Hi
Graham,
Thank you for your
statement!
Well actually,
especially Scattergram or equal measurement methods would be of interest
regarding the aspect of signal path monitoring. (direct wave / sky wave via
cross correlation of pulse delay values).
However, the aspect
of interferences by using 500us pulses has to be taken into consideration but
may be there are coming up suitable solution by the LF-group.
Another method of
monitoring the signal path on 500 kHz could possibly performed by using the
?PSK Sounder? software from ZL2AFP. And what I saw on a first glance it should
be usable for transmission and reception in order to monitor the signal path
situation.
By the way:
Do you know if Andy
is continuing the Multi-function beaconing on 503.7
kHz?
In this case I would
try long term signal monitoring by GB3RAL.exe and PSK message decoding within
the next evening sessions.
vy 73 de Gerhard /
DK6NI
=============================
Andy's post about the new
beacon came out of the blue, (as is the signal hihi), Working on this,
I've simply added a page to the uk500khz news group and posted
links about to generate some interest and make sure the
beacon details are known to hams and swl's out side this reflector ..
The only thing that occurs
to me is that there is a possibility for reception reports to be
directed to the 5 meg group , I note that the graph generator by
G4IRX requests your call and locator before processing the file
and presenting you with a plot. so I will see if anything can be done to
prevent this , the data format is of course distorted by having only one
active beacon.. so it will show up .. but may as yet be unexpected
...!
I note from previous email that
the pulse aspect of the beacon is required for precise measurements, I
think that may be possible to set up a 'experiment' but the aspect of
interference to other users may be significant, Andy has referred to the
concept of 'phase reversal' in a continues carrier system (or medium pulse ?)
that would perhaps be a acceptable mode of modulation, weather it could be
transmitted by a 'normal' transmitter im note sure , but its worth noting that
activities on 500, to date are not 'funded' as such and time and capital
out lay are part of the 'hobby' and such hardware requirements and
software re-writes are beyond many of the active stations. but perhaps as
interest spreads .. things may change ..?
Sent: Sunday,
March 08, 2009 11:06 AM
Subject: LF: AW:
503.7 Multi-function beacon ... Its working
!
Hello Graham, Hello Andy,
reading about your activities
concerning Multi-function beacon I tried yesterday evening to catch your
signals, but unfortunately with no results copying your sig. May be condx were
not good enough. Moreover I had some bad manmade QRM from TV and
PC.
As
Rob Hemesley told you I am active in 5-MHz-beaco- monitoring specially
concerning scattergram monitoring in order to analyse signal path
situation (direct wave / sky wave behaviour).
But
I am running both analysis software, GB3RAL.exe and Scattergram.exe and it
would not be any problem to modify the internal PC-clock specially regarding
GB3RAL.exe in order to analyse the long term signal level of your
Multi-function beacon. So I will try to continue monitoring your
Multi-function beacon hopefully that condx will be better in the next evening
sessions (hi).
If
there will be Scattergram acties in future I certainly need some more dB
signal level, but it would be very interesting to investigate the signal path
situation.
Of
course, this is more interesting for those participants who are located in a
distance range between 150 and 300 km in order to monitor the slide crossover
from direct wave to sky wave signal path.
However, thank you very much for implementation of
your very interesting Multi-function beacon project and I will keep on running
my monitoring activities and will inform you in any case about further
results.
vy 73 and a lot of success by
running Multi-function beacons, I will be ?on the qui vive?
!!!
de Gerhard /
DK6NI (JN59LN)
By the way:
Dial frequency 505.2 kHz, is that
o.k.? (because GB3RAL.exe is decoding with 1500 Hz
too).
For BPSK31-decoding I am using
DigiPan Vers.2.0
================================
So far so good .. quite a step up
in signal round 2100 hrs
no frequency decode before then ,
15 db over noise at 2130
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19:17:00
