Data speeds are very
slow over HF radio and some satellite and mobile services.
To cope with
this slow speeds there are a number of email compression services and software,
compression helps speed up the throughput of data and reduces cost of satellite
Compression removes unwanted data, the level of compression
will depend on the data type. JPEG & GIF pictures are already compressed
and GRIB files are in a binary format and do not compress very well, plain text
messages compress a lot better.
Service providers like SailMail and
WinLink use a software package called Airmail 3.
The Airmail 3 software
offer many features:
- Email compression
- Send and receive email with attachments
- Request and download weather data and grib files
- GPS input for automatic position reporting via email
- Shadow mail allows you to monitor other POP3 email accounts.
tracking and reporting
- Built in radio propagation program
- Supports connectivity via Pactor modem, Internet or satellite
- Controls SSB transceiver including setting the station and
Airmail works with MS Windows XP, Vista and Windows 7 or 8.
Runing Airmail 3 under Ubuntu (Linux)
If you have Wine
) installed on a computer
running Ubuntu then there are very few problems using Airmail3!
Windows uses COM ports and Linux does not, so you have to map the USB port to a
Plug the USB modem into a USB port on your Ubuntu computer.
Note: Only works with PTC-IIusb modems, not the later Dragon P4
In terminal get a list of devices by typing ls
This will list all USB ports being used, if no other USB
being used then it should just list the one port /dev/ttyUSB0
move to the Wine dosdevices directory, type cd .wine/dosdevices
type sudo ln -s /dev/ttyUSB0 com1
You will then need to enter to
That is it, close terminal
Now in the Airmail3 software
under options select comm port COM1