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CX2SA > SATDIG 05.05.10 20:08l 491 Lines 15567 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: S Band interference was RE: Re: Field Day mode for AO-51
(Luc Leblanc)
2. Re: [eu-amsat] Re: Re: Indian Small Satellite Systems
Conference -1 (Bruce Robertson)
3. FO-29? (Bob Cutter)
4. EN56 in May ??? (Alvaro de Leon Romo)
5. Re: S Band interference was RE: Re: Field Day mode for AO-51
(Bob- W7LRD)
6. IARU Amateur Services Spectrum Requirements Updated (Trevor .)
----------------------------------------------------------------------
Message: 1
Date: Wed, 05 May 2010 11:42:40 -0400
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] Re: S Band interference was RE: Re: Field Day mode
for AO-51
To: amsat-bb@xxxxx.xxx
Message-ID: <4BE159B0.15945.7EBA33@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=US-ASCII
Just to add to my previous post S band on Field Day should normally get less
QRM as most of the sites are outside cities and WI-FI
interference is much more low in country location.
One experiment i will try on the next S band mode on AO-51 is to used a band
pass cavity filter to see if adding some filtering this wide
spread WI-FI and other 2.4Ghz device interference can be lowered to some
extent hoping this will have an effect of the front end
sensitivity of the downconverter. There is not much that we can do if the
QRM is directly on the receiving 2401 frequencies but if it is
possible to minimized any desensing effect "could be" it can help?
>
> Joe,
>
> My neighbors have several "wireless" devices that operate close
> enough to our frequencies to raise my noise level or produce a series of
> clicks and other noises. The worst offenders are a wireless network and a
> cordless phone. During the AO-40 era I bought a cordless phone from a
> neighbor that was very troublesome. I have since moved to a country
> location, and find it interesting that I can tell what direction town is by
> moving my antenna (pointed at the horizon) and listening to the noise level
> on mode S.
>
> 73,
> Joe kk0sd
> Hi Joe
>
> Your comment about Mode S interference interests me
> I have not been on since AO-40
> In those days there was no interference on mode S.
> Unless it was another Ham.
> Would you kindly explain?
>
> Thanks
>
> Joe K0VTY
> ===================
> On Tue, 4 May 2010 22:22:54 -0500 "Gary \"Joe\" Mayfield"
and S band is becoming too full of interference.
> > "-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 2
Date: Wed, 5 May 2010 13:29:40 -0300
From: Bruce Robertson <ve9qrp@xxxxx.xxx>
Subject: [amsat-bb] Re: [eu-amsat] Re: Re: Indian Small Satellite
Systems Conference -1
To: Thomas Frey <th.frey@xxxxxxx.xx>
Cc: amsat-bb@xxxxx.xxxx eu-amsat@xxxxxxxxxxx.xxx
Message-ID:
<g2j49657a761005050929ub78d6e5eye2c4b80980cbb168@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
On Wed, May 5, 2010 at 6:05 AM, Thomas Frey <th.frey@xxxxxxx.xx> wrote:
> Luc Leblanc schrieb:
>>
>>>
>>>> Hi All
>>>>
>>>
>>>> Amsat India has 2 linear tranponders ready and we Amsat India are asking
>>>> ISRO for a higher orbit to cover a larger foot print and longer pass
>>>> duration.
>>>>
>>>> Best regards
>>>> Pop
>>>> VU2POP
>>>> Dir Technical
>>>> Amsat India
>>>>
>>> Hi Pop, VU2POP
>>>
>>> I am very happy to know that AMSAT India plan to launch a new
>>> satellite with 2 linear transponders in a higher orbit covering ?a
>>> larger foot print in comparison of the actual VO-52
>>>
>>> VO-52 continually operating with its linear transponders during all
>>> available orbits is a reliable satellite for the amateur radio satellite
>>> communications and ?as well for educational purposes.
>>>
>>> Congratulations to Amsat India and to ISRO
>>>
>>> 73" de
>>>
>>> i8CVS Domenico
>>>
>>>
>>>
>>>
>> With a little more "push" is it possible to have just a slightly
elliptical orbit? I don't know what brand of batteries they put in VO-52
>> but they probably put a small pink rabbit in it as they don't seems to
bother too much with their power budget...
>>
>> What's is funny is the commenting on the perf board model AMSAT-India was
showing couple of years before the launch of VO-52, some where
>> commenting on the jumper wire perf board modelling as if it was not
something who will never be able to work...
>>
>> AMSAT-INDIA just doing an excellent and professional job on VO-52 they
even put 2 transponder in the same satellite "too strong never
>> broke". I'm convince their new orbit will cover quite some area on earth..
>>
>>
>> "-"
>>
>>
>> Luc Leblanc VE2DWE
>> Skype VE2DWE
>> www.qsl.net/ve2dwe
>> DSTAR urcall VE2DWE
>> WAC BASIC CW PHONE SATELLITE
>>
>>
> If you carefully read, AMSAT-India has 2 Linear-Transponders ready
> and not a satellite. As you knows, the satellite VO-52 itself was built
> and contributed by ISRO to AMSAT-India.
>
> If you want a satellite in HEO then support Phase-3E from AMSAT-DL.
>
> --
>
> Best Regards, 73
> ? ? Thomas Frey, HB9SKA
> ______________________________________________________________________
I might have missed something, Thomas, but I believe Luc recommended a
'slightly elliptical orbit', not necessarily a HEO one. Do these need
to be the same thing? An elliptical MEO would allow for periods of
more challenging operation with better opportunities for DX
alternating with periods of lower pass loss, but smaller footprint.
This might well be something that AMSAT-India could come to ISRO to
ask for.
Of course, none of this takes away from the excellent work of AMSAT-DL
on P3E, which we all eagerly support.
73, Bruce
VE9QRP
--
http://ve9qrp.blogspot.com
------------------------------
Message: 3
Date: Wed, 5 May 2010 10:52:34 -0700 (PDT)
From: Bob Cutter <ki0g@xxxxx.xxx>
Subject: [amsat-bb] FO-29?
To: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID: <149415.50995.qm@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Is it operational?
73, Bob KI?G
------------------------------
Message: 4
Date: Wed, 5 May 2010 12:53:48 -0500
From: Alvaro de Leon Romo <xe2at@xxxxxxx.xxx>
Subject: [amsat-bb] EN56 in May ???
To: <amsat-bb@xxxxx.xxx>
Message-ID: <SNT137-w9B85CC09B6C072DEADE90F5F40@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi I am looking the guy that travel to EN56 in May , unfortunately I lost
his email and call :-(
Many thanks in advance, like always
Al XE2AT
_________________________________________________________________
Enciende tu hotness con Hotmail
www.hotmailhotness.com.mx
------------------------------
Message: 5
Date: Wed, 5 May 2010 18:00:07 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Subject: [amsat-bb] Re: S Band interference was RE: Re: Field Day mode
for AO-51
To: "Gary \\\"Joe\\\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<1303079862.13920461273082407219.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxx
xxx.xxx>
Content-Type: text/plain; charset=utf-8
What I did some time ago was I told some neighbors that can hear the signal
from their device, and that other hams can do the same.? I did not tell them
it was just?clicks and noise.? A short time later things got quieter.
73 Bob W7LRD
?Original Message -----
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Wednesday, May 5, 2010 4:19:35 AM GMT -08:00 US/Canada Pacific
Subject: [amsat-bb] S Band interference was RE: Re: Field Day mode for AO-51
Joe,
????????My neighbors have several "wireless" devices that operate close
enough to our frequencies to raise my noise level or produce a series of
clicks and other noises. ?The worst offenders are a wireless network and a
cordless phone. ?During the AO-40 era I bought a cordless phone from a
neighbor that was very troublesome. ?I have since moved to a country
location, and find it interesting that I can tell what direction town is by
moving my antenna (pointed at the horizon) and listening to the noise level
on mode S.
73,
Joe kk0sd
-----Original Message-----
From: Joe v Murray [mailto:k0vty@xxxx.xxxx
Sent: Tuesday, May 04, 2010 10:43 PM
To: gary_mayfield@xxxxxxx.xxx
Subject: Re: [amsat-bb] Re: Field Day mode for AO-51
Hi Joe
Your comment about Mode S interference interests me
I have not been on since AO-40
In those days there was no interference on mode S.
Unless it was another Ham.
Would you kindly explain?
Thanks
Joe K0VTY
===================
On Tue, 4 May 2010 22:22:54 -0500 "Gary \"Joe\" Mayfield"
<gary_mayfield@xxxxxxx.xxx> writes:
> I have L band gear. ?When the bird is in L/U Luc and I have a great
> time
> talking to each other. ?When the bird is in V/U I'll make half a
> dozen or
> more contacts in a pass. ?I voted for mode L, because I didn't
> believe V/U
> was an option and S band is becoming too full of interference.
> ?
> I have a couple questions:
>
> 1. ?The folks who can't eek out a contact with the handheld and
> Arrow during
> Field Day, have you practiced? ?It's how I have done it the last
> couple of
> years without that much trouble, patience and timing are the keys
> :-). ?We
> have a good Field Day location where I can see down to the horizon.
>
> 2. ?Has the single contact per FM bird rule really helped anyone? ?
> In the
> old days a couple big stations got on and essentially ran the bird. ?
> Is it
> fair? ?NO! but they handed out a lot of QSOs and we seemed to get
> more AMSAT
> Field Day entries as well.
>
> The one bird one contact has been a noble experiment, maybe it is
> time to
> examine the results.
>
> Hats off to the controllers for starting the discussion!
>
> 73, Just My Thoughts,
> Joe kk0sd
>
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx
> On
> Behalf Of Andrew Glasbrenner
> Sent: Monday, May 03, 2010 4:33 PM
> To: Ng, Peter
> Cc: amsat-bb@xxxxx.xxxx ao51-modes@xxxxx.xxx
> Subject: [amsat-bb] Re: Field Day mode for AO-51
>
> Ng, Peter wrote:
> > ...sorry, I meant to vote for V/U mode as I only have VHF/UHF
> equipment!
> >
> > ?
> Keep in mind there will likely be three or four transponders birds,
> and
> two to four other FM birds available that weekend!
>
> It's been my perception that a good portion of AMSAT's sustaining
> members leave and breathe the highest tech they can manage. Eight
> out of
> eight satellites being V/U seems counter to that goal.
>
> Mark and Bob both make good points supporting at least one area of
> refuge for this portion of the AMSAT population. Personally, I think
> the
> V/U FM experience on Field Day is a big turnoff to newbies,
> especially
> since so many under-prepared, over-powered and out of practice
> once-a-year sat ops fail miserably to get those bonus points on FM.
>
> I bet someone in your area has 1.2 Ghz capability!
>
> 73, Drew KO4MA
> _______________________________________________
> 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
>
>
?
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_______________________________________________
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------------------------------
Message: 6
Date: Wed, 5 May 2010 18:06:08 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] IARU Amateur Services Spectrum Requirements
Updated
To: amsat-bb@xxxxx.xxx
Message-ID: <96860.76386.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Revised requirements for the Amateur and Amateur Satellite Services are now
available on the IARU website at
http://www.iaru.org/ac-09spec.pdf
Of interest to the Amateur Satellite community are:
3.10 50?54 MHz The Amateur Service requires retention of the exclusive
50-MHz allocation where it now exists, and provision of an allocation of at
least 2 MHz in other geographic areas, with at least 500 kHz on an exclusive
basis. A harmonised allocation for the Amateur Satellite Service is also
sought, to bridge the gap between 28 MHz and 144 MHz.
3.12 420-450 MHz The Amateur Service requires retention of the existing
allocations in the 420-450 MHz band and opposes new uses by other services
or low-power devices except where sharing or compatibility studies have been
satisfactorily concluded.
The Amateur-Satellite Service relies heavily on the sub-band 435-438 MHz,
which presently is the only space-to-Earth amateur allocation between 146
MHz and 2.4 GHz. Because of the crowding of the existing band 435-438 MHz
with unmanned amateur satellites and manned space stations, it is desirable
to study expansion of the band.
Sharing in this band with the Radiolocation Service has been successful over
many decades because of geographic separation and other factors. Recently,
in the United States there has been interference from amateur stations to
radiolocation stations, which has been resolved on a case-by-case basis by
mitigation techniques or by taking amateur repeaters off the air.
A growing concern to the Amateur Service is the proliferation of low power
devices in the ISM band 433.05-434.79 MHz (centre frequency 433.92 MHz)
permitted in some European countries under RR No. 5.280.
3.13 1240-1300 MHz
The Amateur Service seeks retention of the band 1240-1300 MHz. The
Amateur-Satellite Service seeks retention of the band 1260-1270 MHz and
deletion of the "Earth-to-space only" restriction.
WRC-2000 allocated the band 1240-1300 MHz to the
radiodetermination-satellite service for space-to-space use. In addition,
WRC-2000 allocated the band 1260-1300 MHz to the
radiodetermination-satellite service for space-to-Earth use such as for the
European Galileo positioning system. These actions do not change the Amateur
and Amateur-Satellite Service allocations but present new sharing situations
and potential operating restrictions.
It is particularly good to see the inclusive of an Amateur Satellite Service
allocation at 50 MHz.
Hopeful satellite users and AMSAT organisations will continuing working
through their National Societies
I sure we could all think of some other "it would be nice to have"
allocations for the Amateur Satellite Service such as 1240-1250 and
2390-2400 but achieving the above is a good first step.
73 Trevor M5AKA
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----
------------------------------
_______________________________________________
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!
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End of AMSAT-BB Digest, Vol 5, Issue 206
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