| |
CX2SA > SATDIG 31.05.08 13:18l 802 Lines 28976 Bytes #999 (0) @ WW
BID : 7019_CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V3 275
Path: IZ3LSV<IV3SCP<SR1BSZ<SP7MGD<CX2SA
Sent: 080531/1121Z @:CX2SA.LAV.URY.SA #:7019 [Minas] FBB7.00e $:7019_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: ISS QSO's? (Ransom, Kenneth G. (JSC-OC)[BAR])
2. Re: SatPC32 V12.8 (George Henry)
3. primestar/feed 4 sale (w7lrd(AT)comcast.net)
4. Re: Shuttle question (Tony Langdon)
5. Re: Re grizzles (Tony Langdon)
6. Re: SATPC32 version 12.8 SuM glitch? (George Henry)
7. Re: Test Gear for 1.2/2.4Ghz Equipment (John P. Toscano)
8. Re: JUBILEE and other frustrations, (Joe Westbrook)
9. RS-30 (dobarrows(AT)aol.com)
10. Re: RS-30 (Mineo Wakita)
11. My first satellite contact (Piyumi Perera)
12. New satellies / Shuttle question (G0MRF(AT)aol.com)
13. Re: RS-30 (Mike Rupprecht)
14. Re: Test Gear for 1.2/2.4Ghz Equipment (Mark L. Hammond)
15. Re: RS-30 APT (Mineo Wakita)
----------------------------------------------------------------------
Message: 1
Date: Fri, 30 May 2008 16:01:35 -0500
From: "Ransom, Kenneth G. (JSC-OC)[BAR]" <kenneth.g.ransom(AT)nasa.gov>
Subject: [amsat-bb] Re: ISS QSO's?
To: <w0dxz(AT)aol.com>, <amsat-bb(AT)AMSAT.Org>
Message-ID:
<A2862DA1C49F4145AF6C2A452829403501A91D65(AT)NDJSEVS21A.ndc.nasa.gov>
Content-Type: text/plain; charset="us-ascii"
The ISS is always open for random FM QSO's but the crew members
themselves may not be available or willing to make them. That changes
with every crew rotation.
AZ is in ITU region 2.
Kenneth - N5VHO
-----Original Message-----
From: amsat-bb-bounces(AT)AMSAT.Org [mailto:amsat-bb-bounces(AT)AMSAT.Org] On
Behalf Of w0dxz(AT)aol.com
Sent: Friday, May 30, 2008 9:52 AM
To: amsat-bb(AT)AMSAT.Org
Subject: [amsat-bb] ISS QSO's?
Is the? ISS ever open for random FM QSO's anymore or is it all school
stuff?
Hmmm AZ is in which zone?
Bob W0DXZ
_______________________________________________
Sent via AMSAT-BB(AT)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
------------------------------
Message: 2
Date: Fri, 30 May 2008 16:25:28 -0500 (GMT-05:00)
From: George Henry <ka3hsw(AT)earthlink.net>
Subject: [amsat-bb] Re: SatPC32 V12.8
To: amsat-bb(AT)amsat.org
Message-ID:
<3369172.1212182728428.JavaMail.root(AT)elwamui-
polski.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
For the Icom radios, an additional handshaking line must be connected to
prevent the program from trying to write to the radio while it is
transmitting. CAT control will not work unless this signal is wired up.
See the file SatpcISS.txt in the SatPC32 folder for details.
73,
George, KA3HSW
-----Original Message-----
>From: James Denneny <57JNDenneny(AT)comcast.net>
>Sent: May 30, 2008 10:24 AM
>To: amsat-bb(AT)amsat.org
>Subject: [amsat-bb] SatPC32 V12.8
>
>V12.8 is up and running. I learned the hard way that it is essential (as
>instructed) to copy all SatPC32 files into a new folder I named SatPC32_127.
>Then totally uninstall SatPC32 including removal of folder. Then, do a
>regedit removal of all vestiges of SatPC32 values before installing V12.8.
>I could then copy all my setup, keps etc from the SatPC32_127 folder to
>V12.8.
>
>
>
>One thing noted - when running SatPC32ISS V12.8, the CAT feature is not
>working with my IC910H. The CAT works with the regular SatPC32 v12.8
>program. Is this normal?
>
>
>
>Jim K7EG
>Auburn WA
>
------------------------------
Message: 3
Date: Fri, 30 May 2008 21:38:02 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] primestar/feed 4 sale
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<053020082138.22487.484073BA000A4687000057D722165514060B9D04C999(AT)comc
ast.net>
Content-Type: text/plain
Hello
I'm trying to make some room in the garage (xyl edict). I have a 36X30 inch
primestar dish with 5 1/2 turn helix feed, that is currently surplus to my
needs. All it needs is a downconverter. This design was proven on AO-40
(sobsob). For pictures, details, price, shipping etc, contact off list.
73 Bob W7LRD
Seattle
--
"if this were easy, everyone would be doing it"
------------------------------
Message: 4
Date: Sat, 31 May 2008 08:59:20 +1000
From: Tony Langdon <vk3jed(AT)gmail.com>
Subject: [amsat-bb] Re: Shuttle question
To: Edward Cole <kl7uw(AT)acsalaska.net>, AMSAT-BB <AMSAT-BB(AT)amsat.org>
Message-ID: <484086d1.08b38c0a.40ec.5164(AT)mx.google.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 12:15 AM 5/31/2008, Edward Cole wrote:
>Once you total the costs it may actually be cheaper to build a new
>satellite and launch it!
>Back the effort for P3E and Eagle/P4.
That too, yes, a new bird would be the easiest approach
indeed. Still, as I said, it was interesting contemplating how such
a recovery might be achieved with today's technology. :)
73 de VK3JED
http://vkradio.com
------------------------------
Message: 5
Date: Sat, 31 May 2008 09:10:05 +1000
From: Tony Langdon <vk3jed(AT)gmail.com>
Subject: [amsat-bb] Re: Re grizzles
To: bruninga(AT)usna.edu, <amsat-bb(AT)amsat.org>
Message-ID: <48408957.09ed720a.1fab.4dde(AT)mx.google.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 01:29 AM 5/31/2008, Robert Bruninga wrote:
> > I learn that the most unfascinating thing
> > to the overwhelming majority is LEO satellites.
>
>Me thinks you skews the facts.
>
>If it is so "unfascinating", why is it the most popular mode?
Well, for me, the LEOs are interesting to play with, FM or SSB. SSB
does take extra skill with Doppler correction and the like. However,
due to subtle lifestyle changes over the years, I do find it more
difficult to get out for the specific 10-15 minutes required to work
a pass, and I have to resurrect my satellite antenna (just a little
mechanical work required there).
However, in this part of the world, the number of countries workable
on a LEO can be counted on 2 hands. The number that actually have
the necessary gear (70cm is a real challenge), well they will fit on
one hand. I've managed to work VK (1-9), ZL and P29 on LEO FM. 3D2
has been worked by others, but I never got to work them myself. Long
distances and the lack of UHF gear on the islands really hurts DX
opportunities. At the time I was most active, 10 metres was active,
and I was able to talk to some of the Pacific islanders about
satellite operation, and that's when I discovered the lack of 70cm
out there. Still, FM is fun in its own way, especially when you try
combining it with being in unusual situations, or mobile in remote areas.
As for the linear birds, RS-10 was fun in the early 90's, worked a
few on there. I didn't have as much luck with RS-12/13 (only QSOs I
had there were pre-arranged), and I never had 70cm SSB to work the
Fujis (or more recently, VO-52).
I haven't had the pleasure of working a HEO, but when one does
appear, I'd like to give it a shot.
73 de VK3JED
http://vkradio.com
------------------------------
Message: 6
Date: Fri, 30 May 2008 22:28:03 -0500
From: "George Henry" <ka3hsw(AT)earthlink.net>
Subject: [amsat-bb] Re: SATPC32 version 12.8 SuM glitch?
To: "amsat bb" <amsat-bb(AT)amsat.org>
Message-ID: <002701c8c2ce$5611d580$0400a8c0(AT)parents>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
SuM seems to run just fine on my laptop, except that ServerFODTrack doesn't
close when I shut down SuM, and I had to use Task Manager to close it. Will
try closing the rotor server first, then SuM, and see what happens. (laptop
is at the office...)
73,
George, KA3HSW
----- Original Message -----
From: "Alan P. Biddle" <APBIDDLE(AT)UNITED.NET>
To: "AMSAT-BB" <amsat-bb(AT)amsat.org>
Sent: Thursday, May 29, 2008 4:00 PM
Subject: [amsat-bb] SATPC32 version 12.8 SuM glitch?
> Hi,
>
> I have been working through the new 12.8 version, and so far everything is
> working perfectly, with one possible exception. When I start the SuM
> program, I get an error message, "datei nicht gefunden" (Data not found).
> When I clear the error message, SuM runs, but the data is clearly not for
> my
> QTH. The SuMListen program works fine, and the data is consistent with
> another program known to be correct.
>
> Could someone with version 12.8 installed try the SuM program and see what
> you get? I am not a moon bounce person, so my interest is purely
> academic.
>
>
> Alan
> WA4SCA
------------------------------
Message: 7
Date: Fri, 30 May 2008 23:29:00 -0500
From: "John P. Toscano" <tosca005(AT)tc.umn.edu>
Subject: [amsat-bb] Re: Test Gear for 1.2/2.4Ghz Equipment
To: John Henderson N4NAB <jah(AT)ec.rr.com>
Cc: AMSAT-BB(AT)amsat.org
Message-ID: <4840D40C.8050903(AT)tc.umn.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
John Henderson N4NAB wrote:
> Need some advice on test gear, signal source, swr measurement for L and S
> band. Just got 1.2 board for 910H and have unit on order for 2.4 from SSB.
> Home brewing antennas and need some way to check/adjust. My MFJ is only good
> for up thru 70cm.
You might want to consider some surplus HP equipment.
The HP432a power meter will cover any frequency you are likely to need.
It requires the additional purchase of a thermistor head. The 478A head
is good to 11 GHz, and 8478B head is good from 10 MHz to 18 GHz. You
also need the thermistor cable.
This setup covers a power range of 10 microwatts to 10 milliwatts full
scale. So you would also want a few precision attenuators so that you
can measure power levels higher than 10 mW without destroying the
thermistor head. A -30dB, 10 watt attenuator would bring a 10 watt
signal down to 10 mW, or full-scale at the maximum power range of this
gear. I also found a -40dB, 50 watt attenuator that brings 50 watts
down to 5 mW or half the power rating of the thermistor. If you were
brave (or foolish) you could put 100 watts through this attenuator very
briefly and the thermistor would be happy at 10 mW maximum. But
precision attenuators don't retain their precision qualities if
overheated with excessive power, so go easy there.
Now, this still doesn't get you the ability to measure SWR, or measure
forward and reflected power into/out of an antenna. To do that, you need
one more piece, which is a directional coupler. Power goes into the
directional coupler and its output is connected to the antenna or other
device under test (DUT). You connect your power meter's thermistor to
the forward or reflected coupling port. By measuring forward and
reflected power, you can determine the SWR.
Sure, the Bird 43 wattmeter is convenient -- power in one side, antenna
connects to the other side, and you can read the SWR right off the main
dial. The "problem" with the Bird is that you have to buy additional
"slugs" for every frequency band and every power level of interest. With
the HP system described above, you only need one meter, one cable, and
one thermistor to measure power at any frequency between 10 MHz and
either 11 or 18 GHz. Although some precision attenuators are frequency
specific, you can easily buy only attenuators rated to 18 GHz and you
are good for any frequency that the meter can measure. Likewise,
directional couplers have highest precision at specified ranges of
frequencies, but in many cases, you can calibrate one with the above
setup plus a good 50 ohm dummy load. By calibrate I mean that if the
dummy load is near 1:1 SWR, the forward power coming out of the coupler
at the frequency of interest can be easily measured with the dummy load
on the output, and you now know what the coupling level of the forward
port is, whether -10dB, -30dB, -16.2dB, or whatever it turns out to be.
Then you physically rotate the device (put power into the output port,
put the dummy load on the input port, and measure the forward power
coming out of the "reverse" coupler port). Now, even though the coupler
might not have been designed to work at 2400 MHz, if the coupling is
measured in this way, the coupler is usable unless the coupling you
measure is extremely poor.
That may be a bit more of an answer than you were looking for. But this
setup seems to be much more versatile to me than a Bird 43 with a box
full of slugs. I actually bought a couple of HP432a meters, thermistor
cables, and 8478B thermistor heads, and 18 GHz attenuators of -10, -20,
-30, and -40 dB, plus a two-way directional coupler. With these pieces,
I can measure power from microwatt levels to tens of watt levels at any
frequency for which I have equipment, as well as forward/reflected power
and (indirectly) SWR. No, I don't have any 24 GHz equipment and this
setup would not test it if I did, but you'll not find a 24 GHz slug for
a Bird 43 either! On the other hand, it is possible to buy a K486A
waveguide thermistor for the 432A and measure 18 to 26.5 GHz too!
If you're interested, the following HP/Agilent operator's manual for the
432A would be a good place to start reading:
http://cp.literature.agilent.com/litweb/pdf/00432-90079.pdf
73 de W?JT
AMSAT-NA LM#2292
------------------------------
Message: 8
Date: Sat, 31 May 2008 05:18:40 -0000
From: "Joe Westbrook" <k7zt(AT)suddenlink.net>
Subject: [amsat-bb] Re: JUBILEE and other frustrations,
To: "i8cvs" <domenico.i8cvs(AT)tin.it>, "Bob Bruninga"
<bruninga(AT)usna.edu>, "AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <004401c8c2de$60002690$030ba8c0(AT)RadioRoom>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Folks:
Is it too much to ask for just a little bit of accountability for projects
that exist as a result of public donations? If any organization can't do
that then they shouldn't solicit donations. It is really a very simple
concept. One shouldn't get their head snapped off just for asking the
question about the status of a given satellite project!
BTW: What is the latest status on PE3?
For Christ Sake LIGHTEN UP! Either it is a viable project or it isn't.
If benchmarks and milestones were applied to the project and they were made
TRULY public undoubtly donations would go through the roof! .
Most folks on this board got a taste of the early RS Satellites, AO-10 and
AO-40 and got a great deal of satisfaction from working those. I"m
confident that if the people on this board were to vote, most would vote for
HEOs. with linear transponders and not in airborne FM Repeaters. NEWS
FLASH it ain't rocket science!
Please get off of your self righteous high horses. most of us don't have the
luxury of working in the satellite field on a daily basis.
Finally I will support any project that is dedicated to getting the first
HEO with linear transponders deployed as long as the leadership is result
oriented and devoted to accontability. Is that really too much to ask from
ANY orgnization? Even my local Amateur Radio Club can manage that!
One final note, we can work repeaters any time on 146.340 / 94 if we wanted
to.
10-4 good buddy!
dos centavos
.73's
DE, Joe, K7ZT
----- Original Message -----
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
To: "Bob Bruninga" <bruninga(AT)usna.edu>; "AMSAT-BB" <amsat-bb(AT)amsat.org>
Sent: Friday, May 30, 2008 1:25 AM
Subject: [amsat-bb] Re: JUBILEE and other frustrations,
> ----- Original Message -----
> From: "Robert Bruninga" <bruninga(AT)usna.edu>
> To: <amsat-bb(AT)amsat.org>
> Sent: Thursday, May 29, 2008 4:00 PM
> Subject: [amsat-bb] Re: JUBILEE and other frustrations
>
>> > There seems to be a proliferation of satellites
>> > using the Amateur bands as cheap down links,
>> > and using Radio Amateurs as a cheap way of
>> > collecting their data. It is MY personal belief
>> > that a satellite should only use our hard-earned
>> > and much coveted frequencies if they REALLY do
>> > carry an Amateur Radio payload... I.E.
>> > a Transponder!
>>
>> While I too like to see transponders, I do not like to see all
>> the negativizim, hate and rabble-rousing against those who
>> actually get something into space. The self-richeous nay-saying
>> comments are about as practical as these:
>>
>> "Those HF contesters should not be using the Amateur Bands, they
>> should be passing useful communications or traffic!"
>>
>> "Those Traffic passers are not real amateur operators, because
>> they will not respond with QSL's!"
>>
>> "Those old fud rag chewers on HF think they own the frequency.
>> They should let others use the frequency for more useful
>> communications"
>>
>> "Those FM commuters are just wasting air time, saying the same
>> old thing every day. Why don't they just use a cell phone!"
>>
>> "Those AM guys are just wasting 6 KHz of spectrum, they should
>> be made illegal on the amateur bands"
>>
>> "Who wants to look at all those SSTV pictures, Its just the
>> same old post-card! They should not be using 3 KHz of bandwidth
>> for such stupid applications"...
>>
>> "Those Winlink guys are killing amateur radio by turning the
>> bands into an automatic communications system."
>>
>> "Those Echolink and IRLP links are bad for ham radio. Why don't
>> they just use HF or a phone if they want to talk to someone far
>> away."
>>
>> "Those Radio control Airplanes operating on the Amateur band
>> should never be there, they are not communications".
>>
>> "Those experimental Balloons just transmit pictures and
>> telemetry, without a transponder, they have no purpose in
>> Amateur Radio"
>>
>> And on and on...
>>
>> Face, it.. Ham radio is as rich in applications as there are
>> innovative and resourceful people. If you want something done,
>> then go do it. If you don't like what others are doing with
>> their hobby, then get out of the way.
>>
>> Public negativizim and constant complaining never accomplishes
>> anything except darken our collective hobby. Save that for the
>> politicians who are supposed to respond to their constituents.
>> For a hobby that is just the collective "us" with each licensed
>> individual having the same equal opportunities as everyone else,
>> complaining about what others do is just pointless.
>>
>> Bob, WB4APR
>>
>
> Hi Bob, WB4APR
>
> You cannot get out of the way those Amateur Radio users actually
> requesting
> OSCAR's Satellites with on board transponders because the Amateur
> Satellite
> Service started when in 1972 OSCAR-6 was launched and thousand's of the
> above maltreated and by you offended HF users decided to abandone the
> Amateur Service to enter into a more bright and promising Amateur
> Satellite
> Service.
> The above thousand's HF users invested worldwide a lot of money and a lot
> of efforts to convert their HF stations into VHF/UHF/SHF Satellite
> Stations
> with the purpose to get a more communication efficiency against the
> problems
> due of propagation using short waves.
> Without the above prerequisite the Amateur Satellite Service never would
> had spring up.
>
> Read please this "Brief History" written into page-1 of the AMSAT-UK
> OSCAR-13 Operations and Technical Handbook 1989
>
> "Amateur radio satellites have gone through three phases; phase 1:
> experimentation to find the possible; phase 2: long life, low orbit
> satellites to gain experience; and phase 3: high altitude orbits with
> complex transponding and control systems.
>
> Phase 1 started when OSCAR-1 was launched on 12 December 1961 and phase 2
> was led by OSCAR-6 in October 1972. Amsat's first attemp for phase 3 (the
> satellite known only as phase 3A ) failed when the experimental Ariane
> rocked plunged into the South Atlantic in May 1980 . Amsat second attemp
> for phase 3 partially succeeded in June 1993 when OSCAR-10 was released
> into space . The world's radio amateurs after more than 10 years of low
> orbit satellites and associated short visibility periods, at last tasted
> Amsat's policy of equivalence to a permantly open 14 MHz band with
> practically world wide communications.
>
> OSCAR stands for Orbital Satellite Carrying Amateur Radio and a satellite
> is
> a package equipped with solar cells, batteries, receivers, and
> transmitters,
> aerials and control electronics.
> The batteries are charged by the solar cells whenever the satellite is in
> sunlight.
> Signal received in part of one amateur band are retransmitted in part of
> another amateur band.
> Unlike terrestrial, single frequency, analog repeaters ,the satellite
> relay
> system (called a transponder ) will translate linearly any type of
> narrow-band signal such as CW, SSB, RTTY, NBFM, or AM although only
> the first four are recommended, being power-efficient and RF low duty
> cycle
> --------------------
> Bob,
> This is why the above thousands Satellite Experimenter's and User's
> mostly coming from the HF are actually waiting for P3-E and her
> transponders. Read again please:
>
> ".................when OSCAR-10 was released into space . The world's
> radio
> amateurs after more than 10 years of low orbit satellites and associated
> short visibility periods, at last tasted Amsat's policy of equivalence to
> a
> permanently open 14 MHz band with practically world wide communications."
>
> I hope that the original unchanged AMSAT's policy will be now clear for
> you.
>
> 73" de
>
> i8CVS Domenico
> Past President
> AMSAT-Italia
>
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)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
>
------------------------------
Message: 9
Date: Sat, 31 May 2008 02:38:18 -0400
From: dobarrows(AT)aol.com
Subject: [amsat-bb] RS-30
To: amsat-bb(AT)amsat.org
Message-ID: <8CA91000C2EC61F-E30-1547(AT)webmail-me07.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
I am looking for RS-30 keps. I couldn't find RS-30, but I could find
keps for 32957U on Celestrak new launches with another name. Is this
the correct set? -- de W8IJ
------------------------------
Message: 10
Date: Sat, 31 May 2008 16:53:05 +0900
From: Mineo Wakita <ei7m-wkt(AT)asahi-net.or.jp>
Subject: [amsat-bb] Re: RS-30
To: amsat-bb(AT)amsat.org
Message-ID: <63C8C2F35C2877ei7m-wkt(AT)asahi-net.or.jp>
Content-Type: text/plain; charset=us-ascii
In Space-Track:
32953 YUBILEINY 2008-025A CIS 2008-05-23
------------------------------
Message: 11
Date: Fri, 30 May 2008 22:46:49 -0400
From: "Piyumi Perera" <ve4wpl(AT)mts.net>
Subject: [amsat-bb] My first satellite contact
To: <amsat-bb(AT)amsat.org>
Message-ID: <000a01c8c2c8$9356dbd0$9503fea9(AT)selfdq4gtesax7>
Content-Type: text/plain; charset="iso-8859-1"
Hi to the BB,
My name is Piyumi Perera and I am a 10 year old YL living in Winnipeg,
Manitoba, Canada. Today I was so excited because I made my first satellite
contact on AO-51 at 00:52 UTC. It was an even more special contact for me as
the station was from Alaska, KL7XJ.
I used an Icom IC-W32A handheld at 5 watts with an Arrow antenna.
I thank KL7XJ for making my first satellite contact possible. It was a lot of
fun, and hope to make more satellite contacts in the future.
73,
Piyumi Perera VE4WPL - EN19
------------------------------
Message: 12
Date: Sat, 31 May 2008 04:40:50 EDT
From: G0MRF(AT)aol.com
Subject: [amsat-bb] New satellies / Shuttle question
To: vk3jed(AT)gmail.com, amsat-bb(AT)amsat.org
Message-ID: <c66.343e94f4.35726912(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
Hi Edward / group.
Most current construction or feasility study is centered on P3E / Eagle /
Intelsat /HEO where launch opportunities are rare and costs are high.
Perhaps we should look at this problem from another viewpoint. Start with
what launch opportunities AMSAT can afford and then retake the technology
initative and investigate what minaturised payloads can we launch for that
price?
For example. Imagine a 2 or 3U cubesat type structure, or even one half the
size of AO-51 on last weeks Russian launch to 1500km. With payloads reduced
to transponders and a basic onboard computer and an Electrical Power System,
it would be feasable to put RF comms equipment into a decent orbit on 29MHz
145MHz 435MHz with an RX on 1269.
For bands higher than 13cm doppler is a problem and path loss is quite high.
It may not be possible to provide the necessary DC power for transmitters
in a small structure.
Talking of DC power, the number of cubesats that fail due to power problems
is huge. The answer is to get inventive with deployable solar arrays. With
the engineering excellence AMSAT possesses it should not be impossible to
arrange a structure where the entire outer layer contains extra solar cells
that
are deployed after seperation from the launcher. Imagine a 3U cube which in
orbit becomes a 3U box of electronics covered in cells, with an extended
outer
3U shell that deploys forming a 6U structure producing nearly double the DC
power. The 6U structure also makes antenna design easier
For a slightly more risky idea.....small satellite propulsion. Again,
perhaps 3U cube, with the last section comprising a small motor. A single burn
unit could provide a really nice elliptical LEO orbit, perhaps 680km to
2000km.
Wouldn't that be interesting. I notice that there is an Austrian university
team who have developed a cubesat sized ion propulsion system asking if
anyone would like to try it. So, while this may initially seem a 'wild idea'
it
is based on technology that is very nearly a reality.
Worth investigating?
David G0MRF
In a message dated 30/05/2008 23:22:37 GMT Standard Time, vk3jed(AT)gmail.com
writes:
At 12:15 AM 5/31/2008, Edward Cole wrote:
>Once you total the costs it may actually be cheaper to build a new
>satellite and launch it!
>Back the effort for P3E and Eagle/P4.
That too, yes, a new bird would be the easiest approach
indeed. Still, as I said, it was interesting contemplating how such
a recovery might be achieved with today's technology. :)
73 de VK3JED
------------------------------
Message: 13
Date: Sat, 31 May 2008 11:30:15 +0200
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
Subject: [amsat-bb] Re: RS-30
To: <dobarrows(AT)aol.com>, <amsat-bb(AT)amsat.org>
Message-ID: <000301c8c300$eee6f970$ccb4ec50$(AT)de>
Content-Type: text/plain; charset="iso-8859-1"
RS-30
1 32953U 08025A 08150.97764288 .00000010 00000-0 00000+0 0 173
2 32953 082.5019 134.9062 0017621 298.2129 061.7164 12.42997340 785
73, Mike
DK3WN
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] Im
Auftrag von dobarrows(AT)aol.com
Gesendet: Samstag, 31. Mai 2008 08:38
An: amsat-bb(AT)amsat.org
Betreff: [amsat-bb] RS-30
I am looking for RS-30 keps. I couldn't find RS-30, but I could find
keps for 32957U on Celestrak new launches with another name. Is this
the correct set? -- de W8IJ
_______________________________________________
Sent via AMSAT-BB(AT)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
------------------------------
Message: 14
Date: Sat, 31 May 2008 05:24:13 -0400
From: "Mark L. Hammond" <n8mh(AT)embarqmail.com>
Subject: [amsat-bb] Re: Test Gear for 1.2/2.4Ghz Equipment
To: "John Henderson" <jah(AT)ec.rr.com>, amsat-bb(AT)amsat.org
Message-ID: <F5.B0.23833.E3911484(AT)smtp08.embarq.synacor.com>
Content-Type: text/plain; charset="us-ascii"
Hey John!
For monitoring 1.2GHz transmissions (power out, SWR) I can highly recommend
the Diamond SX-1000. It's a nice meter for the price. Look it up online; one
of the many nice features is 2 radio inputs and the ability to switch between
them.
For a 2.4G signal source--search for the board designed by G0MRF. It's a nice
signal generator to make sure the 2.4GHz receiving system is working. I
bought one of these a while ago and have appreciated having it handy many
times.
Hope that info helps! Glad to see you moving towards L and S band ops :)
73,
Mark L. Hammond [N8MH]
------------------------------
Message: 15
Date: Sat, 31 May 2008 19:51:11 +0900
From: Mineo Wakita <ei7m-wkt(AT)asahi-net.or.jp>
Subject: [amsat-bb] Re: RS-30 APT
To: amsat-bb(AT)amsat.org
Message-ID: <64C8C30C3D758Dei7m-wkt(AT)asahi-net.or.jp>
Content-Type: text/plain; charset=iso-2022-jp
1. Download rm.file from DK3WN
http://www.dk3wn.info/sat/afu/sat_rs30.shtml
2. Convert to WAV.file' from rm. file
3. Convert to 16bit/monaural/11KHz from 16bit/stereo/44KHz
4. WXtoImg ? File ? Open Audio File
http://www.ne.jp/asahi/hamradio/je9pel/rs30_dat2.jpg
------------------------------
_______________________________________________
Sent via amsat-bb(AT)amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 3, Issue 275
****************************************
Read previous mail | Read next mail
| |
