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LF: Come the New Year cometh a new data mode

To: <[email protected]>
Subject: LF: Come the New Year cometh a new data mode
From: "Graham" <[email protected]>
Date: Sun, 1 Jan 2012 23:35:35 -0000
Importance: Normal
Reply-to: [email protected]
Sender: [email protected]

Come the New Year cometh a new data mode

 

In a changing technical world, perhaps not being an expert allows you to ask questions that may not be considered technically elegant; such was the case ?..

 

Passing  by  unnoticed  on  30/12/2011  on 137.5  from  20:00  z   was a  set of  variable length  pulses  over a   8 minuet repeating  every  5  minuets, in essence  a  test  transmission of a  new data  mode , from Gary  G4WGT  with  the  intent  of  crossing  the  pond  to  Joe V01NA, using  a  transmitting station  that  could be  described as the standard  MK1  UK back  garden  VLF Array .

 

A  12  meter   end fed  vertical  with  a  contemporary 2 meter square  wire  capacity hat, fed  via  matching  transformer and  400 watt  class  d  amplifier .. ERP maximum? may be round  300mW , certainly  well  below the  1  W erp max .

 

Rain  had  reduced  the  safe  power level  to  some  200 watts  at the  start  of  the  tests  , decodes  from  UK where  achieved, but  as  the  monitoring  computer  Joe  VO1NA  uses  , is not  web linked , no  confirmation  could be expected  till  much later of a  decode  , or  use  made of the  internet chat  link?harsh  conditions  in a grabber  and   wspr world ..

 

With  a break in the  weather ,power was  increased  3dB to  400  watts round  22:00z , at this  point one of the  UK monitoring stations  closed  , leaving  myself  and it  was hoped  Joe , on frequency . notably  Joe?s  136  beacon was  not  running that  night ..the  only  good  sign  up till  then ?With  no  further  UK or  EU decodes other  than mine, the  test  ended  0020z 

 

Followed  one of those  silent  periods , with  no  web reporting , this  was  a real  vintage  attempt  using a  modern  system .

 

 

The  next day ... Possibly  not  totally  unexpected came  a email 

 

 

 

Hi Graham,

I hope the attached resukts in a smiley for you and Gary!

73 es tnx!
Joe

 

 

 

 

 

Using  the  new  OPERA data  mode  , Gary  had sent G4WGT  and  had  been decoded by VO1NA  six  times  in a  2  hour  time  window , at  a  signal  level  of  some  -30 dB using  a  TX period  of only   8 minuets  over  a distance  of  3500K  with  round  400 watts to  a  12mtr  vertical, defiantly  something  to  sing about !.

 

 

Definitely  one  for the  scrap  book !

 

73 - Graham

G0NBD

 

 

 

 

 

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