Prior to the introduction of continuous wave transmitters and receivers, the detector used for spark gap communication would have made it difficult to hear a CW transmission (lacking a BFO). So, even though wireless transmission and reception of International Morse Code dates back earlier than 1919...
A couple of years ago I went back to basics and started to build simple, crystal-controlled transmitters for the HF ba... D Tilley - 《Practical Wireless》 被引量: 0发表: 2023年 迎接5MHz时代的到来 一款QRP CW电台的电路设计 2015年世界无线电通信大会(WRC-15)上各国讨论决定,将53515～5366.5...
When we first spotted the article about a one-transistor amateur radio transceiver, we were sure it was a misprint. We’ve seen a lot of simple low-power receivers using a single transistor, and a fair number of one-transistor transmitters. But both in one package with only a single activ...
Thanks to EER transmitters E-level, it has high power efficiency (no bulky heat sink required), and simple design (no need for complex balanced linear power amplifiers). SSB transmitters stage based entirely on digital and software: By controlling the phase of the SI5351 PLL (via the tiny ...
QRP, In Amateur "Ham" Radio, means to voluntarily limit your transmitter's output power to 5 watts or less (QRPp means one watt or less...). In a world of 50,000 watt AM broadcast stations and 1,000,000-watt digital TV transmitters why would anyone want to actually reduce their pow...
This board is a universal radio project controller, with an ATMega328P(U) microcontroller and lots of options. The intention was for it to become a basic building block in transceivers, receivers, transmitters, signal generators, anywhere you need either a digital controller, one to three clocks...
Provision for on board piezo speaker OR a larger, louder piezo in the enclosure. Autospacing between characters (may be turned off). Dash/Dot paddle swap command Keyed line goes low when active NOTE: Do notuse the EZKeyer III with tube transmitters without an interface. ...
needed parts. And that is part of what ham radio can be all about. 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 ...
Steve Weber (KD1JV) has designed a combination power meter/SWR bridge with a switchable internal dummy load. It is a nice addition to any QRP station for general use, tweaking transmitters, and testing antennas. It uses the Texas Instrument MSP430G2152 MCU powered with an ordinary 3V Lithium...
one for the Raspberry Pi and one for the radio. The cooling fan on the larger box (the Pi box) not only cools the Raspberry Pi, but also cools the radio using a baffle between the two boxes. A big thanks to Freddie Mac – Your Ham Radio Crusader for his instructional videos on AllS...