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CX2SA > SATDIG 08.06.10 20:09l 514 Lines 13973 Bytes #999 (0) @ WW
BID : AMSATBB5258
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Subj: AMSAT-BB-digest V5 258
Path: IZ3LSV<IW0QNL<F6IQF<IK6ZDE<XE1FH<CX2SA
Sent: 100608/1903Z @:CX2SA.LAV.URY.SA #:64972 [Minas] FBB7.00e $:AMSATBB5258
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. W3XO's book (na2x@xxxxx.xxxx
2. Re: W3XO's book (Peter Portanova)
3. Re: CP antenna from 2 WiFi panels (i8cvs)
4. RAX - Radio Aurora Explorer (Trevor .)
5. DN43 (kladuke1144@xxx.xxxx
6. FW: RAX - Radio Aurora Explorer
(John K Scoggin Jr (W3JKS/AAT3BF))
7. UEK-3000 (Doug Dietz)
8. Tracking Falcon 9's Dragon Payload In Real Time (B J)
9. W2UHI SK (Ronald Long)
----------------------------------------------------------------------
Message: 1
Date: Tue, 8 Jun 2010 04:16:01 -0700 (PDT)
From: <na2x@xxxxx.xxx>
Subject: [amsat-bb] W3XO's book
To: amsat-bb@xxxxx.xxx
Cc: na2x@xxxxx.xxx
Message-ID: <582457.21368.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
I just received the recently released W3XO book ""AMSAT The First Forty
Years" (available from the AMSAT store).
Man, what a great book!? As some one who has been involved with AMSAT from
the early 1970's, Bill's description of the AMSAT activities through all
these years was a true pleasure to read about.? I'm sure even relative
new-comers would enjoy reading it too.
Thanks go out, of course, to Bill, W3XO for putting together this fine book,
and all the contributions made to it by others, and especially to AMSAT for
making it
available to all of us.
Bob NA2X
AMSAT LM # 51
------------------------------
Message: 2
Date: Tue, 08 Jun 2010 07:29:08 -0400
From: Peter Portanova <roic@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: W3XO's book
To: amsAT-BB@xxxxx.xxx
Message-ID: <6A9DD7E8396F410B980EC861AAA75B6D@xxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
Bob,
I appreciate your posting about W3XO's, book "AMSAT the First Forty Years",
it sounds like a must read and reference to appreciate the contributions of
Amateur's around the world. The more we understand the easier it will be to
pass on our knowledge to others in this field, thank you.
73's Pete
WB2OQQ
www.massapequanyweather.com
------------------------------
Message: 3
Date: Tue, 8 Jun 2010 13:56:23 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>, "Greg D."
<ko6th_greg@xxxxxxx.xxx>, "Gary \"Joe\" Mayfield"
<gary_mayfield@xxxxxxx.xxx>, "John Belstner" <jbelstner@xxxxx.xxx>
Message-ID: <000d01cb0701$9e826ae0$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Joe, KK0SD
Or you can place the patches side by side and crossed by 90 degrees with
one of them advanced 1/4 wavelengt (1.23") free space in the axial direction
and feed them with equal feed line lenght.
It is easer because these panels are patch style antennas already supplyed
with the same lenght of coax cable and a connector but in any case you need
a power splitter with characteristic impedance of 35 ohm to transform the
25 ohm of the paralleled antennas to the 50 ohm of the main feed line or
a load as a preamplifier.
The problem here is that since they are pach style antennas you cannot
establish immediately if crossing one patch vertically polarized and the
other one orizontally polarized the generated CP is RHCP or LHCP and
you need to make a measurement of circularity sense of radiation with
respect to a reference CP antenna as for example an helix antenna.
Just in case you want RHCP and instead you get LHCP it is sufficient to
rotate one patch by 180 degrees and the sense of the current flowing in the
side of the patch where the coax is connected will flow in the opposite
direction reversing LHCP to RHCP and vice versa.
The best solution instead to use two HG2414P linear paches is to buy
only one circularly polarized patch model HG2409PCR if you need to
radiate RHCP or a model HG09PCL if you need to radiate LHCP
To illuminate a dish and radiate or receive RHCP from reflection on it's
surface for use on satellites hopefully P3E in the future ? it is necessary
the patch model HG09PCL wich radiates LHCP toward the dish.
By the way a patch antenna has a lobe of radiation of about 150 degrees
wide at the -10 dB points and as a feed it is suitable for dishes having a
very low F/D ratio under 0.45 to prevent spillover.
Tanks to John ,W9EN to provide me with the internet address in order
to find the technical data of the above WiFi panels.
The HG2414P is a linearly polarized patch.
http://www.34t.com/PDF/hg2414p.pdf
The HG2409PC is a circular polarized patch (LH or RH available).
http://www.34t.com/PDF/hg2409pc.pdf
73" de
i8CVS Domenico
----- Original Message -----
From: "Gary "Joe" Mayfield" <gary_mayfield@xxxxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, June 08, 2010 4:53 AM
Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
> You can place them side by side and introduce the delay in the feed line
of
> one as well.
>
> 73,
> Joe kk0sd
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of John Belstner
> Sent: Monday, June 07, 2010 9:37 AM
> To: Greg D.
> Cc: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
>
> Hi Greg,
>
> These panels are patch style antennas and as such you will not be able to
> place one behind the other to obtain circular polarization. Placing one
> next to the other will at best produce an elliptically polarized pattern,
> and you should use a 50 ohm splitter to keep your impedance 50 ohms. The
> shape of the patch and position of the feed point is typically how you
> obtain circular polarization with a patch antenna.
>
> Or, you can obtain RHCP with the same or more gain and less trouble by
> making a Helix. A sheet of aluminum, #8 copper wire and and a piece of
PVC
> of the right diameter is all you need.
> http://brneurosci.org/helix-antenna.html
>
> Or, you can try just a single panel and see how it performs for a while.
>
> Good luck!
>
> 73, John W9EN
> DM13le
> W9EN@xxxxx.xxx
>
>
>
>
>
>
>
>
> On Jun 6, 2010, at 1:15 PM, Greg D. wrote:
>
> >
> > Hi folks,
> >
> > Before I start nailing stuff together, I just want to verify what I'm
> doing...
> >
> > I want to make a 2.4ghz Right-Hand Circular antenna from two flat panel
> Wi-Fi antennas. The idea is to mount them at 90 degrees from each other,
> with one 1/4 wavelength in front of the other. Combine the two feeds with
a
> simple Tee (the feeds are of equal length), and into the pre-amp. Since
I'm
> not transmitting, I'm not too worried about the resulting 25 ohm impedance
> (or should I be?).
> >
> > If it matters, the panels are from HyperLink Technologies, their model
> HG2414P, with a claimed 14dBi gain.
> >
> > So, the questions:
> >
> > 1. 1/4 wavelength at 2401 mhz is ((3 x 10**8 / 2401 x 10**6) / 4)
meters,
> or about 1.23 inches. Right?
> >
> > 2. Most of our 2.4 ghz satellite downlinks seem to be either linear or
> RHCP, so I'm guessing that RHCP is probably the preferred construction.
> (Yes?)
> >
> > 3. Looking at the Satellite Experimenter's Handbook (figure 7-10), I
> believe the panel rotated 90 degrees counter-clockwise as seen from behind
> the panels should be the one farther out in front, for RHCP. (Their
picture
> shows clockwise for LHCP.) Is this correct?
> >
> > Thanks,
> >
> > Greg KO6TH
> >
> > _________________________________________________________________
> > The New Busy think 9 to 5 is a cute idea. Combine multiple calendars
with
> Hotmail.
> >
>
http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28
> 326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5
> > _______________________________________________
> > 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: 4
Date: Tue, 8 Jun 2010 13:05:08 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] RAX - Radio Aurora Explorer
To: amsat-bb@xxxxx.xxx
Message-ID: <942854.3035.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
I believe the Radio Aurora Explorer (RAX) 3U cubesat (437.505MHz and S-band)
was originally slated for a May 28 launch from Kodiak, Alaska.
Was the launch delayed ?
73 Trevor M5AKA
------------------------------
Message: 5
Date: Tue, 8 Jun 2010 08:05:26 -0600
From: <kladuke1144@xxx.xxx>
Subject: [amsat-bb] DN43
To: <amsat-bb@xxxxx.xxx>
Message-ID: <COL117-DS7C255A06BE9325726805EBCD60@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
All,
I will be operating portable today (June 8 and 9) and tomorrow morning
from DN43 in Driggs, ID. I plan to operate the FM birds AO51, SO50, HO68
and AO27.
73
WC7V
Kerry
------------------------------
Message: 6
Date: Tue, 8 Jun 2010 10:53:19 -0400
From: "John K Scoggin Jr \(W3JKS/AAT3BF\)" <aat3bf@xxxxxxxx.xxx>
Subject: [amsat-bb] FW: RAX - Radio Aurora Explorer
To: <amsat-bb@xxxxx.xxx>
Message-ID: <E72FD383F74A479793B03609F2E94897@xx.xxxxx>
Content-Type: text/plain; charset="us-ascii"
There was a news item a week or two ago that the Kodiak Launch Complex had
lost its funding from the Missile Defense Agency and that the
Congresscritters were looking for some grease in the bottom of the pork
barrel to keep it alive.
It looks like the MDA launches are going to be coming mostly from Kwajalein
now (which probably makes more sense from the standpoint of fixed support
costs, as the RADARs on Kwaj as still very much needed in any case.
Did RAX lose its ride perhaps? There have been no updates on the RAX
website for a couple of months.
73,
john
_____________________________________
John K Scoggin, Jr. W3JKS/AAT3BF/AAM3EDE/AAA9SL
US Army Military Auxiliary Radio System
Delaware Gateway Station AAB3DE
Special Consultant - Technology
Emergency Operations Officer - Delaware
"Old RADEF Officers never die, they simply decay exponentially."
Chief Engineer
Mobile Communications Unit 37 (AAT3CAD/W3MCU)
http://www.armymars.net/ArmyMARS/MCU
ARRL Assistant Section Manager - Delaware
Email: aat3bf@xxxxxxxx.xxx
Telephone: (302) 451-5000
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Trevor .
Sent: Tuesday, June 08, 2010 9:05 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] RAX - Radio Aurora Explorer
I believe the Radio Aurora Explorer (RAX) 3U cubesat (437.505MHz and S-band)
was originally slated for a May 28 launch from Kodiak, Alaska.
Was the launch delayed ?
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
------------------------------
Message: 7
Date: Tue, 8 Jun 2010 11:31:33 -0400
From: Doug Dietz <dcdietz@xxxxxxxxx.xxx>
Subject: [amsat-bb] UEK-3000
To: amsat-bb@xxxxx.xxx
Message-ID: <B4EBF9EA-79D7-4922-9E00-834709B0B059@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I am listing here before I I list on ebay I have a used uek-3000 that was
purchased for ao-40 I have since moved and no longer can have antennas. I
would like 400.00 plus shipping thanks for letting me post Doug
dcdietz@xxxxxxxxx.xxx
------------------------------
Message: 8
Date: Tue, 8 Jun 2010 11:10:00 -0700 (PDT)
From: B J <top_gun_canada@xxxxx.xxx>
Subject: [amsat-bb] Tracking Falcon 9's Dragon Payload In Real Time
To: amsat-bb@xxxxx.xxx
Message-ID: <148391.31372.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
http://www.n2yo.com/?s=36595
73s
Bernhard VA6BMJ @ DO33FL
------------------------------
Message: 9
Date: Tue, 08 Jun 2010 14:37:45 -0400
From: Ronald Long <rlong3@xxxxxxxx.xx.xxx>
Subject: [amsat-bb] W2UHI SK
To: amsat-bb@xxxxx.xxx
Message-ID: <A1.7F.29481.5CD8E0C4@xxxxxxxxxxxxx.xxxx.xx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
I am forwarding this note which was published on the moon-net list.
ron w8gus
===
It is with great sadness that I report the passing of Frank Lumney,
W2UHI. He passed away in the early hours of June 3, 2010. There will
not be any wake or any services that I am aware of. He will be
interred in the Buffalo, NY area. Frank was a great friend and a true
asset to the amateur radio community and in particular EME. Frank
would have turned 88 on July 4.
Rest in Peace Old Friend!
de Joe K1RQG
====
Many old time AMSAT operators (AO-13 for example) will remember
Frank. Many years ago, he was also a frequent check-in to the
AMSAT-NA 75 meter net. He was a very accomplished amateur and will be
missed. You can also still find a number of very interesting web
pages using Google and 'w2uhi' or 'w2uhi amsat'. A couple of
interesting pages are:
http://pages.pathwaynet.com/~fblumn/index.html
and
http://www.k5so.com/Using_sun_noise.html
=====
------------------------------
_______________________________________________
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 5, Issue 258
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