----- Original Message -----

From: Graham

To: [email protected]

Sent: Monday, October 15, 2007 7:08 PM

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

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 :-

 

http://f6cte.free.fr/index_anglais.htm

 

select :-

 

 

 MULTIPSK.ZIP (Multipsk + Clock)

 

 

Tnx

 

Graham

 

G0NBD

 

io83lk

 

 

 

 

 

 

 

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