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ARISS Contact at Hawthorne Brook School

November 29

, 2005 was the culmination of two months of intense preparation for an ARISS

contact between the International Space Station and Hawthorne Brook Middle School in

Townsend.

The middle of September the Nashoba Valley Amateur Radio Club had been contacted with a

request to provide radio communications for the event by Steven Best VE9SRB (contact for the

previous club) and Marilyn Richardson N1CSH (the teacher) at Hawthorne Brook School. They had

been involved in the original application in April 2002 for a space station contact. The club that had

signed up on the original application was no longer able to support the event. After some brief

discussions and a club meeting poll NVARC decided to support the event. The kids after all had

already been waiting three and one half years for this to happen.

From that point on it was a scramble to assemble the required two satellite stations for the

contact. Not having been involved in the original application we had a lot to learn.

It is important to keep track of what has been done and what needs to be done. Devote a

notebook to the project. Take notes when talking to the mentor. Make lists of equipment and

sources. Record measurements such as cable lengths, distances at the site, and make sketches.

Having all your information in one place will save time.

Ralph KD1SM and Stan KD1LE immediately made a site visit to the school to check out the

grounds. This first visit was to get the general layout, determine where we could place antennas,

and see where the classroom was with respect to where we could place antennas. This was

done on a weekend so it was strictly an external assessment. Another visit took place to check

out the classroom and see what access would be like for putting antennas on the roof. We also

looked more closely at the adjacent athletic field and the basketball court near the classroom.

Drawings were made of the site. The original application listed no obstructions but knowing

something of the terrain we had concerns. The obvious omission was the tall and heavy tree

cover directly south of the school. If the pass were to the south and less than a sixty degree

elevation we would be shooting through the dense pine trees. The plus side was that anticipated

ISS passes were expected to have Acquisition of Signal (AOS) in the southwest which was over

the athletic field and Loss of Signal (LOS) in the southeast where the trees would be farther away

and thinner. These were the optimum places since a high ridge runs east-west on the north side

of the school. It is very important to verify the horizon limits of the site by reviewing either

topographical maps or a computer program to do terrain profiles. A satellite spends a significant

portion of the total pass time near the horizon. This means that avoiding obstacles such as heavy

tree cover or hills is critical to maximizing the total pass time. Little did we know at the time that

even some distant hills that were below the tree line would have an impact on the RF horizon. In

the next few days Ralph did several iterations of what our horizons would be trying to look at

some worst cases depending on where AOS and LOS were.

During the interior school survey we found that the school had a membrane roof and access was

from the opposite end of the building via an internal ladder. This would make it difficult to move

any significant equipment to the roof. The roof lacked any structures that could be used to secure

antennas. The roof was also only 22 feet high so considering the risk of roof damage and the

difficulty of putting equipment up there for the limited height gain we chose not to use it. Since we

were already concerned about the hills and trees we decided it would be worthwhile to exercise

another option we had. Several of the club members jointly own a 100 foot tower trailer. It is

pictured later in this paper. Using the tower trailer we could put antennas near the tree tops by

extending it only 75 feet. This would keep the antennas out of the wind and minimize the number

of guys sets needed. This height would significantly reduce the loss from the trees. It would also

have a small but beneficial effect on the horizon. We needed a good place to set up the tower

S. Pozerski KD1LE 1 08 February 2006

1 2 3 4 5 6 ... 20 21

Vertical 22 EL CP 17
14 EL CP 20

Inhaltsverzeichnis

Seite 1

ARISS Contact at Hawthorne Brook School November 29th, 2005 was the culmination of two months of intense preparation for an ARISS contact between th

Seite 2

From the preamplifier box constructed by W1XP a line was run to the mixer board input labeled line # 1 (downlink audio). Set this line input level wi

Seite 3

Courtesy KB1ESRWithout notice on the day of the event the audio requirements expanded to providing audio to two adjacent classrooms. The challenge wa

Seite 4

Courtesy KB1ESR Above is the secondary station with tracking computer, rotator control, radio, and power amplifier. Joel W1JMM and Les N1SV operate

Seite 5

Courtesy W1JMM Above is the primary antenna for the contact. The 432 antenna on the right was not used for the contact. It was used during testing

Seite 6

Courtesy KD1LE The backup antennas arrived ready for deployment. The secondary yagi was transported assembled with its coax and rotator cable rolle

Seite 7

Tuesday morning we arrived around 10:00 AM and continued set up and testing. The crew was composed of Larry KB1ESR, Bob W1XP, Dick KB1MBR, Stan KD1LE

Seite 8

Courtesy KD1LE About ten minutes prior to the expected AOS Marilyn gave an introduction to the students and visitors. Behind the students are vario

Seite 9

The school provided a pizza lunch after the event. After everyone had calmed down we started packing up. It took a while to pack all the equipment

Seite 10

The primary station has a 22 element circular polarized yagi on a 100 ft crank up tower mounted on a trailer. This antenna uses computer controlled a

Seite 11

This antenna was used to work UHF up and VHF down satellites for system evaluation during station assembly and check out. It was left on the boom as

Seite 12

and decided to use the paved basketball court right outside the classroom. This was approximately 125 feet from the building so our cables would be l

Seite 13

Bird watt meter 160 watt Power Amplifier 14 EL CP FT-847 Transceiver Audio Preamp Astron 35 amp Power Supply LMR400 coax Radio Shack Rotator Control

Seite 14

understand its limitations early so that expectations are realistic. Our feedback from stations further south along the track was that Bill could alw

Seite 15

When we started assembling the second station Hank Lane KB1JLA supplied the second rig. Once we received the primary and secondary frequency matrix w

Seite 16

The available antennas needed to be repaired, some elements replaced, matching cables built, and the antennas tuned and checked out. The antennas we

Seite 17 - Vertical 22 EL CP

satellite is to pass to the north of your location the rotator will run into the stop. At this point it will have to rotate fully around to continue

Seite 18

yagi to give about one S unit better signals than the 14 element. We also found the vertical to be very usable once the ISS was well above the horizo

Seite 19

problem and cause LOS at an elevation just under 3 degrees. With this information we estimated the total length of the contact. This would be less t

Seite 20 - 14 EL CP

based on one KHz frequency shift increments. When this was done we had seven receive and seven transmit frequencies in each table. The frequencies w

Seite 21

An Olympus Digital Voice recorder (VN-4800 PC) was placed on the podium setup to handle the two transmitting Microphones. The VN-4800 will record for

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