Circle On Reader Service Card

Yaesu Day Sale

Prizes every 1/2 hour Extended hours 9am Yaesu rep on hand Refreshments

Yaesu Day Sale

Metro: (612) 786-4475 Nat'l: 1-800-426-2891 Super Minnesota Watts: 1-800-279-1503 2663 Country Rd. I, Mounds View, MN 55112

Date: Saturday October 13,1990 — 1 day only Time: 9afn 10 6pm

Drawing: from tickets handed out at the door - need noi be present to win grand prize circle332 on reader service card

73 Amateur Radio « October, 1990 77

Photo D. KE5SR (far left) helps scouts make contacts via 2 meters, prior to tuning in A-O-13. (Photo by N5DIB.)

shore Park on Bolivar Peninsula near and a six-foot dish.

Galveston did just that. With a basic array of Cushcraft antennas and various rigs, including a Yaesu FT-726R and a Yaesu FT-73GR. we had many enjoyable contacts through AMSAT-OSCAR 10h A-O-13 and RS-10, FujiOSCAR 20 was not available for Mode JA (2 meters up and 70 cm down) analog activity and we did not have any digital equipment beyond the simpte packet system for 2 meter terrestrial work. The Mode B (70 cm up and 2 meters down) transponder on A-O-13 sounded like 20 meters during a DX contest

The Mode L (23 cm up and 70 cm down) transmit system at our location was not sufficient for any QSOs via the satellite, but it did provide a nice ATV contact on 12G9 MhU with NISI across the bay. Last year we had a four-foot dish with a circuiariy-polar-ized feed horn and 35 watts through 20 feel of Beiden 9913 coax This year, the power was rhe same but the feed-line was longer and the antenna was a linearly-polarized modified corner reflector. Less antenna gain and more transmission line losses added up to no contacts. Next year will be different. We'll be using a cam-bination 1,2/2.4 GHz feed system

There are other opportunities during the year for portable activity Many Boy Scout camporees and demonstrations nrovide an excellent environment for experimenting and demonstrating satellite operation with simple systems.

Bob Schaer N5DIB got Scouts in-voived with 2 meter and 70 cm satellite antenna construction. They used wooden tent poles lashed together for the mount and adjusted the elevation while monitoring a simple Sears inclinometer and checking azimuth with a Boy Seoul issue compass. Keeping the antennas Just clear of the ground during pointing is all that is required for hamsat contacts when the path to the sky and ihe desired satellite is clear. With today's solid-state radios, a large car or deep-cycle battery can run everything.

Even less is required for RS-10 activity via Mode A A simple omni antenna for the 2 meter uplink and a dipole for the 10 meter downlink takes care of the antennas, while a multimode 2 meter transceiver and an HF rig cover the equipment needs.

Check last month s "Hamsats" for details on simple but effective installations. f£]

From Micro Computer Concepts

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