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There are several QRP clubs that have published documentation on this small transceiver: I remember the G-QRP that published "The Pixie File" a pdf with a collection of schematics, easily available on the internet. Generally these RTXs suffer from strong input signals,
Introduction. The Pixie 2 is a small, versatile radio transceiver that is very popular with QRP (low power) amateur radio operators the world over. It reflects a history of contributions from amateur radio operators looking to build the simplest transceiver possible.
The purpose of the Ramsey Electronics series of QRP transmitters is to give our amateur radio customers the option of picking up a truly complete and reliable transmitter kit for whenever you need a compact CW
The schematic of the NS-40 circuit is shown in Figure 1. At first glance, there is no real difference between the schematics of a Class-E PA and the more common Class-B or –C amps. The difference is in the exact values of the inductors and capacitors surrounding the final MOSFET. The Class-E power amplifier has a much lower Q tuned circuit at the
The NorCal 40 is a compact 40-meter CW transceiver optimized for ease of assembly and use. It is particularly well-suited to portable, battery-powered operation, having very low receive-mode current drain. To make assembly as easy and trouble-free as possible, all
The µSDX is a simple but very efficient QRP Multimode Shortwave Transceiver, that is able to transmit and receive SSB, CW, AM and FM. It can be configured for any Shortwave Band by exchanging/modifying RF PCB.
One (Cl, BANDSET) tunes the entire band, while the other (C2) is a bandspread control with a total range of only 25 kHz. This scheme seems to be practical for a simple transceiver. The receiver begins with a doubly tuned preselector and a diode-ring mixer (UI, a Mini-Circuits SBL-I).
