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CX2SA > SATDIG 08.02.13 15:34l 748 Lines 23892 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V8 41
Path: IZ3LSV<IK2XDE<ON4HU<CX2SA
Sent: 130208/1435Z @:CX2SA.SAL.URY.SA #:3200 [Salto] FBB7.00e $:AMSATBB841
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Getting back into Satellites (Kevin Muenzler, WB5RUE)
2. Re: Close encounters of the Asteroidal Kind (Bob- W7LRD)
3. Re: Close encounters of the Asteroidal Kind (Tony Langdon)
4. Re: Close encounters of the Asteroidal Kind (Vince Fiscus, KB7ADL)
5. Re: Close encounters of the Asteroidal Kind (Andrew Glasbrenner)
6. Re: Close encounters of the Asteroidal Kind (Tony Langdon)
7. Re: Close encounters of the Asteroidal Kind (Tony Langdon)
8. Re: Close encounters of the Asteroidal Kind (Jeff Yanko)
9. WD9EWK @ Superstition Hamfest (Mesa AZ) on Saturday morning
(Patrick STODDARD (WD9EWK/VA7EWK))
10. Re: Getting back into Satellites (Andrew Glasbrenner)
11. FO29 HAWAII PASS (Robert Smith)
12. Re: Getting back into Satellites (Greg D)
13. Re: Close encounters of the Asteroidal Kind (Greg D)
14. FO-29 Video (Trevor .)
15. Re: Close encounters of the Asteroidal Kind (Robert Bruninga)
----------------------------------------------------------------------
Message: 1
Date: Thu, 7 Feb 2013 14:33:53 -0600
From: "Kevin Muenzler, WB5RUE" <kevin@xxxxxxxxxxxxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Getting back into Satellites
Message-ID: <000701ce0572$756afec0$6040fc40$@xxx>
Content-Type: text/plain; charset="us-ascii"
73/all
Is Full Duplex really required or just nice to have? Currently my setup
(which doesn't include an antenna at the moment due to storms) is a Yaesu
FT-790(uhf) and FT-290(vhf). Both do FM and SSB at about 25 watts. I've
used to use my 290 for the old RS-12/13 and RS-15 birds along with my FT-890
(RIP) for the 10 meter downlink so I do have "full duplex" but is it a
necessary feature? I know it's nice to be able to hear yourself to know
that you are even getting into the machine.
73/
Kevin Muenzler, WB5RUE
Grid EL09uf
Eagle Creek Observatory
http://www.eaglecreekobservatory.org
I have not yet begun to procrastinate!
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Andrew Glasbrenner
Sent: Thursday, February 07, 2013 11:04 AM
To: jeffrey.embry@xxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Getting back into Satellites
There is only one currently operable FM satellite, and many of the sats due
to be launched this year are transponders or FM/DSB repeaters.
My suggestion would be to find a Yaesu 817 to get a toe into transponders,
and add -any- UHF receiver for full duplex FM. The little Baofeng UV3s are
like $45 and have good receivers in them.
73, Drew KO4MA
Sent from my iPhone
On Feb 7, 2013, at 10:26 AM, Jeffrey Embry <jeffrey.embry@xxxxx.xxx> wrote:
> Good Day all,
>
> After a few years hiatis, I am contemplating getting back on the
> birds. Because I currently live in an apartment, I plan on starting
> the easy route using an arrow antenna. My question is, since I sold
> my last HT about a decade ago, what is recommended for the current
> models of HTs that have full-duplex capabilities?
>
> 73es,
>
> --
> Jeff Embry, K3OQ
> FM19nb
> ARCI #11643, FPQRP #-696,
> QRP-L # 67, NAQCC #25, ARS #1733
> AMSAT LM-2263
>
> --
> Success is the ability to go from one failure to another with no loss
> of enthusiasm. - Sir Winston Churchill
> _______________________________________________
> 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-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Thu, 7 Feb 2013 20:49:57 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID:
<765522359.325082.1360270197071.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxxx
xx.xxx>
Content-Type: text/plain; charset=utf-8
maybe "asteroid bounce"? (EAE)
73 Bob W7LRD
----- Original Message -----
From: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Thursday, February 7, 2013 7:18:47 AM
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
At 01:06 AM 2/7/2013 -0500, k3io@xxxxxxx.xxx wrote:
>Next week (Feb 15) the earth will be visited by asteroid 2012 DA14 passing
>inside the gestationary satellite orbits. To quote from
>http://echo.jpl.nasa.gov/asteroids/2012DA14/2012DA14_planning.html,
>>2012 DA14 was discovered by the La Sagra Sky Survey in Spain on February
>>23, 2012.
>>This object will make an extremely close approach to within 0.00023 AU of
>>Earth at
>>19:25 UT (11:25 AM PST) on February 15, 2013. That is only 0.09 lunar
>>distances or 5.4 Earth
>>radii from the center of the Earth. The close approach will be about
>>28000 km above Earth's
>>surface. That's inside the distance to geosynchronous satellites but
>>thousands of kilometers
>>above the elevation for low-Earth-orbit spacecraft such as the
>>International Space Station.
>>At the time of closest approach, the asteroid will move about 0.8 degrees
>>per minute.
>There is considerable interest in the astronomy community over plans to do
>radar tracking of the asteroid. The Goldstone 70M dish will be running MAX
>QRO with 435 kW.
>
>73 de Tom, K3IO
I know some might think this is off topic, but I enjoy seeing reports
like these on the BB.
Thanks Tom.
KB7ADL
_______________________________________________
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: 3
Date: Fri, 08 Feb 2013 09:01:58 +1100
From: Tony Langdon <vk3jed@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID: <51142456.4030809@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 8/02/13 7:49 AM, Bob- W7LRD wrote:
> maybe "asteroid bounce"? (EAE)
> 73 Bob W7LRD
Someone on the moonbounce reflector crunched the numbers and came up
with a path loss figure something like 51dB worse than EME, if I
recall. The small cross section area was the killer.
Still, nothing ventured, nothing gained. :)
--
73 de Tony VK3JED
http://vkradio.com
------------------------------
Message: 4
Date: Thu, 07 Feb 2013 15:33:26 -0700
From: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID: <5.2.1.1.2.20130207152338.00c24410@xxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 09:01 AM 2/8/2013 +1100, Tony Langdon <vk3jed@xxxxx.xxx> wrote:
>On 8/02/13 7:49 AM, Bob- W7LRD wrote:
>>maybe "asteroid bounce"? (EAE)
>>73 Bob W7LRD
>Someone on the moonbounce reflector crunched the numbers and came up with
>a path loss figure something like 51dB worse than EME, if I recall. The
>small cross section area was the killer.
>
>--
>73 de Tony VK3JED
Well from the original post:
>The Goldstone 70M dish will be running MAX QRO with 435 kW.
That ought to be enough for EAE. HAAAA. CQ asteroid, CQ asteroid!
KB7ADL
------------------------------
Message: 5
Date: Thu, 7 Feb 2013 19:11:10 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: Tony Langdon <vk3jed@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID: <1E11E4DB-31CA-4E40-9564-ABE6043B9D29@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I wonder if they considered that it may be significantly more reflective?
73, Drew KO4MA
Sent from my iPhone
On Feb 7, 2013, at 5:01 PM, Tony Langdon <vk3jed@xxxxx.xxx> wrote:
> On 8/02/13 7:49 AM, Bob- W7LRD wrote:
>> maybe "asteroid bounce"? (EAE)
>> 73 Bob W7LRD
> Someone on the moonbounce reflector crunched the numbers and came up with
a path loss figure something like 51dB worse than EME, if I recall. The
small cross section area was the killer.
>
> Still, nothing ventured, nothing gained. :)
>
> --
> 73 de Tony VK3JED
> http://vkradio.com
>
> _______________________________________________
> 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: 6
Date: Fri, 08 Feb 2013 12:07:41 +1100
From: Tony Langdon <vk3jed@xxxxx.xxx>
To: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID: <51144FDD.1000000@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 8/02/13 11:11 AM, Andrew Glasbrenner wrote:
> I wonder if they considered that it may be significantly more reflective?
I can't see it being more than 15-20db to get from the moon's
reflectivity to a perfect reflector. Still, every bit helps. :)
--
73 de Tony VK3JED
http://vkradio.com
------------------------------
Message: 7
Date: Fri, 08 Feb 2013 12:09:04 +1100
From: Tony Langdon <vk3jed@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID: <51145030.9020903@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 8/02/13 9:33 AM, Vince Fiscus, KB7ADL wrote:
>
> Well from the original post:
>
>> The Goldstone 70M dish will be running MAX QRO with 435 kW.
>
>
> That ought to be enough for EAE. HAAAA. CQ asteroid, CQ asteroid!
There's your 51+ dB! :D Slightly outside amateur power levels or the
antennas available to hams. :D
--
73 de Tony VK3JED
http://vkradio.com
------------------------------
Message: 8
Date: Thu, 7 Feb 2013 17:22:55 -0800
From: "Jeff Yanko" <wb3jfs@xxx.xxx>
To: "Tony Langdon" <vk3jed@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID: <8547839E9ABB45109ECE9E925231A999@xxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
What frequency do they use to ping space rocks? Do they use different
frequencies when they are pretty certain if it is rock, metal or ice and
dirt?
Jeff WB3JFS
----- Original Message -----
From: "Tony Langdon" <vk3jed@xxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Thursday, February 07, 2013 5:09 PM
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
> On 8/02/13 9:33 AM, Vince Fiscus, KB7ADL wrote:
>>
>> Well from the original post:
>>
>>> The Goldstone 70M dish will be running MAX QRO with 435 kW.
>>
>>
>> That ought to be enough for EAE. HAAAA. CQ asteroid, CQ asteroid!
> There's your 51+ dB! :D Slightly outside amateur power levels or the
> antennas available to hams. :D
>
> --
> 73 de Tony VK3JED
> http://vkradio.com
>
> _______________________________________________
> 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: 9
Date: Thu, 7 Feb 2013 19:45:55 -0800 (PST)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] WD9EWK @ Superstition Hamfest (Mesa AZ) on
Saturday morning
Message-ID:
<1360295155.26885.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
I will have an AMSAT table at the Superstition Amateur Radio
Club's annual hamfest in Mesa, Arizona, on Saturday (9
February 2013) morning. This hamfest was supposed to take
place in early December, but was postponed due to scheduling
conflicts. The hamfest will be at the usual location, in
the southwest parking lot at Mesa Community College - along
the east side of Dobson Road between Southern Avenue and the
US-60 freeway (exit 177). More information about the hamfest
is available at:
http://wb7tjd.org/hamfest
WD9EWK will be on various satellite passes during the morning.
Please call if you hear my call on those passes, and be part of
the demonstrations. If you work WD9EWK and want a QSL card,
please e-mail me after the hamfest with the QSO details. No
need to first send me a card. QSOs will also be uploaded to
the Logbook of the World.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 10
Date: Thu, 7 Feb 2013 22:52:31 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: "Kevin Muenzler, WB5RUE" <kevin@xxxxxxxxxxxxxxxxxxxxx.xxx>
Cc: "<amsat-bb@xxxxx.xxx>" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Getting back into Satellites
Message-ID: <FAD144C3-3BA8-42D6-AC83-977A03C59BE7@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
It's not mandatory, but it's good practice, especially on FM where things
get crowded and only one gets through. On transponders it is good to gauge
your signal strength (especially on fragile sats like AO7), and to be able
to match uplink and downlink for Doppler. However, with caveats and a sense
of the pitfalls, experienced ops can make use of half duplex. A single 817
and an Arrow can make some neat QSOs on FO29!
73, Drew KO4MA
(AMSAT-NA VP Operations)
Sent from my iPhone
On Feb 7, 2013, at 3:33 PM, "Kevin Muenzler, WB5RUE"
<kevin@xxxxxxxxxxxxxxxxxxxxx.xxx> wrote:
> 73/all
>
> Is Full Duplex really required or just nice to have? Currently my setup
> (which doesn't include an antenna at the moment due to storms) is a Yaesu
> FT-790(uhf) and FT-290(vhf). Both do FM and SSB at about 25 watts. I've
> used to use my 290 for the old RS-12/13 and RS-15 birds along with my FT-890
> (RIP) for the 10 meter downlink so I do have "full duplex" but is it a
> necessary feature? I know it's nice to be able to hear yourself to know
> that you are even getting into the machine.
>
> 73/
>
> Kevin Muenzler, WB5RUE
> Grid EL09uf
> Eagle Creek Observatory
> http://www.eaglecreekobservatory.org
> I have not yet begun to procrastinate!
>
>
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Andrew Glasbrenner
> Sent: Thursday, February 07, 2013 11:04 AM
> To: jeffrey.embry@xxxxx.xxx
> Cc: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: Getting back into Satellites
>
> There is only one currently operable FM satellite, and many of the sats due
> to be launched this year are transponders or FM/DSB repeaters.
>
> My suggestion would be to find a Yaesu 817 to get a toe into transponders,
> and add -any- UHF receiver for full duplex FM. The little Baofeng UV3s are
> like $45 and have good receivers in them.
>
> 73, Drew KO4MA
>
> Sent from my iPhone
>
> On Feb 7, 2013, at 10:26 AM, Jeffrey Embry <jeffrey.embry@xxxxx.xxx> wrote:
>
>> Good Day all,
>>
>> After a few years hiatis, I am contemplating getting back on the
>> birds. Because I currently live in an apartment, I plan on starting
>> the easy route using an arrow antenna. My question is, since I sold
>> my last HT about a decade ago, what is recommended for the current
>> models of HTs that have full-duplex capabilities?
>>
>> 73es,
>>
>> --
>> Jeff Embry, K3OQ
>> FM19nb
>> ARCI #11643, FPQRP #-696,
>> QRP-L # 67, NAQCC #25, ARS #1733
>> AMSAT LM-2263
>>
>> --
>> Success is the ability to go from one failure to another with no loss
>> of enthusiasm. - Sir Winston Churchill
>> _______________________________________________
>> 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-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-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 11
Date: Thu, 7 Feb 2013 20:52:04 -1000
From: Robert Smith <dukenuke@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] FO29 HAWAII PASS
Message-ID: <6430429A-F2D8-4715-AD4D-B1FAF82483C2@xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Aloha All
Short notice but I will try to be on the next FO29 pass over Hawaii
at 0721Z.
73
de robert, NH7WM
------------------------------
Message: 12
Date: Fri, 08 Feb 2013 00:12:44 -0800
From: Greg D <ko6th.greg@xxxxx.xxx>
To: "Kevin Muenzler, WB5RUE" <kevin@xxxxxxxxxxxxxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Getting back into Satellites
Message-ID: <5114B37C.90500@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii; format=flowed
Hi Kevin,
With SSB, pretty much required, in order to get your Tx and Rx aligned
with each other and with the others you are talking to. It can be done
by computer with half duplex, but the operator on the other end will
probably need to work harder.
With FM it's highly recommended, not so much for frequency control, but
because it's so easy to step on someone else. Full duplex lets you know
you're not the one controlling the channel, so you can back off and let
the QSO occur.
Hope to work you some day,
Greg KO6TH
Kevin Muenzler, WB5RUE wrote:
> 73/all
>
> Is Full Duplex really required or just nice to have? Currently my setup
> (which doesn't include an antenna at the moment due to storms) is a Yaesu
> FT-790(uhf) and FT-290(vhf). Both do FM and SSB at about 25 watts. I've
> used to use my 290 for the old RS-12/13 and RS-15 birds along with my FT-890
> (RIP) for the 10 meter downlink so I do have "full duplex" but is it a
> necessary feature? I know it's nice to be able to hear yourself to know
> that you are even getting into the machine.
>
> 73/
>
> Kevin Muenzler, WB5RUE
> Grid EL09uf
> Eagle Creek Observatory
> http://www.eaglecreekobservatory.org
> I have not yet begun to procrastinate!
>
>
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Andrew Glasbrenner
> Sent: Thursday, February 07, 2013 11:04 AM
> To: jeffrey.embry@xxxxx.xxx
> Cc: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: Getting back into Satellites
>
> There is only one currently operable FM satellite, and many of the sats due
> to be launched this year are transponders or FM/DSB repeaters.
>
> My suggestion would be to find a Yaesu 817 to get a toe into transponders,
> and add -any- UHF receiver for full duplex FM. The little Baofeng UV3s are
> like $45 and have good receivers in them.
>
> 73, Drew KO4MA
>
> Sent from my iPhone
>
> On Feb 7, 2013, at 10:26 AM, Jeffrey Embry<jeffrey.embry@xxxxx.xxx> wrote:
>
>> Good Day all,
>>
>> After a few years hiatis, I am contemplating getting back on the
>> birds. Because I currently live in an apartment, I plan on starting
>> the easy route using an arrow antenna. My question is, since I sold
>> my last HT about a decade ago, what is recommended for the current
>> models of HTs that have full-duplex capabilities?
>>
>> 73es,
>>
>> --
>> Jeff Embry, K3OQ
>> FM19nb
>> ARCI #11643, FPQRP #-696,
>> QRP-L # 67, NAQCC #25, ARS #1733
>> AMSAT LM-2263
>>
>> --
>> Success is the ability to go from one failure to another with no loss
>> of enthusiasm. - Sir Winston Churchill
>> _______________________________________________
>> 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-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-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 13
Date: Fri, 08 Feb 2013 00:18:29 -0800
From: Greg D <ko6th.greg@xxxxx.xxx>
To: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID: <5114B4D5.8030200@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii; format=flowed
I wonder what 435kw at 28,000 km will do to the surface temperature on
that rock? (Assuming it's an icy thing...)
Greg KO6TH
Vince Fiscus, KB7ADL wrote:
> At 09:01 AM 2/8/2013 +1100, Tony Langdon <vk3jed@xxxxx.xxx> wrote:
>> On 8/02/13 7:49 AM, Bob- W7LRD wrote:
>>> maybe "asteroid bounce"? (EAE)
>>> 73 Bob W7LRD
>> Someone on the moonbounce reflector crunched the numbers and came up
>> with a path loss figure something like 51dB worse than EME, if I
>> recall. The small cross section area was the killer.
>>
>> --
>> 73 de Tony VK3JED
>
>
> Well from the original post:
>
>> The Goldstone 70M dish will be running MAX QRO with 435 kW.
>
>
> That ought to be enough for EAE. HAAAA. CQ asteroid, CQ asteroid!
>
> KB7ADL
>
> _______________________________________________
> 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: 14
Date: Fri, 8 Feb 2013 13:15:17 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] FO-29 Video
Message-ID:
<1360329317.83998.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
I liked this FO-29 video, ideal for running at hamfests, see
http://www.uk.amsat.org/?p=12592
73 Trevor M5AKA
AMSAT-UK http://www.amsat-uk.org/
Join or Renew your AMSAT-UK membership at
http://shop.amsat.org.uk/shop/category_7/Membership-of-AMSAT-UK.html
----
------------------------------
Message: 15
Date: Fri, 8 Feb 2013 09:30:34 -0500
From: Robert Bruninga <bruninga@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Close encounters of the Asteroidal Kind
Message-ID: <53810304930344efede4119813a0040d@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
> I wonder what 435kw at 28,000 km will do to the surface temperature on
that rock?
Let's see, power goes down as 1/R squared. So lets compare it to a
candle. A candle is about 50 Watts or about (435000/50W) or about 10,000
times less power. Take the square root of that to get about 100/th the
range.
So that radar at 28,000 km will heat the surface about as much as a candle
would at 280km. (unless I screwed up before my morning coffee)...
Bob,WB4APR
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End of AMSAT-BB Digest, Vol 8, Issue 41
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