Tuesday, October 2, 2012

Airlink Express Digital Mode Software

Airlink Express is a user friendly digital mode software package for the Amateur Radio Operator. The software is compatible with Microsoft Windows XP, Microsoft Windows Vista, and Microsoft Windows 7. It offers PSK, MFSK and RTTY digital modes with logging and macro capabilities. If you have ever used the Digipan software you will be immediately familiar with Airlink Express.
With the release of Windows Vista and Windows 7, Microsoft introduced a new sound architecture. Airlink Express is developed to support this new sound architecture, yet it maintains complete backward compatibility with Windows XP. Airlink Express brings back the familiar volume slider interface you’ve become used to from older Windows versions.
The DSP engine used in Airlink Express is MMVari by Makoto Mori, JE3HHT. This engine is very flexible and decodes as well, if not better, than any other soundcard mode engine currently available. It is used by many other software products like Logger32 and the N1MM contest logger.
FEATURES
These are just some of the features available in Airlink Express:
Automatic Multi Channel Display with PSKReporter capability
Country, Continent, Distance and Bearing Information
PSK, QPSK, MFSK and RTTY
Radio Control (CAT)
Center Bandpass Tuning
True FSK Keying
Macros
Bandpass Filters
Logging with ADIF Import and Export
Replay Last 60, 30, or 15 Seconds
Error free sending and receiving text and binary files (using ARQ)

Airlink Home Page; Click here
http://www.airlinkexpress.org/index.html

Download version 2.5.2.732
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HOW TO READ PROPAGATION NUMBERS

The A index [ LOW is GOOD ]

  • 1 to 6 is BEST
  • 7 to 9 is OK
  • 11 or more is BAD

Represents the overall geomagnetic condition of the ionosphere ("Ap" if averaged from the Kp-Index) (an average of the eight 3-hour K-Indices) ('A' referring to amplitude) over a given 24 hour period, ranging (linearly) typically from 1-100 but theoretically up to 400.

A lower A-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Ap-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

SFI index [ HIGH is GOOD ]

  • 70 NOT GOOD
  • 80 GOOD
  • 90 BETTER
  • 100+ BEST

The measure of total radio emissions from the sun at 10.7cm (2800 MHz), on a scale of 60 (no sunspots) to 300, generally corresponding to the sunspot level, but being too low in energy to cause ionization, not related to the ionization level of the Ionosphere.

Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; Solar Flux rarely affects the 30, 40, 60, 80, & 160 Meter Bands.

K index [ LOW is GOOD ]

  • 0 or 1 is BEST
  • 2 is OK
  • 3 or more is BAD
  • 5 is VERY VERY BAD

The overall geomagnetic condition of the ionosphere ("Kp" if averaged over the planet) over the past 3 hours, measured by 13 magnetometers between 46 & 63 degrees of latitude, and ranging quasi-logarithmically from 0-9. Designed to detect solar particle radiation by its magnetic effect. A higher K-index generally means worse HF conditions.

A lower K-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Kp-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

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