DX - The Easy Way by Buck Craig

Author:Buck, Craig [Buck, Craig]
Language: eng
Format: azw3
Published: 2016-03-05T16:00:00+00:00

DIGITAL MODES (PSK AND RTTY)

There are many digital modes but I limit this discussion to PSK and RTTY because they are the most common modes for DX.

PSK caught on quickly after it was introduced in 1998. PSK relies on the computer soundcard to generate a warbling audio signal fed into the microphone or line in jack on the transceiver for transmission. The audio output from the transceiver is also fed to the soundcard. Computer software converts the received signal to letters and they trot across the screen about as fast as you can type.

PSK has several versions with PSK31 being the most popular. A PSK31 signal is only 31 Hz wide and because it is so narrow and the decoding software is so robust, PSK can operate at very low signal levels. PSK can decode a signal too weak to hear and barely seen on the waterfall display. Typically output power is limited to 25 watts or less. This makes PSK ideal for low power operations.

There are many free PSK programs available and they do not require a super-computer to operate. Some work with a tablet. The audio hookup from computer to radio does not have to be complicated although it is advisable to have some isolation to prevent ground loops and RF feedback. Check out the reviews for “Interfaces” on eHam.net or roll your own.

Here is a screen shot from WinWarbler which is part of the free DxLab Suite of software by AA6YQ, Dave. I have used DxLab for years and, without meaning to disparage any of the other programs, heartily endorse it. There’s more about logging and record keeping software in another chapter.

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