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CX2SA > SATDIG 24.06.09 01:09l 347 Lines 10689 Bytes #999 (0) @ WW
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Today's Topics:
1. AMSAT on Twitter (Andrew Glasbrenner)
2. Re: AMSAT on Twitter (Alan P. Biddle)
3. Re: AMSAT on Twitter (n3tl@xxxxxxxxx.xxxx
4. WTB: Bird 4410-15 dlement (Joe W2KJ)
5. Re: AO-51 L/U (David - KG4ZLB)
6. Re: AO-51 L/U (Gould Smith)
7. Phase shift keying question (n8bbq@xxxxxxxxxx.xxxx
----------------------------------------------------------------------
Message: 1
Date: Mon, 22 Jun 2009 17:16:23 -0400
From: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] AMSAT on Twitter
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <E603CAB54C8F4C1A87427E6251C0B3D9@xxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
AMSAT now has a Twitter account, and can be found at
http://twitter.com/AMSAT . I'll try to tweet things too small for ANS or
email, but of interest to the general AMSAT community. To begin with they
may be mostly about AO-51 and AO-7. All are welcome to follow us.
73, Drew KO4MA
AMSAT VP Ops
------------------------------
Message: 2
Date: Mon, 22 Jun 2009 16:22:41 -0500
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
Subject: [amsat-bb] Re: AMSAT on Twitter
To: "'AMSAT-BB'" <amsat-bb@xxxxx.xxx>
Message-ID: <F53747DD6361476BA195E6550A021D7D@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
The Twitter feed to RSS works well, also.
Alan
WA4SCA
------------------------------
Message: 3
Date: Mon, 22 Jun 2009 21:24:05 +0000
From: n3tl@xxxxxxxxx.xxx
Subject: [amsat-bb] Re: AMSAT on Twitter
To: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>, "AMSAT-BB"
<amsat-bb@xxxxx.xxx>
Message-ID:
<062220092124.207.4A3FF675000CB7ED000000CF22230647629B0A02D2089B9A019C04
040A0DBF049BCC02@xxx.xxx>
Content-Type: text/plain
Geat news, Drew. Thanks for setting this up.
Tim
-------------- Original message from "Andrew Glasbrenner"
<glasbrenner@xxxxxxxxxx.xxx>: --------------
> AMSAT now has a Twitter account, and can be found at
> http://twitter.com/AMSAT . I'll try to tweet things too small for ANS or
> email, but of interest to the general AMSAT community. To begin with they
> may be mostly about AO-51 and AO-7. All are welcome to follow us.
>
> 73, Drew KO4MA
> AMSAT VP Ops
>
> _______________________________________________
> 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: Mon, 22 Jun 2009 18:17:00 -0400
From: "Joe W2KJ" <w2kj@xxxxxxxxx.xxx>
Subject: [amsat-bb] WTB: Bird 4410-15 dlement
To: "AMSAT" <amsat-bb@xxxxx.xxx>
Message-ID: <599F08B75E924A1CB8775564A098AFD5@xxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Still looking for a Bird 4410-15 element for the Bird 4410A wattmeter.
This is a 100W element covering 1.0 to 1.8 ghz.
73, Joe W2KJ
------------------------------
Message: 5
Date: Mon, 22 Jun 2009 18:43:14 -0400
From: David - KG4ZLB <kg4zlb@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 L/U
To: n3tl@xxxxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <4A400902.1070208@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Listening on the 22:24utc pass of AO-51 just now and for the second day
running, the sudden distinct change in sound reception tells me that the
analogue signal is being switched over to digital for TLM collection
just as it gets to me in Florida.
If this is so then could we have a schedule of what passes TLM is going
to be collected please - we only get a few days to work mode L and I am
0 for 2 and I can not be bothered to waste time if the published
schedule is not going to be adhered too!
If its just not working in L/U then forget the rant!
Thanks
--
David
KG4ZLB
www.kg4zlb.com
n3tl@xxxxxxxxx.xxx wrote:
> Thanks for this Drew. I have just seen that designation on the AO-51
information page (the one linked to the status page on the AMSAT site) for the
first time, although I've made countless visits to that page over the past
year.
>
> For those who will operating Field Day from remote/portable sites and using
antennas like the Elk or Arrow, you may wish to check out this PDF, which I
found on the Cushcraft Web site:
>
> http://www.cushcraft.com/comm/support/pdf/Antenna-Polarization-14B32.pdf
>
> After reading it, I believe that AO-51 could prove to be more challenging to
work than usual this weekend, given a TX output in the SO-50 neighborhood and
the antenna mismatch many of us will be dealing with (i.e., linear polarized
antenna at the ground station vs. circularly polarized at the satellite).
>
> If I misread the document and have drawn inaccurate conclusions, I hope
someone will post a correction. However, it seems to me like this provides all
the more reason for us to focus on AO-7, FO-29 and VO-52 if we can.
>
> Thanks to all,
>
> Tim - N3TL
> -------------- Original message from "Andrew Glasbrenner"
<glasbrenner@xxxxxxxxxx.xxx>: --------------
>
>
>
> _______________________________________________
> 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
>
>
--
David
KG4ZLB
www.kg4zlb.com
------------------------------
Message: 6
Date: Mon, 22 Jun 2009 19:30:53 -0400
From: "Gould Smith" <gouldsmi@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 L/U
To: <kg4zlb@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <144745CFF1C14452A12DFEB433D08E20@xxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
David and the BB,
There is a published schedule that says that L/U is subject to interruption
for telemetry collection.
I sent out a note to the BB earlier today explaining the problem I am having
getting the satellite ready for this weekend.
The 22:30 pass only affected those in the eastern US, I don't plan on
changing L/U during the 00:00 pass that covers a larger area.
The only schedule I can give you is that I will work on the satellite until
I feel that it will give solid operation for this weekend, which I hope will
be in the next 24 hours.
73,
Gould, WA4SXM
----- Original Message -----
From: "David - KG4ZLB" <kg4zlb@xxxxxxxxxx.xxx>
To: <n3tl@xxxxxxxxx.xxx>
Cc: "Andrew Glasbrenner" <glasbrenner@xxxxxxxxxx.xxx>; "Gould Smith"
<gouldsmi@xxxxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Monday, June 22, 2009 6:43 PM
Subject: Re: [amsat-bb] Re: AO-51 L/U
> Listening on the 22:24utc pass of AO-51 just now and for the second day
> running, the sudden distinct change in sound reception tells me that the
> analogue signal is being switched over to digital for TLM collection just
> as it gets to me in Florida.
>
> If this is so then could we have a schedule of what passes TLM is going to
> be collected please - we only get a few days to work mode L and I am 0 for
> 2 and I can not be bothered to waste time if the published schedule is
> not going to be adhered too!
>
> If its just not working in L/U then forget the rant!
>
> Thanks
>
> --
> David
> KG4ZLB
> www.kg4zlb.com
>
>
>
> n3tl@xxxxxxxxx.xxx wrote:
>> Thanks for this Drew. I have just seen that designation on the AO-51
>> information page (the one linked to the status page on the AMSAT site)
>> for the first time, although I've made countless visits to that page over
>> the past year.
>>
>> For those who will operating Field Day from remote/portable sites and
>> using antennas like the Elk or Arrow, you may wish to check out this PDF,
>> which I found on the Cushcraft Web site:
>>
>> http://www.cushcraft.com/comm/support/pdf/Antenna-Polarization-14B32.pdf
>>
>> After reading it, I believe that AO-51 could prove to be more challenging
>> to work than usual this weekend, given a TX output in the SO-50
>> neighborhood and the antenna mismatch many of us will be dealing with
>> (i.e., linear polarized antenna at the ground station vs. circularly
>> polarized at the satellite).
>>
>> If I misread the document and have drawn inaccurate conclusions, I hope
>> someone will post a correction. However, it seems to me like this
>> provides all the more reason for us to focus on AO-7, FO-29 and VO-52 if
>> we can.
>>
>> Thanks to all,
>>
>> Tim - N3TL
>> -------------- Original message from "Andrew Glasbrenner"
>> <glasbrenner@xxxxxxxxxx.xxx>: --------------
>>
>>
>> _______________________________________________
>> 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
>>
>>
>
> --
> David
> KG4ZLB
> www.kg4zlb.com
>
------------------------------
Message: 7
Date: Tue, 23 Jun 2009 9:54:47 -0400
From: <n8bbq@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Phase shift keying question
To: amsat-bb@xxxxx.xxx
Message-ID: <20090623135447.7VKUQ.190981.root@xxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Andy,
Grants explanation of I/Q modulation is excellent.
Perhaps your conversation involved using complex sampling (I/Q) to double the
bandwidth compared to simple sampling. The usable bandwidth is limited to
about one half the sampling frequency (google NYQUIST). When looking at faster
convertors you reach a point where doubling the conversion rate more than
doubles the cost, or a convertor that fast may not exist. By using two
simultaneous convertors, sampling the I and Q signals, the usable bandwidth is
doubled.
If two channels are available, there is a way to double the data rate without
involving the I/Q signals. Of course I am speculating about the nature of your
conversation, so I may be way off.
Hope this helps.
'73 de Ed N8BBQ
------------------------------
_______________________________________________
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 4, Issue 291
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