Hi Jim,
Re - Colloquium dates.
I have just received my "GEO" publication form Francis Bell and the group.
He has I am afraid published the dates for our next colloquium as July 27
-29, 2007
Perhaps he has assumed the same dates as last year?
Kind of him to assist in marketing for us as he also states that GEO hope to
be invited once again.
The other note is that they are holding the "GEO" annual symposium at the
NSC Leicester
date: Saturday May 19th, 2007.
Cheers
Ken
GW1FKY
I asked this before, but I probably wasn't very clear. I just installed
SatPC32 and really like it. it is a very well written package.
One feature I really like is that it is possible to fine-tune adjust the
offset between uplink and downlink frequency. This is a very useful tool
as, for me; I find that I need about +2kHz correction on my uplink to bring
FO-29 right onto my downlink frequency. Problem is, once you close the
program, this offset is lost. Is there a way to save that offset in the
Doppler file or somewhere else so I don't need to keep entering it?
Thanks,
Michael K3MH
Bob -
Nice photos to see.
I can identify the lab equipment on the bench (looks like my high school & college labs - 1970s) with the NiCad battery pak, EXCEPT for the rectangular box with metal handles to the right of the NiCads.
NiCad battery charger? Homwbrew power supply?
http://n4hy.smugmug.com/gallery/2053069/1/105529591
w9gb
N4HY sent this note:
> There was one series string of Nicads as can easily be discerned from
> this photograph:
>
> http://n4hy.smugmug.com/gallery/2053069/1/105529609
>
>
>
> You can notice the series string starts at the upper left and works its
> way right and then down to the lower string and back to the left.
>
> Bob
> N4HY
>
Those are sealed, space-rated NiCd batteries built to NASA's
specification. The package you see is the flight spare for the Radio
Astronomy Explorer (RAE) satellites. They originally cost ~$2000 per
cell. With later satellites, AMSAT found that we could "make our own"
batteries that were better by carefully screening industrial-grade
commercial batteries by following a recipe devised by the late Larry
Kayser VE3QB/VA3LK/WA3ZIA.
RAE-A = Explorer 38
(http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1968-055A),
launched July 4th, 1968 flew in MEO. This satellite had a a pair of
Vee-beam antennas which provided gravity gradient stabilization. With
each Vee-beam being 750' long, the satellite's 1500' total length made
it the biggest structure put into space. The antenna booms were made of
flat beryllium copper tape that formed itself into a round tube after
being unrolled.
RAE-B = Explorer 49 flew June 15th, 1973 into Lunar orbit
(http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1973-039A). It
also had the same long Vee-beam antenna. The very lumpy lunar gravity
field made for interesting problems with the gravity gradient booms!
FYI -- I note with some pride that I came to Goddard in 1968 as a staff
scientist working on RAE-A and then RAE-B. I migrated from low-frequency
radio astronomy into Pulsar and VLBI work.
FYI#2 -- In addition to the flight spare batteries, Oscar-8's 10M
antennas owed their existence to the RAE project.
73, de Tom K3IO (ex W3IWI)
Hi all, just making a mention of this experiment again for anyone that
missed it.
I just received this.
>
>Dear friends!
>Thank you for support of the space experiment "Shadow" on ISS. More than
>200 claims have been registered, the experienced hams Gennady Tjapichev
>(R3XB) and Guy Roels (ON6MU) presented the special tools for generation of
>a short beacon, some groups of hams had conducted trial experiments "in a
>ground" air for checkout of a methodology. The ground preparation of the
>space experiment "Shadow" in a part of an amateur radio is practically
>completed so that we could proceed to a following step, namely to "cold"
>experiments in an orbit even an year ago.
>However, fulfillment of the scientific programs on ISS was noticeably
>quickened only with new flights of "Shuttles".
>In order to begin with space experiment "Shadow", it was offered to conduct
>a few auxiliary sessions of its cold phase in a digipeater mode. Sergey
>Samburov (RV3DR), the employee of space-rocket corporation "Energia" which
>is responsible for an amateur radio on ISS, explained that this mode is
>already in use for available onboard amateur radio and allows to overcome
>many formalities.
>At the moment there is a decision to perform the first trial session on the
>European measuring field as it is the most long and dense. Never the less
>I'd like all to recollect all and look through the results of this European
>session in order to be ready in your turn.
>So I invite you to visit again our page
>http://www.tsniimash.ru/Shadow/Next-eng.htm., check yourself in lists and
>on maps, exam the section " Cold experiments " and other new materials and
>further take part in the experiment as terms and requirements of its
>realization will be additionally presented. Also I ask you to present this
>invitation to your local BBS, the more participants the better.
>
>73, Valentin Strashinski, principal investigator, TSNIIMASH.
>
>æÏÔÏÐÅÞÁÔØ ÎÁ æÏÔÏ(a)Mail.ru - ×ÓÅÇÏ 2.5 ÒÕÂÌÑ ÚÁ ÏÔÐÅÞÁÔÏË 10È15!
>http://r.mail.ru/cln3167/foto.mail.ru/catalog/photoprint.html
or google E.T. shadow
_________________________________________________________________
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Hi AMSATs,
I am looking for some way to make a WISP compatible
packet BBS, for full-duplex and high efficiency data
communication. There have been many satellites with
this system and I wonder if there is some kind of
design/software free available for it.
The modems and TRX is not a problem, as I have it
available in transponder format :o) The problem is
mainly the boardcomputer software that handles the
messages and communcation protocols etc. what I am
looking for.
73 de PE1RAH
William
---
____________________________________________________________________________________
Do you Yahoo!?
Everyone is raving about the all-new Yahoo! Mail beta.
http://new.mail.yahoo.com
Bob, and others,
There seem to be 12 cells wired in series. It looks like there is a
"tap" in the middle between 6 and 7 (two white wire). Cell 5 (counting
clockwise from the top left) seems to have a temperature sensing element
bonded to it.
There are leads away between cells 1 and 2 and 11 and 12 (orange and
black). In fact these look like they might even be the main supply
leads, making the main supply only 10 cells in series. Looking closely
you can see a "+" sign on one of the terminals post of each cell, so it
looks like the two orange wires are the +ve supply and the black -ve
(logically enough).
Even when I look at the largest version of the picture, I can't see how
the very first, and the very last cells are connected. One would seem
to provide a "below" zero voltage and the other an above Vcc voltage.
Thanks again Bob. I'll go back to the telemetry a see if I make any
interpretations from this.
Sil
By-the-way. Both the comcast mail server Bob uses, and the server used
by AMSAT have become very fussy about the senders email address. Both
rejected my initial message (with an amsat.org reply-to address).
Antispam measures, I guess.
I plugged that data into the AO-7 telemetry calculator and got:
CH CHANNEL NAME Value
== ============ =====
1A Total Solar Array Cur 2360 ma.
1B +X Solar Panel Cur 370 ma.
1C -X Solar Panel Cur 370 ma.
1D +Y Solar Panel Cur 370 ma.
2A -Y Solar Panel Cur 930 ma.
2B RF Pwr. Out 70/2 1.8432 watts
2C 24 Hr. Clock Time 811.2 minutes
2D Batt Chg/Dischc Cur. 80 ma.
3A Battery Voltage 8.8 volts
3B Half-Batt Voltage 2.4 volts
3C Bat. Chg. Reg. #1 3.6 volts
3D Battery Temperature 60.28 C
4A Baseplate Temp. -46.28 C
4B PA Temp 2/10 Rptr -46.28 C
4C +X Facet Temp. -46.28 C
4D +Z Facet Temp. -46.28 C
5A PA Temp. 70/2 Rptr -4.84 C
5B PA Emit. Cur. 2/10 793.56 ma.
5C Modul. Temp. 70/2 -4.84 C
5D Instr. Sw. Reg. 66.76 ma.
Input Cur.
6A RF Pwr Out 2/10 5907.69230769231 mw.
6B RF Pwr Out 435 956.6 mw.
6C RF Pwr Out 2304 377.856 mw.
6D Midrange Telemetry 0.96 V Typ.(0.50 +- 0.01)
Calibration
----- Original Message -----
From: TERRY BROMLEY
To: AMSAT
Sent: Monday, November 27, 2006 4:56 PM
Subject: AO-7 2000, K3SZH JOE.
Well done Joe, 2000 in the log on the old bird.
73 Terry G1WPR.
