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CX2SA > SATDIG 16.06.12 21:04l 457 Lines 16891 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V7 193
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Sent: 120616/1902Z @:CX2SA.SAL.URY.SA #:61478 [Salto] FBB7.00e $:AMSATBB7193
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: perfect groundtrack contest (Bob- W7LRD)
2. Re: perfect groundtrack contest (Howie DeFelice)
3. Re: perfect groundtrack contest (i8cvs)
4. Spacelab ? STS-50 Mission 1992 Video (Trevor .)
5. US Towers TMM-433HD for sale (David Reinhart)
6. 2M1EUB/P QRV 24 JUNE-JULY 8 (loc) IO76/77/87/86 (paul robinson)
7. Re: perfect groundtrack contest (Howie DeFelice)
8. Re: US Towers TMM-433HD for sale (George Henry)
----------------------------------------------------------------------
Message: 1
Date: Fri, 15 Jun 2012 21:18:46 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: Howie DeFelice <howied231@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: perfect groundtrack contest
Message-ID:
<1696406983.1174849.1339795126912.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxx
xxxx.xxx>
Content-Type: text/plain; charset=utf-8
I have also "wondered" if any of the older commercial surplus satellites can
be "reprogrammed"? for our use.? I realized that idea is no doubt an over
simplification.? Today's speculation can be tomorrows reality.
73 Bob W7LRD
----- Original Message -----
From: "Howie DeFelice" <howied231@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxxx tomdoyle1948@xxxxx.xxx
Sent: Thursday, June 14, 2012 12:48:06 PM
Subject: [amsat-bb] perfect groundtrack contest
I vote for Intelsat G-11 at 304.5 deg E. This is a Ku band only bird,
however, the semi-retired Intelsat 805, which is co-located with this sat
has a global C band beam with a downlink that extends into the amateur 9cm
satellite band (3400-3410 MHz). I often wondered if Intelsat would consider
"donating" a few Khz ?to AMSAT. We could then tie a single, commercially
licensed uplink station via echolink and hear it on the 9cm downlink. At
least it would be a reason for people to use the 9cm band before it's taken
away for the latest mobile broadband gizmo.
Howie AB2S
????????????????? ???????? ? ???????????????? ?
_______________________________________________
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: Fri, 15 Jun 2012 17:31:37 -0400
From: Howie DeFelice <howied231@xxxxxxx.xxx>
To: <w7lrd@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: perfect groundtrack contest
Message-ID: <BLU169-W122CC7CCC3C2C46A2CF3AE4E7FB0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Unfortunately the hardware on board isn't programmable. The shared antenna's
are connected to very frequency specific bandpass filters that form the
multiplexer, the frequency translators are fixed and if the HPA is a TWTA it
is also very frequency dependent. By the time the commercial operators are
done squeezing every last penny out of them, there isn't much left over to
use anyway :)
- Howie AB2S
Date: Fri, 15 Jun 2012 21:18:46 +0000
From: w7lrd@xxxxxxx.xxx
To: howied231@xxxxxxx.xxx
CC: amsat-bb@xxxxx.xxxx tomdoyle1948@xxxxx.xxx
Subject: Re: [amsat-bb] perfect groundtrack contest
I have also "wondered" if any of the older commercial surplus satellites can
be "reprogrammed" for our use. I realized that idea is no doubt an over
simplification. Today's speculation can be tomorrows reality.
73 Bob W7LRD
From: "Howie DeFelice" <howied231@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxxx tomdoyle1948@xxxxx.xxx
Sent: Thursday, June 14, 2012 12:48:06 PM
Subject: [amsat-bb] perfect groundtrack contest
I vote for Intelsat G-11 at 304.5 deg E. This is a Ku band only bird,
however, the semi-retired Intelsat 805, which is co-located with this sat
has a global C band beam with a downlink that extends into the amateur 9cm
satellite band (3400-3410 MHz). I often wondered if Intelsat would consider
"donating" a few Khz to AMSAT. We could then tie a single, commercially
licensed uplink station via echolink and hear it on the 9cm downlink. At
least it would be a reason for people to use the 9cm band before it's taken
away for the latest mobile broadband gizmo.
Howie AB2S
_______________________________________________
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: Sat, 16 Jun 2012 01:02:57 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Howie DeFelice" <howied231@xxxxxxx.xxx>, <w7lrd@xxxxxxx.xxx>
Cc: Amsat - BBs <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: perfect groundtrack contest
Message-ID: <001f01cd4b4b$0142d540$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Hovie,AB2S
You are correct but there is another reason that make very difficult to
use a commercial satellites for amateur communications.
The Amateur Satellites and our ground stations are FDMA i.e Frequency
Division Multiple Access in wich the satellite passband is shared at the
same Time by all ground users depending on the frequency that they
chouses for the uplink and downlink.
On the other side the Commercial Satellites are mostly TDMA i.e. Time
Division Multiple Access in wich a master Ground Stations send to the
satellite transponder the sincronization pulses to switch the onboard
multiplexer at very high speed and specific Time between all client ground
stations as explained in the following web page.
http://www.satsig.net/vsat-equipment/tdma-explanation.htm
In simple word the TDMA often called "switcher" operate as a citizen
Telephone Central Station that is not on earth but on board of the
satellite.
73" de
i8CVS Domenico
----- Original Message -----
From: "Howie DeFelice" <howied231@xxxxxxx.xxx>
To: <w7lrd@xxxxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Friday, June 15, 2012 11:31 PM
Subject: [amsat-bb] Re: perfect groundtrack contest
>
> Unfortunately the hardware on board isn't programmable. The shared
> antenna's are connected to very frequency specific bandpass filters that
> form the multiplexer, the frequency translators are fixed and if the HPA
> is a TWTA it is also very frequency dependent. By the time the commercial
> operators are done squeezing every last penny out of them, there isn't
> much left over to use anyway :)
>
> - Howie AB2S
>
> Date: Fri, 15 Jun 2012 21:18:46 +0000
> From: w7lrd@xxxxxxx.xxx
> To: howied231@xxxxxxx.xxx
> CC: amsat-bb@xxxxx.xxxx tomdoyle1948@xxxxx.xxx
> Subject: Re: [amsat-bb] perfect groundtrack contest
>
> I have also "wondered" if any of the older commercial surplus satellites
> can be "reprogrammed" for our use. I realized that idea is no doubt an
> over simplification. Today's speculation can be tomorrows reality.
> 73 Bob W7LRD
>
>
>
> From: "Howie DeFelice" <howied231@xxxxxxx.xxx>
> To: amsat-bb@xxxxx.xxxx tomdoyle1948@xxxxx.xxx
> Sent: Thursday, June 14, 2012 12:48:06 PM
> Subject: [amsat-bb] perfect groundtrack contest
>
>
> I vote for Intelsat G-11 at 304.5 deg E. This is a Ku band only bird,
> however, the semi-retired Intelsat 805, which is co-located with this sat
> has a global C band beam with a downlink that extends into the amateur 9cm
> satellite band (3400-3410 MHz). I often wondered if Intelsat would
> consider "donating" a few Khz to AMSAT. We could then tie a single,
> commercially licensed uplink station via echolink and hear it on the 9cm
> downlink. At least it would be a reason for people to use the 9cm band
> before it's taken away for the latest mobile broadband gizmo.
>
> Howie AB2S
------------------------------
Message: 4
Date: Sat, 16 Jun 2012 10:54:43 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Spacelab ? STS-50 Mission 1992 Video
Message-ID:
<1339840483.72028.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
See http://www.uk.amsat.org/8308
73 Trevor M5AKA
AMSAT-UK International Space Colloquium Sept. 15-16
http://www.uk.amsat.org/colloquium/twelve
AMSAT-UK News on Twitter: http://twitter.com/AMSAT_UK
----
------------------------------
Message: 5
Date: Sat, 16 Jun 2012 07:49:55 -0400 (EDT)
From: David Reinhart <wa6ilt@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] US Towers TMM-433HD for sale
Message-ID: <48a74e26.34c623.137f520cb57.Webtop.46@xxxxxxx.xxx>
Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=no
Crank-down, fold-over tower with coax arms, inverted vee arm and steel
mast for sale on ground in Holden, MA. Complete except for anchor
bolts. Over $3,000 new from US Tower, asking $2,000 or make offer.
Buyer must pick up. The town is never going to let me put this thing up
and my XYL won't let me fight the zoning board, so it's got to go.
Contact wa6ilt@xxxxx.xxx.
73,
Dave
------------------------------
Message: 6
Date: Sat, 16 Jun 2012 12:53:42 +0100 (BST)
From: paul robinson <pushbiker2004@xxxxx.xx.xx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] 2M1EUB/P QRV 24 JUNE-JULY 8 (loc) IO76/77/87/86
Message-ID:
<1339847622.69463.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Hi Guys,its that time yet again...2weeks in scotland,fun begins 24/6?? ill
be driving round scotland and hope to be qrv from any spots i can hit the
birds from,grid sq covered should be io76 io77 io87 and io86 and may be more
if i have the time...will be about for 2weeks till about july 08 opperations
as normal from van see qrz..
will be qrv all sats...inc ao7 a and b...73 de paul 2M1EUB///2E1EUB
------------------------------
Message: 7
Date: Sat, 16 Jun 2012 13:02:33 -0400
From: Howie DeFelice <howied231@xxxxxxx.xxx>
To: <domenico.i8cvs@xxx.xx>, <w7lrd@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: perfect groundtrack contest
Message-ID: <BLU169-W835470C36596FE1E7D0B83E7FA0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Domenico,
Thanks for the link. Most of the commercial GEO satellites in orbit are bent
pipe translators, similar to the amateur linear transponders. Only in very
few satellites in recent years have used on board processing and switching.
The Intelsat IRIS payload, the INMARSAT F4 satellites supporting the BGAN
system, and the ViaSat-1 satellite are some of the recent satellites that
use various forms of on board switching. Most VSAT networks have the
hub/control on the ground. All remote to remote connection are "double hop".
Only remote to hub are single hop. There are some systems that are full mesh
and allow single hop remote to remote communications.
Commercial bent pipe transponders are typically 36 to 72 MHz. wide and are
very linear. Each satellite typically divides their available 500 MHz of C
or Ku bandwidth into transponders. The frequency can be 100% reused by using
polarization diversity. They usually have fixed gain on the transponder
controlled by uplink attenuators and downlink gain settings. It is up to
the satellite operator to be sure that the total power of all the
transponder users does not saturate the transponder SSPA. In almost all
cases, this is a manual operation and if a single uplink site is
transmitting too much power that user needs to be contacted and the
offending station adjusted, really not much different than ham radio :) VSAT
network operators can usually control the transmit power of their remote
sites from the hub station. The current major GEO operators have an average
of 80% capacity utilization. The going price for GEO capacity is in the
range of $5,000 to $10,000 per Mhz. per month!
.
-Howie AB2S
> From: domenico.i8cvs@xxx.xx
> To: howied231@xxxxxxx.xxxx w7lrd@xxxxxxx.xxx
> CC: amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Re: perfect groundtrack contest
> Date: Sat, 16 Jun 2012 01:02:57 +0200
>
> Hi Hovie,AB2S
>
> You are correct but there is another reason that make very difficult to
> use a commercial satellites for amateur communications.
>
> The Amateur Satellites and our ground stations are FDMA i.e Frequency
> Division Multiple Access in wich the satellite passband is shared at the
> same Time by all ground users depending on the frequency that they
> chouses for the uplink and downlink.
>
> On the other side the Commercial Satellites are mostly TDMA i.e. Time
> Division Multiple Access in wich a master Ground Stations send to the
> satellite transponder the sincronization pulses to switch the onboard
> multiplexer at very high speed and specific Time between all client ground
> stations as explained in the following web page.
>
> http://www.satsig.net/vsat-equipment/tdma-explanation.htm
>
> In simple word the TDMA often called "switcher" operate as a citizen
> Telephone Central Station that is not on earth but on board of the
> satellite.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Howie DeFelice" <howied231@xxxxxxx.xxx>
> To: <w7lrd@xxxxxxx.xxx>
> Cc: <amsat-bb@xxxxx.xxx>
> Sent: Friday, June 15, 2012 11:31 PM
> Subject: [amsat-bb] Re: perfect groundtrack contest
> >
> > Unfortunately the hardware on board isn't programmable. The shared
> > antenna's are connected to very frequency specific bandpass filters that
> > form the multiplexer, the frequency translators are fixed and if the HPA
> > is a TWTA it is also very frequency dependent. By the time the commercial
> > operators are done squeezing every last penny out of them, there isn't
> > much left over to use anyway :)
> >
> > - Howie AB2S
> >
> > Date: Fri, 15 Jun 2012 21:18:46 +0000
> > From: w7lrd@xxxxxxx.xxx
> > To: howied231@xxxxxxx.xxx
> > CC: amsat-bb@xxxxx.xxxx tomdoyle1948@xxxxx.xxx
> > Subject: Re: [amsat-bb] perfect groundtrack contest
> >
> > I have also "wondered" if any of the older commercial surplus satellites
> > can be "reprogrammed" for our use. I realized that idea is no doubt an
> > over simplification. Today's speculation can be tomorrows reality.
> > 73 Bob W7LRD
> >
> >
> >
> > From: "Howie DeFelice" <howied231@xxxxxxx.xxx>
> > To: amsat-bb@xxxxx.xxxx tomdoyle1948@xxxxx.xxx
> > Sent: Thursday, June 14, 2012 12:48:06 PM
> > Subject: [amsat-bb] perfect groundtrack contest
> >
> >
> > I vote for Intelsat G-11 at 304.5 deg E. This is a Ku band only bird,
> > however, the semi-retired Intelsat 805, which is co-located with this sat
> > has a global C band beam with a downlink that extends into the amateur 9cm
> > satellite band (3400-3410 MHz). I often wondered if Intelsat would
> > consider "donating" a few Khz to AMSAT. We could then tie a single,
> > commercially licensed uplink station via echolink and hear it on the 9cm
> > downlink. At least it would be a reason for people to use the 9cm band
> > before it's taken away for the latest mobile broadband gizmo.
> >
> > Howie AB2S
>
------------------------------
Message: 8
Date: Sat, 16 Jun 2012 11:45:42 -0700 (PDT)
From: George Henry <ka3hsw@xxx.xxx>
To: wa6ilt@xxxxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: US Towers TMM-433HD for sale
Message-ID: <1339872342.88679.YahooMailRC@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Don't give up so easily...? Massachusetts is one of the states that has
codified
PRB-1 into state law, so your fight should be easier than in a state where one
has to go thru the federal courts.? Does Holden have an antenna ordinance, and
if so, what does it say?? What steps have you taken so far, and what has been
the outcome???Remember, the FCC & the courts have said that any "balancing
test"
is not allowed, arbitrary height limits do NOT meet the requirement of
"reasonable accomodation" and "minimum practicable regulation", and under no
circumstance can the municipality's actions have the effect of precluding
amateur communication.
George, KA3HSW
PS - your XYL is wrong:? if you don't fight for your rights, who will?
----- Original Message ----
> From: David Reinhart <wa6ilt@xxxxxxx.xxx>
> To: amsat-bb@xxxxx.xxx
> Sent: Sat, June 16, 2012 7:02:20 AM
> Subject: [amsat-bb] US Towers TMM-433HD for sale
>
> Crank-down, fold-over tower with coax arms, inverted vee arm and steel
mast for
>sale on ground in Holden, MA.? Complete except for anchor bolts.? Over $3,000
>new from US Tower, asking $2,000 or make offer. Buyer must pick up.? The
town is
>never going to let me put this thing up and my XYL won't let me fight the
zoning
>board, so it's got to go. Contact wa6ilt@xxxxx.xxx.
>
> 73,
>
> Dave
------------------------------
_______________________________________________
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 7, Issue 193
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