TNX Graham, we are know abt OPERA.

The team is planning to SWL in OPERA too.



Roman,



Opera Beacon , has two operating modes on 136 KHz OP8 and OP32 ,



OP8 , tx time = 8 minutes , S/N = APP -34 dB s/n

OP32 tx time = 32 minutes S/N = APP -39 dB s/n



The system is free running and requires -NO- time locking . Tx may

start at 'any' random time



OP uses On/OFF (CW) keying , Tx may be by using the windows base

software , with either SDR , audio drive or com-port (ptt type) PIC

or other micro based system



Rx is by the windows based software and may be via audio

(conventional data mode's) or by SDR . due to the numeric data

processing , a decode may be achieved with 'ANY' 50% (min) of the

data , The decode process is based on ''Average''

signal levels , advantage can be made of rapid qsb during each

individual Tx pulse by integration , impulse noise is filtered by

non-linear routines , numeric filtering facilitates pulse shape recovery



NO pre-filtering is required , use of narrow filters , noise limiters

etc will degrade decoder performance



When using conventional SSB tx/rx the frequency is defined as ' Rx

Dial set USB' , ie 136.00k , 500.000k and 477.000k..etc..



This ensures the correct audio pass band is selected , when using

the windows based software. each mode has a dedicated audio pass band ,

(defined on the waterfall display by two red lines , marking the

upper and lower boundary frequency , carriers 'must be inside limits



If using 'VFO' tx control, the Rf carrier frequency range :-



OP32 137.5 > 137.6 KHz



OP8 137.6 > 137.7 KHz



As the filter edges are quite steep it would be advisable to aim for

a frequency mid-band to accommodate system tolerances ,



Decode reports are distributed via the web or stored locally , but to

save the local results , the copy spots or highlight and copy/paste

is needed



73 -Graham

G0NBD







--------------------------------------------------

From: "Roman RW3ADB" <rw3adb@>

Subject: RE: Re: LF: Beverage ant RX experiment

Hello Stefan!

I'm trying to ask abt it RD4HU, but is not sure abt to get an answers.

The

team is so busy to field day prepare I think.

The acty at night saturday to sunday 100% will be needed.

RD4HU and RA4HGN vy skilled op's and informed abt all modes, freq's and

OPERA.

73

Roman

Hello Roman,

Am 09.08.2012 00:05, schrieb Roman RW3ADB:

Hi LF.

RD4HU & Co planning to make an 136 kHz Beverage ant experiment in

LO52hs at next weekend 10-11-12 avg.

2 km beverage ant will be installing into steppe area direct to the

EU.

OK, thanks for the information.

The action team requests to support the experiment by your

transmissions.

You can count on me. Just tell me what mode and frequency you pre