Re: LF: If anyones about , MT63 x 500 Hz and Olivia 500 x 8 >MODE CHANGE<2100 hrs>

[Piotr Młynarski <sq7mpj@toya.net.pl>]

Graham wrote:

> Mode change
>
> > From the initial reports it looks like the MT63 system is not as 
> > robust at 
> the olivia 500 x 8
>
> I will  change the MT63  mode to  MFSK16  , at  1000 Hz audio cent , ( 
> 502 Khz  rf cent )
> As mfsk will pass via a non linear system , this may be of wider interest
>
> Change time  >>> 2100 Hrs gmt <<<<
Dear Graham, LF  Group
i do not remeber if  there was a test performed  on 500 kHz  using 
another  multi-tone FSK  transmission
namely, THROB  - it is available in multipsk package of digi-modes. i 
think it should be superior to mfsk16
at  MF  especially when using lower rates 1 or 2  pulses per second  .in 
such case the bandwidth is 72 Hz
prabably it is still too  'fast'  but if the  speed of pulses (throbes)  
would be lowered it could  be  another managable mode on LF/MF
unfortunately , your test transmissions using different digi modes is 
still too 'local' for me ..   but Jim,, MBU, JOhn, SLV might come
out with positive decoding  - so i look at the new e-mails .... :)
                                                                                                        
73, peter, sq7mpj
qth: lodz, poland /jo91rs/