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CX2SA > SATDIG 01.03.14 21:02l 445 Lines 13375 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. Re: Inverted-V turnstile idea (Matthias Bopp)
2. circular polarization of antennas not on same axis
(Douglas Phelps)
3. Re: Inverted-V turnstile idea (Jonny 290)
4. LituanicaSAT-1 tracking. (Todd Bloomingdale)
5. ITF-1 information right after deployment requested.
(Toshihiro KAMEDA)
6. Re: LituanicaSAT-1 tracking. (Todd Bloomingdale)
7. ARTSAT1:INVADER Information (ji1izr/Masahiro Sanada)
8. Reminder: UK CubeSat Workshop May 13 (M5AKA)
9. Re: circular polarization of antennas not on same axis
(Gary "Joe" Mayfield)
10. Kenwood VC-H1 Cables (Clint Bradford)
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Message: 1
Date: Fri, 28 Feb 2014 21:51:33 +0100
From: "Matthias Bopp" <matthias.bopp@xxx.xx>
To: "'Jonny 290'" <jonny290@xxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Inverted-V turnstile idea
Message-ID: <018a01cf34c6$dd767290$986357b0$@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Matt,
are you referring to a turnstile antenna like the one available from WIMO
here in Germany ?
Please see the following link: http://www.wimo.de/download/ta1.pdf
Best regards
Matthias
www.dd1us.de
-----Urspr?ngliche Nachricht-----
Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
Auftrag von Jonny 290
Gesendet: Freitag, 28. Februar 2014 20:50
An: amsat-bb@xxxxx.xxx
Betreff: [amsat-bb] Inverted-V turnstile idea
I had an idea pop in my head for a simple turnstile antenna, and am not
finding much info on what I want to do via Google searches I wanted to
bounce this off the list and see what people think.
My idea consists of three main points:
-Antenna elements being conventional (non-folded) inverted V dipoles, tuning
the length for resonance and angle to set at 50 ohms each
-1/4 wave 50 ohm phasing line between the sets of dipoles -Feed via DK7ZB
match using a 1/4 wave paralleled 2x75 ohm line section (37 ohms),
transforming the 25 ohms back up to right around 50 ohms for final feed
This approach would give the following advantages:
-Lower SWR than standard 75-ohm parallel turnstiles -Dipoles could be
individually tuned via direct 50 ohm feed during construction -DK7ZB match
is constructed out of inexpensive 75-ohm coax -Phasing line length would
only affect phase, instead of phase and impedance.
My main question, though is: With dipole elements canted down roughly 35
degrees from vertical (what I'm ballparking to get them down to 50 ohms), am
I going to see noticeably degraded performance, especially regarding the
polarization?
Thanks for any tips or discussion!
--Matt
KC4YLV
_______________________________________________
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: 2
Date: Fri, 28 Feb 2014 13:13:46 -0800 (PST)
From: Douglas Phelps <dphelps1@xxxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] circular polarization of antennas not on same axis
Message-ID: <1393622026.611.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
I have 2 of the ELK antennas which I mount at 90 degree angle to each other
and switch between as the satellite rotates. ?My question is:
Could I feed the two ELK antennas which are 4 feet apart, on the same boom
and at right angles to each other, in quadrature phase and achieve circular
polarization or perhaps decent elliptical polarization?
Thanks,
Doug K9DLP
------------------------------
Message: 3
Date: Fri, 28 Feb 2014 15:45:35 -0600
From: Jonny 290 <jonny290@xxxxx.xxx>
To: Matthias Bopp <matthias.bopp@xxx.xx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Inverted-V turnstile idea
Message-ID:
<CALVMnS_Jb0DUgsWp+GonvExWWh7gsLjHzVT8t4UfFbe0CQ-i-w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Yes, that's exactly what I had in mind! So it very well may be a viable
design, then.
--
Matt
-jonny 290
On Fri, Feb 28, 2014 at 2:51 PM, Matthias Bopp <matthias.bopp@xxx.xx> wrote:
> Hi Matt,
>
> are you referring to a turnstile antenna like the one available from WIMO
> here in Germany ?
>
> Please see the following link: http://www.wimo.de/download/ta1.pdf
>
> Best regards
>
> Matthias
>
> www.dd1us.de
>
>
> -----Urspr?ngliche Nachricht-----
> Von: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Im
> Auftrag von Jonny 290
> Gesendet: Freitag, 28. Februar 2014 20:50
> An: amsat-bb@xxxxx.xxx
> Betreff: [amsat-bb] Inverted-V turnstile idea
>
> I had an idea pop in my head for a simple turnstile antenna, and am not
> finding much info on what I want to do via Google searches I wanted to
> bounce this off the list and see what people think.
>
> My idea consists of three main points:
>
> -Antenna elements being conventional (non-folded) inverted V dipoles,
> tuning
> the length for resonance and angle to set at 50 ohms each
> -1/4 wave 50 ohm phasing line between the sets of dipoles -Feed via DK7ZB
> match using a 1/4 wave paralleled 2x75 ohm line section (37 ohms),
> transforming the 25 ohms back up to right around 50 ohms for final feed
>
> This approach would give the following advantages:
>
> -Lower SWR than standard 75-ohm parallel turnstiles -Dipoles could be
> individually tuned via direct 50 ohm feed during construction -DK7ZB match
> is constructed out of inexpensive 75-ohm coax -Phasing line length would
> only affect phase, instead of phase and impedance.
>
> My main question, though is: With dipole elements canted down roughly 35
> degrees from vertical (what I'm ballparking to get them down to 50 ohms),
> am
> I going to see noticeably degraded performance, especially regarding the
> polarization?
>
> Thanks for any tips or discussion!
>
> --Matt
> KC4YLV
> _______________________________________________
> 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: Fri, 28 Feb 2014 18:42:22 -0600
From: Todd Bloomingdale <tbloomingdale@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] LituanicaSAT-1 tracking.
Message-ID:
<CAHrZnnNT+j0TVWafaMAY7vkcz0U0adWFS04hqjD8y-wFXdahLw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
I've been looking for information on tracking information for the
LituanicaSAT-1. Do I use the ISS data for this?
Todd Bloomingdal
e-KC9LOX
Tom
a
h, WI
------------------------------
Message: 5
Date: Sat, 01 Mar 2014 10:01:44 +0900
From: Toshihiro KAMEDA <jj3grx@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ITF-1 information right after deployment
requested.
Message-ID: <53113178.30705@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-2022-JP
Dear Friends,
This is JJ3GRX Toshi, project member of the satellite ITF-1 "YUI"
launched on Feb.27 (UTC).
As you may know, we have not succeeded to receive any signal from the
satellite.
We are gathering the information especially before 1st reach to Japan.
If you watched 437.525MHz between Feb.27 19:13 - 20:15 (UTC), please
give us the info.
"Watched the freq. but no signal" is now very precious information for us.
If it is the case for many stations, we must consider the power supply
problem.
Providing the information is greatly appreciated.
Best regards,
Toshihiro KAMEDA, JJ3GRX
jj3grx@xxxxx.xxx
------------------------------
Message: 6
Date: Fri, 28 Feb 2014 20:35:34 -0600
From: Todd Bloomingdale <tbloomingdale@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: LituanicaSAT-1 tracking.
Message-ID:
<CAHrZnnPH-Nagk7nkabJ13Ye2wJq7xywpYFyxyE7OZvmU+wwqTQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Thanks for the reply all.
Todd Bloomingdale
Tomah, WI
On Fri, Feb 28, 2014 at 6:42 PM, Todd Bloomingdale
<tbloomingdale@xxxxx.xxx>wrote:
> I've been looking for information on tracking information for the
> LituanicaSAT-1. Do I use the ISS data for this?
>
>
> Todd Bloomingdal
> e-KC9LOX
>
> Tom
> a
> h, WI
>
------------------------------
Message: 7
Date: Sat, 1 Mar 2014 17:32:16 +0900 (JST)
From: ji1izr/Masahiro Sanada <ji1izr_1975@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] ARTSAT1:INVADER Information
Message-ID: <312739.3687991393662736982.ji1izr_1975@xxxxx.xxx>
Content-Type: text/plain; charset="iso-2022-jp"
Hello, de ji1izr.
I am happy to hear that many reports have been sent about CubeSat.
Here, I will inform you about ARTSAT1:INVADER on CW telemetory.
1 The 'AS0' before Callsign of the satellite is not sent.
2 The length of AS5 is 15 characters not 11 characters.
The revised information will be provided by Tamabi Univ. Operation on the web.
**********************************
Masahiro Sanada
de ji1izr
Hiratsuka-city
Kanagawa,Japan
ji1izr_1975@xxxxx.xxx
ji1izr@xxxx.xxx
ji1izr@xxxxxx.xx.xx
web: http://ji1izr.atnifty.com/
blog: http://ji1izr.air-nifty.com/
**********************************
------------------------------
Message: 8
Date: Sat, 1 Mar 2014 11:50:09 +0000 (GMT)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Reminder: UK CubeSat Workshop May 13
Message-ID:
<1393674609.6632.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
The UK CubeSat Workshop, takes place Tuesday, May 13, 2014 at Harwell.?It
will include presentations on the amateur radio satellites FUNcube-1 and
UKube-1 and the Planet Labs Flock1 CubeSats, see
?
http://amsat-uk.org/2014/02/28/free-uk-cubesat-workshop/
?
Also on the AMSAT-UK website:
?
Satellite TLE Lottery Begins
http://amsat-uk.org/2014/03/01/satellite-tle-lottery-begins/
?
Dr Lucy Rogers M6CME to give Keynote Presentation at IWD STEM Conference
http://amsat-uk.org/2014/02/28/m6cme-to-give-keynote-presentation-at-iwd-stem-
conference/
?
----
73 Trevor M5AKA
AMSAT-UK
Website http://amsat-uk.org/
Facebook https://www.facebook.com/pages/AMSAT-UK/208113275898396
Twitter https://twitter.com/AMSAT_UK
----
------------------------------
Message: 9
Date: Sat, 1 Mar 2014 07:58:01 -0600
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
To: "'Douglas Phelps'" <dphelps1@xxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: circular polarization of antennas not on same
axis
Message-ID: <BAY173-DS783E1F9598E90D3D4F9F38A8D0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Yes, it can be done. The "Satellite Experimenters Handbook" describes it.
I have done it with Arrow antennas.
Here are a couple pictures from our 2005 setup:
http://www.w0wtn.org/img_browse.php?i=/images/field_day_2005/p0000016.jpg
http://www.w0wtn.org/img_browse.php?i=/images/field_day_2005/KK0SD_Sat_Ant.j
pg
http://www.w0wtn.org/img_browse.php?i=/images/field_day_2005/p0000017.jpg
It worked very well.
73,
Joe kk0sd
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Douglas Phelps
Sent: Friday, February 28, 2014 3:14 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] circular polarization of antennas not on same axis
I have 2 of the ELK antennas which I mount at 90 degree angle to each other
and switch between as the satellite rotates. ?My question is:
Could I feed the two ELK antennas which are 4 feet apart, on the same boom
and at right angles to each other, in quadrature phase and achieve circular
polarization or perhaps decent elliptical polarization?
Thanks,
Doug K9DLP
_______________________________________________
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: 10
Date: Sat, 01 Mar 2014 10:02:41 -0800
From: Clint Bradford <clintbradford@xxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Kenwood VC-H1 Cables
Message-ID: <F2A33837-41EB-4E43-9EE8-11F468485754@xxx.xxx>
Content-Type: text/plain; charset=us-ascii
BLATANT COMMERCIAL MESSAGE ALERT - but these are fairly rare and are
of interest to satellite devotees ....
I just found PG-4V and PG-4T cables in the garage. Both brand new, OLD stock.
Stillin original Kenwood packaging.
If you have a Kenwood VC-H1, you know what these are. They are of no use to
anyone else.
The PG-4T connects the VC-H1 to TM-V7A, TM-G707 or TM-733.
The PG-4V connects the VC-H1 to TH-D7A.
If any AMSAT-er needs these, I will donate 20% of the sale to the AMSAT
chapter of your choice. They are $45 each - shipping to US48 via USPS Priority
Mail included.
Clint K6LCS
909-241-7666 - cell
------------------------------
_______________________________________________
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 9, Issue 75
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