From Darpa:
Polarization modulation introduces an additional dimension. A
radio with four polarization possibilities
would transmit four times the information with all other aspects of the
waveform
held constant.
PSKmail
http://pskmail.wikispaces.com/
has quite a few features
http://pskmail.wikispaces.com/features
including Evolution mail client support, a chat mode and APRS inter-operability.
It is also free under the GPL.nbsp; It does not require an Internet connection
to function.
Robert KB5UPA
