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Ok Andy
Seeing a good signal from your beacon, game on
!.
Well ... if the reports are sent to the 5 meg
system , that may cause (more) confusion .... but there is a need to
produce some experimental data from the allocation, this may be more
'tangible' than the wspr reports .... as the beacon is running
, I will splash this in the usual news
groups , I will add a note asking for the log files to be retained
and not emailed to the 5 meg system !
Tnx- G ..
Nb the pulse width , 500uS ... that's a
bit sharp for a ssb filter , only 1.5 cycles at 3 Khz ...
?
Sent: Friday, March 06, 2009 3:56 PM
Subject: Re: LF: Multi-function beacon
Hi Graham -
I'm not bothered about log files myself as I don't have the time to
collate massses of data but if someone else feels they'd like to do it...
Haven't hought about how long it will go for, I may just forget about it
shoved up in the corner of the garage where, if it catches fire, all damage
will be contained, so happy enough running 24/7 for
now. The 5MHz monitoring system is in there as well.
As for your questions on the pulsed part of the wavefom; its not in
use on this transmission , I replaced it with a PSK31 message
instead. The original 5MHz system used a pulse width of 500us at a
PRF of 40Hz, with the idea of using an SSB reception bandwidth, so something
coul dbe done with SSB Tx, but these days we'd probably go another direction
with PSK and a PN sequence rather than a simple short pulse.
2009/3/6 Graham <[email protected]>
Ok Andy,
Obvious question, hi,
How long are you thinking of running
the beacon and where do you want the report files to
be sent ?
There may be quite a few records generated in a
short time, I note from the last 'hfc' that
there is quite a backlog of data from the 5 meg operation but
there is movement
to analyse the data. should prove
interesting ..
How aggressive is the pulsed section of the
tx cycle,?, I know there is some interest in using that facility for study's
on 500, but as yet I have not found the rise/fall and timing parameters.
dose it need to be a pulse or could a small frequency shift be
used if time is being measured ?
Tnx- G ..
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