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
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.0.237 / Virus Database: 270.11.9/1988 - Release Date: 03/06/09
19:17:00
