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CX2SA > SATDIG 16.02.12 22:06l 162 Lines 5390 Bytes #999 (0) @ WW
BID : AMSATBB779
Read: GUEST
Subj: AMSAT-BB-digest V7 79
Path: IZ3LSV<IK6ZDE<F1OYP<F4ERG<CX2SA
Sent: 120216/2003Z @:CX2SA.SAL.URY.SA #:51248 [Salto] FBB7.00e $:AMSATBB779
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Dick Daniels (Martha)
2. Re: TransAtlantic Balloon on 28 MHz ? (Roger)
3. Re: TransAtlantic Balloon on 28 MHz ? (John Magliacane)
4. Re: TransAtlantic Balloon on 28 MHz ? (Bob Bruninga)
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Message: 1
Date: Thu, 16 Feb 2012 11:02:11 -0500
From: Martha <martha@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>, Board of Directors <bod@xxxxx.xxx>,
AMSAT Officers <officers@xxxxx.xxx>, Jan King
<jking@xxxxxxxxxxxxxxxxxxx.xxx>
Cc: amsat-dc@xxxxx.xxxx Mark Kanawati <mark@xxxxxxxxxx.xxx>, Tak
Okamoto <ja2pki@xxxxxx.xx.xx>
Subject: [amsat-bb] Dick Daniels
Message-ID:
<CAPk0USwORY5LmbSsyuLfZJeY8Cm=3nK1mntNcut+4Wv-Zvoo_A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
A memorial service will be held for Dick Daniels, W4PUJ on Saturday,
February 25th at 1:00PM . The location is the Little River Presbyterian
Church, 6025 Little Falls Rd, Arlington VA 22207. In lieu of flowers, the
family suggests a contribution to: Capital Caring, 950 N Glebe Rd #500,
Arlington VA 22203. This is the organization that provided hospice care for
Dick.
--
73- Martha
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Message: 2
Date: Thu, 16 Feb 2012 11:39:48 -0500
From: Roger <Rogerkola@xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: TransAtlantic Balloon on 28 MHz ?
Message-ID: <4F3D3154.5030403@xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
CB uses vertical beams...the difficulty is that they have to have a non
metallic mounting pole extending into the beam or be end mounted (think
torque)
With enough planning I'm sure enough hams could chase something up and
use empty Stationmaster radomes, fiberglass poles or even schedule 80
pipe to get something up.
Roger
WA1KAT
On 2/16/2012 12:18 AM, Bob Bruninga wrote:
> Do you have a 10 meter (28 MHz) vertically polarized beam?
>
> We are working on a 28 MHz transatlantic Balloon with a CW transmitter on
10m using (of course) a vertical dipole.
>
> It will have no GPS, so tracking will be entirely by beam headings and
some signal-strength assessment.
>
> Just wondering if anyone has a vertical beam.
>
> A horizontal beam will be useless for direction finding. All it will do
is point to whatever is reflecting the energy into the strongest horizontal
component...
>
> Hummh...
> Bob, WB4APR
> _______________________________________________
> 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: Thu, 16 Feb 2012 11:37:43 -0800 (PST)
From: John Magliacane <kd2bd@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: TransAtlantic Balloon on 28 MHz ?
Message-ID:
<1329421063.8122.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
--- On Thu, 2/16/12, Roger <Rogerkola@xxx.xxx> wrote:
> CB uses vertical beams...the difficulty is that they have to have
> a non metallic mounting pole extending into the beam or be end
> mounted (think torque)
The mounting pole may contribute some capacitive or inductive loading
effects on the elements adjacent to it, but a smart antenna designer can
modify the antenna's element lengths to compensate for these effects.
The pole itself will have a negligible effect on antenna performance, unless
it happens to be resonant (or very close to resonant) at the operating
frequency. Otherwise, it's essentially transparent.
> On 2/16/2012 12:18 AM, Bob Bruninga wrote:
>
> Just wondering if anyone has a vertical beam.
If the signal is strong enough (and/or the receiver sensitive enough), an
electrically small loop antenna can be used for 28 MHz radio direction
finding purposes.
A vertically oriented loop will respond to vertically polarized RF. (In
reality, it's responding to the horizontally polarized H-field).
The ARRL Handbooks and Antenna Books have carried designs regarding 28 MHz
RDF antenna for many decades.
73, de John, KD2BD
------------------------------
Message: 4
Date: Thu, 16 Feb 2012 14:51:06 -0500
From: "Bob Bruninga" <bruninga@xxxx.xxx>
To: "'Joe'" <nss@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: TransAtlantic Balloon on 28 MHz ?
Message-ID: <050b01ccece4$52829550$f787bff0$@xxx>
Content-Type: text/plain; charset="us-ascii"
>> Just wondering if anyone has a vertical beam.
>> A horizontal beam [for this vertical balloon signal] will be
>> useless for direction finding....
> That is only true when receiving the signal
> via direct line of sight propagation.
The transmitter is only 10 milliwatts, so we only expect line-of-sight
contact. So that is why I was assuming we'd need a reasonable polarization
match. But who knows... maybe we will get some good OTH signals.? The
altitude will not be super high though, (like in the ionosphere)..
Bob, WB4APR
------------------------------
_______________________________________________
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 7, Issue 79
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