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CX2SA > SATDIG 22.02.13 21:22l 792 Lines 25075 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: Personal Best on AO7-b (Eric Knaps, ON4HF)
2. Re: 2.4GHz broadband router on satellite? (Lee Maisel)
3. Re: 2.4GHz broadband router on satellite? (Andrew Glasbrenner)
4. CO-55 UHF beacon stuck? (Bernard Van Haecke)
5. Re: 2.4GHz broadband router on satellite? (Greg D)
6. Re: 2.4GHz broadband router on satellite? (Simone)
7. Re: CO-55 UHF beacon stuck? (Ib Christoffersen)
8. Pic of STRaND-1 smartphone CubeSat on PSLV-C20 Launcher (Trevor .)
9. Re: 2.4GHz broadband router on satellite? (Trevor .)
10. Re: CO-55 UHF beacon stuck? (Felix Rz)
11. Re: 2.4GHz broadband router on satellite? (Mark L. Hammond)
12. Re: QFHA for SO-50... polarization issue ???
(Ing. Pavel Milanes Costa)
13. Re: 2.4GHz broadband router on satellite? (Andrew Glasbrenner)
14. STRaND-1 Launch Information (Trevor .)
----------------------------------------------------------------------
Message: 1
Date: Thu, 21 Feb 2013 21:10:40 +0100 (CET)
From: "Eric Knaps, ON4HF" <on4hf@xxxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Personal Best on AO7-b
Message-ID:
<db265825-3114-4323-b2c1-e6261cb773f8@xxxxx.xxxxxxxxxxx.xx>
Content-Type: text/plain; charset=utf-8
Well done Frank!
Hope to hear you again soon.
73,
Eric.
Amateur Radio Station ON4HF
Eric Knaps
Satellite manager UBA
http://www.on4hf.be
----- Oorspronkelijk e-mail -----
Van: "K4FEG" <K4FEG@xxxxx.xxx>
Aan: amsat-bb@xxxxx.xxx
Verzonden: Donderdag 21 februari 2013 20:22:07
Onderwerp: [amsat-bb] Personal Best on AO7-b
Today at 18:59UTC myself, (K4FEG EM55aj) and Jari, OH2FQV (KP20mf), had
a successful 2way CW contact on AO7-b both signals were 559 with
approximately 1 degree (or less) of elevation on both sides of the pass.
The calculated distance on this QSO is approximately 7862Km based on a
couple of calculation programs.
Jari has an excellent station for low elevation operations and can hear
to LOS with ease.
THANK YOU JARI FOR YOUR PATIENCE AND PERSISTENCE!
Frank E. Griffin;
K4FEG EM55aj
_______________________________________________
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, 21 Feb 2013 17:58:20 -0700
From: Lee Maisel <maisel@xxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
Message-ID: <5126C2AC.9030703@xxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed
James French wrote:
> What are the possibilities of building a satellite that uses a Linksys
> WRT54GL router with a modified DD-wrt or HSMM-Mesh software as a store
> and forward BBS, to route a received request from one station to another
> station, or even to connect to a on board networked camera to receive
> images?
>
> What kind of uplink power would be needed from the home station?
>
> How fast could the speed(s) get theoretically?
>
> How big would the antenna have to be on the craft and for the ground
> station to even be able to do this adequately?
>
> Would the doppler be too much to even consider this?
>
> Would the space environment be too harsh for something like this?
>
> This is just something I was thinking about this morning and thought I
> would toss it out.
>
> James W8ISS
>
> _______________________________________________
>
THAT is an AWESOME Idea!
I don't see why it wouldn't work, I don't know if doppler is an issue
though, it may not be if the modulation is FM.
The antenna would not have to be big, it's 2.4Ghz
Why don't you post this on the HSMM-MESH.org web forums and get ideas?
73
Lee
W5LMM
--
????? ????
------------------------------
Message: 3
Date: Thu, 21 Feb 2013 20:58:56 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: Lee Maisel <maisel@xxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
Message-ID: <CF8B6B3C-8B8C-469B-8CC9-C9F95C3C2351@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=utf-8
One of the recent 3u DOD sponsored cubes has a S dish for tracking wifi type
tags on containers. I'm not sure how much lick they had with that.
73, Drew KO4MA
Sent from my iPhone
On Feb 21, 2013, at 7:58 PM, Lee Maisel <maisel@xxxx.xxx> wrote:
> James French wrote:
>> What are the possibilities of building a satellite that uses a Linksys
>> WRT54GL router with a modified DD-wrt or HSMM-Mesh software as a store
>> and forward BBS, to route a received request from one station to another
>> station, or even to connect to a on board networked camera to receive
>> images?
>>
>> What kind of uplink power would be needed from the home station?
>>
>> How fast could the speed(s) get theoretically?
>>
>> How big would the antenna have to be on the craft and for the ground
>> station to even be able to do this adequately?
>>
>> Would the doppler be too much to even consider this?
>>
>> Would the space environment be too harsh for something like this?
>>
>> This is just something I was thinking about this morning and thought I
>> would toss it out.
>>
>> James W8ISS
>>
>> _______________________________________________
> THAT is an AWESOME Idea!
>
> I don't see why it wouldn't work, I don't know if doppler is an issue
though, it may not be if the modulation is FM.
> The antenna would not have to be big, it's 2.4Ghz
>
>
> Why don't you post this on the HSMM-MESH.org web forums and get ideas?
>
> 73
> Lee
> W5LMM
>
>
> --
>
>
> ????? ????
>
> _______________________________________________
> 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: 4
Date: Thu, 21 Feb 2013 19:37:03 -0800
From: Bernard Van Haecke <bernard.vanhaecke@xxxxx.xxx>
To: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] CO-55 UHF beacon stuck?
Message-ID:
<CAD40Bmh3tVCnrFMnyrM1eoF6C9fXj=W1kcE+0pwDnE8B648BNA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hello,
This is to report that CO-55 seems to be stuck with a 100% duty cycle
carrier
on 436.825 MHz. The CW beacon was not operational during the 2013-02-22
02:07z
pass over Northern California, instead a constant carrier was heard during
the entire pass,
maximum signal S8.
Receiving station: FT-817ND, AD6IW 25dB 0.3NF preamp, Arrow antenna,
Arduino-controlled rotator, Orbitron tracking/doppler software
Not sure if this is a recent issue or not on this satellite. Is anyone
from Tokyo Institute of Technology on this list?
73 de Bernard KI6TSF
ki6tsf at amsat.org
------------------------------
Message: 5
Date: Thu, 21 Feb 2013 21:30:58 -0800
From: Greg D <ko6th.greg@xxxxx.xxx>
To: Lee Maisel <maisel@xxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
Message-ID: <51270292.7030905@xxxxx.xxx>
Content-Type: text/plain; charset=utf-8; format=flowed
Lee Maisel wrote:
> James French wrote:
>> What are the possibilities of building a satellite that uses a Linksys
>> WRT54GL router with a modified DD-wrt or HSMM-Mesh software as a store
>> and forward BBS, to route a received request from one station to another
>> station, or even to connect to a on board networked camera to receive
>> images?
>>
>> What kind of uplink power would be needed from the home station?
>>
>> How fast could the speed(s) get theoretically?
>>
>> How big would the antenna have to be on the craft and for the ground
>> station to even be able to do this adequately?
>>
>> Would the doppler be too much to even consider this?
>>
>> Would the space environment be too harsh for something like this?
>>
>> This is just something I was thinking about this morning and thought I
>> would toss it out.
>>
>> James W8ISS
>>
>> _______________________________________________
> THAT is an AWESOME Idea!
>
> I don't see why it wouldn't work, I don't know if doppler is an issue
> though, it may not be if the modulation is FM.
> The antenna would not have to be big, it's 2.4Ghz
>
>
> Why don't you post this on the HSMM-MESH.org web forums and get ideas?
>
> 73
> Lee
> W5LMM
>
>
Hi James, Lee,
If you are thinking of using standard Wi-Fi as the link protocol, be
aware that the timers that drive the protocol don't well work over long
distances (few miles). Something about the speed of light not being
fast enough. Real bummer. These would need to be adjusted, though I
think the implications for a point-point connection may not be too severe.
Besides doppler shift, which could be a problem depending on how agile
the ground station is, the modulation scheme (it's NOT simply FM) uses
about 20 mhz of bandwidth, so you will need significant power to get the
20db S/N needed to decode anything halfway reliably. Remember, a
typical AP runs 100mw on 2.4 ghz, and gets reliable communication over
distances of 100's of FEET with omni antennas. Add some gain on both
ends (so now you need attitude control on the satellite!), and you can
go a few miles. But 100's of miles to orbit? I need someone to "do the
numbers", but I bet it's not too good.
Greg KO6TH
------------------------------
Message: 6
Date: Fri, 22 Feb 2013 09:14:06 +0100
From: Simone <terrando@xxxxxxx.xx>
To: Greg D <ko6th.greg@xxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
Message-ID:
<CAKQMVSc+r4yqDVZGYE9Ccjc0aj90RKNWE+dCxQ_BMMb7Pc2Yig@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi all,
wifi over long distance is a reality on earth-based point-to-point links,
with distances up to 200miles. The long distance means long latencies, thus
the standard wifi protocol needs to be modified. It exists today
implementations of the modified protocols for the WRT54G router.
To cope with the link budget you need higher power (i.e power amplifier)
and high gain antennas, and this should not be a big deal even on a
spacecraft, although I am a bit concerned on the possibility of fitting a
high gain antenna on top of a cubesat. Maybe it would be feasible at 5GHz,
but in any case you would need 3 axes stabilization of the spacecraft.
What looks more difficult to me is the Doppler shift compensation, as the
wifi transceivers do not have (at least to my knowledge) the possibility to
fine tune the channel frequency.
I know that long range wifi has been investigated on south america to help
connecting isolated villages in the jungle, and by a group of Italian
researchers (http://www.ixem.polito.it/index_e.htm), and a high datarate
link has been established with a stratospheric balloon.
It is an interesting discussion topic, and I hope somebody with more
experience on the topic will jump into the discussion.
Simone IW1FYV
2013/2/22 Greg D <ko6th.greg@xxxxx.xxx>
> Lee Maisel wrote:
>
>> James French wrote:
>>
>>> What are the possibilities of building a satellite that uses a Linksys
>>> WRT54GL router with a modified DD-wrt or HSMM-Mesh software as a store
>>> and forward BBS, to route a received request from one station to another
>>> station, or even to connect to a on board networked camera to receive
>>> images?
>>>
>>> What kind of uplink power would be needed from the home station?
>>>
>>> How fast could the speed(s) get theoretically?
>>>
>>> How big would the antenna have to be on the craft and for the ground
>>> station to even be able to do this adequately?
>>>
>>> Would the doppler be too much to even consider this?
>>>
>>> Would the space environment be too harsh for something like this?
>>>
>>> This is just something I was thinking about this morning and thought I
>>> would toss it out.
>>>
>>> James W8ISS
>>>
>>> ______________________________**_________________
>>>
>> THAT is an AWESOME Idea!
>>
>> I don't see why it wouldn't work, I don't know if doppler is an issue
>> though, it may not be if the modulation is FM.
>> The antenna would not have to be big, it's 2.4Ghz
>>
>>
>> Why don't you post this on the HSMM-MESH.org web forums and get ideas?
>>
>> 73
>> Lee
>> W5LMM
>>
>>
>> Hi James, Lee,
>
> If you are thinking of using standard Wi-Fi as the link protocol, be aware
> that the timers that drive the protocol don't well work over long distances
> (few miles). Something about the speed of light not being fast enough.
> Real bummer. These would need to be adjusted, though I think the
> implications for a point-point connection may not be too severe.
>
> Besides doppler shift, which could be a problem depending on how agile the
> ground station is, the modulation scheme (it's NOT simply FM) uses about 20
> mhz of bandwidth, so you will need significant power to get the 20db S/N
> needed to decode anything halfway reliably. Remember, a typical AP runs
> 100mw on 2.4 ghz, and gets reliable communication over distances of 100's
> of FEET with omni antennas. Add some gain on both ends (so now you need
> attitude control on the satellite!), and you can go a few miles. But 100's
> of miles to orbit? I need someone to "do the numbers", but I bet it's not
> too good.
>
> Greg KO6TH
>
>
>
> ______________________________**_________________
> 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: 7
Date: Fri, 22 Feb 2013 10:20:08 +0100
From: "Ib Christoffersen" <oz1my@xxxxxx.xx>
To: <bernard.vanhaecke@xxxxx.xxx>, <AMSAT-BB@xxxxx.xxx>
Subject: [amsat-bb] Re: CO-55 UHF beacon stuck?
Message-ID: <839F6A99FEF245AB8C91353FF50BD3CD@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Bernhard,
It has been like that for a very long time.
Still it is easy to hear :-)
73 OZ1MY/Ib
-----Oprindelig meddelelse-----
Fra: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx P? vegne
af Bernard Van Haecke
Sendt: 22 February 2013 04:37
Til: AMSAT-BB@xxxxx.xxx
Emne: [amsat-bb] CO-55 UHF beacon stuck?
Hello,
This is to report that CO-55 seems to be stuck with a 100% duty cycle
carrier
on 436.825 MHz. The CW beacon was not operational during the 2013-02-22
02:07z
pass over Northern California, instead a constant carrier was heard during
the entire pass,
maximum signal S8.
Receiving station: FT-817ND, AD6IW 25dB 0.3NF preamp, Arrow antenna,
Arduino-controlled rotator, Orbitron tracking/doppler software
Not sure if this is a recent issue or not on this satellite. Is anyone
from Tokyo Institute of Technology on this list?
73 de Bernard KI6TSF
ki6tsf at amsat.org
_______________________________________________
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: 8
Date: Fri, 22 Feb 2013 13:44:50 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Pic of STRaND-1 smartphone CubeSat on PSLV-C20
Launcher
Message-ID:
<1361540690.66309.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
ISRO have released a picture of STRaND-1 and other CubeSats mounted on the
PSLV-C20 rocket. A launch on Feb 25 is currently expected.
See http://www.amsat-uk.org/?p=12858
----
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: 9
Date: Fri, 22 Feb 2013 15:49:59 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: Lee Maisel <maisel@xxxx.xxx>, Greg D <ko6th.greg@xxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
Message-ID:
<1361548199.14204.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Apart from power budget issues and Doppler the real killer will be the very
high noise level on 2.4 GHz.
In urban areas you can expected to receive strong WiFi signals across all of
2402-2450 almost regardless of where you beam.
Any signals from a satellite would need to be strong enough to overcome this
interference. 5 GHz is likely to suffer a similar problem in a few years as
more use is made of that band for WiFi etc.
73 Trevor M5AKA
------------------------------
Message: 10
Date: Fri, 22 Feb 2013 19:44:15 +1100
From: Felix Rz <vk3far@xxxxx.xxx>
To: bernard.vanhaecke@xxxxx.xxx
Cc: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Re: CO-55 UHF beacon stuck?
Message-ID:
<CAKVTq0mO95VZp0Ks_L1zrsuyB+MoT2hQAzG=yd1a+_88iTgUNA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Bernard
I can confirm that CO-55 has a problem on the pass at 0829 UTC at QF22IG.
It is transmitted CW (436,836 MHz) but very low in modulation so appears
almost as 100% carrier
73's Felix VK3FAR@xxxxx.xxx
On Fri, Feb 22, 2013 at 2:37 PM, Bernard Van Haecke <
bernard.vanhaecke@xxxxx.xxx> wrote:
> Hello,
>
> This is to report that CO-55 seems to be stuck with a 100% duty cycle
> carrier
> on 436.825 MHz. The CW beacon was not operational during the 2013-02-22
> 02:07z
> pass over Northern California, instead a constant carrier was heard during
> the entire pass,
> maximum signal S8.
>
> Receiving station: FT-817ND, AD6IW 25dB 0.3NF preamp, Arrow antenna,
> Arduino-controlled rotator, Orbitron tracking/doppler software
>
> Not sure if this is a recent issue or not on this satellite. Is anyone
> from Tokyo Institute of Technology on this list?
>
> 73 de Bernard KI6TSF
> ki6tsf at amsat.org
> _______________________________________________
> 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: Fri, 22 Feb 2013 11:20:13 -0500
From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
To: "Trevor ." <m5aka@xxxxx.xx.xx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
Message-ID:
<CAPRXzypRrZDJ0dBH7B5YixeaAzFEq0-6xujLiyrhe9OD1ep6cg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Maybe Drew KO4MA will reply--but I thought he did some "global
listening" on 2.4GHz with AO-51 (frequency agile receiver). Seems
like he published some plots in The Journal?
Take home from what I recall--it was very noisy!
Mark N8MH
On Fri, Feb 22, 2013 at 10:49 AM, Trevor . <m5aka@xxxxx.xx.xx> wrote:
> Apart from power budget issues and Doppler the real killer will be the
very high noise level on 2.4 GHz.
>
> In urban areas you can expected to receive strong WiFi signals across all
of 2402-2450 almost regardless of where you beam.
>
> Any signals from a satellite would need to be strong enough to overcome
this interference. 5 GHz is likely to suffer a similar problem in a few
years as more use is made of that band for WiFi etc.
>
> 73 Trevor M5AKA
>
>
> _______________________________________________
> 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
--
Mark L. Hammond [N8MH]
------------------------------
Message: 12
Date: Fri, 22 Feb 2013 11:21:46 -0500
From: "Ing. Pavel Milanes Costa" <pavel@xxxxx.xx>
To: i8cvs <domenico.i8cvs@xxx.xx>
Cc: Amsat - BBs <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: QFHA for SO-50... polarization issue ???
Message-ID: <51279B1A.9030207@xxxxx.xx>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
Yes, thanks for the quote...
And sorry, I'm a Spanish speaking OM... When I said:
"...I need RHCP & LHCP switchable antennas..."
I was referring to two separate QFHA, one with RHCP and the other LHCP,
with a coaxial switch... just like you mention...
I have to improve my grammar in English... hi hi hi..
BTW thanks for the articles of Maxwel and I'm viewing the site right now...
73
El 19/02/13 02:14, i8cvs escribi?:
> ----- Original Message -----
> From: "Ing. Pavel Milanes Costa" <pavel@xxxxx.xx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Monday, February 18, 2013 9:29 PM
> Subject: [amsat-bb] Re: QFHA for SO-50... polarization issue ???
>
>> Thanks to all for the reply to this thread...
>>
>> Conclusion is that I need RHCP & LHCP switchable antennas...
>>
>> 73 and Thanks to all.
>>
>> 73 de CO7WT.
> Hi Pavel, CO7WT
>
> The QFHA is not a switchable antenna from RHCP to LHCP because
> RHCP is wound with turns conterclockwise and LHCP is wounded with
> turns clockwise just the reverse of the classic W8JK helical antenna.
>
> If you like RHCP and LHCP polarizations you need two separate
> antennas swichable with a coax relay.
>
> In a separate email I have sent to you the best original article on helix
> antennas written by Walter Maxell W2DU.
>
> More information on QFH antennas from W2DU are available here:
>
> http://w2du.com/
>
> 73" de i8CVS Domenico
>
>
>
------------------------------
Message: 13
Date: Fri, 22 Feb 2013 11:51:05 -0500 (GMT-05:00)
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: "Mark L. Hammond" <marklhammond@xxxxx.xxx>, "Trevor ."
<m5aka@xxxxx.xx.xx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
Message-ID:
<12965530.1361551866351.JavaMail.root@xxxxxxxxxxxxx.xxx.xx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Close, but not on 2.4Ghz. We did that on 2m, 70cm, and 33cm.
Aeneas was the satellite I was thinking of that had a WiFi-like payload.
http://viterbi.usc.edu/news/news/2012/usc-viterbi-s366666.htm
73, Drew KO4MA
-----Original Message-----
>From: "Mark L. Hammond" <marklhammond@xxxxx.xxx>
>Sent: Feb 22, 2013 11:20 AM
>To: "Trevor ." <m5aka@xxxxx.xx.xx>
>Cc: amsat-bb <amsat-bb@xxxxx.xxx>
>Subject: [amsat-bb] Re: 2.4GHz broadband router on satellite?
>
>Maybe Drew KO4MA will reply--but I thought he did some "global
>listening" on 2.4GHz with AO-51 (frequency agile receiver). Seems
>like he published some plots in The Journal?
>
>Take home from what I recall--it was very noisy!
>
>Mark N8MH
>
>On Fri, Feb 22, 2013 at 10:49 AM, Trevor . <m5aka@xxxxx.xx.xx> wrote:
>> Apart from power budget issues and Doppler the real killer will be the
very high noise level on 2.4 GHz.
>>
>> In urban areas you can expected to receive strong WiFi signals across all
of 2402-2450 almost regardless of where you beam.
>>
>> Any signals from a satellite would need to be strong enough to overcome
this interference. 5 GHz is likely to suffer a similar problem in a few
years as more use is made of that band for WiFi etc.
>>
>> 73 Trevor M5AKA
>>
>>
>> _______________________________________________
>> 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
>
>
>
>--
>Mark L. Hammond [N8MH]
>_______________________________________________
>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, 22 Feb 2013 19:58:04 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] STRaND-1 Launch Information
Message-ID:
<1361563084.10058.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
>From Twitter https://twitter.com/SpaceAtSurrey
Official launch hashtag of STRaND-1 spacecraft is #S1Launch. Post lunch we
will be using #STRaND1 hashtag. Launch time:12.25 GMT 25th Feb 2013
#UniOfSurrey #SSTL
Launch Authorisation Board (LAB) for PSLV - C20 @xxxxxx mission has cleared
the launch on Monady, Feb 25, 2013. @xxxxxxxxxx of surrey #S1Launch
Just been given new / different live video launch feeds for Monday's PSLV
launch http://www.webcast.gov.in/live/ and http://ibnlive.in.com/livetv/
Launch time correction - 12.25 [UT] on Monday, not 12.35. Our typo...
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STRaND-1 telemetry format http://www.amsat-uk.org/?page_id=12875
STRaND-1 information http://www.amsat-uk.org/?page_id=12196
73 Trevor M5AKA
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End of AMSAT-BB Digest, Vol 8, Issue 56
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