Our initial block of 30 rooms at the Fairfield Hampton Inn has been filled.
I have just negotiated another 7 rooms( with king bed). If you are
interested, please call me ASAP. I do have to "return" any rooms by April
20th. Martha - AMSAT Manager (301-589-6062)
23 March 2007
OSCAR-11 celebrated it's 23rd birthday on 01 March 2007. Congratulations
to Professor Sir Martin Sweeting G3YJO, his team at the University of
Surrey and associated radio amateurs for their magnificient achievement.
During the period 14 February to 22 March 2007, the satellite was heard
from 18 to 28 February and from 11 to 21 March . Good steady signals
have beeen heard on most passes, and good copy of the telemetry obtained.
The on-board clock has comntinued to maintain accurate time. However,
there are two problems with the date and time display in the ASCII
telemetry. Firstly, the date counter appears to be incrementing correctly,
but the day of the month is reset to 41, at the end of each month, instead
of being reset to one. A likely cause is that the unused bit
representing 40 in the ASCII code for the day of the month, is permanently
stuck at a one. This may be related to the '0=' display error when the
month was 09, previously reported.
The second problem, is that the hours are incorrectly counting and/or
displayed. Since August 2006, the hour count has never exceeded 12.
During one pass recently the hour count changed from 12 to 01
instead of to 13! A possible explanation is that the time/date chip has
two modes of operation, which are switchable between 12 or 24 hour modes.
An internal chip fault or an external circuit fault may have switched the
chip into the 12 hour mode.
Investigating this problem has been difficult, because the satellite
passes over the UK at roughly the same times, each day, and only a limited
number of pass times are available for analysis. If the above explanation
is correct, the date changes around 04:47 UTC, each day.
The 'day of the week' counter operates reliably, zero representing
Thursday. At the present time the total clock error is 37.21444 days slow.
If the satellite's watchdog timer continues to operate normally, the beacon
should switch ON around 31 March/ 01 April 2007. The satellite is in full
sunlight at the present time, and will remain in this state until
20 April 2007, when eclipses start again. The eclipses are expected to
continue until 23 August, and if the satellite performs as it did last
year, it is unlikely to be heard, for any length of time, during the
I am indebted to David VK5DG, David G8OQW, Etienne ZS6Y, Jeff KB2M, Geoff
ZL6GA, Edward BX1AD, and Sil ZL2CIA for their reports. Many thanks.
The current status of the satellite, is that all the analogue telemetry
channels, 0 to 59 are zero, ie they have failed. The status channels 60 to
67 are still working. The spacecraft computer and active attitude control
system have switched OFF, ie. the satellite' attitude is controlled only by
the passive gravity boom gradient, and the satellite is free to spin at any
speed. When telemetry was last received it showed that one of the solar
arrays had failed, and there was a large unexplained current drain on the
main 14 volt bus. After 22 years in orbit the battery has undergone around
100,000 partial charge/discharge cycles, and observations suggest that it
cannot power the satellite during eclipses, or sometimes during periods of
poor solar attitude.
The watchdog timer now operates on a 20 day cycle. The ON/OFF times have
tended to be very consistent. The average of many observations show this to
be 20.7 days, ie. 10.3 days ON followed by 10.4 days OFF. However, poor
solar attitude may result may result in a low 14 volt line supply, which
may cause the beacon to switch OFF prematurely, and reset the watchdog
timer cycle. When this occurs, the beacon is OFF for 20.7 days.
The Beacon frequencies are -
VHF 145.826 MHz. AFSK FM ASCII Telemetry
UHF 435.025 MHz. OFF
S-band 2401.5 MHz. OFF
Listeners to OSCAR-11 may be interested in visiting my website. If you need
to know what OSCAR-11 should sound like, there is a short audio clip for
you to hear. The website contains an archive of news & telemetry data. It
also contains details about using a soundcard or hardware demodulators for
data capture. There is software for capturing data, and decoding ASCII
telemetry. The URL is www.users.zetnet.co.uk/clivew/
If you place this bulletin on a terrestrial packet network, please
use the bulletin identifier $BID:U2RPT131.CWV, to prevent duplication.
73 Clive G3CWV xxxxx(a)amsat.org (please replace xxxxx by g3cwv)
It is once again time for Field Day and if you would like to participate
in AMSAT's Field Day, the rules for this year are posted. They will be
on the AMSAT web page (as soon as the update there is performed).
or.... from the drop down "Site Quick Reference" select Field Day
The rules are also available from my web site in both PDF and DOC
If you are using Internet Explorer, they can be selected directly from
the menu on the main page.
Bruce Paige, KK5DO
AMSAT Director Contests and Awards
ARRL Awards Manager (WAS, 5BWAS, VUCC), VE
Houston AMSAT Net - Wed 0100z on W0KIE Intelsat Americas, T1, 6.2/6.8Mhz
Also streaming MP3 at http://www.amsatnet.com
Latest satellite news on the ARRL Audio News
The 23th of March I will be in DL74 or 73 just in SO50 at the 1758 pass...
If you need this grid keep in touch
Windows Live Spaces en Prodigy/MSN Spaces: Crea tu propio espacio.
The next CubeSat launch is scheduled for 27Mar07 6:46:35UT via a ISC Kosmotras Dnepr launch vehicle
from Baikonur Cosmodrome, Kazakhstan. Four-of-seven CubeSats will be using Amateur Radio
frequencies and modes as follows:
CalPoly PolySat CP3
436.845MHz (1W) 1200bps FM AFSK AX.25 (Part-5 experimental license)
CalPoly PolySat CP4
437.325MHz (1W) 1200bps FM AFSK AX.25
University of Louisiana CAPE-1
435.245MHz (1W) 9600bps FM FSK AX.25 and CW telemetry
during opposite 30sec intervals using call sign K5USL
Forward received telemetry to jd.harrist(a)gmail.com
Universidad Sergio Arboleda (Colombia) Libertad-1
437.405MHz (400mw) 1200bps FM AFSK AX.25
Also see http://cubesat.atl.calpoly.edu/ and http://showcase.netins.net/web/wallio/CubeSat.htm for
P-POD A (Preliminary)
1 xxxxxU xxxxxxxx 07086.29310451 .00000000 00000-0 00000-0 0 0000x
2 xxxxx 098.0870 161.6633 0071000 198.4663 339.8290 14.52700000 1x
P-POD C (Preliminary)
1 xxxxxU xxxxxxxx 07086.29311609 .00000000 00000-0 00000-0 0 0000x
2 xxxxx 098.0870 161.6633 0084000 198.3918 339.9240 14.51600000 1x
P-POD B (Preliminary)
1 xxxxxU xxxxxxxx 07086.29312766 .00000000 00000-0 00000-0 0 0000x
2 xxxxx 098.0870 161.6633 0090000 199.4051 339.9000 14.50500000 1x
Preliminary First Orbit Schedule
27Mar07 06:46:35UT Launch
07:02 CubeSat separation
07:08 AOS South Africa
07:52 AOS Hawaii
07:59 AOS CalPoly
08:01 AOS Alaska
08:20 AOS Northern Europe
08:25 AOS Central Europe & UK
11:16 First AOS Japan
11:30 CP3/CP4 start transmitting
15:04 First AOS WØRPK-Iowa
TNX es 73 de Ralph Wallio, WØRPK
Hubbert's Peak - The Mother of all Perfect Storms
Usually, an RF voltage is specified as potential difference (PD), i.e.
the voltage when connected to a 50 ohm load.
To convert uV to dBm :-
i) work out the power in Watts :- P=V^2/R so 25uV equates to 12.5pW or
ii) Multiply by 1000 to give the answer in mW; i.e. 0.0000000125mW.
iii) Take the logarithm and multiply by 10 to give -79dBm.
However, I'm not sure where 12.5uV comes from - a typical VHF receiver
needs about 0.25uV or better - that's -119dBm; if your radio really
needs 25uV then there is something seriously wrong.
Can any of these cubesat' that are constantly being shot up be configured to a linear transponder? This way the non digi types can use them.
73 Bob W7LRD
-------------- Original message --------------
From: "Ralph Wallio, W0RPK" <W0RPK(a)netins.net>
> The next CubeSat launch is scheduled for 27Mar07 6:46:35UT via a ISC Kosmotras
> Dnepr launch vehicle
> from Baikonur Cosmodrome, Kazakhstan. Four-of-seven CubeSats will be using
> Amateur Radio
> frequencies and modes as follows:
> CalPoly PolySat CP3
> 436.845MHz (1W) 1200bps FM AFSK AX.25 (Part-5 experimental license)
> CalPoly PolySat CP4
> 437.325MHz (1W) 1200bps FM AFSK AX.25
> University of Louisiana CAPE-1
> 435.245MHz (1W) 9600bps FM FSK AX.25 and CW telemetry
> during opposite 30sec intervals using call sign K5USL
> Forward received telemetry to jd.harrist(a)gmail.com
> Universidad Sergio Arboleda (Colombia) Libertad-1
> 437.405MHz (400mw) 1200bps FM AFSK AX.25
> Also see http://cubesat.atl.calpoly.edu/ and
> http://showcase.netins.net/web/wallio/CubeSat.htm for
> more information.
> P-POD A (Preliminary)
> 1 xxxxxU xxxxxxxx 07086.29310451 .00000000 00000-0 00000-0 0 0000x
> 2 xxxxx 098.0870 161.6633 0071000 198.4663 339.8290 14.52700000 1x
> P-POD C (Preliminary)
> 1 xxxxxU xxxxxxxx 07086.29311609 .00000000 00000-0 00000-0 0 0000x
> 2 xxxxx 098.0870 161.6633 0084000 198.3918 339.9240 14.51600000 1x
> P-POD B (Preliminary)
> 1 xxxxxU xxxxxxxx 07086.29312766 .00000000 00000-0 00000-0 0 0000x
> 2 xxxxx 098.0870 161.6633 0090000 199.4051 339.9000 14.50500000 1x
> Preliminary First Orbit Schedule
> 27Mar07 06:46:35UT Launch
> 07:02 CubeSat separation
> 07:08 AOS South Africa
> 07:52 AOS Hawaii
> 07:59 AOS CalPoly
> 08:01 AOS Alaska
> 08:20 AOS Northern Europe
> 08:25 AOS Central Europe & UK
> 11:16 First AOS Japan
> 11:30 CP3/CP4 start transmitting
> 15:04 First AOS WØRPK-Iowa
> TNX es 73 de Ralph Wallio, WØRPK
> Hubbert's Peak - The Mother of all Perfect Storms
> Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I have available an Alinco DJ-G5T dualband (2m/70cm)
HT in very nice condition. This HT will do dual
receive, so you can listen to 2 different frequencies
at the same time. It will do up to 5 watts out. It
comes with 3 batteries (cannot guarantee the condition
of these, but each takes a charge), the drop in
charger (not a rapid one, but you can charge the
battery off of the HT), antenna, belt clip and a copy
of the manual on CD. HT works fine, and even has a
built in bandscope, so you can see activity on other
channels around you.
This would make a great satellite HT. It is pretty
much Alinco's version of the Icom W32A.
I am asking $130 plus shipping for the package.
ALways open for trade offers involving other HTs.
73s John W5TD
We won't tell. Get more on shows you hate to love
(and love to hate): Yahoo! TV's Guilty Pleasures list.
I am looking for 1 or 2, M2 436CP42 U/G
circular polarized antenna's. (or similar)
TLC can be needed depending on the price.
Also looking for 1 or 2, M2 2MCP22
circular polarized antenna's. (or similar)
TLC can be needed depending on the price.
Advanced Receiver Research
MSP432VDG-160 preamp in any condition. Condition depicts price.:-)
Advanced Receiver Research
MSP144VDG-160 preamp in any condition. Condition depicts price.:-)
Also would like to have the Bias T's for the preamps.
A good friend will come and bail you out of jail,
A TRUE friend will be sitting next to you saying.....
"DAMN THAT WAS FUN"