A typical Indian QRP station will use a modified AM broadcast (BC) receiver, for the receiving part. The transmitter will usually have a final RF power amplifier using BD139 (or some power MOSFET like IRF530), driven by a Variable Frequency Oscillator (VFO) and chain of buffer/driver amplifiers (2-3 stage). Most of the stations use Amplitude Modulation (AM). Commonly available medium power Hi-Fi audio amplifier modiles using integrated circuits (like the TBA810), driving a modulation transformer forms the AM modulator part.
The most popular design of AM transmitter in use right now is by VU2VWN, Vasanth. The basic design is for the 40m band. Several adaptations of this basic design exist.
Click here for a typical Indian QRP station arrangement and schematic. This was drawn by my friend VU2UCY, Bhasi (Silent Key). Hundreds of QRP stations using similar station setup are on the air !
Hosted by Geocities Get Your FREE Home Page !
