Date   

Re: Helium

Zack Clobes <zclobes@...>
 

Did you get our tank?
 
Zack Clobes, W0ZC
Project: Traveler

----- Original Message -----
Sent: Tuesday, June 18, 2002 2:59 PM
Subject: [GPSL] Helium

If we order six tanks of helium for GPSL, I can get them at $45
each.  I'll need 1.5 tanks, Mark asked for 1, and I've had a request
for another tank. 

Please let me know if you need helium.  I need to order two more
tanks to get the lower price.

Who can help me move tanks to the launch site?

Paul


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Time Slot APRS

Michael Gray <mgray@...>
 

If a TDMA (Time Slot) method of sharing the 144.34 MHz frequency is used
for APRS, someone should specify if the time is GPS or UTC. There is
currently a 13 second difference between the GPS and UTC time of day. Most
GPS engines correct for the difference and report UTC, but not all of them
do or they can be configured to report either one.


Re: Meal Reservations

Zack Clobes <zclobes@...>
 

We'll have four adults and about 3 children (I'm assuming Jon's kids will be with him)
Zack Clobes, W0ZC
Project: Traveler
 

----- Original Message -----
Sent: Wednesday, June 19, 2002 4:43 PM
Subject: [GPSL] Meal Reservations

I'll be in Kansas on the 1st of July.  At that time I'll make
reservations at the Gold Fork and Sirloin Stockade for 20 people. 
Is there a consensus that that is a good working number?

Paul

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Re: Got Helium?

Zack Clobes <zclobes@...>
 

We'll go ahead and pay for a full tank, but we'll only be using a 600g balloon for 2lbs.  We could probably get by with other people's remains.  A couple of half tanks should be more than enough.
 
However it works out.
Zack Clobes, W0ZC
Project: Traveler

----- Original Message -----
Sent: Wednesday, June 19, 2002 4:40 PM
Subject: [GPSL] Got Helium?

Here's the list of people I have wanting helium.  If you're name
doesn't appear and you want helium, please let me know ASAP. 
I'll check email on Friday and update my list.  If you get this
message after Friday, please leave a message on my cell phone
(208) 631-7162.

Me
Mark Conner
Bill Brown
Zack Clobes
Mike Bogard

Helium is $45 a tank, payable during the symposium.  I plan to
drop the tanks off at the Johnson Near Space Center on the 2nd of
July.  I'll pick up an extra tank.  I'm assuming everyone wants just
one tank.  The tanks hold something like 240 cu ft of helium, so I've
had to use part of a second tank to launch a 12 pound capsule. 
With the extra tank, we'll have 6 tanks, the minimum needed fo the
$45 price.  I'd like to see if I can talk someone into getting a
second tank as a backup.  I'll have all tanks gauged before leaving
Linweld, just to make darn sure we don't get an empty tank.

I still need to line up help moving helium tanks, Linweld will not
deliver tanks at this price.

Paul



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Re: Meal Reservations

Mark Conner <n9xtn@...>
 

NSTAR will have about 6.

- Mark

----- Original Message -----
From: <paul.verhage@boiseschools.org>
To: <GPSL@yahoogroups.com>
Sent: Wednesday, June 19, 2002 16:43
Subject: [GPSL] Meal Reservations


I'll be in Kansas on the 1st of July. At that time I'll make
reservations at the Gold Fork and Sirloin Stockade for 20
people.
Is there a consensus that that is a good working number?

Paul


Re: More GPSL frequency coordination items

Mark Conner <n9xtn@...>
 

Answers below from TVNSP, Traveler, and KD0FW.  Still awaiting inputs from EOSS and WB8ELK.
 
I define "time-slotting" as the ability to keep your transmissions between X and Y seconds after the minute, using the time reported in the NMEA output from your GPS.
 
EOSS:  Can your 144.34 payload time-slot its beacons?  What callsigns will you be using?
 
TVNSP:  I believe you're using the KPC-3+ second serial port to control transmissions for your 144.34 payload - is this correct?  If so, you can therefore time-slot.  Are you planning to fly a backup beacon - if so on what frequency?  What callsigns will be used?
 
TVNSP will transmit between :00 and :11 using KD4STH-11.  No backup beacon.
 
WB8ELK:  Can you time-slot your 144.34 beacons?  If not, does it beacon every X seconds, or is it semi-random?  What call do you plan to use?
 
KD0FW:  Is it OK to change your simplex repeater to 147.585, or do you have another frequency you'd prefer?
 
KD0FW's simplex repeater will be on 147.585 MHz.
 
Traveler:  You sent me e-mail earlier that your programming will not time-slot.  Is it every X seconds, or semi-random?  I think as long as it's not too close to 60 seconds for a repeat interval we shouldn't have a problem.
 
Traveler will beacon at an interval of a few seconds more or less than 60 so we don't hit one payload's slotted beacons all the time.
 
73 de Mark N9XTN
 


Re: More GPSL frequency coordination items

Bill Brown
 

Mark,

I'll have my frequencies figured out this weekend and will post it on the
group.

- Bill WB8ELK


Re: Meal Reservations

Bill Brown
 

Depending on whether I can convince someone to travel along with me from
Huntsville, AL....there will be either 1 or 2 for dinner.

- Bill WB8ELK


Re: Time Slot APRS

Mark Conner <n9xtn@...>
 

Time slotting should be done using UTC, which is the normally
reported time in GGA and RMC strings.

73 de Mark N9XTN

----- Original Message -----
From: "Michael Gray" <mgray@ess-us.com>
To: <GPSL@yahoogroups.com>
Sent: Wednesday, June 19, 2002 21:28
Subject: [GPSL] Time Slot APRS


If a TDMA (Time Slot) method of sharing the 144.34 MHz
frequency is used
for APRS, someone should specify if the time is GPS or UTC.
There is
currently a 13 second difference between the GPS and UTC time
of day. Most
GPS engines correct for the difference and report UTC, but not
all of them
do or they can be configured to report either one.

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Sproul

paul.verhage@...
 

I just got word, Keith can't make the symposium.

Paul


Phone Numbers

paul.verhage@...
 

Ralph and Mark, can you give me a phone number to contact you?
I don't believe I'll have email access after Friday.

Paul


Display Space?

paul.verhage@...
 

Does anyone need space to display their program? I'll arrange for
tables if given notice.

Paul


TVNSP Payload Update

paul.verhage@...
 

TVNSP will fly the following payload.

APS camera on scan boom
Geiger counter
Relative humidity and temperate sensor
Mementos
Idaho Airborne Assault (Mr Potatohead with a parachute)

Paul


A/V

paul.verhage@...
 

I just got an email from my mother. There will be a TV/VCR,
overhead projector, and an LCD projector with PC and VCR
connections.

I'll check out the equipment in two weeks when I get to hot and
humid Kansas.

Paul


Reservations and Helium

paul.verhage@...
 

I have the following dinner reservations

Traveller: 7
NSTAR: 6
Bill Brown: 2
Me: 1

Based on these numbers, I'll make reservations for 30. Does this
sound good?

For helium, I have the following reservations

Bill Brown: 1
NSTAR: 1
Traveller: 1
Mike Bogard: 1
TVNSP: 2
EOSS: 2

Based on these numbers, I'll get 8 tanks of helium. There may be
two half empty tanks in this number, so there should be some
cushioning.

Paul
100,000 feet. Been there, Done that.


First prediction

Mark Conner <n9xtn@...>
 

Granted, 2 1/2 week forecasts aren't worth much, but I ran one anyway.

For consistency's sake, I'm going to run predictions using 1000 fpm
ascent, 1000 fpm sea-level descent, burst at 95,000 ft. Bursts at
lower altitudes will move the predictions a few miles east. Faster
ascent and descent will (in general) shorten the distance along the
same direction as the original prediction.

With these conditions in mind, the forecast I ran shows a landing 9.5
miles from launch on a bearing of 054 degrees. The forecast indicates
we should have warm humid conditions (low 90s in the afternoon) with
afternoon and evening thunderstorms.

73 de Mark N9XTN


I-gate coverage for GPSL

Mark Conner <n9xtn@...>
 

Chris WA5RRN in Topeka will provide I-gate coverage for 144.34 MHz for
the flights. This should get all but ANSR on the Internet.

73 de Mark N9XTN


Long-range forecasts

Mark Conner <n9xtn@...>
 

The long-range forecasts for the 6th fall into one of two categories so
far:

1) The high-pressure ridge at 500mb and above is right on top of
Kansas or a little to the east. This makes for southerly winds at the
surface with plenty of Gulf moisture and heat. The upper winds are
very light, making the landing somewhere within a 10-15 mile circle of
the launch site.

This isn't so good as there is a large reservoir to the north of the
launch site, one to the west, and Fort Riley in between. If we land NE-
SE-S of the launch site, we're OK.

2) The ridge shifts westward a bit. This puts the surface high right
over Kansas, making the winds light or northeasterly at the surface.
Aloft, the winds are from the west or northwest at 20-30 knots.

This scenario gives us more pleasant weather (high 80s with drier air
instead of 90s and humid) and a landing about 30 miles to the east or
southeast. This in general puts us in a more favorable area for a
landing.

So far, none of the predictions have indicated a chase >40 miles, so we
may be able to stick around after launch for up to an hour and
entertain questions, etc.

73 de Mark N9XTN


Time slot assignments

Mark Conner <n9xtn@...>
 

I've given the five groups who can time slot on 144.34 their
slots. See
http://members.cox.net/n9xtn/gpsl_2002_freq_coordination.htm for
details. The data will probably be on Ralph's page soon.

I went with 12-second windows once per minute because I figured
trying to hit a six-second window may be difficult if you want to
send more than one packet. Comments welcome - it's not too late.

EOSS has indicated they are still considering whether to fly ATV
or the cross-band repeater - probably will not be both. If
anyone else has updates on their payloads (especially RF-emitting
ones), let me know.

73 de Mark N9XTN


Re: Reservations and Helium

Don Pfister <ka0jlf@...>
 

Paul, I do not see my helium listed or dinner reservations (however, I didn't
make dinner reservations because I wasn't sure if when we would make it).

paul.verhage@boiseschools.org wrote:

I have the following dinner reservations

Traveller: 7
NSTAR: 6
Bill Brown: 2
Me: 1

Based on these numbers, I'll make reservations for 30. Does this
sound good?

For helium, I have the following reservations

Bill Brown: 1
NSTAR: 1
Traveller: 1
Mike Bogard: 1
TVNSP: 2
EOSS: 2

Based on these numbers, I'll get 8 tanks of helium. There may be
two half empty tanks in this number, so there should be some
cushioning.

Paul
100,000 feet. Been there, Done that.
--

[Signature File]
Name=Don Pfister KA0JLF
HABITAT SkyLab soon to add SeaLab (underwater robotics)
(High Altitude Basic Investigation Testing And Tracking)
Email=ka0jlf@earthlink.net or ka0jlf@kc.rr.com or donp@netlab.org

http://habitat.netlab.org
http://www.kc.net/~dpfister - going away not sure when they will pull the plug
http://www.netlab.org/~donp
http://home.earthlink.net/~ka0jlf
http://home.kc.rr.com/cdpfister/
http://www.netlab.org:8888/ Visit the Lab in the Hobby wing. HABITAT being
built...

view stations on the web real time (~3 minute updates):
http://www.findu.com/cgi-bin/find.cgi?KA0JLF Home
http://www.findu.com/cgi-bin/find.cgi?KA0JLF-9 van
http://www.findu.com/cgi-bin/find.cgi?KA0JLF-11 balloon

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