Tag: cable

via HACKADAY: Radio Antenna Mismatching: VSWR Explained

If you have ever operated any sort of transmitting equipment, you’ve probably heard about matching an antenna to the transmitter and using the right co-ax cable. Having everything match — for example, at 50 or 75 ohms — allows the most power to get to the antenna and out into the airwaves. Even for receiving […]

National Geographic Channel Ham Radio Guide Supports Before MARS Prequel

The National Geographic has produced A Guide to Ham Radio to support its recently released digital short, Before MARS — a prequel to its upcoming MARS series. The 33-minute prequel, which has a heavy Amateur Radio theme, provides the back story of two principal characters in the upcoming MARS global event series. In the prequel, […]

via HACKADAY: What’s Special about Fifty Ohms?

If you’ve worked with radios or other high-frequency circuits, you’ve probably noticed the prevalence of 50 ohm coax. Sure, you sometimes see 75 ohm coax, but overwhelmingly, RF circuits work at 50 ohms. [Microwaves 101] has an interesting article about how this became the ubiquitous match. Apparently in the 1930s, radio transmitters were pushing towards […]