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LF: Olivia data test ,to night 503.300 ~ 20:00 hrs local > midnight

To: <[email protected]>
Subject: LF: Olivia data test ,to night 503.300 ~ 20:00 hrs local > midnight
From: "Graham" <[email protected]>
Date: Mon, 15 Oct 2007 19:08:47 +0100
References: <002701c80f2d$c1087100$0964a8c0@gusham2mq8wmls>
Reply-to: [email protected]
Sender: [email protected]
Hi,all.
 
To date , not tried a multi tone data system .
 
The Olivia system , would seem to  print well into  the noise ..may out perform  psk31
 
The 'multipsk' software has a 250 x 8 tone setting  250 hz/bw  8 tone freq , I shall set the 'purple' center freq marker , to  503.3  dead (+/- few c/s) . the output spectrum looks quite clean , and should not spread .
 
There are wider versions , but 250  should be 'ok' --- If anyone is xtal fixed , plse let me know and i can qsy
 
>>>> Sorry to  those who 'know' , follows  notes on reception <<<<<<
 
As its possible , from observation at 'HF'  olivia will print from below the noise level , accuate rx seting may be neede , 
 
rx settings 'usb'   - dial frequency to  give recovered audio center frequency to  that of the transmission and software settings 
 
i.e.  The tx settings will be  -dial frequency - 502.000 Khz ,  mode usb .. software tx/rx tone , center frequency,  1,300 Hz , giving 503.3 'carrier'
 
The reverse applies for 'rx' dial  502 , usb ,  software , -purple mark- 1300 Hz
 
 using a narrow filter should not be needed as the soundcard/software will provide the slectivity, also narrow filtering may 'round' the pulses and reduce the s/n at the rx .
 
 
 
NB .. The new 'digital master 780' also supports the mode, but dosent appeare to  support the '250x8'  narrow version .. other packages may do.
 
Software can be downloaded from :-
 
 
select :-
 
 
 
 
Tnx
 
Graham
 
G0NBD
 
io83lk
 
 
 
 
 
 
 
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