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Re: LF: It CW MAL , But not as most know it

To: <[email protected]>
Subject: Re: LF: It CW MAL , But not as most know it
From: "Graham" <[email protected]>
Date: Fri, 21 Mar 2014 13:59:39 -0000
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Its difficult Stefan , in this  case  its  a  engineering  beacon , that  measures  the   path in terms  of   average  signal  and  % fade  ,
the  s/n determines  the  max data  rate  the  link  will  support and  the  % fade , indicates the  interleaving   requirements  , interleaving  bridges the  qsb  'gaps'  but  , then  slows the  turn  round  time  .....  better  to have a good  level of  sensitivity  and  longer  interleave  on MF , as  the  time  to  send the  message  at 100%  error  free may  seem  longer  , but  , if  bits  are  missed  , then  time  is  lost  in re-tries  .same with  arq , repeats   slow the  transfer  down
 
Yes  its  exchanging  call   and  s/n reports , linked to the  psk-map  and  other  users  as a  complete system , that  also seems  to  meet the  minimum requirements   of  a  'qso' 
 
For a  live qso 
 
Version  1-4-1  supports   15  chrs  plain text  , and  sends  in 60  seconds   , using  single  tone  , which  can be  used  for  a   live  qso    ,   enough  to  exchange  info  like  ' I have a cat'  etc , but  it needs    round  -20 -23  dB s/n  to  decode  , which is  simple to  reach  on HF , reasonable  on MF  and  not  so easy  on 136
 
You  could  reach  levels  over  -20 into the  Uk etc , but  , the problem is  , how many  stations  do  you  see  at  over  -20  in rx  on 136 ?
 
 
Ros-mf-2   works  at  -24/25 dB s/n and  is  a full  free  running  data  mode  , mf-7  runs at the  same  speed  as  psk31  and is  about  10/12 dB lower s/n with  interleave  , and can be  used  upto  28 MHz  .. but  is  multi tone , so needs  additional  hardware 
 
The Opera  one4one  file  can be  downloaded  from  :  https://groups.yahoo.com/neo/groups/O_P_E_R_A_/files,  note , the  coded  frequency  is  500KHz , from the  time  it was  developed  ,   set 477  usb  now ! and there  is  no   136  allocation for  qso  ,if anyone   wants to  try  2 way  on 136  just  use  '500'k
 
73-G,
 
 
 

Sent: Wednesday, March 19, 2014 10:01 PM
Subject: Re: LF: It CW MAL , But not as most know it

...hmmm, and even like some CW QSOs heared on HF, just exchanging callsings and report via internet? Automated report and serial number via PC in 300 bpm, "5nn"?
Not really CW, isn't it?

73, Stefan/DK7FC

Am 19.03.2014 18:58, schrieb Graham:
It CW  MAL , But  not  as  most know it 
 
Opera  Op0.5      30 second  TX cycle    -20 dB s/n min decode
 
A Magic  mode  for the  Magic band   !
 
G, ))
 
 
ZR6MS IK1NET 6m OPERA 8148 km 17:16:40
IK1NET ZR6MS 6m OPERA 8148 km 16:56:24
ZR6MS EB5BQC 6m OPERA 7771 km 17:32:24
EB5BQC ZR6MS 6m OPERA 7771 km 17:36:59
 
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