7.023 MHz croak suite V3 version CW short-wave radio transmitter-receiver KIT

Description

7.023 MHz croak suite V3 version  CW short-wave radio transmitter-receiver  kit
The product is kit and needs to be assembled by the buyer
This is a very small volume of simple 40 meters micropower continuous cable transceiver, use the 9 v battery power supply. Can spread in good time, and hundreds of kilometers in nearby provinces of amateur radio communication.
Main indicators
Power supply: dc 9 v - 14 v
Antenna: 50 ohms, is not balanced
Receive the static current: ma @ 9 of 12 v
Transmission power: 12 v / 3 w, 9 v / 2 w
Vibration frequency range: launch the 7.023 MHz, receives the local oscillator 7.023 7.026 MHz (7.023 MHz crystals)
Working pattern: the CW
Circuit principle
Receive part of the core is a NE602, antenna in signal through a crystal filter and the attenuation of potentiometer, after enter the mixer, oscillation circuit at the receiving frequency oscillation, two signals through mixing, directly to the SSB/the CW signal frequency conversion for audio, NE602 output again gave LM386 audio amplifier, this completes the process. So using the rf signals directly mixing into audio receiver to be called "DC receiver".
Launch part using the NE602 oscillation circuit, and then to do the buffer amplifier, 9018, 9018 and as the launch button, control of sending and receiving circuit and signal switch, at the end of the class is made up of D882 C amplifier, after amplification, the high frequency signal after LPF filtering antenna.
Method of use
Because this machine is a simple direct frequency transceiver, anti-jamming and selective couldn't compared with superheterodyne receiver, so must use not bad Yu Quanchang half wave dipole antenna, otherwise the communication effect is poorer. Choose the interference is small, spread good opportunity for communication experiment, the best reservation communication with friends. Communication distance in 150-150 km is guaranteed, main distance more see the propagation environment and operator's skills. If radio interference is large, with a 5 k GAIN potentiometer attenuation signal, can dash forward show from radio interference signal. The attenuation potentiometer is key to adjust carefully, will receive unexpected results.
Shipment quantity: 1pcs