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From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
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Date: Wed, 12 Sep 2007 00:19:42 +0100
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Subject: LF: GI4DPE & G0NBD  first  PSK  and longest data qso (yet) 
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GI4DPE & G0NBD  first  PSK  and longest data qso (yet) 

10/9  22:00 local 


G0NBD and GI4DPE , established communication ,  Using a mix of modes , 
psk31, qpsk31 and pskam10. Hampered by adverse noise and deep qsb , an 
exchange was achieved over a distance of some 170 miles. 


Technically the experiment spanned the development of radio 
communications, Finbar , achieving, the linear modulation of his 
mosfet  class c/d transmitter by amplitude modulation  of  PSK31 and 
QPSK31. Modifications where needed to enable the modulator to handle 
tones outside the normal speech band. To ensure minimum bandwidth  a 
frequency below 100 Hz  was used. 


On my part, linier transmission of  PSKAM10 was generated by use of a 
Racal MA1723 exciter audio fed to  the 600 ohm line feed , final 
amplification by  class A solidstate drive amplifier. 


A combination of 'Digipan' Psk software, unique in that it allows tone 
generation to 0 Hz and Multipsk, generating pskam10. was used for the 
test. Reception of the AM signal was facilitated by the selection of 
the 400 Hz  filter , reception of the full signal was necessary, due 
to  the low power contained in the sidebands 


Graham .