Untitled DocumentUntitled Document>>>>This kit need solder, electronic skill and frequency counter for adjustment. pcb design add speaker and power jack<<<<\"Shipping by Thailandpost registered have a tracking number\"
7 MHz (40 meter band) Ham Radio Receiver Kit, (Direct Conversion or DC receiver)
Use 2 JFETs VFO (Osc + buffer) NE602/NE612, LM386, TDA2030
Can receiver 7.000-7.145 MHz** (Or more you can modify)
Use double tuned band pass filter.
Power requirement 12 to 15volt DC from battery Do not use power from switching power supply (Switching make more noise).
Use stereo earphone jack only.
PCB size: 5.8cm x 13cm.
TDA2030 Heatsink included. Schematic + pcb :: the frequency counter check the output frequency of the VFO circuit.
It ok if reading that in the range of 7.000 - 7.200 MHz. (Main Tune)
If the reading is below that mean more inductance on T50-6 you can increase the space of T50-6 for reduce the inductance frequency will be higher.

If all ok connect antenna then use plastic screwdriver adjustment the trimmer capacitors until receiver strongest signal.

Modify Limit capacitors.
More capacitance = wider bandwidth ...but if too more is narrow channel spacing make difficult when tunning.

We are sorry our English is not good we translate it with Google translator.

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