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 machine was first introduced by domestic radio enthusiasts,but also it is played a nice name “frogs”.
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.
Power supply: 9-12V(Recommended 12V linear regulated power supply)
Antenna: 50 ohm,unbalanced
Transmission power: 2W(9V) 3W(12V)
Frequency: transmitter local oscillator frequency:7023KHz;receive local oscillator frequency:about 7023-7026KHz
This machine 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 signal from the radio interference.Attenuation potentiometer is critical,
carefully adjusted;you will receive an unexpected effect.In the dissemination of good times with of this machine FT80C goods
shortwave radio with a signal on a distant contrast reception,this local effect is no difference between basic commodity machine,
which makes unexpected.
Recommendations for improvement
1N4001 replaced by appropriate varactor tube (recommended the 0p-100p),can increase the receive frequency range.
Q1 9018 power between 0.8W-1.2W 8050 power between 1.5W to 2W(select 8050 will make D882 In a critical state,need to be careful)
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.
1X V3 CW transceivers telegraph shortwave reported 7.023-7.026MHz radio kit
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