Radio Propagations


Solar X-rays:
Status
Geomagnetic field:
Status
D-Region Absorption
Prediction:
Status
Created by PA4RM

Solar Terrestrial data


Created by PA4RM

Login Form

CW is the simplest form of modulation. The output of the transmitter is switched on and off, typically to form the characters of the Morse code.

CW transmitters are simple and inexpensive, and the transmitted CW signal doesn't occupy much frequency space (usually less than 500 Hz). However, the CW signals will be difficult to hear on a normal receiver; you'll just hear the faint quieting of the background noise as the CW signals are transmitted. To overcome this problem, shortwave and ham radio receivers include a beat frequency oscillator (BFO) circuit. The BFO circuit produces an internally-generated second carrier that "beats" against the received CW signal, producing a tone that turns on and off in step with the received CW signal. This is how Morse code signals are received on shortwave.

{play}http://www.pa4rm.com/attachments/076_cw.mp3{/play} CW test sample

eQSL.cc


Check your eQSL


Created by PA4RM

HAM contests

ico6 WA7BNM Contest Calendar

QRZ.COM


Search in QRZ.COM


Created by PA4RM
DMC Firewall is a Joomla Security extension!