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CX2SA > SATDIG 11.05.08 21:59l 297 Lines 9990 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V3 238
Path: IZ3LSV<IQ0LT<IK2XDE<DB0RES<ON0AR<HS1LMV<CX2SA
Sent: 080511/2001Z @:CX2SA.LAV.URY.SA #:2243 [Minas] FBB7.00e $:2243_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: AO-16 ON in voice mode 10May08 1020utc (George Henry)
2. AO-7 tlm. (John Hackett)
3. Re: ARISS Quiet 5/11/2008 0629 Z (Robert A. Netzband)
4. P3E Microwave Frequencies (Stan)
5. Re: Delfi Not Heard (D R Mynatt)
----------------------------------------------------------------------
Message: 1
Date: Sun, 11 May 2008 12:27:23 -0500
From: "George Henry" <ka3hsw(AT)earthlink.net>
Subject: [amsat-bb] Re: AO-16 ON in voice mode 10May08 1020utc
To: "amsat bb" <amsat-bb(AT)amsat.org>
Message-ID: <006a01c8b38c$46d1b140$0400a8c0(AT)parents>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Many thanks to Mark for making AO-16 available during the K9BSA Scout-O-Rama
demonstration yesterday, and MANY, MANY thanks for "advertising" that our
station was there on the 1950Z pass... we worked quite a number of
stations, thanks in large part to Mark's announcement on the bird. AO-7 and
VO-52 also provided many contacts earlier in the day.
OTOH, I was embarassed for the Scouts to witness the behavior on AO-27....
you know the kind I'm talking about.
73,
George, KA3HSW
----- Original Message -----
From: "Mark L. Hammond" <n8mh(AT)embarqmail.com>
To: <amsat-bb(AT)AMSAT.Org>
Sent: Saturday, May 10, 2008 6:29 AM
Subject: [amsat-bb] AO-16 ON in voice mode 10May08 1020utc
> Hello All,
>
> This morning I turned AO-16 ON in voice mode around 1020utc. The output
> power is reduced a bit and is reported as 700 mW by the telemetry.
>
> It is possible that it will cease transmitting; any reports that help
> narrow down an approximate time for such an event will be helpful. Also,
> reports of its continued operation will also be appreciated.
>
> If you hear AO-16 in voice mode, free to use it. If you hear it
> "hummmming" in digital mode, please do not transmit to the satellite.
>
> AO-16 Uplink: 145.920 MHz FM
> AO-16 Downlink: 437.0260 MHz DSB (LSB and USB)
>
>
> On behalf of the command team,
>
> Mark L. Hammond [N8MH]
------------------------------
Message: 2
Date: Sun, 11 May 2008 08:28:56 +0200
From: John Hackett <archie.hackett(AT)hotmail.com>
Subject: [amsat-bb] AO-7 tlm.
To: "Eu-amsat(AT)yahoogroups.com" <eu-amsat(AT)yahoogroups.com>
Cc: amsat-bb(AT)amsat.org
Message-ID: <BLU138-W52F4E01CE42E20A260A49C91CD0(AT)phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Apologies folks, forgot to sign the following 'parable' - so you wouldn't have
known who to blame.
Crikey, my 'periodic Altzheimers' is accellerating ...
73 John. <la2qaa(AT)amsat.org>
..............................................................................
............
Ron,
(and any other interested parties) ... Be aware that 98% of the AO-7
tlm is rubbish. The satellite is has been sending incorrect frames for several
years. You can check this yourself by monitoring the 6D parameters.
They should be either 649, 650 or 651. If they are not, the tlm is incorrect.
It has to do (mainly, but not only) with the power budget ... this is why it
is imperative certain 'clowns' stop hitting it with too much power. It is
essentially a QRP satellite and the 'gentleman' who proclaimed one needed an
80w BRICK, last year on this reflector. is wrong, wrong, wrong.
The following is a recent e-mail to me from Jan King, AO-7's project manager.
(I maintain a rather large database regarding this satellite and have just
about all the information available on AO-7 in several maps).
A *LOT* of information is contained on/from The AO-7 Resource Page if one
cares to follow the links.
EU-Amsat (c/o SV1BSX) maintains the distance records for AO-7.
The foll0wing is an e-mail from Jan.
73 John. <la2qaa(AT)amsat.org>
..............................................................................
...................
John.
Telemetry received may be good or bad. You can determine if the telemetry is
good by the 6D value. It is the reference voltage for the analog TLM system
and it should be around 50. If not, then the remainder of the telemetry will
be incorrect.
(clip) Jan King, W3GEY notes that AO-7 had (has?) a very sensitive receiver
and a good uplink antenna. 5 watts EIRP should provide a good downlink (clip).
Amplifiers are not required for the uplink. Excessive uplink power may be
cause FMing of the transponder and may be causing the input voltage to the
regulator that provides 6D to fluctuate causing all telemetry to be bad. AO-7
is almost certainly running only off the solar panels. It is very likely to be
on only when in the sun and off in eclipse. Since it is resetting each orbit
it may not come on every time. Reports of hearing the beacon just as it comes
out of eclipse would be particularly interesting.
1. Speculation that long term chemical changes in one or more battery cells
have led to increased cell resistance enabling the spacecraft to operate while
in sunlight are correct and
2. Reports indicating that beacons, telemetry systems, and possibly
transponders are operating
Then
The prognosis for long term spacecraft operation are excellent.
Channel Measured Parameter Measurement Range Calibration Equation
(Preliminary)
1A Total Solar Array Current 0 to 3000 ma I = 29.5 N (ma)
1B +X Solar Panel Current 0 to 2000 ma I = 1970 - 20N (ma)
1C -X Solar Panel Current 0 to 2000 ma I = 1970 - 20N (ma)
1D +Y Solar Panel Current 0 to 2000 ma I = 1970 - 20N (ma)
2A -Y Solar Panel Current 0 to 2000 ma I = 1970 - 20N (ma)
2B RF Power Out 70cm/2m 0 to 8 watts P = 8(1 - 0.01N)^2 (watts)
2C 24 Hour Clock Time 0 to 1440 min. t = 15.16N (min)
2D Battery Charge/Discharge -2000 to 2000 ma I = 40(N - 50) (ma)
3A Battery Voltage 6.4 to 16.4 V V = 0.1N + 6.4 (volts)
3B Half-Battery Voltage 0 to 10 V V = 0.10N (volts)
3C Bat. Chg. Reg. #1 0 to 15 V V = 0.15N (volts)
3D Battery Temperature -30 to +50 deg. C T = 95.8 - 1.48N (deg. C)
4A Baseplate Temperature -30 to +50 deg. C T = 95.8 - 1.48N (deg. C)
4B PA Temp. 2m/10m -30 to +50 deg. C T = 95.8 - 1.48N (deg. C)
4C +X Facet Temp. -30 to +50 deg. C T = 95.8 - 1.48N (deg. C)
4D +Z Facet Temp. -30 to +50 deg. C T = 95.8 - 1.48N (deg. C)
5A PA Temp. 70cm/2m -30 to +50 deg. C T = 95.8 - 1.48N (deg. C)
5B PA Emit. Current 2m/10m 0 to 1167 ma I = 11.67N (ma)
5C Module Temp. 70cm/2m -30 to +50 deg. C T = 95.8 - 1.48N (deg. C)
5D Instrument Sw. Regulator Input Current 0 to 93 ma I = 11 + 0.82N (ma)
6A RF Power Out 2m/10m 0 to 10,000 mw P = (N^2)/1.56 (mw)
6B RF Power Out 70 cm 0 to 1,000 mw P = 0.1(N^2) + 35 (mw)
6C RF Power Out 13 cm 0 to 100 mw P = 0.041(N^2) (mw)
6D Midrange Telemetry Calibration 0.500 V V = 0.01N(0.50 +/- 0.01) (V)
AO-7 telemetry format:
1aa 1bb 1cc 1dd
2aa 2bb 2cc 2dd
3aa 3bb 3cc 3dd
4aa 4bb 4cc 4dd
5aa 5bb 5cc 5dd
6aa 6bb 6cc 6dd
Hi Hi
then these data are valid when 6D is one of 649, 650 and 651.
73 Jan W4GEY/VK4GEY
..............................................................................
.............
> From: w7lrd(AT)comcast.net
> To: AMSAT-BB(AT)AMSAT.Org
> Date: Sat, 10 May 2008 18:41:15 +0000
> Subject: [amsat-bb] AO7 telemetry
>
> Hello
> Why does the telemetry on AO7 work sometimes? I ususally take a quick
listen, also does it respond to any comands. In my opinion it's the best
satellite we have up there! You can actually talk to someone for a reasonable
amount of time.
>
>
> --
> 73 Bob W7LRD
> AMSAT member 28498
> Seattle
------------------------------
Message: 3
Date: Sun, 11 May 2008 02:52:14 -0400
From: "Robert A. Netzband" <rnetzban(AT)twcny.rr.com>
Subject: [amsat-bb] Re: ARISS Quiet 5/11/2008 0629 Z
To: <amsat-bb(AT)amsat.org>
Message-ID: <000001c8b333$8bf9d850$a3ed88f0$(AT)rr.com>
Content-Type: text/plain; charset="us-ascii"
All was quiet from a 76 degree pass over central New York. 145.800 was quiet
as well was the digipeater on 145.825 for the entire 11 minute pass. ISS
crew was in wake up mode having only been awake for 10 minutes.
Bob NA2H.
------------------------------
Message: 4
Date: Sun, 11 May 2008 10:28:03 -0400
From: Stan <stan(AT)capecod.com>
Subject: [amsat-bb] P3E Microwave Frequencies
To: amsat-bb(AT)amsat.org
Message-ID: <48270273.8030300(AT)capecod.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello The Net:
Was just at the WWW.KEPS.IT website and saw a proposed frequency
plan for P3E.
I am starting to plan for Microwave receive only down converters and
transmit only up converters.
How firm is the frequency for the X band downlink at 10,490 MHz ?
Ditto for the L2 uplink of 1,263 MHz and S band uplink at 2,447 MHz ?
I am starting to look at possibilities of a common Local Oscillator (LO)
for some of the bands, but I am having no luck. Having a common LO or at
least
parts of a LO multiplier chain, would economize and maybe lend
themselves to being PLLed
to the station 10 MHz reference.
Has anyone come up with common LO and IF schemes for multiple P3E bands ?
My IC-910H will cover 1,263 MHz nicely, but it looks like all of the
other higher
bands will have a unique LO for the band, at least for X band and below.
Time to get ready....
Stan, W1LE FN41sr Cape Cod
ZZZZZ
------------------------------
Message: 5
Date: Sun, 11 May 2008 18:32:55 +0000
From: "D R Mynatt" <dave(AT)mynatt.biz>
Subject: [amsat-bb] Re: Delfi Not Heard
To: "JoAnne Maenpaa" <k9jkm(AT)comcast.net>, "amsat" <amsat-bb(AT)amsat.org>
Message-ID: <W3071710661213511210530775(AT)webmail16>
Content-Type: text/plain; charset="utf-8"
Interesting. Is the telemetry the same or would one be looking for modulated
tones only?
Dave
------------------------------
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End of AMSAT-BB Digest, Vol 3, Issue 238
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