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View of the main operating position at EA4LE /KC2HAX. The hearts of the station are the Rx/Tx rigs in the top shelve a Yaesu FT-847 Satellite Transceiver and a Kenwood TS-850S HF Transceiver. The TS-850S is mostly used as IF Rx for a wide range of bands (V/UHF and microwaves) with different Rx converters. Both rigs are computer controlled for automated/unattended operation on digital satellites. On the desktop are some of the different modems and data controllers I have built at home. A homemade QRP HF transceiver is also partially seen in the left of the photo. 

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This is the Satellite Tracking System currently in use at the station. The system is based on the TrakBox developed by Sueo Asato, M.D. JA6FTL. The system controls the antenna position to track any satellite and controls the receiving and transmitting equipment for Doppler correction. I am currently working on a new tracking system based on a Parallax BasicStamp micro-controller to replace this equipment  in service since the early nineties.

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Left.- A genuine TAPR-2 TNC board. The real thing! I built this board specifically for high speed (9k6 bps) packet applications, that’s why the onboard 1k2 bps modem was not constructed. Rigth.- My second attempt -and the first successful- to build a 9k6 modem. First attempts were made with an earlier K9NG design, at this time the most difficult part of the job was finding other stations to test the system on terrestrial links. The modem in the photo (pigging-back on a MFJ TNC) is the 9K6 TAPR design by Lyle Johnson, WA7GXD, Chuck Green, N0ADI and Eric Gustafsson. The board is revision one modifications to improve the clock recovery system can be seen. This modem -built in 1993- and TNC are still on service at the station and are used to for the RUDAK experiment on board AO-40. 

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Left.- This was my first DSP (Digital Signal Processor) system. I built one of the first AMSAT/TAPR DSP-93 kits, for a full review article (in Spanish) on the DSP-93 look elsewhere in this site. Right.- The DSP-93 was later replaced by new unit based on a Motorola DSP56002 a more powerful 24-bit processor. However the trend at KC2HAX is the increasing use of computer soundcards and specific software for most of the applications but a very few. 

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