THE english manual : HTTPS://www.lxqqfy.com/S-RockMite/S-RockMite%20User%20Manual.pdf

 

 

This is a very small volume of simple 40 meter band micro-power amplitude telegraph transceiver, Despite it's small size and DC receiver limitations, it is capable of working several hundred miles when connected to a good 40 meter antenna.

 

There are many versions of "RockMite", "RockMite SWL", "RockMite PIC", "RockMite 51", and ”S-RockMite”. ”S-RockMite” is so far the latest version. "RockMite 51" and ”S-RockMite” is designed by “LXQQFY.com”. The new product adds the following new features.

 

The vertical resistance changed to horizontal resistance.

 

It do not distinguish between positive and negative input power.

 

Provide acrylic case.

 

Provide WIFI module options. Support automatic key and automatic transmitter.

 

Can connect the phone to change the configuration.

 

 

Power supply: 9~13.8 Volts DC, >1A (Recommend the use of batteries)

 

Antenna: 50ohm, 7MHz, SWR<2.0

 

Receive: static current 60mA

 

Transmission power: 5W

 

Frequency: launch the vibration frequency,7023 KHZ

 

Receives the local oscillator frequency: about

 

7023-7023 KHZ work mode: the CW

 

KEY: Manual and automatic auto-detection

 

Automatic sending: ok

 

Config: the mobile phone application (WIFI)

 

Case: acrylic

 

 

Reference schematic diagram.Receiving part is the core of a NE602,inside it includes an oscillating circuit and a balanced mixer,antenna in the signal after 2 crystal filter,into the mixer, The basic oscillation signal is sent out by the 9018 oscillation circuit, two signals through mixing,directly put the CW signal frequency conversion for audio, NE602 output audio and then sent to the NE5532 to do the active low-pass filter and audio amplification, so that the whole process of the reception. it is called "DC receiver". 2N7000 field effect tube is used for closing reception at launch. At the same time, the WIFI module generates the side sound, which is output to the earphone. The launch part uses 9018 to do the oscillation circuit, then the 8050 makes the buffer enlargement. 8050 is also used as a launch key control, control transceiver circuit and signal switching. The last stage is composed of a D882 class C amplifier, matched by 1:4 transformer, after LPF filter is connected with the antenna.

 

 

 

9018 magnification is about 130 , D882 magnification is about 200. T1 is 1:4 transmission line transformer, in FT37-43 iron and oxygen magnet ring bodies (black) using 0.51 mm paint envelope double hinge line in and around six times, then connecting a coil with a head and a tail. T2 is the high frequency transformer, in FT37-43 iron and oxygen magnet ring bodies (black) using 0.51 mm paint covered wire for winding, Primary 8 turn, secondary 2 turn. L1 L2 is the high frequency filter inductance in T37-2 on the iron core is circular and(red) using 16 to 0.5 mm enameled wire around.