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Things that go bump (beep) in the night
Changing from OP8 to OP4
would mean changing the software to
the 470 band at the Rx and Tx
But Alex is suggesting the Op4Hour ,
audio band mode , that needs a higher
stability than 32/64 , but with a locked
136 system should not be a problem ,
that would make a 4 hour data file to
post process !
Stefan ran a op4 over night on 477 last
year and made a good plot of the path to
Shetland 800 miles , with a significant
drop early morning,
at -30/-33 he should decode during
the TA window , all in the call of science
and N number of decodes , where N=
Big number )
73 -G,
Sent: Friday, October 18, 2013 7:17 PM
Subject: Re: LF: Re[2]: T/A OPDS DK7FC
Hi Graham, Alex,
I'm not sure if I'd be happy about a strong
signal, like that from Stefan, being hard-keyed once a second throughout
the night... In any case, as far as I know, there are a few
LF receivers set up for Op-8, but none for Op-4 so
far.
In my opinion, if we are really interested in
quantitative propagation and fading patterns, plotting utility stations like
DCF39 or HGA22 is the way to go. Just my 0.5 Renminbi's
worth...
Best 73,
Markus (DF6NM)
Sent: Friday, October 18, 2013 7:53 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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