Block diagram of a 20m SSB transmitter. The first SSB transceiver I developed was for 20m, which is arguably the most fun HF band. The marine net is on 14.300. Lots of DX during the daytime hours.

The result is a PCB with a complete transceiver controlled by an ATmega328 and sporting an OLED display, and an interesting introduction to these devices. The Si4720 internal block diagram ...

NBFM or Narrow Band Frequncy Modulation is used in this 27 MHz transmitter circuit schematic. This circuit is an application by Motorola MC2833 – VHF transmitter with FM modulation and narrow band in ...

The proposed architecture focuses on minimizing self-interference (SI), the leakage of the transmitted signal (TX) into the receiver (RX). By adopting a symmetric antenna design and implementing a ...