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CX2SA > SATDIG 08.06.10 05:27l 941 Lines 30347 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: First QSO (Peter Portanova)
2. (no subject) (Simone T)
3. Re: CP antenna from 2 WiFi panels (i8cvs)
4. Re: CP antenna from 2 WiFi panels (i8cvs)
5. Re: CP antenna from 2 WiFi panels (John Belstner)
6. Re: (no subject) (Larry Teran)
7. Re: (no subject) (Tony Langdon)
8. Re: First QSO (Mike Ward)
9. Re: FIELD DAY SCORING/ Hamfest (Peter Portanova)
10. Re: Falcon 9 video - moving early? (Daniel Schultz)
11. Re: CP antenna from 2 WiFi panels (Gary "Joe" Mayfield)
12. Re: CP antenna from 2 WiFi panels (Greg D.)
13. Re: First QSO (Greg D.)
14. Re: CP antenna from 2 WiFi panels (John Belstner)
15. Re: First QSO (Larry Gerhardstein)
----------------------------------------------------------------------
Message: 1
Date: Mon, 07 Jun 2010 16:56:01 -0400
From: Peter Portanova <roic@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: First QSO
To: Don <don1018@xxxxxxx.xxx>
Cc: amsAT-BB@xxxxx.xxx
Message-ID: <6352FB2F853A43AE9EA61318F0E64076@xxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
Don,
Not only was it you're first contact but you also picked a satellite, SO-50
which is a challenge sometimes to operate! Ok, now you're on your way
towards VUCC!!
73's Pete
WB2OQQ
www.massapequanyweather.com
------------------------------
Message: 2
Date: Mon, 7 Jun 2010 23:42:31 +0200
From: Simone T <terrando@xxxxx.xxx>
Subject: [amsat-bb] (no subject)
To: alixdelaporte@xxxxx.xxx amandinepol@xxxxxxx.xxx
amsat-bb@xxxxx.xxxxxxxxxxxxxx@xxxxx.xxxx anabelsouto@xxxxx.xxx
anacleto_@xxxxxx.xxxxxxxxxx.xxxxxxx@xxxxx.xxx
Message-ID:
<AANLkTinrc5ZAQ5irf-2Blyw8m8o8o60C85-xrxEweBga@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
http://scipion.chez.com/default.php
------------------------------
Message: 3
Date: Tue, 8 Jun 2010 00:23:57 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
To: "John Belstner" <jbelstner@xxxxx.xxx>, "Greg D."
<ko6th_greg@xxxxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID: <000001cb0690$68838c60$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "John Belstner" <jbelstner@xxxxx.xxx>
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Monday, June 07, 2010 4:37 PM
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
>
Hi John, W9EN
I would like to know if these panels are patch style antennas linearly or
circularly polarized.
Tanks
73" de
i8CVS Domenico
------------------------------
Message: 4
Date: Tue, 8 Jun 2010 00:23:48 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
To: "John Belstner" <jbelstner@xxxxx.xxx>, "Greg D."
<ko6th_greg@xxxxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID: <002d01cb0690$25dba500$0201a8c0@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "John Belstner" <jbelstner@xxxxx.xxx>
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Monday, June 07, 2010 4:37 PM
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
>
Hi John, W9EN
I would like to know if these panels are patch style antennas linearly or
circularly polarized.
Tanks
73" de
i8CVS Domenico
------------------------------
Message: 5
Date: Mon, 7 Jun 2010 15:37:05 -0700
From: John Belstner <jbelstner@xxxxx.xxx>
Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
To: "i8cvs" <domenico.i8cvs@xxx.xx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Message-ID: <91DABEFB-108D-46C0-8089-0AF129A54564@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi Domenico,
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
They are about the same price too.
73, John
On Jun 7, 2010, at 3:23 PM, i8cvs wrote:
> ----- Original Message -----
> From: "John Belstner" <jbelstner@xxxxx.xxx>
> To: "Greg D." <ko6th_greg@xxxxxxx.xxx>
> Cc: <amsat-bb@xxxxx.xxx>
> Sent: Monday, June 07, 2010 4:37 PM
> 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
>>
>
> Hi John, W9EN
>
> I would like to know if these panels are patch style antennas linearly or
> circularly polarized.
>
> Tanks
>
> 73" de
>
> i8CVS Domenico
>
>
>
>
>
------------------------------
Message: 6
Date: Mon, 7 Jun 2010 15:08:48 -0800
From: Larry Teran <ki6yaa@xxxxx.xxx>
Subject: [amsat-bb] Re: (no subject)
To: Simone T <terrando@xxxxx.xxx>
Cc: alixdelaporte@xxxxx.xxx anacleto_@xxxxxx.xxx ana-78417@xxxxx.xxxx
amsat-bb@xxxxx.xxxx anabelsouto@xxxxx.xxx amandinepol@xxxxxxx.xxx
andrea.gangemi@xxxxx.xxx
Message-ID:
<AANLkTimnZXbjc0qVHWhhOvFnaX04Eli3q3vmnHKlo4CN@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
SPAM get out
On Mon, Jun 7, 2010 at 1:42 PM, Simone T <terrando@xxxxx.xxx> wrote:
> http://scipion.chez.com/default.php
> _______________________________________________
> 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, 08 Jun 2010 10:31:23 +1000
From: Tony Langdon <vk3jed@xxxxx.xxx>
Subject: [amsat-bb] Re: (no subject)
To: Larry Teran <ki6yaa@xxxxx.xxx>, Simone T <terrando@xxxxx.xxx>
Cc: alixdelaporte@xxxxx.xxx anacleto_@xxxxxx.xxx ana-78417@xxxxx.xxxx
amsat-bb@xxxxx.xxxx anabelsouto@xxxxx.xxx amandinepol@xxxxxxx.xxx
andrea.gangemi@xxxxx.xxx
Message-ID: <4c0d8f6b.22148f0a.3277.ffffba55@xx.xxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 09:08 AM 6/8/2010, Larry Teran wrote:
>SPAM get out
>
>On Mon, Jun 7, 2010 at 1:42 PM, Simone T <terrando@xxxxx.xxx> wrote:
<snip to avoid propagating spam URL further>
These ones are the result of the account's owner getting infected
with something, and a spam bot hijacking their account. Complaining
about the spam does nothing (never does). The most successful
approach has been to inform the affected person of the problem, and
get them to scan their PC with something like the free scanner from
www.malwarebytes.org , or another good malware scanner, then change
their webmail password.
There is a pattern to this sort of spam/infection:
1. It ALWAYS comes from a webmail capable address (I have seen
Yahoo, Gmail and Hotmail accounts infected).
2. It always features a single line with a URL, maybe with one line
of generic text "Hey, look at this" or similar.
How I discovered it was the account owner's PC being infected was
that I posted an advisory message in the group that was getting spam,
and suggesting everyone check their PC for malware. The account
owner (that the spam claimed to come from) came forward and described
what happened, and that they had fixed their system, once made aware
of the problem. Subsequent instances of this type of spam have
revealed a similar pattern. This was first sighted a few months ago.
Anyway, hope this helps people affected by this sort of problem to
find and remove the offending malware.
73 de VK3JED / VK3IRL
http://vkradio.com
------------------------------
Message: 8
Date: Mon, 7 Jun 2010 14:54:40 -0400
From: Mike Ward <kc8lpz@xxxxx.xxx>
Subject: [amsat-bb] Re: First QSO
To: amsat-bb@xxxxx.xxx
Message-ID:
<AANLkTinvQD4LWZHsv-6MDtf97V2iZ5OxUxcWfs7GxLUm@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Congrats, Don. I hope to soon be posting a message like this myself.
73, KC8LPZ
On Mon, Jun 7, 2010 at 12:21 PM, Don <don1018@xxxxxxx.xxx> wrote:
> Finally did it made first contact via satellite (SO-50_ today 6/7/10 at
> 15:18U with K8YSE . Thanks John for coming back to me.
>
> Don WB8ZOM
>
> It is quite a learning curve but if you can hang in long enough you can do
> it.
>
> The bug has now put a big bite on me
>
>
>
> Don WB8Z)M
>
>
>
> _______________________________________________
> 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: 9
Date: Mon, 07 Jun 2010 16:21:04 -0400
From: Peter Portanova <roic@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: FIELD DAY SCORING/ Hamfest
To: amsAT-BB@xxxxx.xxx
Message-ID: <C6B4A6A757A045F8B9BABB4FE44DC283@xxxx>
Content-Type: text/plain; charset="iso-8859-1"
Dee,
Yes Dee good point, now that a station can make FD points on all the
Linear Satellite's it might encourage Clubs to increase their AMSAT
visability and run a complete station. It will be another opportunity to
help DARA add more matching funds towards our goal of "Getting Back into
Space".
I had a fantastic Hamfest hosted by LIMARC, we had a very visable location,
next to the well designed Great South Bay ARC's communications trailer,
which brought more visitors to our AMSAT Booth. I want to thank K2TV,
AB2ZI, W2JGH, K2IZ, W2HCB and KA2CAQ, all graduates of my satellite classes
who helped with the non-stop visitors to our booth.
I also want to thank, Richie, K2KNB, who headed the LIMARC Hamfest and the
other volunteers for making AMSAT so welcome, you always run a big succesful
event. I will be making a satellite presentation to the club in November.
I have attached a few pictures of the day..
73's Pete
WB2OQQ
AMSAT NY Area Coordinator
www.massapequanyweather.com
------------------------------
Message: 10
Date: Mon, 07 Jun 2010 22:39:10 -0400
From: "Daniel Schultz" <n8fgv@xxx.xxx>
Subject: [amsat-bb] Re: Falcon 9 video - moving early?
To: <amsat-bb@xxxxx.xxx>
Message-ID: <620oFHcMk1056S02.1275964750@xxxxx.xxx.xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
And I heard in a presentation at the Cape some years ago that "We are so sure
the solid rockets will ignite that we send the command to blow the hold down
bolts before we send the solid rocket ignition command". Also I heard from
somebody that the fractured hold down bolts are presented to the shuttle crew
members as souvenirs after they return to Earth.
Dan Schultz N8FGV
>A few years ago at the Amsat Colloquium University of Surrey we were
privilaged
>to have astronaut Ron Parise (SK) as a guest speaker. He explained the
ignition
>suquence for the shuttle in a very entertaining way, as best I remember it
went
>like this
>As the engines?come up to thrust the explosive bolts fire and away she goes.
If
>one of the pyrotchnics?fails its no problem the bolt? just gets ripped out
of
>the concrete
>73 John G7HIA
------------------------------
Message: 11
Date: Mon, 7 Jun 2010 21:53:15 -0500
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
Cc: <amsat-bb@xxxxx.xxx>
Message-ID: <COL114-DS1112E1DFC438D6CBDF2C788AD60@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
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
------------------------------
Message: 12
Date: Mon, 7 Jun 2010 20:22:22 -0700
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
To: <jbelstner@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BLU133-W938F499851255F1506C4DA9D60@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi John,
"At best"? Interesting... I've seen many diagrams about mounting two
linear YAGIs at 90 degrees from each other on the same cross arm, with the
appropriate phasing harness. My plan is to mount the two panels the same;
one next to the other, rotated 45 degrees in opposite directions on the
cross arm, with one pushed out 1.23 inches by a block of wood. How bad will
this be? One will surely get some elliptical effects when the satellite is
off-axis, but keeping them aimed at the satellite is what the rotor and
computer are for...
I understand that I'm losing some NF by not using a proper splitter, but I
don't have one handy, and this is (was) supposed to be a low effort
adventure. Again, for AO-51 VS, I should have plenty of margin.
I've built several helixes, both 2.4 ghz for the feed to my BBQ grill, and
my current L-band uplink, and could do the same here. But, back to the low
effort part of things...
If this simply isn't going to work, then I'll just leave my current setup
alone. It consists of a 3 3/4 turn helix feeding a 30 inch BBQ grill, lined
with window screen. All combined, it's kind of heavy, and the wooden cross
arm is showing the effects of the weight and its age. It was built for
AO-40, and for the current satellites I don't really need this much gain,
hence the replacement idea.
Bad idea?
Greg KO6TH
> Subject: Re: [amsat-bb] CP antenna from 2 WiFi panels
> From: jbelstner@xxxxx.xxx
> Date: Mon, 7 Jun 2010 07:37:17 -0700
> CC: amsat-bb@xxxxx.xxx
> To: ko6th_greg@xxxxxxx.xxx
>
> 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=PID2832
6::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
>
_________________________________________________________________
The New Busy is not the too busy. Combine all your e-mail accounts with
Hotmail.
http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326
::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4
------------------------------
Message: 13
Date: Mon, 7 Jun 2010 20:39:51 -0700
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: First QSO
To: <don1018@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID: <BLU133-W17FEC21D817BF46897EE0CA9D60@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Congrats, Don!
That bug bit me about 17 years ago. It still hasn't let go.
Greg KO6TH
(RS-10, with a QSO from California to New York on 10 watts to a copper
pipe J-pole for the 2m uplink, and a wire strung out to a tree in the back
yard hooked to
a Radio Shack shortwave receiver for the 10 meter downlink)
> From: don1018@xxxxxxx.xxx
> To: amsat-bb@xxxxx.xxx
> Date: Mon, 7 Jun 2010 12:21:54 -0400
> Subject: [amsat-bb] First QSO
>
> Finally did it made first contact via satellite (SO-50_ today 6/7/10 at
> 15:18U with K8YSE . Thanks John for coming back to me.
>
> Don WB8ZOM
>
> It is quite a learning curve but if you can hang in long enough you can do
> it.
>
> The bug has now put a big bite on me
>
>
>
> Don WB8Z)M
>
>
>
> _______________________________________________
> 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
_________________________________________________________________
The New Busy is not the too busy. Combine all your e-mail accounts with
Hotmail.
http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326
::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4
------------------------------
Message: 14
Date: Tue, 8 Jun 2010 03:47:29 +0000
From: "John Belstner" <w9en@xxxx.xxx>
Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
To: "Greg D" <ko6th_greg@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<1511587891-1275968872-cardhu_decombobulator_blackberry.rim.net-898899053-@xxx
xxx.xxxx.xxxx.xx.xxxxxxxxxx>
Content-Type: text/plain; charset="Windows-1252"
Hi Greg,
What I meant by "at best" is that it will certainly be a challenge (at 2.5
GHz) to get one panel just a perfect 1/4 wavelength forward from the other.
It will be equally as challenging (at 2.5 GHz) to make 75 ohm phasing cables
some odd multiple of 1/4 wavelength.
I say that because I found it quite challenging to make phasing cables for
1.3 GHz and even 440 MHz and I had a network analyzer to help me. Just when
I thought I had it cut perfect I put the connector on and found myself 10 to
20 degrees off. That will affect the circularity of the polarization. I
finally gave up and mounted the elements of one yagi 1/4 wavelength forward
from the other and used equal length cables.
Physical spacing is easier to achieve within a few degrees at the lower
frequencies (VHF/UHF). Another alternative would have been to use a 90
degree broadband hybrid (that can handle 25 watts) but that was much more $
than I wanted to spend.
If you have a helix already, I would use that. But don't let me talk you
out of experimentation. It is possible and might be fun.
73, John
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Greg D. <ko6th_greg@xxxxxxx.xxx>
Date: Mon, 7 Jun 2010 20:22:22
To: <jbelstner@xxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Subject: RE: [amsat-bb] CP antenna from 2 WiFi panels
Hi John,
"At best"? Interesting... I've seen many diagrams about mounting two
linear YAGIs at 90 degrees from each other on the same cross arm, with the
appropriate phasing harness. My plan is to mount the two panels the same;
one next to the other, rotated 45 degrees in opposite directions on the
cross arm, with one pushed out 1.23 inches by a block of wood. How bad will
this be? One will surely get some elliptical effects when the satellite is
off-axis, but keeping them aimed at the satellite is what the rotor and
computer are for...
I understand that I'm losing some NF by not using a proper splitter, but I
don't have one handy, and this is (was) supposed to be a low effort
adventure. Again, for AO-51 VS, I should have plenty of margin.
I've built several helixes, both 2.4 ghz for the feed to my BBQ grill, and
my current L-band uplink, and could do the same here. But, back to the low
effort part of things...
If this simply isn't going to work, then I'll just leave my current setup
alone. It consists of a 3 3/4 turn helix feeding a 30 inch BBQ grill, lined
with window screen. All combined, it's kind of heavy, and the wooden cross
arm is showing the effects of the weight and its age. It was built for
AO-40, and for the current satellites I don't really need this much gain,
hence the replacement idea.
Bad idea?
Greg KO6TH
> Subject: Re: [amsat-bb] CP antenna from 2 WiFi panels
> From: jbelstner@xxxxx.xxx
> Date: Mon, 7 Jun 2010 07:37:17 -0700
> CC: amsat-bb@xxxxx.xxx
> To: ko6th_greg@xxxxxxx.xxx
>
> 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=PID2832
6::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
>
_________________________________________________________________
The New Busy is not the too busy. Combine all your e-mail accounts with
Hotmail.
http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326
::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4
------------------------------
Message: 15
Date: Mon, 07 Jun 2010 22:13:41 -0600
From: Larry Gerhardstein <gerhardstein@xxxxxxx.xxx>
Subject: [amsat-bb] Re: First QSO
To: amsat-bb@xxxxx.xxx
Message-ID: <4C0DC375.4080404@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
WB8ZOM Don, Congrats to you!! I'll always recall my first satellite
QSO. It was with KA4KYI 2+ years ago. I was using my HF/VHF/UHF mobile
station for those early contacts. It grows on you; I now have automated
xcvr and rotor steering on 2M and 70CM and am getting ready to erect
antennas for 1.2G and 2.4G. Hope to work you soon.
73, Larry W7IN, DN27 Montana
------------------------------
_______________________________________________
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 257
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