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Re: confirmation of logic failure, AO-7



Hello once again,
-just finished on orbit 26.549 ,AOS 08.00 LOS 08.22.50 Lt -4.00 Z
AO-7 beacon was 145.973 +- Doppler of 3, no other beacon was on, readable.
On the ascending node, up to 68 deg of elevation, signal between minimum 539
to 589 20 wpm CW, tone and frequency stable signal.Checked several times for
birdies on the passband, nothing heard, repeat 435.1 and 29.5 beacons are off.
On the descending node, starting at 37 deg elevation, down south AO-7 started
chirping heavy. At 30 deg. suddenly the signal recovered stability and increased
signal power until aprox 24 deg elevation.From 24 deg to Los signal strength
started
to change down and chirped continuously.
Power supply issue......?

73 de Nick - PP8DA
n.sallay@horizon.com.br

----- Original Message -----
From: "Nicolaus Sallay" <n.sallay@horizon.com.br>
To: <on7vq@on4cp.org>; "Larry Kayser" <kayser@sympatico.ca>
Cc: <Jim.Walls@sce.com>; "amsat-bb" <amsat-bb@AMSAT.Org>
Sent: Friday, July 12, 2002 7:36 AM
Subject: Re: [amsat-bb] confirmation of logic failure, AO-7


> Hello to All;
> - Referering to Freddy's observation, please see my message from yeasterday,
> regarding
> the 2 meter beacon behavior on orbit #26537 with the "tone frequency
> shifting" up and down.
> Let me try to expain, In my observation, if you do not tune for "tone
> correction", the "correct
> tone" will return to the expected spot.Further I observed that this behavior
> happened on the
> ascending node util aprox. 20 deg elevation, from 20 up to the max, if I
> remember well 45 deg.
> the anomaly ceased and I had a 589 20 wpm cw transmission. Mode B was fully
> operational
> and a test transmission gave me a fb return.No beacon birdies have been fond
> in the 2 meter
> passband. 29.500 and 435.1 beacons off.The "tone frequency"maintained a
> stable condition
> until 30- 20 deg in the descending node and started to detune again and
> loose signal power.
> Trying to understand the above situation, I can only understand, that it
> must be power related.
> My question is, I'm located 3 deg South,60 deg. West, Manaus Brasil, how
> much Sun Illumi-
> nation do the solar cells get in  a equatorial area comparing to the
> Northern/ Southern Hemisfere,
> daytime condition naturally.I found a telemetry decoder program by Tim K3TZ
> and will try to
> find out what is happening in this particular matter.In almost two weeks of
> observation, I always
> met with well defined operating modes, A or B, or, sorry nothing on or
> readeble.
> As far I found out the eclipse areas are around the poles, North or South.I
> am using Nova for
> Windows as a tracking aid and I will try do do some simulations for better
> understanding of the
> eclipses and illumination amount.
> That is what I have from tis end.
>
> 73 de Nick PP8DA
> n.sallay@horizon.com.br
>
> ----- Original Message -----
> From: "Freddy VAN INGELGOM" <freddy.vaningelgom@pandora.be>
> To: "Larry Kayser" <kayser@sympatico.ca>
> Cc: <Jim.Walls@sce.com>; <amsat-bb@AMSAT.Org>
> Sent: Thursday, July 11, 2002 6:41 PM
> Subject: Re: [amsat-bb] confirmation of logic failure, AO-7
>
>
> > Larry Kayser wrote:
> >
> > > >Jim:
> > >
> > > I am choosing to divide your email up into four sections.
> > >
>
> ----------------------------------------------------------------------------
> -------------
> Message from Freddy ON7VG:
>
> > Abouth AO-7:
> > I just followed a pass above Europe (my location is near Brussels), and I
> noticed
> > something strange:
> > doppler shift on the 2 m beacon is, normaly, approx. 3 khz (on both sides
> of
> > nom. freq. of course). The beacon had a verry rough
> > tone this evening, and doppler seemed to be 5 or 6 Khz!!!! Only at the end
> of the
> > pass (and until AO-7 was
> > more than 5 deg after the horizon), I could here the 10m beacon, but at
> that time
> > there was no signal left on 2 meter.
> > I did not follow the passband, to see if there where signals
> > passing on mode A or mode B. But I tried once and noticed the same "rough
> tone"
> > beacon at 145.854.
> > The orbit number was (1)26541.
> > What could be this strange "drift" in the freq. of the 2meter beacon (was
> it the 2
> > meter beacon anyway?)
> > Someone out there had the same experience?
> > I look forward to learn from your experience!
> > 73
> > Freddy, ON7VQ
> >
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
>


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