Ham Radio Calculators and Call Sign Lookup
This widget searches the FCC database for amateur radio operator licenses. Simply enter the operator’s callsign, FRN (FCC Registration Number), or name (LAST, FIRST). The results will appear in a new window or tab.
This widget can calculate any of the four major properties of electrical/electronic circuits, voltage, current, resistance, and power. Simply fill in two known values (leaving two values blank), then click the “Find the Two Unknown (Blank) Values” button. The widget will calculate the two unknown values and will display the appropriate engineering unit prefix.
The half-wave dipole is one of the most popular antenna types used by amateur (ham) radio operators. This widget calculates the total length of a half-wave dipole and the length of each leg based upon the frequency, wavelength, and the speed of light (3×108 meters per second). This widget can handle frequencies up to a maximum of 1000 MHz (1 GHz).
The SWR (Standing Wave Ratio) is the relationship between the forward power (sent to the antenna) and the reverse power (reflected back to the transmitter). This widget calculates the SWR given the forward power (in Watts) and the reflected power (in Watts).
DIT-DIT-DIT – DAH-DAH-DAH – DIT-DIT-DIT
Did you get the message? That was SOS in morse code. The Morse Code was developed by Samuel F.B. Morse in the 1800s as a way of transmitting messages along electrical wires which were part of a telegraph system. You can learn morse code by listening to the training audio along with the accompanying text equivalent. It is a fun way to communicate with others.
