ARLA/CLUSTER: Opera Beacons

[João Gonçalves Costa]

De: ct-comunicacoes-e-tecnologias  googlegroups.com [mailto:ct-comunicacoes-e-tecnologias  googlegroups.com] Em nome de Antonio Matias
Enviada: sexta-feira, 11 de Maio de 2012 16:07
Para: ct-comunicacoes-e-tecnologias  googlegroups.com
Assunto: [CT-Com. & Tec.] Opera Beacons

Desconhecia este novo modo de beacons.
Há um colega que procura "dadores"
Parece interessante, mas se é preciso um PC para descodificar, creio não haver grande vantagem contra o velhinho CW.


Retirado do forum dos 4m:

""""""Wanted !! Opera Beacon/qso testers

Opera is standalone digital mode , using SS data processing and ON/OFF single carrier keying. It is unique in that upto 50% of the transmission, randomly along the time time, may be lost , whilst still fully decoding.

The on/off keying thus enables 'any' Tx to be used , eg, ex-pmr , fm radios , ssb , or CW , PIC+DDS systems etc

The QSO mode allows upto 15 Chrs to be sent at a min decode level of -20 dB (s/n readings are based on average and display approx +6dB higher than wspr) and takes 120 seconds to tx.

The 30 second beacon version is provided to enable aircraft meteor propagation to be investigated , requiring 15 seconds of the TX for minimum decode

NO Internet time locking is required , web linking provides distance and other station info , but plays no part in the tx/rx

With the on set of summer, it could be a ideal time to add the Opera beacon to any CW beacon's , experimental or otherwise

Opera is now in wide spread use from experimental air&ground transmission on 8Khz, 136/500 Khz , HF up to VHF ,

The software has provision for direct CW keying of the Tx via the com-port, or direct audio drive, via ,ssb conversion, separate PTT and Key outputs are provide for station switching

A PIC code facility also provided to allow PIC tx control , encoding the station call sign.

Reception is via recovered audio from a conventional SSB receiver, to pc sound card as per other data modes.

The beacon is directly linked to the psk-reporting map. as well as to other users , sharing reports and tx announcements via the web

Encoded are the following frequency's , for normal use , all that is needed is the usb-dial set frequency , but for direct keying of a standalone beacon, then the carrier frequency, must be placed inside the bracketed qrg , to ensure the correct Rx pass band is addressed ,

OP1 70.090 usb dial QSO (7000912 700916)
OP1 Beacon (700916 7009200)
OP0.5 70.091 usb dial Beacon only (70.0926 / 70.093 )

If the station cannot directly be set via the CAT , then this must be disabled and the appropriate Opera qrg selected from the list, this in turn selects the correct mode

73 -Graham
G0NBD

Download site >> http://rosmodem.wordpress.com/2011/01/10/ros-2/

user group >> http://groups.yahoo.com/group/O_P_E_R_A_/?yguid=131323118

--
António Matias

CT1FFU - CR5A

www.dxpatrol.com<http://www.dxpatrol.com>

QRV: HF, 6m, 4m,2m,70cm,23cm
SSB, CW, MGM
DX, EME, Contest,Sat.

POBOX-38
2504-909
Caldas da Rainha
Portugal

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