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Re: LF: Looking for 73 kHz band modes to try...

To: <[email protected]>
Subject: Re: LF: Looking for 73 kHz band modes to try...
From: "Graham" <[email protected]>
Date: Thu, 5 Dec 2013 19:53:43 -0000
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Bob,
 
Opera  has   73.00  Khz  USB     pre set for  CAT  set ups  and  linked  to the  psk-reporter , showing as  4000  meter  band , 64  was added  for  73 band with  -3 dB lower  decode  limit ,  taking  advantage of the  longer qsb , there  is more  'time'  = better  s/n ,
 
The  cycle  time  is the  same as  the  qrss  call  sign , in a  1 hour  window , run as is for  now ?, stations will  need to  tune the  73K settings
 
73 -G,

From: Bob Raide
Sent: Thursday, December 05, 2013 7:13 PM
Subject: RE: LF: Looking for 73 kHz band modes to try...

G, et all;
I would like to try OPDS32 and see what happens.  I don't see OP32 available for 73 band but am sure it could be[?] 
Maybe that might get the maximum number of receive stations participating???
Bob
 

From: [email protected]
To: [email protected]
Date: Thu, 5 Dec 2013 18:28:17 +0000
Subject: Re: LF: Looking for 73 kHz band modes to try...

Big  problem  is the  s/n Bob ,
 
 qrss   and Op64  are  in  the   -43   may be  -49 dB   s/n  with the  op-wspr correction  ,
Op64 is a  true  data  mode  , your  going  need  to  be  a good  + 20 +  25 dB  stronger  for  any  other data mode to  decode , this side of the  pond , the Opera  coding  offers  , a 3 way  decode   split ,
 
If  you get a  couple  of OP64 runs  and  'local'  decodes  ,  the  s/n  levels  will  give a  good  indication as  to  what  the  path  will  support , the  s/n level  is the  average  along  the  time  line ,  I think the  ros-mf-2  data  mode  at  -24 -27   dB  , about the  same as  wspr-2  is the  lowest  s/n   keyboard  -  keyboard data  mode   , next  up  mfsk  , but  you  need  3K  b/w  
 
The  only  other  system  is  'Wolf'  , that's a  linear  psk  mode , which I think will  go  via your  valve  tx , there  are a  few on here  that  will  remember how to  use  it    ..
 
Other  than  that ?  any  one  ?
 
73 -G,

From: Bob Raide
Sent: Thursday, December 05, 2013 5:55 PM
Subject: LF: Looking for 73 kHz band modes to try...

Any comments regarding different modes to try would be appreciated. 
QRSS60 has done well but time to move on with one or a couple digi modes might be worth trying-Bob, WG2XRS/4 NY
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