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CX2SA > SATDIG 10.03.09 02:10l 151 Lines 4529 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: AO-10 Report On Sat Status (MM)
2. Dayton Hotel Rooms (Martha)
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Message: 1
Date: Mon, 9 Mar 2009 05:49:05 -0700 (PDT)
From: MM <ka1rrw@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-10 Report On Sat Status
To: amsat-bb@xxxxx.xxxx Gordon JC Pearce <gordonjcp@xxxx.xxx>
Message-ID: <306155.74992.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Q Chris Bloy wrote:
> How strong would it be? Would you pick it up with a 3-ele
> yagi?
>
Hi All:
In theory you can work a satellite such as AO-10 (in a Molnyia Orbit) with a
Zero Gain antenna system. You just need to be in the right place a the right
time.
The orbit for AO-10 varies in altitude from 2,560 Miles (4,120 km) to 21,747
Miles (35,000 km ) every day (twice a day).
If the low orbit Dip is close to your House then you will have a 15 ?30
minute opening when a Zero Gain antenna system will work for a few minutes
(assuming AO-10 is running that day). However as soon as the satellite starts
to climb in altitude, you will need to switch over to a higher gain antennas
such as a 9-12 dBd system.
In the spring of 1994 I worked AO-13 many times with a pair of Zero Gain Ringo
vertical antennas mounted to my Apartment Deck (on a hill, with 200-watt
amps). The Secret was timing. I would plan ahead and then wait for the low
altitude dip to take place near my apartment in Boston and set aside that time
to work people on AO-13. My window of access time was very limited to
approximately 15-30 minutes of good access, before the satellite screamed up
to higher altitude.
After my new house and tower were installed, I switched over to a full AZ/EL
antenna system (22 elements CP on 2 meters (element gain ~10 dBd) and 40
elements (element gain ~14 dBd) on 440 CP, Amps and LMR-600). At the higher
altitude?s 21,747 Miles (35,000 km ) I could still work AO-13, however AO-10
was much more difficult.
This Month March 2009 AO-10?s Low dip is in the South Pacific and in the South
Indian oceans. Has anyone heard AO-10 recently? I would like to give it a
try again.
73 Miles WF1F Marexmg.org
Note: I prefer to use the terms Element gain because it cuts out the
Advertisement hype.
Most advertisers add an extra 3-6 points of gain to an antenna. If you ever
see an antenna advertised with two letters ?dB?, always subtract 3+ to convert
it to ?dBd?. Or Just count how many Half-wave dipoles are in this antenna and
use the chart.
Antenna power tips
http://www.marexmg.org/fileshtml/packetpower.html
--- On Sun, 3/8/09, Gordon JC Pearce <gordonjcp@xxxx.xxx> wrote:
> From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
> Subject: [amsat-bb] Re: AO-10 Report On Sat Status
> To: amsat-bb@xxxxx.xxx
> Date: Sunday, March 8, 2009, 7:00 PM
> Chris Bloy wrote:
> > Hi All,
> >
> > I see that IK2MKE has reported hearing AO-10, any idea
> if this is
> > possible?
> >
>
> How strong would it be? Would you pick it up with a 3-ele
> yagi?
>
> I could hear *something* on 145.810MHz but I'm in
> the middle of a
> city so it could be just about anything. I'll try in
> an hour to see if
> I can rule out local QRM.
>
> Gordon
> _______________________________________________
> 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!
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------------------------------
Message: 2
Date: Mon, 9 Mar 2009 11:03:00 -0400
From: Martha <martha@xxxxx.xxx>
Subject: [amsat-bb] Dayton Hotel Rooms
To: amsat-bb@xxxxx.xxxx Board of Directors <bod@xxxxx.xxx>,
officers@xxxxx.xxx
Message-ID:
<956751cf0903090803u1a3ddfb5nc2d87fd7857cca08@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Remember to get a room in the AMSAT block, you must:
1. Be an AMSAT Member
2. Volunteer to work the AMSAT Booth
3. CALL ME not the hotel (301-589-6062)
--
73- Martha
------------------------------
_______________________________________________
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 4, Issue 115
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