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From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <000701cecb29$d06ee7f0$6401a8c0@JAYDELL> <C6FD126FE3284F95A6ED7213B3C0618B@White> <2A50C7B96485434983B3AFAD5AC1432F@AGB> <1382118806.496011265@f276.i.mail.ru>
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Date: Fri, 18 Oct 2013 19:08:32 +0100
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Subject: Re: LF: Re[2]: T/A OPDS DK7FC
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Ok Alex=20

Well  Op4   has a  set  limit  of  round  -30 dB  I have  seen  -33 =
using   the  dongle  sdr=20

OP4H ..  if the  window  was   over 2  hours , then , I suppose its =
possible ,   the  problem is  the  decoder  is  centred on  8 Khz  , so  =
 would  need  a  bfo  that  could  off  set  8K or  use  SL as a  =
frequency  translator ? for  Opera  decode =20

At  -50 dB  s/n its the  lowest decoding  data  mode  , add  another  =
bag of  -dB's  with  Markus's  system , you  could be the  first to  VK =
with a  full  decode  hihi=20

But   worth  setting  up  for  ?

73-G,=20


From: Alex R7NT=20
Sent: Friday, October 18, 2013 6:53 PM
To: rsgb_lf_group@blacksheep.org=20
Subject: LF: Re[2]: T/A OPDS DK7FC


Graham,

you wrote 18.10.2013, 20:23 MSK(GMT+4h):

>Both ROS Hf/Mf data modes and Opera , s/n measurements use the path-sim =
simulator as the calibration reference , which is higher than the levels =
>produced by fldigi / wspr etc , ie transmission needs less power to =
give the same db level=20

>May be Stefan could run OP4 on 136 at 100% duty cycle for one session , =
that would give the first 'real' qsb profile of the TA path with a delta =
T of 240 >seconds ?

>(but give some warning if it happens !)

>73-G,=20

>http://www.moetronix.com/ae4jy/pathsim.htm


I can give OP4H on 136, but is not sure that somebody will RX me on the =
other side of Atlantic now.
Besides, I need to TX at freq 136900 - 136925 (RX 136000 USB dial)
or I'm mistaken(?)

73! Alex R7NT 136.73.ru

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<HTML><HEAD>
<META content=3Dtext/html;charset=3Dutf-8 http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23532"></HEAD>
<BODY style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: =
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<DIV>Ok Alex </DIV>
<DIV>&nbsp;</DIV>
<DIV>Well&nbsp; Op4&nbsp;&nbsp; has a&nbsp; set&nbsp; limit&nbsp; =
of&nbsp;=20
round&nbsp; -30 dB&nbsp; I have&nbsp; seen&nbsp; -33 using&nbsp;&nbsp; =
the&nbsp;=20
dongle&nbsp; sdr </DIV>
<DIV>&nbsp;</DIV>
<DIV>OP4H ..&nbsp; if the&nbsp; window&nbsp; was&nbsp;&nbsp; over =
2&nbsp; hours=20
, then , I suppose its possible ,&nbsp;&nbsp; the&nbsp; problem is&nbsp; =

the&nbsp; decoder&nbsp; is&nbsp; centred on&nbsp; 8 Khz&nbsp; , =
so&nbsp;&nbsp;=20
would&nbsp; need&nbsp; a&nbsp; bfo&nbsp; that&nbsp; could&nbsp; =
off&nbsp;=20
set&nbsp; 8K or&nbsp; use&nbsp; SL as a&nbsp; frequency&nbsp; translator =
?=20
for&nbsp; Opera&nbsp; decode&nbsp; </DIV>
<DIV>&nbsp;</DIV>
<DIV>At&nbsp; -50 dB&nbsp; s/n its the&nbsp; lowest decoding&nbsp; =
data&nbsp;=20
mode&nbsp; , add&nbsp; another&nbsp; bag of &nbsp;-dB's&nbsp; with&nbsp; =

Markus's&nbsp; system , you&nbsp; could be the&nbsp; first to&nbsp; VK =
with=20
a&nbsp; full&nbsp; decode&nbsp; hihi </DIV>
<DIV>&nbsp;</DIV>
<DIV>But&nbsp;&nbsp; worth&nbsp; setting&nbsp; up&nbsp; for&nbsp; =
?</DIV>
<DIV>&nbsp;</DIV>
<DIV>73-G, </DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A title=3Dru6la@bk.ru=20
href=3D"mailto:ru6la@bk.ru">Alex R7NT</A> </DIV>
<DIV><B>Sent:</B> Friday, October 18, 2013 6:53 PM</DIV>
<DIV><B>To:</B> <A title=3Drsgb_lf_group@blacksheep.org=20
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
</DIV>
<DIV><B>Subject:</B> LF: Re[2]: T/A OPDS DK7FC</DIV></DIV></DIV>
<DIV><BR></DIV>
<P>Graham,</P>
<P>you wrote 18.10.2013, 20:23 MSK(GMT+4h):</P>
<P>&gt;Both ROS Hf/Mf data modes and Opera , s/n measurements use the =
path-sim=20
simulator as the calibration reference , which is higher than the levels =

&gt;produced by fldigi / wspr etc , ie transmission needs less power to =
give the=20
same db level <BR><BR>&gt;May be Stefan could run OP4 on 136 at 100% =
duty cycle=20
for one session , that would give the first 'real' qsb profile of the TA =
path=20
with a delta T of 240 &gt;seconds ?<BR><BR>&gt;(but give some warning if =
it=20
happens !)<BR><BR>&gt;73-G,=20
<BR><BR>&gt;http://www.moetronix.com/ae4jy/pathsim.htm</P>
<P><BR>I can give OP4H on 136, but is not sure that somebody will RX me =
on the=20
other side of Atlantic now.<BR>Besides, I need to TX at freq 136900 - =
136925 (RX=20
136000 USB dial)<BR>or I'm mistaken(?)</P>
<P>73! Alex R7NT 136.73.ru</P>
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