This thread gives me the opportunity to say a long overdue thank you to Paul
for giving the satellite community such a good service with the amsat-bb.
It has been re directing my satellite mail for 5 or 6 years or more, without
any problems.
Thanks Paul
73 john G7HIA
Hi Satelliters,
Moving QTH soon and expect to be in an area where there are no external
antennas permitted.
Does anyone on the list have actual experience of working satellites with
antennas mounted inside the roofspace?
I would be very interested to hear of your experiences and what type of
Thanks to everyone who replied.
It seems that small yagis and quagis are OK in roof spaces provided that the
liner underneath the roof tiles is not metalised.
Contrary to my expectations, rain and snow on the roof doesn't cause problems.
DH5MK has some nice pictures of his attic antenna
Thanks to all contributors for an enjoyable thread, with some very
interesting ideas, however, there is a fundamental obstacle to transponders
on the Moon. The science packages used and left on the Moon by the Apollo
astonauts had radioactive heat sources which prevented the electronics from
Hi,
Just a bit of evidence for your consideration:
Valentina Tereshkova and Valery Bykovsky were in Coventry England a few years
ago and I was privilaged to be amongst the guests at a dinner held in their
honour. During the after dinner conversation they were asked about the
authenticity of
Hi Bruce and the bb,
Re: Amsat-UK FUNcube
What a great name Space Communicators Club
With potential worldwide participation by schools in the telemetry and
physiscs experiments I hope that amsat-uk can come up with a receiver that
can be mass produced and achive an easily affordable unit
Hi all telemetry fans
Copied just one frame from Pollux at 13:30 utc over England using my weather
sat turnstile (no other antennas at present).
POLLUX-1/TELEMCQUI,?,F0:
SYST 159093 0 0 33 0 01b1 12f0 0002 1190 1198 0066 1110 0044 0f50
0158 08d0 0fc0 003e
73 John G7HIA
Hi,
I agree with the comments that high degrees of pointing accuracy are not
required for satellite work.
However, if you are super keen to improve your pointing accuracy then you may
like to consider the modern version of the bore sight method.
A bore sight is basically a length of tube,
Hi Tim and the list,
Thanks for the kind comments.
Its not my original idea.
I picked it up years ago, possibly from Amsat-UK's journal OSCAR News, or
possibly eleswhere.
Just happy to pass it on. Someone may find it usefull, or suggest a
better/simpler implimentation of the same basic idea.
- Forwarded Message
From: John Heath g7...@btinternet.com
To: apbid...@mailaps.org
Sent: Thursday, 27 August, 2009 4:29:04 PM
Subject: Re: [amsat-bb] Re: best rotators
If you have the money the AlphaSpid is a very strong and well engineered unit.
Probably last for many years
Thanks to Bob for starting an interesting thread.
On boeard electrolysis of water to produce Hydrogen/Oxygen rocket fuel.
An most interesting paper on the subject at
https://e-reports-ext.llnl.gov/pdf/236614.pdf
It does work in space.
Could it get us from LEO to MEO?
Since Bob is a can do
another level of
interest.
Glad to have your prediction to add to the table.
73 John G7HIA
From: Nigel Gunn G8IFF/W8IFF ni...@ngunn.net
To: John Heath g7...@btinternet.com
Cc: Amsat amsat-bb@AMSAT.Org
Sent: Monday, 28 September, 2009 6:36:55 PM
Subject
Hi folks,
Thanks for the entries so far.
It has been pointed out that I didn't allow much time, so the closing date is
now one day later, midnight October 1st
To enter this fun competition send me your best estimate for the re-entry date
and time for Cute 1.7 Object 28941
Spacetrack suggests
Hi
Need a model of atmospheric density at varying altitudes, then this site may be
of interest.
http://omniweb.gsfc.nasa.gov/vitmo/msis_vitmo.html
73 John G7HIA
___
Sent via amsat...@amsat.org. Opinions expressed are those of the author.
Not an
Re-Entry Cute 1.7 Object # 28941
Update
Space Track have revised their re-entry prediction from October 10th to
the 14th.
73 John G7HIA
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Not Yet
Perigee Height is now below 200km but Cute 1.7 Object #28941 is still in orbit
Re-Entry predictions for around mid day October 13th from EI7IG and W7LRD
therefore drop out of the competition.
Is she staying aloft long than expected because of a high mass to surface area?
73 John
Cute 1.7 Re-entry
Its still up !!
Space Track elements for 07:24 this morning (October 21st) assign a Mean Motion
of 16.2309
and they have revised their re-entry forecast.
Unless something unexpected happens it looks like the only serious contender
left in the competition is Dave Bowman
Cute Re-entry Competition
Winners Declared
It seems that when a satellites, reache an altitude as low as about 170km they
will be down very quickly. According to Space Track elements, and InstanTrak
tracking software Cute was still orbiting when the perigee was below 150 Km.
My theory is
Hi Joe,
I didn't know about auto tuners used by musicians.
About 5 years ago I had a similar idea for tuning the Doppler without computer
control.
Thought it would be a neat feature inside a transciever so sent the idea to
Yaesu Japan but got no reply.
73 John G7HIA
Hi
Great to have such positive news about China's entry into the amateur radio
satellite field.
Alan Kungs recent posting was most encouraging. Will the space authorities in
China will have a similar positve attitude towards amateur radio within their
ambitious manned spaceflight program ? I
Hi Luc,
No satellite capability at present but I can confirm for anyone on the BB who
hasn't tried it, transatlantic contacts are perfectly possible via AO-51.
With most of Europe out of the footprint you will probably have the satellite
to yourselves.
Another great time to try, when the
Hi Ryan,
At first I ran my Alfa Spid off the shack 13.8V D.C. supply. I also got flicker
plus some anomalous readings.
I put this down to voltage drops on my power supply.
You might be having a similar experience as under load from the Spid motors
your car battery may not be giving 12 volts.
Spacewalks are easy to monitor. Your regular 2m antenna will work.
In the UK we get some interference from Air band Communications but can
generally get a good part of the conversation.
Note - It only works with the Russian spacesuits. American suits use a
different system.
73 John G7HIA
.
Enjoy V/S on AO-51
Visit www.uk.amsat.org and go to the shop.
There you will find an easy build complete kit for a patch antenna ideal for
AO-51
73 John G7HIA
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Not an
No full duplex handheld - here is a simple solution.
Use two rigs. Buy a 5w 2m radio for the uplink.
Several good ones available available at low cost.
If using an Arrow run separate cables for each radio, this avoids the diplexer
which some on this list report as a source of extras loss.
hi steve,
thanks for an informative post.
good to see the bb doing what it does best.
73 john g7hia
From: Stephen Melachrinos melac...@verizon.net
To: amsat-bb@amsat.org
Sent: Wednesday, 14 April, 2010 0:22:34
Subject: [amsat-bb] Re: Space Debris:
Greg -
I
A few years ago at the Amsat Colloquium University of Surrey we were privilaged
to have astronaut Ron Parise (SK) as a guest speaker. He explained the ignition
suquence for the shuttle in a very entertaining way, as best I remember it went
like this
As the engines come up to thrust the
Hi,
Just moved to a new QTH in southern england and considering new satellite
antennas.
The Cubex 2 and 70 dual band quad Yellow-Jacket 46 looks interesting at
www.cubex.com
Anyone using this antenna on satellites?
Any problems with desense with the two antennas on the same boom?
Feedback
Hi Satelliters,
Setting up a shack at the new QTH.
Does anyone have measured loss figures for N type connectors in a cable run
on 145 MHz and 437.
I have seen 0.5dB per connector quoted but have no idea if this accurate,
theoretical, or measured.
73 John G7HIA
Hi Larry,
Just a thought about your problem.
I don't know the antenna but with a 30 in the code number I expect it is a high
gain/narrow bandwidth antenna.
If so your experience may be like mine.
I had a 2x21 element for a while and it was just too narrow beam. Its not the
3dB lobe thats the
Hi,
Getting ready for ARISSat-1 and need a new soundcard.
The PC is an old HP dx 6050 2.08Ghz with windows XP pro.
Any recomendadations for a low cost soundcard for digi modes.
Don't do any gamimg or activities that need high performance card.
Just for radio purposes.
Any advice appreciated.
Just been looking at the tracking site http://www.n2yo.com/satellites
Some great stuff on this site and thanks for posting the URL to the bb.
At the bottom of the amateur radio satellite page there is a listing for
OPS9328
(IDSCS 15)
Were they ham satellites, I don't recal reading about
Hi,
In my experience, pre launch keps don't have a checksum. They just show the key
numbers that define the orbit.
My tracking software wont load them automatically. If you key them in manually
it should work fine. You can then run the software and see how the passes will
look for your QTH.
I
My best DX on AO-40 was VK5DG south Australia from central england.
70cms up 2.4GHz down.
Happy days !!
73 john G7HIA
From: P.H. bbjun...@f2s.com
To: amsat-bb@amsat.org
Sent: Sunday, 20 March, 2011 1:17:40
Subject: [amsat-bb] AO-40 range record ??
Hi,
For
Geoff Dover G4AFJ sent this to me today.
You may be interested in this one from this week's ARRL DX Bulletin.
KAZAKHSTAN, UN. Special event stations R50YG and R50SK are QRV from
Baikonur until April 14 in celebration of the 50th anniversary of the first
flight of Yuri Gagarin. This includes an
0107 AOS pass in range UK - nothing heard on 145.950
73 john g7hia
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0520 UTC
The gagarin station R50KEDR on 14.190 working split listening 5 up.
Weak signal at my QTH in southern England
73 john g7hia
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Not an AMSAT-NA member? Join now to
Hi Satelliters,
Might cause some flames with this but here goes:
With a good few years of operating on the SSB sats, AO's-10,13,40, RS10,
FO-20,FO-29 and 98 countries confirmed I can agree totally with the one true
rule in theory. When stations at each end of the QSO use the method it works
0203 UTC SSTV
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0048 UTC South West of England IO82ej
Strong SSTV signal heard but not decoded.
Satellite at 5 degrees elevation.
73 John G7HIA
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Hi satelliters,
Delighted to see on the satus page http://oscar.dcarr.org/ that the transponder
is working.
Congratulations to everyone involved.
What was the problem/fix for the antenna problem that delayed the launch to
later in the spacewalk.
Can't find anything new on the amsat.org web
Hi,
Can anyone on the list point me to source of high resolution images of
AO-40/P3E.
Need it for a magazine article. The images found via google are all low res.
Tried Peter DB2OS at amsat-dl but no reply as yet, and my deadline is two days
away.
Thanks
John
G7HIA
Hi
I can now meet the publication deadline.
Thanks to everyone who replied, including Peter DB2OS Amsat-DL
73 John G7HIA
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Hi Cris
There is an additional benefit with Fibreglass tube.
Just use the wood inserts on the clamping areas, rotator and antenna clamps.
Then the tube will flex in high winds and absorb some wind enegy.
73 John G7HIA
From: Howard Long how...@howardlong.com
Hi,
At a new QTH and setting up a dual band quad antenna for 2m and 70cm.
I plan to make the 70cms antenna,the vertically polarised one, 2m horizontal,
as I believe this is the normal arrangement.
If anyone has practical experience that goes against this assumption I would be
interested,
Is Prospero still transmitting?
Sometime ago, I think in 2007 the BBC TV program Coast was on the Isle of White
where there had been a test stand for rocket testing.
They talked about Prospero and had a short piece with some people trying to
hear
it with a small yagi. Apologies but the
Hi Trevor,
Many thanks for the link to DD1US, great to have these recordings preserved.
73 John G7HIA
From: Trevor . m5...@yahoo.co.uk
To: amsat-bb@amsat.org
Sent: Tuesday, 6 September, 2011 12:52:32
Subject: [amsat-bb] Re: Is Prospero still TX'ing?
Hi,
Looked to see what I had on Prospero from the previous attempts to hear it.
This might be of interest. I only have this fragment, not the entire paper, or
section 4.4 more's the pity.
73 John G7HIA
Accession Number : AD0734634
Title : Orbital Operations Handbook for the X3 Satellite.
Hi,
Buzz Aldrin, Scott Carpenter, Ed Michel and Bruce Candless will be at the
Autographica Event Radisson Edwardian Hotel Heathrow London
14-16th October 2011.
When Buzz visted the National Space Centre in Leicester England a year or two
ago he gave a lecture but did not sign autographs, as
Hi,
not sure if the -bb supports attachments but will give it a try.
I have images of the control station complete with 1970's computers, and the
receiving station.
Nice picture of the antenna array which appears to be four crossed yagi's in a
square, each one has 8 pairs of elements.
73 John
Interesting thread regarding MET and ARISSat-1 switch on.
Someone made the very good point that the transition in or out of sunlight
(eclipse) is not an on/off event. I remember many MIR visuals, and as she
passed
from sunlight in the west to darkness in the east there was a significant
Hi Ken and the bb,
ARISSat-1 heard in south Devon 1080ej this morning 10:00 utc pass.
It didn't switch on until quite late into the pass. Voice tlm gave MET as 16
minutes.
I timed the announcement it at 10:11:16 UTC. (radio controlled clock)
73 John G7HIA
This bb never fails to amaze me with how helpful folks can be.
It was G0SFJ's postings about ARISSAt-1 MET time which set me thinking about
the
width of the half shadow (Penumbra) experienced by the satellite before and
after eclipse.
I was pointed to the simulation option in the satellite
Hi Greg,
Making my head hurt too. Buts it interesting.
I though I might get a 70cms antenna up and try the telemetry from FO-29 which
flies much higher = wider penumbra.
Perhaps the changed light level will be detectable in the solar panel current.
I
don't know how dark it is in the penumbra
Hi Kevin,
I doubt the problem is your keps if you have an up to date set from any of the
sources suggested.
You might want to check the following:
Your PC clock may not have the correct time
There may be something in an initialisation routine that has set a default time
zone, or an offset
Hi folks,
The Celestrak web site has some great in depth stuff on keps and tracking.
I think most people just drop onto the site to get the keps, but its certainly
worth a more detailed look.
A big thank you to Dr. Kelso for a great site.
73 John G7HIA
Hi folks,
Just got my first 1000 BPSK frames of data using the ARISSat-1 Telemetry
software.
Appreciate most of you on the bb have probably already done it already.
I just wanted to say a public thank you for a superb and easy to use piece of
software.
Looks cool on screen too.
Using the CW
Hi,
Thought I would give the ARISSat transponder a try.
Any recomendations from those that have worked it.
I have available a 9 element yagi and about 20W at the feed point
Is this likely to work or do I need a few kW ?
Thanks
John
G7HIA
___
Just my 2 cents worth,
Whichever side of the debate you happen to be on, and I can see both sides,
there is one thing to be said in favour of the so called beep sats
They keep our frequencies warm whilst we wait for bigger and better satellites
73
John
G7HIA
Hi Jim,
Thanks for the update on your AMSAT Journal article.
There are several people on the bb who are following this topic and are busy
plotting data.
Any futher thoughts you have, as we move towards January would, I am sure be of
interest.
73 John G7HIA
Hi Farrell,
great post and congratulations.
I am currently having fun with the 1000BPSK telemetry.
Next experinment will be a QSO through the transponder.
Its good to have a satellite that presents a few challenges.
I echo your thanks to the entire ARISSat team.
73 John G7HIA
Hi Nico,
Good to see postings on this topic.
I plotted daily change in Mean Motion, and then plotted Solar Flux for the same
period. (15days).
It'snot obvious from the shapes of the two graphs that SF is producing the
daily variation.
I tried the correlation function in Excel which returned
Hi Satelliters,
Using Keps from Space-Track for ARISSat-1 (37772) I have been plotting
various parameters including Mean Motion.
Rrecent results were unexpected.
From day 328to 334 the daily change in Mean Motion has been exactly the same.
The orbital decay is going at a very steady rate.
Hi Gents,
I have been working on an excel spreadsheet regarding ARISSat-1, orbital decay
and atmospheric density.
Its a small workbook with some calculations and a chart.
The idea is to work out the volume that ARISSat-1 sweeps through per orbit,
then calculate the mass of atomic material
Hi Gents,
A couple of years ago I was privilaged to work with university students on a
cubesat project. They were mostly space science and engineering students of
very high calibre indeed. It was a pure delight to be in the company of such
focussed and inteligent youngsters. They had no
Hi Orbitron users.
I find the simulation feature is very useful but I can't find out how to pause
it.
Does anyone have the required key strokes, or is that feature not included in
the software.
Thanks
John G7HIA
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Orbitron Help
Thanks to those who replied.
Now that I know how to pause the Orbitron simulation I can get on with the
orbital decay project I am working on.
I just love it when members of this bb are so helpful.
Its what its all about.
73 John
G7HIA
hi guys,
in the olden days a satellites TCA could be determined by using pencil and
graph paper and plotting time v frequency.
Is there a modern and more elegant way of doing it with signal anaysis software
like Spectravue, Spectran or similar.
Need it for an education outreach project and I
Hi Jim,
Looking forward to your ARISSat-1 decay posting.
My plots suggest the bird will be down to 140km around 11th of January,
provided the SFI and A index stay similar to current values
73 John G7HIA
From: DeYoung James deyoung_ja...@yahoo.com
To:
Hi,
60 day predictions on the Space-Track web site has ARISSat-1 object 37772 re
entering 30th December.
Based on the posts on this topic from Nico, Roland and James, and my
calculations, I think we have a bit longer.
But only a few days.
73 John G7HIA
Hi,
Nothing heard on the 10:10 Z pass over the south of England.
I was monitoring from 5 minutes before predicted AOS to take into account the
rapid changes in the keps.
73 John G7HIA
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Hi,
Any UK stations copied Chibis-M ?
73 John G7HIA
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Hi,
MASAT client working nicely, have captured a few frames this afternoon, but
more by accident than judgement.
The ARISSAT software was fairly tolerant of an off tune signal.
How close do we need to hold the waterfall display to the frequency markers?
If the MASAT team are watching the bb
Hi,
Just had an e-mail from the Masat team confirming receipt of my telemetry
packets via their masat client software.
Before I started I installed the latest version of Java as recomeneded ( I
already had an earlier version on the PC).
Running on an oldish PC under XP and the standard
Hi,
Tried a afternoon pass today ( Friday) Listening for PW-SAT but nothing heard.
I only have an omni + mast head pre-amp but expected to hear it. Using Hamscope
I could decode the signal just after launch
I may have the wrong keps, although I did listen for about 10 minutes on either
side
Length might work if its a suitable fraction of the wavelength of the radar
signal.
See the British use of Window in the 1940's. Aluminium foil strips were
dropped from aircraft to confuse enemy radar.
73 John G7HIA
Sent via AMSAT-BB@amsat.org. Opinions
Hi Jim,
I am sure I am expressing the views of the many who would dearly like to attend
but can't due to personal circumstances.
The live stream is a great way for us to have some involvement, the emphasis
being on live.
Of course the recorded stream will be welcome but
Hi All,
Just updated keps for noaa weather satellites from Celestrak and find the the
file contains mostltly birds that are no longer operational.
How can I delete the unwanted birds.
Thanks
John G7HIA
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Thanks to everyone who replied.
There were two solutions,
Pre filter the download from Celestrak so that only the wanted sats go into the
TLE file.
Edit the TLE file in Orbitron to remove the unwanted sats.
Both good solutions.
73 John G7HIA
Hi guys,
Currently in hospital on intravenous Meds for a serious blood infection.
Hope to be home in week or two.
Wishing you all best.
John G7HIA
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