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ZL3AI > APRDIG 05.11.03 15:14l 125 Lines 4111 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Nov 03, 2/2
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: RE: Ballon launch information
From: Gonzales Andy <agonzales@arc.nasa.gov>
Date: Mon, 3 Nov 2003 15:40:45 -0800
X-Message-Number: 16
You will need to get some FAA and possibly military approvals and you
can't just launch anywhere. You'll also need to do some good weather
predicts. I managed two launches to over 100,000 ft. for NASA /
Ames.
--
Andy Gonzales
KG6RWO
NASA / Ames Research Center
Moffett Field, CA 94035-1000
Bldg. N-244, Rm. 240
MS 244-19
agonzales@arc.nasa.gov
650-604-0309
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Subject: RE: Ballon launch information
From: David VanHorn <dvanhorn@cedar.net>
Date: Mon, 03 Nov 2003 18:53:47 -0500
X-Message-Number: 17
At 03:03 PM 11/3/2003 -0800, Scott Miller wrote:
>Just keep in mind that DF'ing a very short periodic beacon is not the
>easiest thing to do...
Indeed!
With a little micro, you can do a periodic transmission for a period of
time, then switch over to continuous at the point where you figure it must
have been on the ground for some time. You could do more with external
sensors, but just with time alone, you can do a pretty good job.
I don't know if this scales well, but in my rocketry days, I used to have a
long string with a small weight, deployed with the parachute. The string
lays on top of the grass, and makes the whole thing easier to find.
a 500' string might be rather bulky!
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Subject: RE: Ballon launch information
From: "Scott Miller" <scott@opentrac.org>
Date: Mon, 3 Nov 2003 16:14:02 -0800
X-Message-Number: 18
How about a 100' long ribbon attached to a smaller balloon with a higher
burst altitude? Might serve as a parachute in the air and a marker on the
ground...
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Subject: RE: Ballon launch information
From: "Scott Miller" <scott@opentrac.org>
Date: Mon, 3 Nov 2003 16:16:13 -0800
X-Message-Number: 19
My understanding is that no permit is required under FAA part 101 as long as
it doesn't meet any of these criteria:
(i) Carries a payload package that weighs more than four pounds and has a
weight/size ratio of more than three ounces per square inch on any surface
of the package, determined by dividing the total weight in ounces of the
payload package by the area in square inches of its smallest surface;
(ii) Carries a payload package that weighs more than six pounds;
(iii) Carries a payload, of two or more packages, that weighs more than 12
pounds; or
(iv) Uses a rope or other device for suspension of the payload that requires
an impact force of more than 50 pounds to separate the suspended payload
from the balloon.
Still, a call to the FAA NOTAM number couldn't hurt....
Scott
N1VG
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Subject: RE: Ballon launch information
From: Jacob Tennant <k8jwt@adelphia.net>
Date: Mon, 03 Nov 2003 19:32:10 -0500
X-Message-Number: 20
OK, maybe I misused the foxhunting term as not a "Foxhunt" as we commonly
do it but a package tracking & recovery hunt using APRS.
David VanHorn wrote:
>At 03:03 PM 11/3/2003 -0800, Scott Miller wrote:
>
>>Just keep in mind that DF'ing a very short periodic beacon is not the
>>easiest thing to do...
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Subject: Digitraveler antenna mods
From: "Scott Miller" <scott@3xf.com>
Date: Mon, 3 Nov 2003 20:22:54 -0800
X-Message-Number: 21
Has anyone successfully replaced or relocated the patch antenna on the
Digitraveler GPS? I'm scrounging up parts for my first low-budget balloon
experiment and the tiny little patch looks a bit inadequate. I'd rather use
a helix if possible.
The rest of the package is just a gutted DJ-S11T and an OpenTracker with
onboard temperature sensor and maybe a barometric altimeter. Nothing fancy
for my first attempt. I'm open to suggestions for 2-meter antennas - just
planning on using a 1/4 wave whip right now.
Scott
N1VG
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END OF DIGEST
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