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Well,
before sending you any reliable data, I would like to be sure that the QSB is
not an artefact coming from my rig.
I'm
presently using an ICOM IC738 as receiver and ARGO (by I2PHD/IK1as processing
software.
The
IC-738 has its own AGC working with a 400 Hz IF bandpass and ARGO has
also its own software AGC which don't know exactly what the algorithm
is.
So one can imagine that some other spurious signals
close to 440,044 kHz (aero beacons or local QRM/QRN) could maybe affect the DI2AG S/N ratio on the
ARGO displays.
What I propose is just to send you a few ARGO snapshots
(150 ko each) tonite just to show you the QSB I'm talking
about.
Within the next few days, I plan to record
automatically some audio files at some specific times (midday, midnight,
sunrise, sunset)
Storing audio raw data will allow me to play and replay
and rereplay the samples with powerful FFT tools such as Spectrum
Lab.
73
Jean-Louis
Dear Jean-Louis,
thank you very much for your interesting report. No, I havn`t got a statement
like yours derived from such an amount of screenshots. I think, another
OM made a remark like yours after obsering the beacon for a while. What do you
think: Is it possible to reduce the amount of data reasonably and then
transfer to me? [email protected] (
My box has only 10MB ).
73 Walter
Walter et
al.
I recorded your
DI2AG sigs last night from 6 PM to 6 AM .
A quick exam on
the 150 ARGO snapshots during my tea time early this morning tend
to show a deep QSB (period around 1 minute).
Have you got
other similar remarks ?
73
Jean-Louis
F6AGR
Loc. JN18DQ,
near Paris
----- Original Message -----
Sent: Sunday, January 02, 2005 5:07
PM
Subject: LF: DI2AG 440KHz
Dear All,
at
first happy new year to you.
And thank you very much for the response on
my beacon testing. I got 27 mails - partly with screenshots - until now.
Hope, the capacity of my harddisc will be sufficient ;-)
The mails came from G, LA, ON, F, DL.
Tonight the beacon will operate QRSS10. Now [email protected] is ready for
use.
This morning I had some trouble in reading
the mails from my account. While transfering the data the computer often
stopped and the program crashed. No help? Yes, after searching for more
than half an hour with my son I reduced the output of the 440KHz - that
it was!
Keep in mind: Either 440KHz or computer,
but not both;-)
Please dear friends give me your locator
when reporting, it`s easier to calculate the distancies.
73
Walter
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