The new robust pskmail server (0.9.29) is now ready for alpha testing. Together
with the jpskmail-0.4 client and fldigi-3.13BG it builds a system which is
extremely robust, and can be used under a broad range of band conditions.
What is new?
The server uses RSID technology to change modes. The client and server have
been changed to handle RSID in such a way that they work together efficiently.
Transmission modes are changed automatically depending on channel quality in
such a way that maximum speed is combined with optimum robustness. This is
achieved by a mode switcher which constantly monitors the link, and changes to
a more robust mode when the channel stalls, either because of qrm,qrn or qsb.
The server offers various mode profiles which can be set from the client. Each
profile has 3 modes, and the server will automatically switch between them, and
also adjust the block length by looking at the number of errors on the link.
The following 9 profiles are available:
9: PSK500 PSK500R PSKR125
8: PSK500 PSK250R PSKR125
7: PSK500 MFSK32 PSKR125
6: PSK500 THOR22 PSKR125
5: PSK250 PSK250R PSKR125
4: PSK500R MFSK32 PSKR125
3: PSK500R THOR22 PSKR125
2: PSK250R PSK125R PSKR125
1: MFSK32 MFSK16 PSKR125
0: Use server default
The client can choose the profile by setting the Blocklength variable through
the preferences dialog.
This mode table is preliminary, lot of testing will be needed to fix the most
effective combinations. The ones we use now are the ones I prefer :)
The server can be connected in any mode (PSKR125, THOR22, PSK500... etc.)
The new test software is available at
http://hermes.esrac.ele.tue.nl/pskmail/alpha
Fldigi and client packages are available for windows and linux.
At this moment only PI4TUE is running the new test server, but i hope there
will be more soon. Using the new server I can now work PI4TUE with 1 Watts (20
km, 18105 kHz), on 30 meters I need 10 Watts.
I hope some of you can do some tersting, and let me know of any quirks....
73,
Rein PA0R
