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Ok Minto
Ah the full story 'wmr was
I was monitoring tween sdr and his signal
started , so I had to open the Opera
software , switch on the ft897 .. change the
Ae and set 477 op4 ..
so I must of just recorded just over
50 % , as the s/n is average , then the
signal will show lower
But the Op system gives the s/n in 2.4
KHz pass band , I think at that time
local noise was very high ... which reduces
the final s/n level
Yes skip range changes quickly
so its possible that was also lowering
the signal
rtty is ok for a local chat , from
multipsk rtty is listed as -5 dB
s/n , the only modes that really work are
the mfsk based ones , but these need
audio to rf translation , other
problem is the interleave time , qsb on MF is much longer
than HF , where most of the modes are profiled for
....packet would be the best , may be
we can get Stefan to act as the mid-eu node
: )
73-Graham
G0NBD
Sent: Tuesday, March 05, 2013 10:04 AM
Subject: LF: Re: RTTY tonight.
Graham,
Well it has been an interesting experiment, including
writing the RTTY software for the PIC. But I do not think that RTTY will ever be
one of the most used modes on 472. Although DSP software (like fldigi) can do
magic in decoding even barely audible RTTY signals it is probably too much hit
and miss on 472.
My OP4 being only 2 dB down on pa0wmr’s signal is a big surprise.
Pa0wmr has a big antenna (I remember something like a 40 x 40 mtr loop, 10
meters high all above water!!) and he is at least 15 dB stronger than me on
Twente Web SDR (about the same distance from Twente). There is just more than an
hour time difference between the decodes, but could propagation explain 15+
dB?
Minto pa3bca
--------------------------------------------------------------------------
Ceterum
censeo Carthaginem delendam esse
Sent: Monday, March 04, 2013 23:34
Subject: Re: LF: Re: RTTY tonight.
Yes these beacons are deceptive .......but
ros-mf-2 would print at that
level , needs sdr or audio/rf
translation
well |Ae hr is at the
moment end fed 40 ft vert , 2 inch
alloy tube , noise level is low (
local something = off ) only using the ft897
, but I can see beacon traces ,LF of the
Opera qrg , so its not that bad
22:08 477 PA3BCA Op4 -29 dB
20:50 477 PA0WMR Op4 -27 dB
Its really down to luck and skip as to
making long range qso on 500 , the skip
range changes , so you can have a qso in
the window , before it moves on
tween sdr just now
TTTSULDMCLKSMDCLKYMDCLSMDCK,$:(22'''8'98'$398'23$98'4$:98'98'$298$'2398$'2389$$2938':$$$,:,'$''$'$'$':'
;646'646
PEBCA JO21;10 VA3BCA PIC&AD9850DDS&0.1W ERP PLS RPRT
RSGB
LF-GROUP
QQ
G..
Sent: Monday, March 04, 2013 10:21 PM
Subject: LF: Re: RTTY tonight.
Ouch!
No RTTY qso with you then on 478 :-)
My antenna is real c**p
On the other hand... I did have several CW QSO’s with EI0CF and SM6BGP so
at least something is possible.
THEY however have impressive antenna’s.....
73’s Minto pa3bca
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Ceterum
censeo Carthaginem delendam esse
Sent: Monday, March 04, 2013 23:11
Subject: Re: LF: RE: Re: RTTY tonight.
22:08 477 PA3BCA de G0NBD Op4 -29 dB in Wallasey
Minto , that's + 1 dB from the bottom !
73-G..
Sent: Monday, March 04, 2013 9:56 PM
Subject: Re: LF: RE: Re: RTTY tonight.
Hi Marco,
Thanks for the report.
73’s Minto pa3bca
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Ceterum
censeo Carthaginem delendam esse
Sent: Monday, March 04, 2013 22:43
Subject: LF: RE: Re: RTTY tonight.
Hello
Minto,
some
partial copy here:
PICJLWS &850/$!'4?.1W ERP PLS RPRT YSGD-
35 T
PA3BCA
vy73
Marco,
DD7PC
Might have been me...
I can however decode my own signal via Twente WebSDR.
As for rtty settings:
My PIC program now uses: SendRTTY(478160, 50, 85);
So space freq = 478160, 50 baud, shift 85 Hz so mark freq is 478160+85 =
478245
Minto pa3bca
--------------------------------------------------------------------------
Ceterum
censeo Carthaginem delendam esse
Sent: Monday, March 04, 2013 22:13
Subject: Re: LF: RTTY tonight.
One low level rtty signal monitored
at tween-sdr , but not able to attempt
decdoe
What was the final shift/baud
rate + qrg ( mid tone ? Mark
qrg ? dial set usb + audio tone , audio
tone mid band , audio tone Mark ? channel mid
qrg )
or just set wspr-2 and retire
to pub ?
G.
Sent: Monday, March 04, 2013 7:43 PM
Subject: Re: LF: RTTY tonight.
FB Stefan On 04/03/2013 13:54, Stefan Schäfer wrote:
Eddie,
I just installed the program. Works. Of course it
works, it is a Windows version! ;-)
I thought of you when I
read this in a mailing I received earlier.
We make do with Windows, but it isn't perfect. In
fact, Windows computers can be extremely annoying. They're full of all sorts
of annoying features that just get in our way and slow us down, distracting
us from getting work done or doing whatever else we want to do. We'll help
you disable some of the worst Windows annoyances. My
sentiments entirely and one day it has to go to be replaced by something
modern. Just mentioned in passing no debates please. :-)
Now, are you prepared to listen for me? This evening i would
like to make a QSO, if this is possible. However the data rate is quite high
so i assume you need a relative high power to keep the error rate
low.
Yes I will listen for you no problem, let me know on here
when you want to try. Yes the data bits do not stay long in the same place so
it is for you QRO guys or short distance and medium distance with lifts for
the QRP'rs.
Which baud rate and frequency shift is recommended and which
frequency?
Follow Gary and be compatible seems sensible, Baud
rate used is 50 shift 85 Hz QRG 478.200KHz set you baud rate and shift in Menu
- MODE - RTTY - Opions at the bottom of the list. I look forward to
seeing you sigs. 73 Eddie
73,
Stefan/DK7FC
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