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Ok Alex
Well Op4 has a set limit of
round -30 dB I have seen -33 using the
dongle sdr
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
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
But worth setting up for ?
73-G,
Sent: Friday, October 18, 2013 6:53 PM
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
>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,
>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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