balanced Modulator FM:Variable Reactance AM: Early Stage (Low Level) FM Maximum Deviation:5 kHz (2.5 kHz on FM-N) Spurious Radiation:Harmonics: At least 40 dB down (1.8 - 29.7

10、 MHz) At least 60 dB down (50/144/430 MHz) Non-harmonic: At least 50 dB down (1.8 - 29.7 MHz) At least 60 dB down (50/144/430 MHz) Carrier Suppression:At least 40 dB Opp. Sideband Suppression: At least 40 dB 3rd-Order IMD:At least 31 dB down (14 MHz, 100W PEP output) SSB Frequency Response:400 Hz -

11、2600 Hz (6 dB) Microphone Impedance:200 - 10k (Supplied microphone: 600) Specifications 3 FT-847 OPERATING MANUAL RECEIVER Sensitivity:SSB/CWAM-NFM 500 kHz - 1.8 MHz:20 V 1.8 - 28 MHz:0.25 V2 V 28 - 30 MHz:0.25 V2 V0.5 V 50 - 54 MHz:0.20 V1 V0.25 V 144/430 MHz:0.125 V0.2 V (Above specifications are

12、worst-case. SSB/CW/AM-N figures are for 10 dB S/N, 12 dB SINAD on FM) Squelch Sensitivity:SSB/CW/AMFM 500 kHz - 1.8 MHz:20 V 1.8 - 28 MHz:2 V 28 - 30 MHz:2 V0.25 V 50 - 54 MHz:1 V0.20 V 144/430 MHz:0.5 V0.16 V Image Rejection:Better than 60 dB IF Rejection:Better than 60 dB Selectivity (6/60 dB):SSB

13、/CW:2.2 kHz/4.5 kHz CW-N:0.5 kHz/2.0 kHz (Optional YF-115C installed) AM:9 kHz/20 kHz AM-N:2.2 kHz/4.5 kHz FM:15 kHz /30 kHz FM-N:9 kHz/20 kHz Audio Output:At least 1.5W into 8 10% THD Audio output impedance:4 - 16 Specifications are subject to change, in the interest of improvement, without notice

14、or obligation. Specifications are guaranteed only within Amateur bands. Specifications 4 FT-847 OPERATING MANUAL Accessories and The BLACK DC power lead connects to the NEGA- TIVE (-) DC terminal. For base station installations, Yaesu recommends the use of the FP-1025 or FP-1030A AC power supplies.

15、Other models of power supplies may be used with the FT-847, but the 13.8V DC input voltage, 22-Ampere current capability, and DC cable polarity guidelines described above must be strictly followed. Note that other manufacturers may use the same type of DC power connections as does your FT-847 trans-

16、 ceiver, but the wiring configuration of the other manufacturers plug may be different from that speci- fied for your transceiver. Serious damage can be caused if improper DC connections are made; consult with a qualified service technician when in doubt. In mobile installations, noise pickup may be

17、 minimized by connecting the DC cable directly to your vehicles battery, rather than to the ignition switch or “acces- sory” circuitry. Direct connection to the battery also provides the best voltage stability. 7 FT-847 OPERATING MANUAL Tips for Successful Mobile Installations: ? Before connecting t

18、he DC cable to the battery, mea- sure the voltage across the battery terminals with the engine running fast enough to show a charge. If the voltage is above 15 Volts, the vehicles voltage regulator should be adjusted to reduce the charg- ing voltage to 14 Volts or lower. ? Route the DC cable as far

19、away from the ignition cables as possible, and cut off any excess cable (from the battery end) to minimize voltage drop. ? If the DC cable is not long enough, use #12 AWG (minimum) stranded, insulated wire to extend it. Be certain to solder the connections at the splice securely, and provide ample i

20、nsulation for the sol- dered splice (heat shrink tubing plus black electri- cal tape work well). ? Be sure that the POWER switch on the FT-847 is OFF when connecting the DC cables connector to the rear panel 13.8VDC jack. ? Be sure that the POWER switch on the FT-847 is OFF when starting your car. T

21、here initially may be no voltage regulation, which may cause erratic operation of your transceivers microprocessor. ? Check the battery terminal connections frequently to be sure they are tight and not corroded. Installation POWER CONNECTIONS Caution Permanent damage can result if improper sup- ply

22、voltage, or reverse-polarity voltage, is ap- plied to the FT-847. The Limited Warranty on this transceiver does not cover damage caused by application of AC voltage, reversed polarity DC, or DC voltage outside the specified range of 13.8V 10%. When replacing fuses, be certain to use a fuse of the pr

23、oper rating. The FT-847 requires a 25A fast-blow fuse. 8 FT-847 OPERATING MANUAL GROUNDING The provision of an effective ground system is impor- tant in any successful communications station. A good ground system can contribute to station efficiency in a number of ways: ? It can minimize the possibi

24、lity of electrical shock to the operator. ? It can minimize RF currents flowing on the shield of the coaxial cable and the chassis of the trans- ceiver which may cause interference to nearby home entertainment devices or laboratory test equipment. ? It can minimize the possibility of erratic transce

25、iver operation caused by RF feedback or improper cur- rent flow through logic devices. An effective earth ground system may take several forms; for a more complete discussion, see an appro- priate RF engineering text. The information presented below is intended only as a guideline. Base Station Eart

26、h Grounding Typically, the ground connection consists of one or more copper-clad steel rods, driven into the ground. If multiple ground rods are used, they should be config- ured in a “V” configuration, and bonded together at the apex of the V which is nearest the station location. Use a heavy, brai

27、ded cable (such as the discarded shield from type RG-213 coaxial cable) and strong cable clamps to secure the braided cables to the ground rods. Be sure to weatherproof the connections to ensure many years of reliable service. Use the same type of heavy, braided cable for the connections to the stat

28、ion ground bus (described below). Do not use gas line pipes in an attempt to provide a ground connection! To do so creates a serious risk of explosion! Inside the station, a common ground bus consisting of a copper pipe of at least 25 mm (1”) diameter should be used. An alternative station ground bu

29、s may con- sist of a wide copper plate (single-sided circuit board material is ideal) secured to the bottom of the operat- ing desk. Grounding connections from individual de- vices such as transceivers, power supplies, and data communications devices should be made directly to the ground bus using a

30、 heavy, braided cable. Do not make ground connections from one electrical device to another, and thence to the ground bus. This so-called “Daisy Chain” grounding technique may nullify any attempt at effective radio frequency ground- ing. See the drawings below for examples of proper and improper gro

31、und connections. Inspect the ground system inside the station as well as outside on a regular basis so as to ensure maxi- mum performance and safety. Installation 9 FT-847 OPERATING MANUAL Installation GROUNDING Mobile Station Grounding Although satisfactory grounding in most installations will be a

32、chieved via the DC cables negative lead and the antenna systems coaxial cable shield, it is often recommended that you provide a direct ground con- nection to the vehicle chassis at the mounting loca- tion of the transceiver. Due to unexpected resonances which may naturally occur in any location, im

33、proper communication system performance may result from insufficient grounding. These symptoms may include: ? RF feedback (resulting in distortion of your transmitted signal); ? Unintended frequency change; ? Blinking or blanking of the frequency display; ? Noise pickup; and/or ? Loss of memory. Not

34、e that these conditions may occur in any commu- nications installation. The FT-847 includes extensive filtering designed to minimize the chance of such prob- lems; however, random currents set up by insufficient RF grounding can nullify such filtering. Bonding the rear panel Ground lug of the FT-847

35、 transceiver to the vehicle or vessels ground system should clear up any such difficulties. Yaesu does not recommend the use of “on glass” mo- bile antennas unless the shield of the coaxial cable is securely grounded near the feedpoint of the antenna. Such antennas frequently are responsible for the

36、 ground-related difficulties described above. 10 FT-847 OPERATING MANUAL ANTENNA CONSIDERATIONS Installation The antenna systems connected to your FT-847 trans- ceiver are, of course, critically important in ensuring successful communications. The FT-847 is designed for use with any antenna system p

37、roviding a 50 re- sistive impedance at the desired operating frequency. While minor excursions from the 50 specification are of no consequence, the power amplifiers protec- tion circuitry will begin to reduce the power output of there is more than a 50% divergence from the speci- fied impedance (les

38、s than 33 or greater than 75, corresponding to a Standing Wave Ratio (SWR) of 1.5:1). Four antenna jacks are provided on the rear panel of the FT-847, using two different types of connectors. Three of these jacks are “Type M” (SO-239) jacks; these are the HF, 50 MHz, and 144 MHz jacks. The other jac

39、k is a “Type N” jack, which is the 430 MHz jack. The center pins of these two jack types are of very different diameters, and damage (not covered by your transceivers Limited Warranty) will be caused if you attempt to connect a Type M (PL-259) plug to the 430 MHz Type N jack. It is best to confirm v

40、isually that you are connecting your coaxial cables to the correct jacks. Guidelines for successful base and mobile station in- stallations are shown below. Base Station Antenna Installations When installing a “balanced” antenna such as a Yagi or dipole, remember that the FT-847 is designed for use

41、with an (unbalanced) coaxial feedline. Always use a balun or other balancing device so as to ensure proper antenna system performance. Use high-quality 50 coaxial cable for the lead-in to your FT-847 transceiver. All efforts at providing an efficient antenna system will be wasted if poor qual- ity,

42、lossy coaxial cable is used. Losses in coaxial lines increase as the frequency increases, so a coaxial line with 0.5 dB of loss at 7 MHz may have 6 dB of loss at 432 MHz (thereby consuming 75% of your transceivers power output!). As a general rule, smaller- diameter coaxial cables tend to have highe

43、r losses than larger-diameter cables, although the precise differences depend on the cable construction, materials, and the quality of the connectors used with the cable. See the cable manufacturers specifications for details. For reference, the chart below shows approximate loss figures for typical

44、ly-available coaxial cables frequently used in HF installations. CABLE TYPE LOSS 1.8 MHz28 MHz432 MHz RG-58A0.552.6010 RG-58 Foam0.542.008.0 RG-8X0.391.857.0 RG-8A, RG-2130.271.255.9 RG-8 Foam0.220.883.7 Belden 99130.180.692.9 7/8 Hardline0.10.251.3 Loss in dB per 30m (100 feet) for Selected 50 Coax

45、ial Cables (Assumes 50 Input/Output Terminations) Loss figures are approximate; consult cable manufacturers catalogs for complete specifica- tions. 11 FT-847 OPERATING MANUAL Installation Always locate antennas such that they can never come in contact with outdoor power lines in the event of a catas

46、trophic support or power-pole structural failure. Ground your antennas support structure(s) adequately, so as to dissipate energy absorbed during a lightning strike. Install appropriate lightning arrestors in the antenna coaxial cables (and rotator cables, if rotary antennas are used). In the event

47、of an approaching electrical storm, dis- connect all antenna lead-in, rotator cables, and power cables completely from your station if the storm is not immediately in your area. Do not allow discon- nected cables to touch the case of your FT-847 trans- ceiver or accessories, as lightning can easily

48、jump from the cable to the circuitry of your transceiver via the case, causing irreparable damage. If a lightning storm is in progress in your immediate area, do not attempt to disconnect the cables, as you could be killed in- stantly if lightning should strike your antenna struc- ture or a nearby p

49、ower line. If a vertical antenna is utilized, be certain that humans and/or pets and farm animals are kept away both from the radiating element (to prevent electrical shock and RF exposure danger) and the ground system (in the event of an electrical storm). The buried radials of a ground-mounted vertical antenna can carry lethal volt- ages outward from the center of the antenna in the event of a direct lightning strike. ANTENNA CONSIDERATIONS Mobile Antenna Install