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CX2SA > SATDIG 28.07.08 06:00l 1446 Lines 42850 Bytes #999 (0) @ WW
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Path: IZ3LSV<IK2XDE<IS0FLO<CX2SA
Sent: 080728/0354Z @:CX2SA.LAV.URY.SA #:21604 [Minas] FBB7.00e $:21604_CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. LEO launch? (w7lrd(AT)comcast.net)
2. Re: Dish surface 'flatness' (i8cvs)
3. Re: FO-29 telemetry (i8cvs)
4. Re: LEO launch? (G0MRF(AT)aol.com)
5. Re: Delfi C3 transponder frequencies ? (Alan Cresswell)
6. Re: FO-29 telemetry (Mike Rupprecht)
7. Re: VHF UHF Rig (Robert Bruninga)
8. Re: Delfi C3 transponder frequencies ? (Alan Cresswell)
9. Re: FO-29 telemetry (i8cvs)
10. Fox Delta ST3 problem (morry(AT)tekinnovations.com.au)
11. Re: FO-29 telemetry (SV1BSX)
----------------------------------------------------------------------
Message: 1
Date: Sun, 27 Jul 2008 19:15:27 +0000
From: w7lrd(AT)comcast.net
Subject: [amsat-bb] LEO launch?
To: AMSAT-BB(AT)amsat.org (AMSAT-BB)
Message-ID:
<072720081915.27836.488CC94F00082A3900006CBC22165258560B9D04C999(AT)comc
ast.net>
Content-Type: text/plain
Near the end of this article they mention a LEO launch vehicle. Something to
think about!
http://www.comcast.net/articles/news-science/20080726/TEC.Space.Tourism/
73 Bob W7LRD
Seattle
--
"if this were easy, everyone would be doing it"
------------------------------
Message: 2
Date: Sun, 27 Jul 2008 21:25:39 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: Dish surface 'flatness'
To: <vk1kep(AT)gmail.com>, "AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <002f01c8f01e$9114be40$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Peter Ellis" <vk1kep(AT)gmail.com>
To: <amsat-bb(AT)amsat.org>
Sent: Saturday, July 26, 2008 12:00 AM
Subject: [amsat-bb] Dish surface 'flatness'
> I am now the proud owner of a very 'second-hand' 3m mesh-covered
> skeleton dish.
>
> The mesh covering is metaphorical, rather than actual. I watched the
> dish on its back while as a group of small children rolled the dish back
> and forth and trampled holes in the mesh. That's the reason I was able
> to ask for it. "Please take it away," was the manager's reply to my query.
>
> Now, I need to re-mesh the dish, but I need to decide what 'flatness'
> ('true-ness') the surface should be. There has to be a formula, that
> encompasses things like: frequency of operation, curvature or focus
> distance, etc.
>
> I've done some looking online, but can't find it readily.
>
> Suggestions, and discussion, please?
>
> Please note: If you're going to also make product, brand name, or
> supplier suggestions, then be generic as suppliers and products in VK
> (Australia) will differ from where most list members will be sited.
>
> With thanks,
> Peter
> VK1KEP
Hi Peter, VK1KEP
To answere your question I have sent to you in two separate email the
TECHNICAL REPORT # 5 of the Crawford Hill VHF Club - W2NFA
with the following subject:
"A PARABOLOIDAL REFLECTOR ANTENNA FOR 1296 MHz"
This paper covers the following matter :
Basic Designe Considerations
Feed Antenna
The Parabolic Reflector - Error Tolerances
Surfacing Material
Paraboloidal Construction
Bandwidth
Radiation Pattern
Maximum Gain
Phase Center
Noise Temperature
Polarization
The above article is currently used by all EME'rs and was written with
the contribution of many authors of the Crawford Hill VHF Club - W2NFA
The article is 10 pages long and it was necessary to divide it into two
zipped files each about 2 MB long
If some other people is interested on it pleas let me know
Best 73" de
i8CVS Domenico
------------------------------
Message: 3
Date: Sun, 27 Jul 2008 21:44:58 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: FO-29 telemetry
To: "'AMSAT-BB'" <amsat-bb(AT)AMSAT.Org>, "Mike Rupprecht"
<mail(AT)mike-rupprecht.de>
Cc: Francesco Grappi <f.grappi(AT)vodafone.it>
Message-ID: <007801c8f021$4112d780$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
Hi Mike, DK3WN
Tank you very much to decode the FO-29 telemetry. It seems that
all parameters are nominal and the batteries are charging but it should
be necessary to compare the actual performance with some old telemetry
file that you probably have available in your archive.
Please let us know
Tanks and 73" de
i8CVS Domenico
----- Original Message -----
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
To: "'AMSAT-BB'" <amsat-bb(AT)AMSAT.Org>
Sent: Sunday, July 27, 2008 4:34 PM
Subject: [amsat-bb] FO-29 telemetry
> Hi all,
>
> FO-29 CW telemetry at 1210 UTC, July 27th
>
> 1210 UTC
> hihi 22e288d58f050525002401016a629695b07bb9b4babcb7
> hihi 22e288d58f050525002401016b629695b076b9b4babcb7
> hihi 22e288d58f050525002401017f629594b077b8b4babbb7
> hihi 22e288d58f0505250024010183629595b19eb8b4babbb7
> hihi 22e288d58f0505250024010184629594b165b8b4babbb7
> hihi 22e288d58f0505250024010186629695b075b8b4b9bbb7
> hihi 22e288d58f0505250024010182629595b054b7b3b9bab7
> hihi 22e288d58f050525002401017c629594b09bb7b3b9bab7
>
> Solar Current 1313.7 [mA]
> Battery Current 79.2 [mA]
> Battery Voltage 16.1 [V]
> Middle Voltage 7.2 [V]
> Bus Voltage 17.3 [V]
> JTA Tx Power 662.4 [mW]
> Structure1 Temp 10.4 [C]
> Structure2 Temp 12.0 [C]
> Structure3 Temp 10.0 [C]
> Structure4 Temp 9.3 [C]
> Battery Cell Temp 10.8 [C]
>
> 73, Mike
> DK3WN
>
>
>
>
>
> Von: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] Im
> Auftrag von i8cvs
> Gesendet: Sonntag, 27. Juli 2008 06:08
> An: AMSAT-BB
> Cc: Francesco Grappi
> Betreff: [amsat-bb] FO-29 is alive and well
>
> Hi All,
>
> Following suggestions of my friend Mak, SV1BSX I tried FO-29 this
> night 27 july during the South bound orbit 58978 when the AOS for me
> in JN70ES was at 00:06 UTC and FO-29 was in sun light.
>
> I was alone into the passband and my return signal was very strong above
> my noise floor with appoximately only 10 watt on a 13 dBi crossed yagi
> RHCP / LHCP (about 200 watt EIRP)
>
> The SSB return was very clean and without FMing with the usual need to
> switch RHCP to LHCP time to time to get the best signal strength
>
> At 00:15 UTC FO-29 started to experience the eclipse as per InstanTrack
> but no signe of reduction of my return signal or FMing was noted.
>
> >From 00:15 to 00:21 until my LOS the satellite was over Africa and well
> in full eclipse for about 6 minutes but my own return signal was still
clear
> ad strong without any signe of FMing so that it seems that the battery are
> working and as far I know the satellite performance seems to be nominal.
>
> The CW beacon was ON all the time but it should be necessary to
> decode the TLM to get the actual parameters ( I think IW4DVZ can do
> the job with his suitable software )
>
> The transponder is very sensitive as it was as new so that refrain please
> to use high power because 200 watt EIRP is more than necessary.
>
> I tanks very much Mak SV1BSX for sending to me the results of his
> experience yesterday confirming the results that I got this night both
> confirming that FO-29 seems to be alive and well.
>
> We don't know what JARL did to resurrex this beautiful satellite but
> until she will last we have another real CW and SSB satellite to work.
>
> Congratulations to JARL
>
> 73" de
>
> i8CVS Domenico
------------------------------
Message: 4
Date: Sun, 27 Jul 2008 15:56:57 EDT
From: G0MRF(AT)aol.com
Subject: [amsat-bb] Re: LEO launch?
To: w7lrd(AT)comcast.net, amsat-bb(AT)amsat.org
Message-ID: <c78.38940d2d.35be2d09(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
In a message dated 27/07/2008 19:32:26 GMT Standard Time, w7lrd(AT)comcast.net
writes:
Near the end of this article they mention a LEO launch vehicle. Something
to think about!
http://www.comcast.net/articles/news-science/20080726/TEC.Space.Tourism/
73 Bob W7LRD
Seattle
Hi Bob.
Sadly I think the general approach to Virgin Galactic's space tourism is
incompaible with small satellites as we know them.
The Virgin / Rutan plan takes people into space, but with zero relative
velocity to the earth. This means that gravity will cause their spaceship 2
and
any satellite to fall straight back down.
To achieve orbit, the satellite would need propulsion capable of generating
about 18,000 miles per hour of 'horizontal' motion + a bit more altitude would
be nice too. Easier than launching from the earth. No friction from the
atmosphere, but still a very difficult task.
73
David
------------------------------
Message: 5
Date: Sun, 27 Jul 2008 20:26:03 -0000
From: "Alan Cresswell" <alancresswell(AT)xtra.co.nz>
Subject: [amsat-bb] Re: Delfi C3 transponder frequencies ?
To: "'AMSAT-BB'" <amsat-bb(AT)amsat.org>
Message-ID: <000f01c8f026$fea2ba40$0401010a(AT)Dell1>
Content-Type: text/plain; charset="us-ascii"
Hi all,
On the one good pass over ZL so far I had to use a +6kHz offset on my uplink
to receive on the nominal downlink frequency.
i.e. satellite input frequency of 535.556 (nominal 435.550) to hit the
145.900 satellite output frequency.
Alan
ZL2BX
-----Original Message-----
From: amsat-bb-bounces(AT)AMSAT.Org [mailto:amsat-bb-bounces(AT)AMSAT.Org] On
Behalf Of OZ1MY
Sent: Sunday, 27 July 2008 09:57
To: AMSAT-BB
Subject: [amsat-bb] Delfi C3 transponder frequencies ?
Hi all,
The transponder was working at the pass with AOS at
0926 UTC here in Copenhagen.
Had a couple of QSOs with HA2RD and PE1ITR.
As far as I can make out the frequencies are different
from the published ones.
Just after the transponder was turned on I har to go
to an uplink of 435.565 MHz to get 145.900 MHz down.
This is the nominal pair I used in SatPC32.
After some time had to adjust the uplink down to
435.563 MHz.
Can someone confirm this ?
73 OZ1MY
Ib
_______________________________________________
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: 6
Date: Sun, 27 Jul 2008 22:27:23 +0200
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
Subject: [amsat-bb] Re: FO-29 telemetry
To: "'i8cvs'" <domenico.i8cvs(AT)tin.it>, "'AMSAT-BB'"
<amsat-bb(AT)AMSAT.Org>
Message-ID: <003d01c8f027$2dc8e330$895aa990$(AT)de>
Content-Type: text/plain; charset="iso-8859-1"
Hi Domenico,
My last FO-29 telemetry was received on Feb 17, 2006 at 1614 UTC
hi hi a6 03 88 d5 8f f3 05 25 00 24 8c 36 63 51 86 83 8f 57 86 84 87 86 7b
Solar Current 970.6 [mA]
Battery Current 412.4 [mA]
Battery Voltage 14.4 [V]
Middle Voltage 6.3 [V]
Bus Voltage 14.0 [V]
JTA Tx Power 467.4 [mW]
Structure1 Temp 29.8 [C]
Structure2 Temp 30.6 [C]
Structure3 Temp 29.5 [C]
Structure4 Temp 29.8 [C]
Battery Cell Temp 34.1 [C]
73, Mike
-----Urspr?ngliche Nachricht-----
Von: i8cvs [mailto:domenico.i8cvs(AT)tin.it]
Gesendet: Sonntag, 27. Juli 2008 21:45
An: 'AMSAT-BB'; Mike Rupprecht
Cc: Francesco Grappi; sv1bsx(AT)yahoo.gr
Betreff: Re: [amsat-bb] FO-29 telemetry
Hi Mike, DK3WN
Tank you very much to decode the FO-29 telemetry. It seems that
all parameters are nominal and the batteries are charging but it should
be necessary to compare the actual performance with some old telemetry
file that you probably have available in your archive.
Please let us know
Tanks and 73" de
i8CVS Domenico
----- Original Message -----
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
To: "'AMSAT-BB'" <amsat-bb(AT)AMSAT.Org>
Sent: Sunday, July 27, 2008 4:34 PM
Subject: [amsat-bb] FO-29 telemetry
> Hi all,
>
> FO-29 CW telemetry at 1210 UTC, July 27th
>
> 1210 UTC
> hihi 22e288d58f050525002401016a629695b07bb9b4babcb7
> hihi 22e288d58f050525002401016b629695b076b9b4babcb7
> hihi 22e288d58f050525002401017f629594b077b8b4babbb7
> hihi 22e288d58f0505250024010183629595b19eb8b4babbb7
> hihi 22e288d58f0505250024010184629594b165b8b4babbb7
> hihi 22e288d58f0505250024010186629695b075b8b4b9bbb7
> hihi 22e288d58f0505250024010182629595b054b7b3b9bab7
> hihi 22e288d58f050525002401017c629594b09bb7b3b9bab7
>
> Solar Current 1313.7 [mA]
> Battery Current 79.2 [mA]
> Battery Voltage 16.1 [V]
> Middle Voltage 7.2 [V]
> Bus Voltage 17.3 [V]
> JTA Tx Power 662.4 [mW]
> Structure1 Temp 10.4 [C]
> Structure2 Temp 12.0 [C]
> Structure3 Temp 10.0 [C]
> Structure4 Temp 9.3 [C]
> Battery Cell Temp 10.8 [C]
>
> 73, Mike
> DK3WN
>
>
>
>
>
> Von: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] Im
> Auftrag von i8cvs
> Gesendet: Sonntag, 27. Juli 2008 06:08
> An: AMSAT-BB
> Cc: Francesco Grappi
> Betreff: [amsat-bb] FO-29 is alive and well
>
> Hi All,
>
> Following suggestions of my friend Mak, SV1BSX I tried FO-29 this
> night 27 july during the South bound orbit 58978 when the AOS for me
> in JN70ES was at 00:06 UTC and FO-29 was in sun light.
>
> I was alone into the passband and my return signal was very strong above
> my noise floor with appoximately only 10 watt on a 13 dBi crossed yagi
> RHCP / LHCP (about 200 watt EIRP)
>
> The SSB return was very clean and without FMing with the usual need to
> switch RHCP to LHCP time to time to get the best signal strength
>
> At 00:15 UTC FO-29 started to experience the eclipse as per InstanTrack
> but no signe of reduction of my return signal or FMing was noted.
>
> >From 00:15 to 00:21 until my LOS the satellite was over Africa and well
> in full eclipse for about 6 minutes but my own return signal was still
clear
> ad strong without any signe of FMing so that it seems that the battery are
> working and as far I know the satellite performance seems to be nominal.
>
> The CW beacon was ON all the time but it should be necessary to
> decode the TLM to get the actual parameters ( I think IW4DVZ can do
> the job with his suitable software )
>
> The transponder is very sensitive as it was as new so that refrain please
> to use high power because 200 watt EIRP is more than necessary.
>
> I tanks very much Mak SV1BSX for sending to me the results of his
> experience yesterday confirming the results that I got this night both
> confirming that FO-29 seems to be alive and well.
>
> We don't know what JARL did to resurrex this beautiful satellite but
> until she will last we have another real CW and SSB satellite to work.
>
> Congratulations to JARL
>
> 73" de
>
> i8CVS Domenico
------------------------------
Message: 7
Date: Sun, 27 Jul 2008 16:35:18 -0400
From: "Robert Bruninga" <bruninga(AT)usna.edu>
Subject: [amsat-bb] Re: VHF UHF Rig
To: "'Andrew Harris'" <andrew.unit(AT)gmail.com>
Cc: 'AMSAT-BB' <amsat-bb(AT)amsat.org>
Message-ID: <3F997E56553D4F7CA97B787A69D797BA(AT)ewlab.usna.edu>
Content-Type: text/plain; charset="us-ascii"
> Thanks for the info. I actually own a Kenwood
> TH-D7. Is that what you're referring to?
> I was under the impression that the TNC on the
> TH-D7 is permanently crippled and I couldn't
> use it to effectively communicate in both
> directions to a pacsat.
Its all in the Details.....
The TH-D7 TNC works perfectly well... For what it was designed
to do... That is APRS, or other UI packets. The only thing it
has problems with is CONNECTED mode, handing lots of data, at
high throughput, in KISS mode at 9600 baud. IE, using it for
classical PACSAT mode.
But on the other hand, you can use it to digipeat through the
PACSAT all the time with no problems whatsoever. This is APRS
mode, single packet at a time, digipeat using UI packets at 9600
baud. Which, by the way, are more efficient in the task you are
proposing anyway...
Good luck. Bob, WB4APR
>
> -andrew
>
> On Fri, Jul 25, 2008 at 5:55 PM, Robert Bruninga
> <bruninga(AT)usna.edu> wrote:
> >> Is there a radio that is small and lightweight
> >> that I could interface to a computer easily to
> >> receive and transmit packets to AO-51?
> >> I want to use the radio (and the AO-51 pacsat)
> >> as the primary means to communicate with an
> >> ocean-deployed robot.
> >
> > Use any of the APRS radios (D7, D70, D710). They all have
9600
> > baud TNC's built in... Operate in UI digipeat mode assuming
your
> > command/telemetry is sparse and infrequent and not high
volume..
> >
> > Bob, WB4APR
> >
> > Obviously my hand would not
> >> be there to correct for doppler, etc.
> >>
> >> -andrew
> >>
> >> On Fri, Jul 25, 2008 at 12:55 PM, i8cvs
> > <domenico.i8cvs(AT)tin.it> wrote:
> >> > Hi All,
> >> >
> >> > My Kenwood TS-790E has absolutely no "birdies" in 2 m ,70
> >> cm and 23 cm
> >> > and this is why I like it very much.
> >> >
> >> > Tanks very much the OM that sold it to me as used to buy
a
> >> new TS-2000X
> >> > and his "birdies" !
> >> >
> >> > 73" de
> >> >
> >> > i8CVS Domenico
> >> >
> >> > ----- Original Message -----
> >> > From: "John Price" <n4qwf1(AT)gmail.com>
> >> > To: "Andrew Glasbrenner" <glasbrenner(AT)mindspring.com>;
> >> <amsat-bb(AT)amsat.org>
> >> > Sent: Friday, July 25, 2008 4:54 PM
> >> > Subject: [amsat-bb] Re: VHF UHF Rig
> >> >
> >> >
> >> >> My 847 has a number of birdies in the satellite band. I
use
> > a magic
> >> >> notch to silence them. It is
> >> >> not the perfect solution but it works.
> >> >>
> >> >> 73's << John
> >> >>
> >> >> On Fri, Jul 25, 2008 at 10:32 AM, Andrew Glasbrenner
> >> >> <glasbrenner(AT)mindspring.com> wrote:
> >> >> > The TS2000 generates an internal signal (a "birdie")
on
> >> the downlink of
> >> >> > SO-50 and AO-27. This signal overwhelms the satellite
> >> signal in most
> >> > cases,
> >> >> > making it difficult if no impossible to use on those
two
> >> very popular
> >> >> > satellites.
> >> >> >
> >> >> > 73, Drew KO4MA
> >> >> >
> >> >> > ----- Original Message -----
> >> >> > From: "Terry Dillard" <tdillard(AT)gmail.com>
> >> >> > To: <AMSAT-BB(AT)amsat.org>
> >> >> > Sent: Friday, July 25, 2008 9:55 AM
> >> >> > Subject: [amsat-bb] Re: VHF UHF Rig
> >> >> >
> >> >> >
> >> >> >> Pardon my ignorance, but what the heck is a "birdy
> > problem"?
> >> >> >>
> >> >> >> --
> >> >> >> Terry Dillard, KI4YZI
> >> >> >> www.ki4yzi.com
> >> >> >> "Veritas Vos Liberabit"
> >> >> >>
> >> >> >>
> >> >> >> On 7/24/08, Sebastian <w4as(AT)bellsouth.net> wrote:
> >> >> >>>
> >> >> >>> Oh boy, and here I just bought a used dual band
mobile
> >> on the cheap
> >> >> >>> (no transmit) to take care of the birdy problem.
> >> >> >>>
> >> >> >>> Do you have any idea why the birdy would show up on
a
> > different
> >> >> >>> radio? Could it be a matter of a lack of shielding?
> >> It just doesn't
> >> >> >>> make any sense to me why a different rig would get
> >> that interference
> >> >> >>> on receive, and even when using a different antenna.
> >> >> >>>
> >> >> >>> Others have suggested using a preamp on 440, and
> >> turning off the
> >> >> >>> 2000's internal preamp and lowering the rf gain,
> >> therefore using the
> >> >> >>> preamp to get rid of most of the birdy.
> >> >> >>>
> >> >> >>> But I guess I'll find out for sure when my other rig
> > gets here.
> >> >> >>>
> >> >> >>> 73 de W4AS
> >> >> >>> Sebastian
> >> >> >>>
> >> >> >>> On Jul 24, 2008, at 7:00 PM, Bruce Robertson wrote:
> >> >> >>>
> >> >> >>> > On Wed, Jul 23, 2008 at 11:31 PM, Mike Miller
> >> <mmiller(AT)nctc.com>
> >> >> >>> > wrote:
> >> >> >>> >> Thinking about selling 847.....Which rig is best
for
> >> >> >>> >> satellite..work.?
> >> >> >>> >>
> >> >> >>> >> ICOM 910 H
> >> >> >>> >> Kenwood 2000
> >> >> >>> >>
> >> >> >>> >> opinions ....your 2 cents
> >> >> >>> >
> >> >> >>> > I own a TS-2000. The birdie problem on SO-50 and
> >> AO-27 is quite
> >> > real,
> >> >> >>> > and there is no fix I know of. I find that the
> >> birdie is so bad that
> >> >> >>> > even if I use a different receiver on UHF, I pick
up
> >> the birdie on
> >> > it
> >> >> >>> > as well! So it is a worse radio regarding
satellite
> >> work than the
> >> > ICOM
> >> >> >>> > if you care to work these birds. However, if you
> >> consider the fact
> >> >> >>> > that a fine HF radio is thrown in at no extra
cost,
> >> that there is
> >> >> >>> > continuously adjustable filtering also at no cost,
> >> you might prefer
> >> >> >>> > that trade-off. I'm reasonably pleased with mine.
> >> >> >>> >
> >> >> >>> > However, if money were no issue, I would get the
> >> ICOM for satellite
> >> >> >>> > work and a different HF radio with even better
> >> characteristics.
> >> >> >>> >
> >> >> >>> > HTH,
> >> >> >>> >
> >> >> >>> > 73, Bruce
> >> >> >>> > VE9QRP
> >> >> >>>
> >> >> >> _______________________________________________
> >> >> >> 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
> >> >> >
> >> >> > _______________________________________________
> >> >> > 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
> >> >> >
> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> N4QWF Amateur Radio Operator
> >> >> AO-7,AO-27,SO-50,AO-51,VO-52,ISS
> >> >> Internet N4QWF(AT)AMSAT.ORG
> >> >> Echolink nodes #110903 -L #388463
> >> >> Formerly KC4AHW VK3FEZ
> >> >> Amsat Member #27845
> >> >> DXCC #33,478
> >> >> VUCC SAT #135
> >> >> WAS SAT #296
> >> >> 51 on AO-51 #13
> >> >> LON -79.256 LAT 37.459 Grid FM07il
> >> >> >From the Foothills of the Blueridge
> >> >>
> >> >> *Life should not be a journey to the grave with the
> > intention of
> >> >> arriving safely in a pretty and well preserved body, but
> > rather to
> >> >> skid in broadside, thoroughly used up, totally worn out,
> > and loudly
> >> >> proclaiming - "WOW, What a ride!"
> >> >> _______________________________________________
> >> >> 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
> >> >>
> >> >
> >> >
> >> > _______________________________________________
> >> > 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
> >> >
> >> _______________________________________________
> >> 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: 8
Date: Sun, 27 Jul 2008 21:39:46 -0000
From: "Alan Cresswell" <alancresswell(AT)xtra.co.nz>
Subject: [amsat-bb] Re: Delfi C3 transponder frequencies ?
To: "'AMSAT-BB'" <amsat-bb(AT)amsat.org>
Message-ID: <001601c8f031$4ae22ee0$0401010a(AT)Dell1>
Content-Type: text/plain; charset="us-ascii"
Hi David,
The frequencies I indicated were the satellite input/output frequencies as I
saw them here.
My transmit and receive frequencies were those frequencies +/- Doppler
It seemes to me that there is a 6kHz offset within the satellite
transponder.
I presume the Delfi team can tell us what the actual situation is.
Alan
ZL2BX
_____
From: G0MRF(AT)aol.com [mailto:G0MRF(AT)aol.com]
Sent: Sunday, 27 July 2008 21:14
To: alancresswell(AT)xtra.co.nz; oz1my(AT)privat.dk
Subject: Re: [amsat-bb] Re: Delfi C3 transponder frequencies ?
In a message dated 27/07/2008 20:27:18 GMT Standard Time,
alancresswell(AT)xtra.co.nz writes:
Hi all,
On the one good pass over ZL so far I had to use a +6kHz offset on my uplink
to receive on the nominal downlink frequency.
i.e. satellite input frequency of 535.556 (nominal 435.550) to hit the
145.900 satellite output frequency.
Alan
ZL2BX
Hello Alan
Hello Ib
That's quite a spread of frequencies 556 to 565. Was that corrected for
doppler?
I suppose the other possibility is that Alan has been listening towards the
end of the pass when the satellite has reached its maximum temperature and
drift?
This will be interesting to follow!
Sorry not to see you at Surrey this year Ib. Hope everything is OK
Regards
David
------------------------------
Message: 9
Date: Mon, 28 Jul 2008 02:24:51 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: FO-29 telemetry
To: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>, "'AMSAT-BB'"
<amsat-bb(AT)AMSAT.Org>
Message-ID: <008401c8f048$5a013800$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
Hi Mike, DK3WN
Your FO-29 telemetry of Feb, 2006 at 1614 UTC demonstrates that actually
FO-20 is working nominally.
Unfortunately despite the boombing signals there is small activity on this
satellite and to day the only station I have worked in SSB during all the
South-bound and North-bound orbits were Rolf, DK2ZF , SV1JGW, EA3DME
and 2E1EUB
Tanks for your help
73" de
i8CVS Domenico
----- Original Message -----
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
To: "'i8cvs'" <domenico.i8cvs(AT)tin.it>; "'AMSAT-BB'" <amsat-bb(AT)AMSAT.Org>
Sent: Sunday, July 27, 2008 10:27 PM
Subject: AW: [amsat-bb] FO-29 telemetry
Hi Domenico,
My last FO-29 telemetry was received on Feb 17, 2006 at 1614 UTC
hi hi a6 03 88 d5 8f f3 05 25 00 24 8c 36 63 51 86 83 8f 57 86 84 87 86 7b
Solar Current 970.6 [mA]
Battery Current 412.4 [mA]
Battery Voltage 14.4 [V]
Middle Voltage 6.3 [V]
Bus Voltage 14.0 [V]
JTA Tx Power 467.4 [mW]
Structure1 Temp 29.8 [C]
Structure2 Temp 30.6 [C]
Structure3 Temp 29.5 [C]
Structure4 Temp 29.8 [C]
Battery Cell Temp 34.1 [C]
73, Mike
-----Urspr?ngliche Nachricht-----
Von: i8cvs [mailto:domenico.i8cvs(AT)tin.it]
Gesendet: Sonntag, 27. Juli 2008 21:45
An: 'AMSAT-BB'; Mike Rupprecht
Cc: Francesco Grappi; sv1bsx(AT)yahoo.gr
Betreff: Re: [amsat-bb] FO-29 telemetry
Hi Mike, DK3WN
Tank you very much to decode the FO-29 telemetry. It seems that
all parameters are nominal and the batteries are charging but it should
be necessary to compare the actual performance with some old telemetry
file that you probably have available in your archive.
Please let us know
Tanks and 73" de
i8CVS Domenico
----- Original Message -----
From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
To: "'AMSAT-BB'" <amsat-bb(AT)AMSAT.Org>
Sent: Sunday, July 27, 2008 4:34 PM
Subject: [amsat-bb] FO-29 telemetry
> Hi all,
>
> FO-29 CW telemetry at 1210 UTC, July 27th
>
> 1210 UTC
> hihi 22e288d58f050525002401016a629695b07bb9b4babcb7
> hihi 22e288d58f050525002401016b629695b076b9b4babcb7
> hihi 22e288d58f050525002401017f629594b077b8b4babbb7
> hihi 22e288d58f0505250024010183629595b19eb8b4babbb7
> hihi 22e288d58f0505250024010184629594b165b8b4babbb7
> hihi 22e288d58f0505250024010186629695b075b8b4b9bbb7
> hihi 22e288d58f0505250024010182629595b054b7b3b9bab7
> hihi 22e288d58f050525002401017c629594b09bb7b3b9bab7
>
> Solar Current 1313.7 [mA]
> Battery Current 79.2 [mA]
> Battery Voltage 16.1 [V]
> Middle Voltage 7.2 [V]
> Bus Voltage 17.3 [V]
> JTA Tx Power 662.4 [mW]
> Structure1 Temp 10.4 [C]
> Structure2 Temp 12.0 [C]
> Structure3 Temp 10.0 [C]
> Structure4 Temp 9.3 [C]
> Battery Cell Temp 10.8 [C]
>
> 73, Mike
> DK3WN
>
>
>
>
>
> Von: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] Im
> Auftrag von i8cvs
> Gesendet: Sonntag, 27. Juli 2008 06:08
> An: AMSAT-BB
> Cc: Francesco Grappi
> Betreff: [amsat-bb] FO-29 is alive and well
>
> Hi All,
>
> Following suggestions of my friend Mak, SV1BSX I tried FO-29 this
> night 27 july during the South bound orbit 58978 when the AOS for me
> in JN70ES was at 00:06 UTC and FO-29 was in sun light.
>
> I was alone into the passband and my return signal was very strong above
> my noise floor with appoximately only 10 watt on a 13 dBi crossed yagi
> RHCP / LHCP (about 200 watt EIRP)
>
> The SSB return was very clean and without FMing with the usual need to
> switch RHCP to LHCP time to time to get the best signal strength
>
> At 00:15 UTC FO-29 started to experience the eclipse as per InstanTrack
> but no signe of reduction of my return signal or FMing was noted.
>
> >From 00:15 to 00:21 until my LOS the satellite was over Africa and well
> in full eclipse for about 6 minutes but my own return signal was still
clear
> ad strong without any signe of FMing so that it seems that the battery are
> working and as far I know the satellite performance seems to be nominal.
>
> The CW beacon was ON all the time but it should be necessary to
> decode the TLM to get the actual parameters ( I think IW4DVZ can do
> the job with his suitable software )
>
> The transponder is very sensitive as it was as new so that refrain please
> to use high power because 200 watt EIRP is more than necessary.
>
> I tanks very much Mak SV1BSX for sending to me the results of his
> experience yesterday confirming the results that I got this night both
> confirming that FO-29 seems to be alive and well.
>
> We don't know what JARL did to resurrex this beautiful satellite but
> until she will last we have another real CW and SSB satellite to work.
>
> Congratulations to JARL
>
> 73" de
>
> i8CVS Domenico
------------------------------
Message: 10
Date: Mon, 28 Jul 2008 10:28:55 +1000
From: <morry(AT)tekinnovations.com.au>
Subject: [amsat-bb] Fox Delta ST3 problem
To: amsat-bb(AT)amsat.org
Message-ID: <1328829733bff27647c3b373dce42c0b(AT)tekinnovations.com.au>
Content-Type: text/plain; charset="utf-8"
Hi all,
I have a Fox Delta ST3 interface, and I can't get it working properly. So far
I have:
Adjusted the full scale on the 5500 as per the manual.
Set the output adjust voltage to 4.5 (also tried 4.7) volts.
When the ST3 says 360 degrees, the 5500 display says around 290.
It's almost like it was not designed for a rotator that turns 450 degrees (I
know this is not the case).
I even set the rotor to 360 degrees and tried to adjust the output adjust
voltage to get 360 on the ST3 - there was not enough range!
We have two of these units and both behave the same. Our home made interface
works fine!
Any ideas?
Morry
VK4HBK
------------------------------
Message: 11
Date: Mon, 28 Jul 2008 04:49:49 +0300
From: "SV1BSX" <sv1bsx(AT)yahoo.gr>
Subject: [amsat-bb] Re: FO-29 telemetry
To: "i8cvs" <domenico.i8cvs(AT)tin.it>
Cc: Francesco Grappi <f.grappi(AT)vodafone.it>, amsat-bb(AT)amsat.org,
ei7m-wkt(AT)asahi-net.or.jp
Message-ID: <001a01c8f054$3c0838b0$0b09a8c0(AT)zeus>
Content-Type: text/plain; format=flowed; charset="windows-1253";
reply-type=original
Hi Domenico, i8CVS
last night I collected the Telemetry from FO-29.
Date 27 July 2008, Orbit #58990. AOS 21:27, TCA 21:34, LOS 21:41.
It is very interesting to point out that, the most part of TLM collected
into Eclipe !
If I am not wrong, just the "Data1" is on Sunlight and the rest DATA on
Eclipse.
At 21:32 the FO-29 came on the dark, 2 minutes before the TCA.
The confirming of Sunlight on "Data1" is obvious also by Solar-Panel Current
(= 1000.0 mA).
Also the battery has the biggest Voltage (16.4 ). In the next "Data 2,3,4,
5 & 6" where the FO-20
was on Eclipse, the Solar-Panel Current is just 9.8 mA.
However, the battery voltage is droped down from 16.4 V (Data1 on
Sunlight)
to 14.2 V (Data 6 on Eclipse). That means 2.2 Volts lower in about 5 mins.
I can't say if that is normal or not. It's just my notice and probably is
OK that but,
it should be very interesting if we can find an older TLM-Data into Eclipse
in order
to compare it with this one.
Finally, the following data are 100% OK. As you know dr Domenico, I am
"old fashion"
CW operator by using pencil and paper, however I recorded my reception
and I confirmed
it twice, in order to eliminate any possible fault.
Here is the collected Telemetry DATA:
HI HI 22 E2 88 D5 8F 05 05 25 00 24 01 01 66 63 98 98 B0 5C B6 B1 B8 BA B9
HI HI 22 E2 88 D5 8F 05 05 25 00 24 01 01 01 83 8B 8A 95 85 B6 B0 B8 BA B9
HI HI 22 22 88 D5 8F 05 05 25 00 24 01 01 01 83 87 86 91 8B B6 B0 B7 B9 B9
HI HI 22 22 88 D5 8F 05 05 25 00 24 01 01 01 84 85 84 8F 7A B5 B0 B7 B9 B9
HI HI 22 22 88 D5 8F 05 05 25 00 24 01 01 01 83 85 83 8E 62 B5 B0 B7 B9 B9
HI HI 22 22 88 D5 8F 05 05 25 00 24 01 01 01 85 84 82 8D 95 B5 B0 B7 B9 B9
-------
Data 1
---------
Main Relay ON : DCM ON
SRAM OFF : Packet OFF
JTA ON : JTD OFF
GAS OFF :
SAS OFF : UVC ON
UVC Level 1 : PCU Mode AUTO
PCU Level 3 : Battery Mode TRIC
Battery Logic TRIC :
Digitalker Mode OFF : UVC ACT/PAS PAS
CPU RUN/RESET RUN :
Spin Period 8356.0 [msec]
Sun Angle 72.5 [deg]
GAS-Z 490.2 [nT]
GAS-X 490.2 [nT]
Solar Panel Current 1000.0 [mA]
Battery Current -59.6 [mA]
Battery Voltage 16.4 [V]
Battery Middle Voltage 7.3 [V]
Bus Voltage 17.3 [V]
Analog Tx Power 499.9 [mW]
Structure Temp. 1 11.2 [C]
Structure Temp. 2 13.1 [C]
Structure Temp. 3 10.4 [C]
Structure Temp. 4 9.6 [C]
Battery Cell Temp. 10.0 [C]
---------
Data 2
---------
Main Relay ON : DCM ON
SRAM OFF : Packet OFF
JTA ON : JTD OFF
GAS OFF :
SAS OFF : UVC ON
UVC Level 1 : PCU Mode AUTO
PCU Level 3 : Battery Mode TRIC
Battery Logic TRIC :
Digitalker Mode OFF : UVC ACT/PAS PAS
CPU RUN/RESET RUN :
Spin Period 8356.0 [msec]
Sun Angle 72.5 [deg]
GAS-Z 490.2 [nT]
GAS-X 490.2 [nT]
Solar Panel Current 9.8 [mA]
Battery Current 567.6 [mA]
Battery Voltage 15.0 [V]
Battery Middle Voltage 6.6 [V]
Bus Voltage 14.6 [V]
Analog Tx Power 766.4 [mW]
Structure Temp. 1 11.2 [C]
Structure Temp. 2 13.5 [C]
Structure Temp. 3 10.4 [C]
Structure Temp. 4 9.6 [C]
Battery Cell Temp. 10.0 [C]
---------
Data 3
---------
Main Relay ON : DCM ON
SRAM OFF : Packet OFF
JTA ON : JTD OFF
GAS OFF :
SAS OFF : UVC ON
UVC Level 1 : PCU Mode AUTO
PCU Level 3 : Battery Mode FULL
Battery Logic FULL :
Digitalker Mode OFF : UVC ACT/PAS PAS
CPU RUN/RESET RUN :
Spin Period 8356.0 [msec]
Sun Angle 72.5 [deg]
GAS-Z 490.2 [nT]
GAS-X 490.2 [nT]
Solar Panel Current 9.8 [mA]
Battery Current 567.6 [mA]
Battery Voltage 14.5 [V]
Battery Middle Voltage 6.5 [V]
Bus Voltage 14.2 [V]
Analog Tx Power 805.4 [mW]
Structure Temp. 1 11.2 [C]
Structure Temp. 2 13.5 [C]
Structure Temp. 3 10.8 [C]
Structure Temp. 4 10.0 [C]
Battery Cell Temp. 10.0 [C]
---------
Data 4
---------
Main Relay ON : DCM ON
SRAM OFF : Packet OFF
JTA ON : JTD OFF
GAS OFF :
SAS OFF : UVC ON
UVC Level 1 : PCU Mode AUTO
PCU Level 3 : Battery Mode FULL
Battery Logic FULL :
Digitalker Mode OFF : UVC ACT/PAS PAS
CPU RUN/RESET RUN :
Spin Period 8356.0 [msec]
Sun Angle 72.5 [deg]
GAS-Z 490.2 [nT]
GAS-X 490.2 [nT]
Solar Panel Current 9.8 [mA]
Battery Current 587.2 [mA]
Battery Voltage 14.3 [V]
Battery Middle Voltage 6.4 [V]
Bus Voltage 14.0 [V]
Analog Tx Power 694.9 [mW]
Structure Temp. 1 11.6 [C]
Structure Temp. 2 13.5 [C]
Structure Temp. 3 10.8 [C]
Structure Temp. 4 10.0 [C]
Battery Cell Temp. 10.0 [C]
---------
Data 5
---------
Main Relay ON : DCM ON
SRAM OFF : Packet OFF
JTA ON : JTD OFF
GAS OFF :
SAS OFF : UVC ON
UVC Level 1 : PCU Mode AUTO
PCU Level 3 : Battery Mode FULL
Battery Logic FULL :
Digitalker Mode OFF : UVC ACT/PAS PAS
CPU RUN/RESET RUN :
Spin Period 8356.0 [msec]
Sun Angle 72.5 [deg]
GAS-Z 490.2 [nT]
GAS-X 490.2 [nT]
Solar Panel Current 9.8 [mA]
Battery Current 567.6 [mA]
Battery Voltage 14.3 [V]
Battery Middle Voltage 6.3 [V]
Bus Voltage 13.9 [V]
Analog Tx Power 538.9 [mW]
Structure Temp. 1 11.6 [C]
Structure Temp. 2 13.5 [C]
Structure Temp. 3 10.8 [C]
Structure Temp. 4 10.0 [C]
Battery Cell Temp. 10.0 [C]
---------
Data 6
---------
Main Relay ON : DCM ON
SRAM OFF : Packet OFF
JTA ON : JTD OFF
GAS OFF :
SAS OFF : UVC ON
UVC Level 1 : PCU Mode AUTO
PCU Level 3 : Battery Mode FULL
Battery Logic FULL :
Digitalker Mode OFF : UVC ACT/PAS PAS
CPU RUN/RESET RUN :
Spin Period 8356.0 [msec]
Sun Angle 72.5 [deg]
GAS-Z 490.2 [nT]
GAS-X 490.2 [nT]
Solar Panel Current 9.8 [mA]
Battery Current 606.8 [mA]
Battery Voltage 14.2 [V]
Battery Middle Voltage 6.3 [V]
Bus Voltage 13.8 [V]
Analog Tx Power 870.4 [mW]
Structure Temp. 1 11.6 [C]
Structure Temp. 2 13.5 [C]
Structure Temp. 3 10.8 [C]
Structure Temp. 4 10.0 [C]
Battery Cell Temp. 10.0 [C]
======================== END of message ==================
73 de Mak, SV1BSX
----- Original Message -----
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
To: "'AMSAT-BB'" <amsat-bb(AT)AMSAT.Org>; "Mike Rupprecht"
<mail(AT)mike-rupprecht.de>
Cc: "Francesco Grappi" <f.grappi(AT)vodafone.it>; <sv1bsx(AT)yahoo.gr>
Sent: Sunday, July 27, 2008 10:44 PM
Subject: Re: [amsat-bb] FO-29 telemetry
> Hi Mike, DK3WN
>
> Tank you very much to decode the FO-29 telemetry. It seems that
> all parameters are nominal and the batteries are charging but it should
> be necessary to compare the actual performance with some old telemetry
> file that you probably have available in your archive.
>
> Please let us know
>
> Tanks and 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Mike Rupprecht" <mail(AT)mike-rupprecht.de>
> To: "'AMSAT-BB'" <amsat-bb(AT)AMSAT.Org>
> Sent: Sunday, July 27, 2008 4:34 PM
> Subject: [amsat-bb] FO-29 telemetry
>
>
>> Hi all,
>>
>> FO-29 CW telemetry at 1210 UTC, July 27th
>>
>> 1210 UTC
>> hihi 22e288d58f050525002401016a629695b07bb9b4babcb7
>> hihi 22e288d58f050525002401016b629695b076b9b4babcb7
>> hihi 22e288d58f050525002401017f629594b077b8b4babbb7
>> hihi 22e288d58f0505250024010183629595b19eb8b4babbb7
>> hihi 22e288d58f0505250024010184629594b165b8b4babbb7
>> hihi 22e288d58f0505250024010186629695b075b8b4b9bbb7
>> hihi 22e288d58f0505250024010182629595b054b7b3b9bab7
>> hihi 22e288d58f050525002401017c629594b09bb7b3b9bab7
>>
>> Solar Current 1313.7 [mA]
>> Battery Current 79.2 [mA]
>> Battery Voltage 16.1 [V]
>> Middle Voltage 7.2 [V]
>> Bus Voltage 17.3 [V]
>> JTA Tx Power 662.4 [mW]
>> Structure1 Temp 10.4 [C]
>> Structure2 Temp 12.0 [C]
>> Structure3 Temp 10.0 [C]
>> Structure4 Temp 9.3 [C]
>> Battery Cell Temp 10.8 [C]
>>
>> 73, Mike
>> DK3WN
>>
>>
>>
>>
>>
>> Von: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org]
Im
>> Auftrag von i8cvs
>> Gesendet: Sonntag, 27. Juli 2008 06:08
>> An: AMSAT-BB
>> Cc: Francesco Grappi
>> Betreff: [amsat-bb] FO-29 is alive and well
>>
>> Hi All,
>>
>> Following suggestions of my friend Mak, SV1BSX I tried FO-29 this
>> night 27 july during the South bound orbit 58978 when the AOS for me
>> in JN70ES was at 00:06 UTC and FO-29 was in sun light.
>>
>> I was alone into the passband and my return signal was very strong above
>> my noise floor with appoximately only 10 watt on a 13 dBi crossed yagi
>> RHCP / LHCP (about 200 watt EIRP)
>>
>> The SSB return was very clean and without FMing with the usual need to
>> switch RHCP to LHCP time to time to get the best signal strength
>>
>> At 00:15 UTC FO-29 started to experience the eclipse as per InstanTrack
>> but no signe of reduction of my return signal or FMing was noted.
>>
>> >From 00:15 to 00:21 until my LOS the satellite was over Africa and well
>> in full eclipse for about 6 minutes but my own return signal was still
> clear
>> ad strong without any signe of FMing so that it seems that the battery
>> are
>> working and as far I know the satellite performance seems to be nominal.
>>
>> The CW beacon was ON all the time but it should be necessary to
>> decode the TLM to get the actual parameters ( I think IW4DVZ can do
>> the job with his suitable software )
>>
>> The transponder is very sensitive as it was as new so that refrain please
>> to use high power because 200 watt EIRP is more than necessary.
>>
>> I tanks very much Mak SV1BSX for sending to me the results of his
>> experience yesterday confirming the results that I got this night both
>> confirming that FO-29 seems to be alive and well.
>>
>> We don't know what JARL did to resurrex this beautiful satellite but
>> until she will last we have another real CW and SSB satellite to work.
>>
>> Congratulations to JARL
>>
>> 73" de
>>
>> i8CVS Domenico
>
>
>
------------------------------
_______________________________________________
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 379
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