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Geri
The Opera mode , transmits only a
single on/off carrier , the same as CW
or QRS, the TX is a serial data
stream.
Tx can be via the windows based software .,
with com-port CW drive , Audio as in
say psk31 etc or by SDR
PIC code is available to enable a
PIC based keying system , the PIC would
be Beacon - only , the software also has the
QSO mode , where 'any' 15 chrs can be sent
at each tx
RX , is 'only' possible using the windows
software , and can be audio from
soundcard , or by SDR
The RX , has 2 audio bands
, one for each mode , each 200 Hz wide
, multi / simultaneous decodes are possible
in each mode , within the 200 Hz pass band
QSO 1200 / 1600 Hz
Becn 1600 / 1800 Hz
So , for VFO control of the TX , then
the carrier must be placed to fall
inside the required pass band , as the system uses
'usb''dial' as the definition of the 'qrg'
then for beacon mode , 1601 to
1799 Hz would need to be added (better not at the band edges
for tolerance may drop signal out the pass band) ,
normally say 1700 Hz would place you in
the centre of the pass band
If the Audio drive from the software is
used , then the carrier frequency will be
placed inside the relative pass band , by
checking for the best s/n 'spot' , this is
completed by the Rx routine , prior to Tx and takes a
snap-shot , main function to reduce collisions and avoid carriers
etc
So .......... If used by VFO , then the
system is sopt frequency , 2.5 Hz b/w .
............If the carrier placement / audio
tx drive is used, then the maximum allocated
B/W needed is 200 Hz for each
mode , with maximum Tx qrg
of + 1800 Hz from the dial-set - usb
73 -G.
Sent: Saturday, June 16, 2012 12:44 PM
Subject: Re: LF: RE: New Opera QRG for 472 Khz Band
??
What are the actual frequencies that are then
occupied by OPERA? As long as it is guaranteed that it's all below 2000 Hz above
the dial frequency, 477 sounds like a good plan as a start.
73
Geri, DK8KW & DI2BO
----- Original Message -----
Sent: Saturday, June 16, 2012 1:32
PM
Subject: Re: LF: RE: New Opera QRG for
472 Khz Band ??
Up to now , 477 is the only frequency on offer
?
G.
Sent: Friday, June 15, 2012 2:36 PM
Subject: Re: LF: RE: New Opera QRG for 472 Khz Band
??
I'd go with that Albert.
73 es GL Pete M0FMT IO91UX
G, Just to start
the discussion, my proposal is dial 477 kHz. 73,
Albert
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