From: "Roman RW3ADB" <rw3adb@rambler.ru>
To: "rsgb_lf_group" <rsgb_lf_group@blacksheep.org>
Date: Fri, 10 Aug 2012 21:50:34 +0400
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Subject: RE: Re: Re: LF: Beverage ant RX experiment
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TNX Graham, we are know abt OPERA.=0D
The team is planning to SWL in OPERA too.=0D
=0D
Roman,=0D
=0D
Opera Beacon , has two operating modes on 136 KHz OP8 and OP32 ,=0D
=0D
OP8 , tx time =3D 8 minutes , S/N =3D APP -34 dB s/n=0D
OP32 tx time =3D 32 minutes S/N =3D APP -39 dB s/n=0D
=0D
The system is free running and requires -NO- time locking . Tx may=0D
start at 'any' random time=0D
=0D
OP uses On/OFF (CW) keying , Tx may be by using the windows base=0D
software , with either SDR , audio drive or com-port (ptt type) PIC=0D
or other micro based system=0D
=0D
Rx is by the windows based software and may be via audio=0D
(conventional data mode's) or by SDR . due to the numeric data=0D
processing , a decode may be achieved with 'ANY' 50% (min) of the=0D
data , The decode process is based on ''Average''=0D
signal levels , advantage can be made of rapid qsb during each=0D
individual Tx pulse by integration , impulse noise is filtered by=0D
non-linear routines , numeric filtering facilitates pulse shape recovery=0D
=0D
NO pre-filtering is required , use of narrow filters , noise limiters=0D
etc will degrade decoder performance=0D
=0D
When using conventional SSB tx/rx the frequency is defined as ' Rx=0D
Dial set USB' , ie 136.00k , 500.000k and 477.000k..etc..=0D
=0D
This ensures the correct audio pass band is selected , when using=0D
the windows based software. each mode has a dedicated audio pass band ,=0D
(defined on the waterfall display by two red lines , marking the=0D
upper and lower boundary frequency , carriers 'must be inside limits=0D
=0D
If using 'VFO' tx control, the Rf carrier frequency range :-=0D
=0D
OP32 137.5 > 137.6 KHz=0D
=0D
OP8 137.6 > 137.7 KHz=0D
=0D
As the filter edges are quite steep it would be advisable to aim for=0D
a frequency mid-band to accommodate system tolerances ,=0D
=0D
Decode reports are distributed via the web or stored locally , but to=0D
save the local results , the copy spots or highlight and copy/paste=0D
is needed=0D
=0D
73 -Graham=0D
G0NBD=0D
=0D
=0D
=0D
--------------------------------------------------=0D
From: "Roman RW3ADB" <rw3adb@>=0D
Subject: RE: Re: LF: Beverage ant RX experiment=0D
=0D
>=0D
> Hello Stefan!=0D
> I'm trying to ask abt it RD4HU, but is not sure abt to get an answers.=0D
The=0D
> team is so busy to field day prepare I think.=0D
> The acty at night saturday to sunday 100% will be needed.=0D
> RD4HU and RA4HGN vy skilled op's and informed abt all modes, freq's and=0D
> OPERA.=0D
>=0D
> 73=0D
> Roman=0D
>=0D
> Hello Roman,=0D
>=0D
> Am 09.08.2012 00:05, schrieb Roman RW3ADB:=0D
>> Hi LF.=0D
>>=0D
>> RD4HU & Co planning to make an 136 kHz Beverage ant experiment in=0D
>> LO52hs at next weekend 10-11-12 avg.=0D
>> 2 km beverage ant will be installing into steppe area direct to the=0D
EU.=0D
>=0D
> OK, thanks for the information.=0D
>=0D
>> The action team requests to support the experiment by your=0D
> transmissions.=0D
>=0D
> You can count on me. Just tell me what mode and frequency you pre=0D