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Re: LF: VO1NA Op8 Last Night

To: <[email protected]>
Subject: Re: LF: VO1NA Op8 Last Night
From: "Graham" <[email protected]>
Date: Sun, 15 Feb 2015 17:01:28 -0000
Importance: Normal
In-reply-to: <FD29AB77128543198510573B1D73A18F@IBM7FFA209F07C>
References: <FD29AB77128543198510573B1D73A18F@IBM7FFA209F07C>
Reply-to: [email protected]
Sender: [email protected]
Hi Chris
 
There  is not  very much  too  it ,  its evolved  over the years ,  the  latest  is a  beacon  only  version,  with the  dynamic  option  supplied  on 136  and  477k  only ,  all  other  bands  remain  as  opera  data  mode ,  should  the   data  decoder  fail  on  136/477  , then  a  secondary  correlation  detector  provides  additional   -5/-6 dB sensitivity . The switching  point  OP8  is  round  -33 dB  depending  on local  conditions .
 
Being  dynamic , without  the  web-link ,  the  call  sign  list   are  not  maintained  ,[ populated by  local decodes x 2  the same  call ?]  and  the  web-distributed  spots  which  are  'validated'   by  the  system  are  not  available ,   all  spots  are  uploaded to the  psk-map ,, so  caution  must  be  used when  deciding  , if a  dynamic  spot  is  real  or  false ,  approximate  times  are  + 1 min  for   477  and  + 4 mins  for  136  compared  to  data  decodes. in normal  use the  system  validates  the  spots , 
 
Use wise , 
 
Rx  is  as  per  any  other  data  mode ,   audio  via  sound  card  , the  cat linked  qrg's   set  USB ,   but  the  system  works  inverted  if  need  be  , s/n is  calibrated  , average  in 2.4 khz  b/w . use ssb  filter ,  narrow  filters  will  degrade  the  performance
 
Tx ,   either  by  audio  drive  to  ssb  Tx   [ 1500  Hz]   or  via the  com-port  CW keying  output  ,  for  a  CW   tx  , set qrg  to  mid  band ,  replace  cw  key  with  a realy  or  tr switch  , when  using  audio  drive ,  ensure the  ALC is  not engaged  , or the  out  put  will  have a  spike on the  leading  edge ,  the  fast  hf  modes  are  less  of  a  problem ,  due to  tx  rate 
 
Cat  control  tx/rx  for  most   set ups  is  provided  as  well as  Transvertor   off  set is   in the  application , to  correct  band  display etc  ,   any  outstanding  problems, let me know  and   should be  able to  resolve them , 
 
73-Graham
G0NBD
 
 
 
 

From: Chris
Sent: Sunday, February 15, 2015 10:20 AM
Subject: LF: VO1NA Op8 Last Night

Copied VO1NA on 477kHz Op8 several times last night between 0014 and 0447 UTC, rprt ranging from -27db to -32db.
Over last couple of days, apart from several UK stations, also copied F6CNI, SO5AS, PA3ABK, IZ7SLZ and SV8CS.
I am surprised at what can be copied considering the local QRM.
Can anyone tell me where the operating instructions can be found for EA5HVK's Opera v1.5.7. please? I have been searching, but can't find it. The 'Help' doesn't actually appear to be very helpful in this respect. This is not a criticism, probably just me not looking in the right place.
Thanks.
Vy 73,
Chris, G4AYT, JO01MI.
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