Subj : Todays New Gear Tip
To   : All
From : Daryl Stout
Date : Thu Jul 27 2017 12:08 am

Computer Interfaces 

What if you want to make digital mode contacts using a PC or just 
control the rig from the PC keyboard? There are several software 
packages available and some are even free! There are three types of 
computer interface connections to ham radios. 

The first is a control port by which a PC can read, change, and operate
many, if not all, of the radio’s control functions. This allows a PC to
monitor and record your radio's configuration for logging contacts and
other useful functions. Radios "speak" a control protocol that is unique
to each manufacturer. Most radio control ports are a serial or COM port
for communicating with the PC. (Icom radios use a proprietary CI-V
interface.) PC manufacturers are dropping the COM or serial port, but
USB-to-serial port converters are available to solve that problem. 

The second type are called keying interfaces or voice keyers that 
allow the PC to key the radio (to send CW) from the keyboard or send 
recorded speech through the microphone jack. These are often used 
during competitive events called contests or radiosport. 

The third type of interface supports digital modes, such as radio-
teletype (RTTY) or PACTOR, the mode used by the ham radio email 
network known as Winlink. The computer's sound card is connected to the
microphone and headphone jacks through a data interface, available from
several manufacturers. These devices isolate the radio's input from the
sound card's output, preventing hum, RF feedback, and other problems.
If your radio has a data port, the computer can send and receive data
directly from the radio without using audio to or from your sound card.
Interface cables are usually available for specific radios from the
interface manufacturer.


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