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CX2SA > SATDIG 05.09.13 20:59l 682 Lines 25267 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: A0 40 replacement (Zach Leffke)
2. S band LEO Sat tracking (michael luft)
3. Re: A0 40 replacement (Bryce Salmi)
4. Re: S band LEO Sat tracking (Stefan Wagener)
5. Re: A0 40 replacement (n0jy)
6. Re: Say "Hi" To Juno (Callsign end's with "F") (Glenn AA5PK)
7. Re: A0 40 replacement (Bryce Salmi)
8. Re: A0 40 replacement (M5AKA)
9. Re: AO-40 Replacement (John Stephensen)
----------------------------------------------------------------------
Message: 1
Date: Thu, 5 Sep 2013 10:03:42 -0400
From: "Zach Leffke" <zleffke@xx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: A0 40 replacement
Message-ID: <001401ceaa40$bab27710$30176530$@xx.xxx>
Content-Type: text/plain; charset="us-ascii"
Just throwing this out there:
1. University cubesats tend to want to occupy amateur satellite service
spectrum for their science missions, V/U is common.
2. Most *science* missions are only designed to last a few years, but the
orbits will last a while longer.
3. How many science missions have been completed, but the spacecraft is
still in orbit and occupying amateur spectrum? (I don't know the answer but
I suspect it's a decent number, probably out of single digits and into
double digits, see
http://www.nasa.gov/directorates/heo/home/CSLI_selections.html to get an
idea of the number of cubesats going up from universities, note the number
of "in work")
4. What if those university spacecraft carried Software Defined Radio
technology as their primary method for delivering their mission data to the
ground?
5. What if upon completion of their mission the universities turned over
control of the spacecraft to AMSAT.
6. AMSAT then reconfigures the spacecraft such that the SDRs are now used
for voice or data relay (FM, Linear, packet, whatever).
7. Now all of a sudden, hams don't have to wait for a new spacecraft to get
built and find a launch. Birds already in orbit, that are using Amateur
Spectrum, now all of a sudden are providing a service to the Amateur
community.
Personally, I'm glad the universities are using Amateur Radio spectrum for
their science missions. I view the skies as a "target rich environment"
even if all I can do is listen to these birds. However, it would be nice if
the birds occupying amateur spectrum actually provided a service to the
amateur community. But what if the SDX that flew on ARISSat, or the one
that will be developed for the Future of the Fox series could be "sold" (or
given) to the university cubesat community as a radio capable of being used
to deliver science data? Their science mission concludes, control is turned
over to AMSAT, the radios are reconfigured, and they become transponder
birds for the ham community.
At the rate that these spacecraft are going up, even if we nab only 10% of
the spacecraft listed on the link above and convince them to fly SDRs that
can be reconfigured, that's roughly 9 satellites that over time become
useable by the ham community as voice/data transponders. We don't have to
build them, we don't have to find a launch, we don't have to do anything but
wait until the science mission is over and then play. Will the spacecraft
be of the same quality of what comes out of AMSAT? Maybe, maybe not, but
even if one only lasts a year as an FM or Linear Transponder, I'd take it,
and use it.
Granted, who knows what the orbits would be, so a replacement for AO-40?
Probably not. But would the Amateur Satellite community accept maybe
instead of 1 really long pass from a HEO bird, maybe in that same time frame
10 or 20 or maybe even 50 passes from multiple lower birds (I made these
numbers up, no idea what the actual numbers would be)?
Granted, there is a LOT that would go into making this idea possible. We'd
have to have an SDR the universities are willing to use, probably one with
flight history (cough, Fox-2, cough). We'd have to have someone go around
to the Universities and "sell it" to the Principal Investigators that our
radio will work for them (technical issues aside, maybe they get a little PR
by adding support for the Amateur community onto their list of mission
objectives). If they agree to fly the radio, and then turn over control, we
need to be capable of supporting those spacecraft from an Operational point
of view when the time comes. We would need to have some sort of "filter"
such that if they drive the heck out of their spacecraft to the point that
it is nearly dead when their science mission concludes we have the option to
reject taking the spacecraft over. Etc. Etc. Etc.
There's a lot of "what ifs" up there, but my favorite "what if" to think
about is: what if the 89 satellites on that link above were capable of
supporting amateur use at the conclusion of their science missions (Fox-1 is
on that list, so ok 88 satellites)? 89 satellites + what AMSAT has and is
still putting up? Can't make a contact during field day on an FM bird
because of crowding, no problem, you have 5 other satellites to choose from
and try.
My second favorite "what if" to think about is: what if the university
cubesats occupying amateur spectrum actually provided a service to the
amateur community?
A traditional replacement of AO-40? No. Effectively reproducing the similar
amounts of access time and capabilities of AO-40? Maybe.
Like I said, just throwing the idea out there...
-Zach, KJ4QLP
------------------------------
Message: 2
Date: Thu, 5 Sep 2013 12:59:29 +0300
From: michael luft <milu111@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] S band LEO Sat tracking
Message-ID:
<CAAE_EzO1pwfCg5M7DrJHqc-urLXMxf+44JJ5W2W-zAgrc_jCuA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
What kind of positioning accuracy can be expected form amateur PC Software
and Antenna Rotators? Or, in other words: What kind of S band antenna (
gain or dimensions) is needed to track a S band LEO Sat?
73
Michael
------------------------------
Message: 3
Date: Thu, 05 Sep 2013 08:37:17 -0700
From: Bryce Salmi <bstguitarist@xxxxx.xxx>
To: Zach Leffke <zleffke@xx.xxx>, amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: A0 40 replacement
Message-ID: <881eb8fc-0f28-4b7e-9d48-b56369df63ee@xxxxx.xxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
You just described the objective of the Fox-1 FM RF board. This is exactly
the position AMSAT is trying to get into. There's a YouTube video that
interviews Barry Baines and he ends up explaining this goal. I'd link to it
but am currently typing this on my phone .
Zach Leffke <zleffke@xx.xxx> wrote:
>Just throwing this out there:
>
>1. University cubesats tend to want to occupy amateur satellite
>service
>spectrum for their science missions, V/U is common.
>2. Most *science* missions are only designed to last a few years, but
>the
>orbits will last a while longer.
>3. How many science missions have been completed, but the spacecraft
>is
>still in orbit and occupying amateur spectrum? (I don't know the answer
>but
>I suspect it's a decent number, probably out of single digits and into
>double digits, see
>http://www.nasa.gov/directorates/heo/home/CSLI_selections.html to get
>an
>idea of the number of cubesats going up from universities, note the
>number
>of "in work")
>4. What if those university spacecraft carried Software Defined Radio
>technology as their primary method for delivering their mission data to
>the
>ground?
>5. What if upon completion of their mission the universities turned
>over
>control of the spacecraft to AMSAT.
>6. AMSAT then reconfigures the spacecraft such that the SDRs are now
>used
>for voice or data relay (FM, Linear, packet, whatever).
>7. Now all of a sudden, hams don't have to wait for a new spacecraft
>to get
>built and find a launch. Birds already in orbit, that are using
>Amateur
>Spectrum, now all of a sudden are providing a service to the Amateur
>community.
>
>Personally, I'm glad the universities are using Amateur Radio spectrum
>for
>their science missions. I view the skies as a "target rich
>environment"
>even if all I can do is listen to these birds. However, it would be
>nice if
>the birds occupying amateur spectrum actually provided a service to the
>amateur community. But what if the SDX that flew on ARISSat, or the
>one
>that will be developed for the Future of the Fox series could be "sold"
>(or
>given) to the university cubesat community as a radio capable of being
>used
>to deliver science data? Their science mission concludes, control is
>turned
>over to AMSAT, the radios are reconfigured, and they become transponder
>birds for the ham community.
>
>At the rate that these spacecraft are going up, even if we nab only 10%
>of
>the spacecraft listed on the link above and convince them to fly SDRs
>that
>can be reconfigured, that's roughly 9 satellites that over time become
>useable by the ham community as voice/data transponders. We don't have
>to
>build them, we don't have to find a launch, we don't have to do
>anything but
>wait until the science mission is over and then play. Will the
>spacecraft
>be of the same quality of what comes out of AMSAT? Maybe, maybe not,
>but
>even if one only lasts a year as an FM or Linear Transponder, I'd take
>it,
>and use it.
>
>Granted, who knows what the orbits would be, so a replacement for
>AO-40?
>Probably not. But would the Amateur Satellite community accept maybe
>instead of 1 really long pass from a HEO bird, maybe in that same time
>frame
>10 or 20 or maybe even 50 passes from multiple lower birds (I made
>these
>numbers up, no idea what the actual numbers would be)?
>
>Granted, there is a LOT that would go into making this idea possible.
>We'd
>have to have an SDR the universities are willing to use, probably one
>with
>flight history (cough, Fox-2, cough). We'd have to have someone go
>around
>to the Universities and "sell it" to the Principal Investigators that
>our
>radio will work for them (technical issues aside, maybe they get a
>little PR
>by adding support for the Amateur community onto their list of mission
>objectives). If they agree to fly the radio, and then turn over
>control, we
>need to be capable of supporting those spacecraft from an Operational
>point
>of view when the time comes. We would need to have some sort of
>"filter"
>such that if they drive the heck out of their spacecraft to the point
>that
>it is nearly dead when their science mission concludes we have the
>option to
>reject taking the spacecraft over. Etc. Etc. Etc.
>
>There's a lot of "what ifs" up there, but my favorite "what if" to
>think
>about is: what if the 89 satellites on that link above were capable of
>supporting amateur use at the conclusion of their science missions
>(Fox-1 is
>on that list, so ok 88 satellites)? 89 satellites + what AMSAT has and
>is
>still putting up? Can't make a contact during field day on an FM bird
>because of crowding, no problem, you have 5 other satellites to choose
>from
>and try.
>
>My second favorite "what if" to think about is: what if the university
>cubesats occupying amateur spectrum actually provided a service to the
>amateur community?
>
>A traditional replacement of AO-40? No. Effectively reproducing the
>similar
>amounts of access time and capabilities of AO-40? Maybe.
>
>Like I said, just throwing the idea out there...
>
>-Zach, KJ4QLP
>
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. 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 from my Android phone with K-9 Mail. Please excuse my brevity.
------------------------------
Message: 4
Date: Thu, 5 Sep 2013 10:44:13 -0500
From: Stefan Wagener <wageners@xxxxx.xxx>
To: michael luft <milu111@xxxxx.xxx>
Cc: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: S band LEO Sat tracking
Message-ID:
<CAKu8kHBSLK-7Zsd4r5JCvgHwjdDnUYPuBSL3L-PBidamrgmOqw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Here you go:
http://www.amsat.it/Amsat-Italia_HamTV.pdf
On Thu, Sep 5, 2013 at 4:59 AM, michael luft <milu111@xxxxx.xxx> wrote:
> What kind of positioning accuracy can be expected form amateur PC Software
> and Antenna Rotators? Or, in other words: What kind of S band antenna (
> gain or dimensions) is needed to track a S band LEO Sat?
>
> 73
> Michael
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: 5
Date: Thu, 05 Sep 2013 10:44:47 -0500
From: n0jy <n0jy@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: A0 40 replacement
Message-ID: <5228A6EF.9070904@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Zach,
On 9/5/2013 9:03 AM, Zach Leffke wrote:
> Just throwing this out there:
>
> But what if the SDX that flew on ARISSat, or the one
> that will be developed for the Future of the Fox series could be "sold" (or
> given) to the university cubesat community as a radio capable of being used
> to deliver science data? Their science mission concludes, control is turned
> over to AMSAT, the radios are reconfigured, and they become transponder
> birds for the ham community.
>
>
Yes, and this is one of the goals of the Fox project too!
We can partner with the universities, providing the transponder and bus
(Fox-1A, RadFXSat) which may be dedicated to their experiment for some
years or not, depending on the downlink needs (i.e. Fox-1 has high speed
for youse guys, and the slow speed accommodates Vanderbilt). We have a
transponder dedicated to ham use when the experiment(s) are through or
even while they are going on.
Or once Fox-1 is finished and all of the details are published, any
institution could use the design for their project and "give back" (as a
gesture of kindness for all the work we saved them and excellent science
we helped them gather) the transponder when they are done with their
science. It gives them a proven reliable system that they don't have to
engineer on their own. It gives us another transponder if not on
launch, at least eventually.
Fox-2 will do the same for ham satellite SDX.
Anybody know any young people who are in a position to help sell this
paradigm to universities? ;-)
Jerry
------------------------------
Message: 6
Date: Thu, 5 Sep 2013 11:17:00 -0500
From: "Glenn AA5PK" <aa5pk@xxxxxxxxxx.xxx>
To: <les@xxxxxxxxxxxx.xxx>, "AMSAT Mailing List" <amsat-bb@xxxxx.xxx>,
<vhf@xxxx.xxxxxxxx.xxx>
Subject: [amsat-bb] Re: Say "Hi" To Juno (Callsign end's with "F")
Message-ID: <1405D7E1E67244D197586159778519FD@xxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
They updated the site and changed nearly all of the 28 MHZ freqs.
----- Original Message -----
From: "Les Rayburn" <les@xxxxxxxxxxxx.xxx>
To: "AMSAT Mailing List" <amsat-bb@xxxxx.xxx>; <vhf@xxxx.xxxxxxxx.xxx>
Sent: Wednesday, September 04, 2013 2:12 PM
Subject: [amsat-bb] Say "Hi" To Juno (Callsign end's with "F")
>I reached out to JPL to ask what the desired frequency for this experiment
would be if your amateur callsign ended in the
>letter "F". Here's the response:
>
>
> /Hi Les- What a strange thing for us to leave out! The omission will be
corrected in our next update of the page this week.
>
> In the updated frequency table we will publish, F corresponds to 28.091 MHz.
>
> Thanks for your interest in this activity!/
>
> Cheers,
> Preston Dyches
> Solar system & technology public engagement NASA - Jet Propulsion
Laboratory MS 230-275
> 4800 Oak Grove Drive
> Pasadena, CA 91109
>
>
> --
> --
> 73,
>
> Les Rayburn, N1LF
> 121 Mayfair Park
> Maylene, AL 35114
> EM63nf
>
> 6M VUCC #1712
> AMSAT #38965
> Grid Bandits #222
> Southeastern VHF Society
> Central States VHF Society Life Member
> Six Club #2484
>
> Active on 6 Meters thru 1296, 10GHz & Light
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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: 7
Date: Thu, 5 Sep 2013 09:28:16 -0700
From: Bryce Salmi <bstguitarist@xxxxx.xxx>
Cc: Amsat BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: A0 40 replacement
Message-ID:
<CAN5j0sqv0gy6gih8UtNDVL-j_KO7K30YWjq5_hE-YR4ZaW_6KQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Here is the video where this mission object is stated:
http://www.youtube.com/watch?feature=player_detailpage&v=3o_PV2b9F6g#t=459
On Thu, Sep 5, 2013 at 8:44 AM, n0jy <n0jy@xxxx.xxx> wrote:
> Hi Zach,
>
>
> On 9/5/2013 9:03 AM, Zach Leffke wrote:
>
>> Just throwing this out there:
>>
>> But what if the SDX that flew on ARISSat, or the one
>> that will be developed for the Future of the Fox series could be "sold"
>> (or
>> given) to the university cubesat community as a radio capable of being
>> used
>> to deliver science data? Their science mission concludes, control is
>> turned
>> over to AMSAT, the radios are reconfigured, and they become transponder
>> birds for the ham community.
>>
>>
>> Yes, and this is one of the goals of the Fox project too!
> We can partner with the universities, providing the transponder and bus
> (Fox-1A, RadFXSat) which may be dedicated to their experiment for some
> years or not, depending on the downlink needs (i.e. Fox-1 has high speed
> for youse guys, and the slow speed accommodates Vanderbilt). We have a
> transponder dedicated to ham use when the experiment(s) are through or even
> while they are going on.
> Or once Fox-1 is finished and all of the details are published, any
> institution could use the design for their project and "give back" (as a
> gesture of kindness for all the work we saved them and excellent science we
> helped them gather) the transponder when they are done with their science.
> It gives them a proven reliable system that they don't have to engineer on
> their own. It gives us another transponder if not on launch, at least
> eventually.
> Fox-2 will do the same for ham satellite SDX.
> Anybody know any young people who are in a position to help sell this
> paradigm to universities? ;-)
>
> Jerry
>
> ______________________________**_________________
> Sent via AMSAT-BB@xxxxx.xxx. 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<http://amsat.org/mailman/listinfo
/amsat-bb>
>
------------------------------
Message: 8
Date: Thu, 5 Sep 2013 17:37:01 +0100 (BST)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: Zach Leffke <zleffke@xx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: A0 40 replacement
Message-ID:
<1378399021.64195.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
> But what if the SDX that flew on ARISSat, or the one
> that will be developed for the Future of the Fox series could be "sold" (or
> given) to the university cubesat community as a radio capable of being used
> to deliver science data?
Hi Zach,
Unfortunately there goes the CubeSat's power budget.
The SDX transponders have an overhead, not just in terms of the physical
space they occupy, but the amount of power they consume.
I believe the most efficient SDX transponder has an overhead of some 350 mW
above the power consumed by an analog linear transponder and a linear
transponder itself would consume more power than a standard 9600 bps CubeSat
telemetry module.
So it appears to be a non-starter for 1U CubeSats. Might be feasible on 3U
CubeSats but it would mean much less power would be available for other
experiments on the CubeSat.
The question is what's in it for the CubeSat team ? The answer may be a
higher data rate, the existing 9600 bps just isn't fast enough. In theory,
depending on the modulation employed, a 30 kHz bandwidth SDX transponder
could generate a 96 kbps downlink which is much more useful. To some the
trade-off of power budget for downlink speed may prove appealing.
At the moment it's all theoretical but certainly worth considering when a
FOX-2 SDX transponder has been proven to work in space.
73 Trevor M5AKA
------------------------------
Message: 9
Date: Thu, 5 Sep 2013 18:24:07 -0000
From: "John Stephensen" <kd6ozh@xxxxxxx.xxx>
To: "Virgil Bierschwale" <vbiersch@xxxxx.xxx>, "'Clint Bradford'"
<clintbrad4d@xxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-40 Replacement
Message-ID: <53E29EF9F6224265B18501EE21C13C83@xxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
New equipment wouldn't be needed. The concept is to use the PCs that
amateurs already have to fit more QSOs into the downlink. Uplink frequency
coordination isn't any harder than on AO10, 13 or 40.
73,
John
KD6OZH
----- Original Message -----
From: "Virgil Bierschwale" <vbiersch@xxxxx.xxx>
To: "'John Stephensen'" <kd6ozh@xxxxxxx.xxx>; "'Clint Bradford'"
<clintbrad4d@xxxxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Thursday, September 05, 2013 03:13 UTC
Subject: RE: [amsat-bb] Re: AO-40 Replacement
> You also could develop a whole new line of amateur radio equipment.
>
> By that, I mean that ham's could use existing transceivers, and for
> satellites that were equipped, they could buy this box that would allow
> them
> to transmit on channel ?? of frequency ?? and the same on receive.
>
> Of course, that might present a co-ordination nightmare...
>
> Virgil
> N5IVV
>
>
> -----Original Message-----
> From: John Stephensen [mailto:kd6ozh@xxxxxxx.xxxx
> Sent: Wednesday, September 04, 2013 9:25 PM
> To: Virgil Bierschwale; 'Clint Bradford'; amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Re: AO-40 Replacement
>
> The satellite could collect the individual uplink signals and package them
> in one downlink. One TDM downlink would use much less power than FDM
> downlinks and would fit in the bandwidth of existing amateur receivers.
> Once
> you have DSP in the satellite, there are a lot of possibilities.
>
> 73,
>
> John
> KD6OZH
>
> ----- Original Message -----
> From: "Virgil Bierschwale" <vbiersch@xxxxx.xxx>
> To: "'John Stephensen'" <kd6ozh@xxxxxxx.xxx>; "'Clint Bradford'"
> <clintbrad4d@xxxxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
> Sent: Thursday, September 05, 2013 01:52 UTC
> Subject: RE: [amsat-bb] Re: AO-40 Replacement
>
>
>> I've enjoyed reading this segment and I wasn't going to touch it, but
>> this
>> one makes me want to chip in my two cents.
>>
>> Granted, I'm not up to speed on what ya'll have done or what you haven't
>> done.
>>
>> But we used to use a ucc1 in the navy to receive messages.
>>
>> http://www.virhistory.com/navy/rtty-mux-ucc1.htm
>>
>> It would allow us to receive something like 16 or 32 separate traffic
>> channels on one frequency.
>>
>> Wouldn't it be possible to develop something like that in satellite
>> communications?
>>
>> I ask because if you were to do it, you could substantially increase the
>> amount of channels that you could process?
>>
>> Virgil
>> N5IVV
>>
>>
>> -----Original Message-----
>> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
>> Behalf Of John Stephensen
>> Sent: Wednesday, September 04, 2013 8:31 PM
>> To: Clint Bradford; amsat-bb@xxxxx.xxx
>> Subject: [amsat-bb] Re: AO-40 Replacement
>>
>> If we want the most "bang for the buck", it would be something that
>> supports
>> the most QSOs per watt of solar power. Since most hams have computers,
>> something that supports half a dozen PSK31 sessions would suffice. Given
>> the
>> new open-source voice codec you could also make something that supports
>> multiple digital voice QSOs with less power than now required for analog
>> FM
>> or SSB.
>>
>> 73,
>>
>> John
>> KD6OZH
>>
>> ----- Original Message -----
>> From: "Clint Bradford" <clintbrad4d@xxxxxxxxx.xxx>
>> To: <amsat-bb@xxxxx.xxx>; <amsat-bb@xxxxx.xxx>
>> Sent: Thursday, September 05, 2013 00:27 UTC
>> Subject: [amsat-bb] Re: AO-40 Replacement
>>
>>
>>>>> ... launch opportunities are so rare that we ought to
>>> fly the most capable equipment we can on those rare
>>> occasions when we can get a launch ...
>>>
>>> Perhaps we should define, "most capable equipment." And
>>> we also need to define "bang for the buck."
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. 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@xxxxx.xxx. 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 8, Issue 298
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