Description:
<br />This is a very small volume of a simple 40 meter band micro-power amplitude telegraph transceiver,9V square battery or external 9-12V DC power supply.Spread good time,and the nearby provinces hundreds of kilometers amateur radio communication.This hine was first introduced by domestic radio enthusiasts,but also it is played a nice name  frogs .
<br />The frogs calling kit 3.1 public version based combined with the actual usage Fixed several key issues,after several debugging before the formation of the current version.
<br />Key indicators
<br />Power supply: 9-12VRecommended 12V linear regulated power supply
<br />Antenna: 50 ohm,unbalanced
<br />Transmission power: 2W9V  3W12V
<br />Frequency: transmitter local oscillator frequency:7023KHz;receive local oscillator frequency:about 7023-7026KHz
<br />Operating mode:CW
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<br />Use
<br />This hine is simple direct conversion transceiver interference,selectivity can be compared and the super heterodyne receiver,it is necessary to use not worse than the length of a half-wave dipole antenna,or communication is relatively poor.The selection disturbance is relatively small;spread the good opportunity for communication experiment,it is best to make an appointment with your friend s communication.Communication distance of about 150-300km more secure,to greater distance depends on the propagation enviroment and the operator s operating skills.If the broadcast interference is relatively large,use 5K GAIN potentiometer signal attenuation,emergent signalthe radio interference.Attenuation potentiometer is critical,carefully adjusted;you will receive an unexpected effect.In the dissemination of good times with of this hine FT80C goods shortwave radio with a signal on a distant contrast reception,this local effect is no difference between basic commodity hine,which makes unexpected.
<br />Recommendations for improvement
<br />1N4001 replaced by appropriate varactor tube recommended the 0p-100p,can increase the receive frequency range.
<br />Q1 9018 power between 0.8W-1.2W 8050 power between 1.5W to 2Wselect 8050 will make D882 In a critical state,need to be careful
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<br />Note
<br />Welding, assembly, testing, requires a certain electronic technology, will recognize the device, will be welded, the basic need to debug, as long as the assembly instructions carefully press kit can be successful. If you find a novice welding error,intended to build the first not to dispose of, please contact Professionals to get the appropriate technical guidance.
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<br />Package include:
<br />1X V3 CW transceivers telegraph shortwave reported 7.023-7.026MHz radio kit