Message-ID: <265D812CEF8E4CAE925AAC01CD46E27E@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <5022E87B.2000307@iup.uni-heidelberg.de> <1344559435.214656.17682.36555@m.r0.ru>
In-Reply-To: <1344559435.214656.17682.36555@m.r0.ru>
Date: Fri, 10 Aug 2012 12:36:24 +0100
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Subject: Re: Re: LF: Beverage ant RX experiment
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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@rambler.ru>
Sent: Friday, August 10, 2012 1:43 AM
To: "rsgb_lf_group" <rsgb_lf_group@blacksheep.org>
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 prefer.
>
>> Some details you can find on the russian forum 136.su on russian
>> language:
>> http://136.su/forum/index.php?topic=128.msg4597#msg4597
>>
>> --
>> Roman RW3ADB.
>
> 73, Stefan/DK7FC
>