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CX2SA > SATDIG 17.04.13 21:03l 412 Lines 13789 Bytes #999 (0) @ WW
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Sent: 130417/1902Z @:CX2SA.SAL.URY.SA #:5328 [Salto] FBB7.00e $:AMSATBB8120
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Mount an Arrow on rotator with 2m vertical orhorizontal
(Art McBride)
2. Re: [amsat-dc] Re: [Tracking] PhoneSat launch April 17th!
437.425MHz (Perry Klein)
3. Re: Mount an Arrow on rotator with 2m vertical orhorizontal
(i8cvs)
4. TH-D7 in kiss mode (Abdeslam Salah)
5. AMSAT/TAPR Joint Hamvention Banquet Menu Announced (Alan)
----------------------------------------------------------------------
Message: 1
Date: Tue, 16 Apr 2013 22:13:26 -0700
From: "Art McBride" <kc6uqh@xxx.xxx>
To: "'Douglas Phelps'" <dphelps1@xxxxxxxxx.xxx>, "'R.T.Liddy'"
<k8bl@xxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical
orhorizontal
Message-ID: <7FF387DF0F0B480D9C951F7F779E2234@xxxxxx>
Content-Type: text/plain; charset="iso-8859-7"
RT,
It is done all the time. Each antenna is 50 Ohms A 1/4 wavelength or any
other odd multiple will transform impedance. Two 100 Ohm impedance ends are
combined make 50 Ohms. The impedance of the transforming line = 50 Ohms
times 100 Ohms = 5000 to the 1/2 power is 70.7 Ohms. So 75 OHM (closest to
70.7 Ohm line) is the line of choice for the power divider section. If you
put 1/2 the power into each antenna the gain for two antennas is 3 dB over
the total power into one antenna. The gain comes from the narrowing of the
pattern for a net gain of 3dB if the antennas are identical, pointed the
same direction, same polarization, and separated by at least 1/2 wave
length.
Art,
KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Douglas Phelps
Sent: Tuesday, April 16, 2013 11:31 AM
To: R.T.Liddy; amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical
orhorizontal
Any reason why, using identical coax lengths, you could not transform the
impedance to 100 ohms and then use a T connector to sum both antenna signals
and
achieve 50 ohms to the radio?? I know Transmit power will be 3 dB down at
either
antenna but is there any reason it will not work?? Any antenna gurus out
there?
________________________________
From: R.T.Liddy <k8bl@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Tue, April 16, 2013 11:46:35 AM
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal
For the Satellites, it completely doesn't matter. At any given moment,
you only have 1 chance in 90 that you will have matching polarization.
?
So, if you plan to use the antenna for other than Satellites, set your
polarization
for that purpose (V for FM or H for SSB/CW).
?
My plan is to install 2 Elk antennas, one V and one H. Then, have a relay
that
I can switch between the two and choose the best downlink signal at any
given moment. This arrangement will also give me optimum flexibility for
terrestrial operation on 2 & 440.
?
Now, where can I find a relay to do that function?????
?
73/GL,??? Bob K8BL
--- On Tue, 4/16/13, Lee Maisel <maisel@xxxx.xxx> wrote:
From: Lee Maisel <maisel@xxxx.xxx>
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal
To: "Don Hoover (WS4E)" <ws4e@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Date: Tuesday, April 16, 2013, 12:24 AM
Hi Don,
I have mine mounted with 2m elements horizontal, because that's how it
seems I used it most when it was handheld.
Lee
W5LMM
Don Hoover (WS4E) wrote:
> Just wondering, should I mount my arrow with the 2m elements oriented
> vertical or horizontal?
>
> I am planning on putting it at 15deg and just using a az rotator.
>
> Does it even matter which way its oriented since the polarity of the sats
> are always changing?
>
> Maybe I should mount it like this: / instead.
>
> Just curious what some thought was the best way to go.
> _______________________________________________
> 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
_______________________________________________
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: Tue, 16 Apr 2013 22:17:08 -0400
From: Perry Klein <w3pk@xxxxx.xxx>
To: Samudra Haque <n3rdx@xxxxx.xxx>
Cc: Amsat-bb <amsat-bb@xxxxx.xxx>, "amsat-dc@xxxxx.xxxx
<amsat-dc@xxxxx.xxx>
Subject: [amsat-bb] Re: [amsat-dc] Re: [Tracking] PhoneSat launch
April 17th! 437.425MHz
Message-ID:
<CAGJME+EZPtDOS3e6t-hxVghPTC5QJe-gkk+mqJcc51vTQe_gEw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
If the sky is clear, the launch is supposed to be visible along the
Northeast Coast. From Washington, DC, azimuth is 140 degrees, elevation
about 10 degrees. NASA TV will cover the launch, and it will also be
streamed on the NASA web site www.nasa.gov/orbital
Perry, W3PK
On Tue, Apr 16, 2013 at 5:10 PM, Samudra Haque N3RDX & S21X <n3rdx@xxxxx.xxx
> wrote:
> An updated website with telemetry info is now available. Please note the
> launch date/time may change. I hope others will consider taking up the
> challenge to track 3 satellites operating on the same frequency and flying
> extremely close to each other.
>
> http://www.phonesat.org/packets.php
>
> 73 de NRDX
>
>
> On Thu, Apr 11, 2013 at 12:04 AM, Samudra Haque N3RDX & S21X <
> n3rdx@xxxxx.xxx> wrote:
>
> > I am forwarding a request from NASA ARC Phonesat project, relevant to my
> > mail earlier yesterday. This is a 3-for-1 special for amsat community.
> >
> > 73 de N3RDX
> >
> > ---------- Forwarded message ----------
> > From: Wolfe, Jasper Lewis. (ARC-RD)[Stinger Ghaffarian Technologies Inc.
> > (SGT Inc.)] <jasper.l.wolfe@xxxx.xxx>
> > Date: Wed, Apr 10, 2013 at 3:05 PM
> > Subject: Re: [Tracking] PhoneSat launch April 17th! 437.425MHz
> > Cc: "Guillen Salas, Alberto (ARC-SST)[Stinger Ghaffarian Technologies
> Inc.
> > (SGT Inc.)]" <alberto.guillensalas@xxxx.xxx>, "Tintore Gazulla, Oriol
> > (ARC-TH)[Stinger Ghaffarian Technologies Inc. (SGT Inc.)]" <
> > oriol.tintoregazulla@xxxx.xxx>
> >
> >
> > Hello CubeSats and Amateur Radio Operators!
> >
> > The very first PhoneSat?s will be launching aboard the Antares on April
> 17
> > th at 1700 EDT (launch window to April 19th possibly further). We have
> > manifested 2x PhoneSat 1.0 and 1x PhoneSat 2.0 Beta.****
> >
> > ** **
> >
> > Our orbit is very low (270km x 300km 51.6deg) and we?ll only be up there
> > for 2 weeks! So we?re looking for as many people as possible to help with
> > tracking our satellites!****
> >
> > ** **
> >
> > If any of you are interested in tracking the satellite please let myself
> > (+the cc?d team) know ? your help will be greatly appreciated! ****
> >
> > ** **
> >
> > All three satellites will be transmitting on *437.425MHz* and TLE?s +
> > more info can be found at www.phonesat.org ? consolidated info sheet
> > attached.****
> >
> > ** **
> >
> > Feel free to tune-in and submit packets to www.phonesat.org ****
> >
> > ** **
> >
> > Cheers!****
> >
> > PhoneSat Project****
> >
> > NASA ARC****
> >
> > ** **
> >
> > This time attached :D****
> >
> > _______________________________________________
> > Earthstation mailing list
> > Earthstation@xxxxxxx.xxx
> > http://lists.cubesat.org/mailman/listinfo/earthstation
> >
> >
> >
> _______________________________________________
> Via the AMSAT-DC mailing list courtesy of AMSAT-NA
> AMSAT-DC@xxxxx.xxx
> http://amsat.org/mailman/listinfo/amsat-dc
>
------------------------------
Message: 3
Date: Wed, 17 Apr 2013 13:59:31 +0200
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Douglas Phelps" <dphelps1@xxxxxxxxx.xxx>, "R.T.Liddy"
<k8bl@xxxxxxxxx.xxx>, "Amsat - BBs" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical
orhorizontal
Message-ID: <000b01ce3b63$05b3e5c0$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="UTF-8"
Hi Douglas,
Using two identical 50 ohm coax lenght you can't transform each 50 ohm
antenna impedance into 100 ohm but if you connect both 50 ohm coax cables
to a T connector than the resulting impedance at the common output of the T
connector will be 25 ohm i.e. two 50 ohm impedances in parallel and your
radio will see a VSWR of 50/25 = 2 and this is the reason it will not work !
BTW if you connect the above 25 ohm impedance to the input of a 1/4
electrical wavelenght long coax cable of 36 ohm impedance than at the output
of it you will get an impedance of 36^2 / 25 = 52 ohm toward the main feed
line with a good VSWR of about 1 in TX and RX
To build a 1/4 electrical wavelengt long of a transmission line of 36 ohm
impedance you can connect in parallel two 1/4 electrical wavelenght of
75 ohm coax cable like RG-59 or RG-11 i.e. 34,13 centimeters or 13,38
inches long for 145 MHz
BTW in this situation if both antennas are mounted in parallel one Vertical
and the other one Horizontal and if the elements are mounted on the same
plain with respect to the space than the resulting polarization of the
radiated field can be at 45 degrees like \ or at 135 degrees like /
depending at wich side of the dipoles the inner conductors of the 50 ohm
feed lines are connected.
73" de
i8CVS Domenico
----- Original Message -----
From: "Douglas Phelps" <dphelps1@xxxxxxxxx.xxx>
To: "R.T.Liddy" <k8bl@xxxxxxxxx.xxx>; <amsat-bb@xxxxx.xxx>
Sent: Tuesday, April 16, 2013 8:31 PM
Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical
orhorizontal
> Any reason why, using identical coax lengths, you could not transform the
> impedance to 100 ohms and then use a T connector to sum both antenna
> signals and achieve 50 ohms to the radio? I know Transmit power will be
> 3 dB down at either antenna but is there any reason it will not work?
> Any antenna gurus out there?
>
------------------------------
Message: 4
Date: Wed, 17 Apr 2013 11:35:43 +0000
From: Abdeslam Salah <salahabd11@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] TH-D7 in kiss mode
Message-ID:
<CAPuB=R2-BdRcPJAg5KHp1mNZjJP4rDhQ8CzOma4Xvr2QEQQdGw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=windows-1252
Hi All,
I?m a little bit disappointed. I try to use my kenwood TH-D7 in kiss mode.
When I send an APRS packet via [BCON] of my second kenwood TH-D7, I receive
this packet with my first kenwood TH-D7 operating in kiss mode but without
the flags (0x7E). Here is an example of what I received in Hex Format.
C0 20 A6 A6 60 A6 A0 A8 60 82 82 82 60 40 40 E0 A4 8A 98
82 B2 40 60 AE 92 88 8A 40 40 61 3 F0 27 7C 26 22 6C 20
1C 5B 2F 3E D C0
Same thing when I?m transmitting. I send the previous packet via the serial
port without the flags, and I received it perfectly with my handheld TH-D7.
I?m asking if my kenwood TH-D7 operating in kiss mode removes those flags
before sending the packet via the serial interface, and adding them before
sending the packet via RF? Or simply replace the flags with FEND?
How the kenwood TH-D7 operating in kiss mode deal with FEND character
inside the message? Should I replace the FEND with the two byte sequence
FESC TFEND or the TH-D7 do it himself?
73's
CN8XS
------------------------------
Message: 5
Date: Wed, 17 Apr 2013 13:56:48 -0500
From: Alan <wa4sca@xxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AMSAT/TAPR Joint Hamvention Banquet Menu Announced
Message-ID: <DA731AC5C254415F9C9AA8E39E4582A8@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Join us at the Dayton Hamvention this year for the AMSAT/TAPR Banquet on
Friday evening, 17 May.
"The Evangelist's Dilemma: Driving New Ideas With Nothing But Words."
Bruce Perens, K6BP, presents a humorous history of technology evangelism and
the things that inevitably go wrong, drawing from his history with Open
Source, No-Code, Software Freedom, Codec2, and Open Hardware, and
introducing a few of the new battle grounds.
Dinner Menu
Roast Prime Rib of Beef
Marinated Roasted Garlic Chicken Breast in lemon butter sauce
Italian Style Lasagna
Petite Double Stuffed Potatoes
Fresh Steamed Broccoli
Onion and Chive Red Potato Vinaigrette
Fresh Garden Toss Salad w/ dressings
Fresh Fruit Bowl
Rolls and Butter
Assorted Pies
Coffee, Decaf, Iced Tea, Hot Tea, and Water
The dinner will be held at:
The Kohler Presidential Banquet Center
4548 Presidential Way
Kettering, OH 45429
Doors open at 1830 for a cash bar, with buffet dinner served at 1915.
Orders must be placed in advance through the AMSAT Store (via AMSAT.ORG) or
through the AMSAT Office. Tickets will not be sold at Dayton, but tickets
purchased online may be collected at the AMSAT booth. Orders must be placed
by Tuesday, May 14th.
$30 per person
------------------------------
_______________________________________________
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 120
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