Amateur Radio Wiki - User contributions [en]

Radio/PC Interfaces

2008-02-07T19:06:59Z

Pentaquark: New page: There are many brands of interface available to connect a PC to an amateur radio transceiver. They all do essentially the same thing. They key the radio to transmit, pass a signal based on...

There are many brands of interface available to connect a PC to an amateur radio transceiver. They all do essentially the same thing. They key the radio to transmit, pass a signal based on the mode of operation from the PC to the radio, then un-key to go back into receive mode. Some automatically bypass the microphone during transmission but allow the operator to override the computer simply by keying the mike. One example is the RIGblaster but there are others. They generally work with any PC soundcard based software, digital or analogue.

SSTV

2008-02-07T18:43:24Z

Pentaquark: New page: SSTV is a mode that uses a computer and an amateur radio transceiver to send and receive images over radio.

SSTV is a mode that uses a computer and an amateur radio transceiver to send and receive images over radio.

Help:Contents

2008-02-07T18:37:21Z

Pentaquark: Removing all content from page

Wire Antenna

2008-02-07T18:36:41Z

Pentaquark: Dipole

Many amateur radio antenna systems use a simple wire to carry the RF current in such a way as to radiate. One of the simplest is the dipole. When a dipole oscillates current, in sync with the radio's RF output during a transmission, the magnetic field generated around the wire expands and contracts very quickly, in most cases millions of times per second. It is the outer most part on the field that is radiated away.

The shape of a dipole resembles the letter "T". The middle leg connects the radio to the center of the upper, horizontal legs. There are several ways to make the connection. The simplest has the coax shield connected to one side and the center conductor connected to the other side. This works but there are losses at the connection due to impedance mismatch. A better way is to make or purchase a "balun". A balun matches the impedance of the radio to the impedance of the dipole more closely. This increases the power actually transferred to the upper legs of the dipole. (Balun stands for BALanced to UNbalanced.)

Help:Contents

2008-02-07T18:34:00Z

Pentaquark:

Help:Contents

2008-02-07T18:32:33Z

Pentaquark: Simple dipole

Many amateur radio antenna systems use a simple wire to carry the RF current in such a way as to radiate. One of the simplest is the dipole. When a dipole oscillates current, in sync with the radio's RF output during a transmission, the magnetic field generated around the wire expands and contracts very quickly, in most cases millions of times per second. It is the outer most part on the field that is radiated away.

The shape of a dipole resembles the letter "T". The middle leg connects radio to the center of the upper, horizontal legs. There are several ways to make the connection. The simplest has the coax shield connected to one side and the center conductor connected to the other side. This works but there are losses at the connection due to impedance mismatch. A better way is to make or purchase a "balun". A balun matches the impedance of the radio to the impedance of the dipole more closely. This increases the power actually transferred to the upper legs of the dipole. (Balun stands for BALanced to UNbalanced.)