TAK-40_使用说明书手册_2008

INTRODUCTIONThe TAK-40 transceiver is designed specifically for the ARRL Homebrew Challenge contest.Thefollowing is a list of the criteria for the contest and a brief description of how the TAK-40 meets therequirements:The station must include a transmitter and receiver that can operate on the CW and voice segments of 40meters.The TAK-40 covers 7.0 to 7.3 MHz.It must meet all FCC regulations for spectral purity.All spurious emissions from the TAK-40 are at least43 dB below the mean power of fundamental emission.It must have a power output ofat least 5 W PEP.The TAK-40 generates at least 5 watts PEP for voice andCW modes.The ALC can be set as high as 7 watts.It must operate from either 120 V ac mains or a 13.8 V dc power supply.The TAK-40 operates on a 13.8VDC supply and draws less than 0.2A during receive and less than 3A during transmit.It can be constructed using ordinary hand tools.Construction of the TAK-40 uses all leaded componentsand assembly only requires hand tools,soldering iron,and an electric drill (helpful but not strictlynecessary).It must be capable ofoperation on both voice and CW.The TAK-40 operates lower and upper sideband(USB and LSB)as well as CW.USB was included to allow the TAK-40 to easily operate in digital modeslike PSK-31.Parts must be readily available either from local retailers or by mail order.No "fea market specials"allowed.The TAK-40 is constructed from materials available from Digikey,Mouser,Jameco and Amidon.Any test equipment other than a multimeter or radio receiver must either be constructed as part of theproject or purchased as part of the budget.The TAK-40 only requires a multimeter for construction,extensive built-in setup functions are included in the software including a frequency counter to align theoscillators and a programmable voltage source for controlling the oscillators.Equipment need only operate on a single band,40 meters.Multiband operation is acceptable andencouraged.The TAK-40 operates on the 40 meter band.Frequency control can be by VFO or crystal control Some method ofvariable tuning is encouraged.Ifcrystal controlled,only a single crystal must be included in the $50.The TAK-40 has dual VFO's withmemory functions including VFO to Memory and Swap VFO and Memory.Each VFO has it's ownmemory and the current VFO setting is retained during power off.The total cost ofall parts,except for power supply,mic,key,headphones or speaker,and usual suppliessuch as wire,nts and bolts,tape,antenna,solder or ghe must be less than $50.The total parts required tobuilt the TAK-40 is $49.50The TAK-40 also includes some features that make it very smooth to operate:.LSB operation-interoperable with 99%of the voice communications on 40 metersAutomatic Gain Control -regulates the aud io output for strong and weak signalsS-Meter-simplifies signal reports●Digital frequency readout-reads the operating frequency to 100 hzDual Tuning Rates-fast for scanning the band and slow for fine tuningLarge tuning knob-just like comme