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CX2SA > SATDIG 05.03.13 21:03l 355 Lines 10987 Bytes #999 (0) @ WW
BID : AMSATBB874
Read: GUEST
Subj: AMSAT-BB-digest V8 74
Path: IZ3LSV<IW0QNL<ON4HU<F3KT<CX2SA
Sent: 130305/2003Z @:CX2SA.SAL.URY.SA #:4027 [Salto] FBB7.00e $:AMSATBB874
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Arrow antenna for sale (John Price)
2. Re: STRaND1 polarity shift observation (i8cvs)
3. Arrow antenna sold (John Price)
4. Re: STRaND1 polarity shift observation (Graham Shirville)
5. We-Wish decay (Nico Janssen)
----------------------------------------------------------------------
Message: 1
Date: Mon, 4 Mar 2013 16:04:16 -0500
From: John Price <n4qwf1@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Arrow antenna for sale
Message-ID:
<CA+Fxo6T-FO5j=ojDUqDd5VFYj8K7s3Z8DHbLKzoh7pm89ti=eA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I have a arrow antenna in excellent condition for sale. It has the duplexer
built into the foam handle. It also has the very nice blue roll up storage
bag with it. This is an estate item and it appears to have been used very
little if ever. Anyone interested before it goes to eBay please email me
off list.
73's << John
--
N4QWF Amateur Radio Operator
Email N4QWF@xxxxx.xxx
Formerly KC4AHW VK3FEZ
DXCC #33,478
VUCC SAT #135
WAS SAT #296
51 on AO-51 #13
LON -79.256 LAT 37.459 Grid FM07il
>From the Foothills of the Blueridge
*Life should not be a journey to the grave with the intention of arriving
safely in a pretty and well preserved body, but rather to skid in
broadside, thoroughly used up, totally worn out, and loudly proclaiming -
"WOW, What a ride!"
------------------------------
Message: 2
Date: Tue, 5 Mar 2013 01:02:41 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Ken Swaggart" <k.swaggart@xxxxxxx.xxx>, "Amsat - BBs"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: STRaND1 polarity shift observation
Message-ID: <000001ce1935$0ac3faa0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Ken,W7KKE
If STRaND1 has a circularly polarized crossed dipole antenna like that
depicted in Fig 12 of the article "The Advantages of Circular Polarization
for Amateur Satellite Ground Station " by K4KJ already in your hands
than it is easy to understand why STRaND1 was stronger when you
selected LHCP while approaching TCA and why after TCA, RHCP
was stronger while the satellite was receding.
Fig-12 shows that if two crossed dipoles are mounted over the same
plane and are supplied with 90 degrees out of phase than the polarizazion
is RHCP in one axial direction and LHCP in the opposite axial direction
and this can explain why the signal was stronger when you selected
LHCP while approaching TCA and why after TCA, RHCP was stronger
while the satellite was receding.
BTW unfortunately actually there are not official informations from
AMSAT-UK about the polarization of the STRaND1 70 cm antenna
and without this information it's very difficult to answere your question.
73" de
i8CVS Domenico
----- Original Message -----
From: "Ken Swaggart" <k.swaggart@xxxxxxx.xxx>
To: "i8cvs" <domenico.i8cvs@xxx.xx>; "Amsat - BBs" <amsat-bb@xxxxx.xxx>
Sent: Monday, March 04, 2013 5:02 PM
Subject: Re: [amsat-bb] STRaND1 polarity shift observation
> Domenico,
>
> Thanks for sending the K4KJ article.
>
> However my question was why does STRaND1, which only has a whip antenna,
> sometimes appear to exhibit circular polarity characteristics? I would
> expect a whip antenna transmitting from space to have the same signal
> strength on the ground using either RH or LH polarity on my receiving
> antenna.
>
> 73,
> Ken, W7KKE
>
> -----Original Message-----
> From: i8cvs
> Sent: Monday, March 04, 2013 00:42
> To: Ken Swaggart ; Amsat - BBs
> Subject: Re: [amsat-bb] STRaND1 polarity shift observation
>
> Hi Ken, W7KKE
>
> The answere to your question is clearly described into the zipped article
> "Circular Polarization" by K4KJ, 5 MB long that I have sent to you in
> a separate email.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Ken Swaggart" <k.swaggart@xxxxxxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Monday, March 04, 2013 5:10 AM
> Subject: [amsat-bb] STRaND1 polarity shift observation
>
>
> > During my last pass at 0332Z, max elevation 45 degrees out over the
> Pacific,
> > I noticed that STRaND1 was stronger when I selected LHCP while
approaching
> > TCA. After TCA, RHCP was stronger while it was receding. I believe
this
> > cubesat uses a whip, so not sure what is causing this.
> >
> > Anyone have an idea why?
> >
> > Tnx,
> > Ken, W7KKE
> > CN75xa
> >
> >
> > _______________________________________________
> > 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: Mon, 4 Mar 2013 22:01:55 -0500
From: John Price <n4qwf1@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Arrow antenna sold
Message-ID:
<CA+Fxo6Q8YR6A7Z-ANuex4FbZ2fz70Kou+aHUxdsdrpp3Dhcr_Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Thanks for all the emails and interest. I had no idea they were that
popular.
73's << John
--
N4QWF Amateur Radio Operator
Email N4QWF@xxxxx.xxx
Formerly KC4AHW VK3FEZ
DXCC #33,478
VUCC SAT #135
WAS SAT #296
51 on AO-51 #13
LON -79.256 LAT 37.459 Grid FM07il
>From the Foothills of the Blueridge
*Life should not be a journey to the grave with the intention of arriving
safely in a pretty and well preserved body, but rather to skid in
broadside, thoroughly used up, totally worn out, and loudly proclaiming -
"WOW, What a ride!"
------------------------------
Message: 4
Date: Tue, 5 Mar 2013 08:58:41 -0000
From: "Graham Shirville" <g.shirville@xxxxxxxxxx.xxx>
To: "i8cvs" <domenico.i8cvs@xxx.xx>, "Ken Swaggart"
<k.swaggart@xxxxxxx.xxx>, "Amsat - BBs" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: STRaND1 polarity shift observation
Message-ID: <7E424112D4384D68A3D9843CE51A237A@xxxxxxx.xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Dom,
Well this is not "official" but I can advise that the antennas on Strand-1
are both single 1/4 wave monopoles. They project from near the corners of
the structure as indicated here
http://www.google.co.uk/imgres?q=strand-1&hl=en&biw=804&bih=559&tbm=isch&tbnid
=54d2HB8b425s7M:&imgrefurl=http://eandt.theiet.org/magazine/2012/03/satellite-
expertise-above.cfm&docid=p-bcchRIAKhudM&imgurl=http://eandt.theiet.org/magazi
ne/2012/03/images/640_strand-1.jpg&w=640&h=426&ei=6rI1UezVLoW0PNzugIgB&zoom=1&
ved=1t:3588,r:0,s:0,i:80&iact=rc&dur=3695&sig=109122702080401960358&page=1&tbn
h=166&tbnw=243&start=0&ndsp=10&tx=134&ty=96
sorry for the long link!
I do not know whether the satellite attitude has yet been stabilised nor
whether the solar panels have been deployed but there is not much sign of
rapid signal strength changes during a pass.
cheers
Graham
-----Original Message-----
From: i8cvs
Sent: Tuesday, March 05, 2013 12:02 AM
To: Ken Swaggart ; Amsat - BBs
Subject: [amsat-bb] Re: STRaND1 polarity shift observation
Hi Ken,W7KKE
If STRaND1 has a circularly polarized crossed dipole antenna like that
depicted in Fig 12 of the article "The Advantages of Circular Polarization
for Amateur Satellite Ground Station " by K4KJ already in your hands
than it is easy to understand why STRaND1 was stronger when you
selected LHCP while approaching TCA and why after TCA, RHCP
was stronger while the satellite was receding.
Fig-12 shows that if two crossed dipoles are mounted over the same
plane and are supplied with 90 degrees out of phase than the polarizazion
is RHCP in one axial direction and LHCP in the opposite axial direction
and this can explain why the signal was stronger when you selected
LHCP while approaching TCA and why after TCA, RHCP was stronger
while the satellite was receding.
BTW unfortunately actually there are not official informations from
AMSAT-UK about the polarization of the STRaND1 70 cm antenna
and without this information it's very difficult to answere your question.
73" de
i8CVS Domenico
----- Original Message -----
From: "Ken Swaggart" <k.swaggart@xxxxxxx.xxx>
To: "i8cvs" <domenico.i8cvs@xxx.xx>; "Amsat - BBs" <amsat-bb@xxxxx.xxx>
Sent: Monday, March 04, 2013 5:02 PM
Subject: Re: [amsat-bb] STRaND1 polarity shift observation
> Domenico,
>
> Thanks for sending the K4KJ article.
>
> However my question was why does STRaND1, which only has a whip antenna,
> sometimes appear to exhibit circular polarity characteristics? I would
> expect a whip antenna transmitting from space to have the same signal
> strength on the ground using either RH or LH polarity on my receiving
> antenna.
>
> 73,
> Ken, W7KKE
>
> -----Original Message-----
> From: i8cvs
> Sent: Monday, March 04, 2013 00:42
> To: Ken Swaggart ; Amsat - BBs
> Subject: Re: [amsat-bb] STRaND1 polarity shift observation
>
> Hi Ken, W7KKE
>
> The answere to your question is clearly described into the zipped article
> "Circular Polarization" by K4KJ, 5 MB long that I have sent to you in
> a separate email.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Ken Swaggart" <k.swaggart@xxxxxxx.xxx>
> To: <amsat-bb@xxxxx.xxx>
> Sent: Monday, March 04, 2013 5:10 AM
> Subject: [amsat-bb] STRaND1 polarity shift observation
>
>
> > During my last pass at 0332Z, max elevation 45 degrees out over the
> Pacific,
> > I noticed that STRaND1 was stronger when I selected LHCP while
approaching
> > TCA. After TCA, RHCP was stronger while it was receding. I believe
this
> > cubesat uses a whip, so not sure what is causing this.
> >
> > Anyone have an idea why?
> >
> > Tnx,
> > Ken, W7KKE
> > CN75xa
> >
> >
> > _______________________________________________
> > 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: 5
Date: Tue, 05 Mar 2013 20:58:42 +0100
From: Nico Janssen <hamsat@xxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] We-Wish decay
Message-ID: <51364E72.20308@xxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
All,
Cubesat We-Wish (38856, 1998-067CS) will soon burn up in the atmosphere.
Probably the decay will occur on March 13. Of course this depends on how
solar activity develops.
73,
Nico PA0DLO
------------------------------
_______________________________________________
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 8, Issue 74
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