Automatic Packet Reporting System (APRS) developer Bob Bruninga, WB4APR, is looking for someone who will build a linear satellite transponder for PSK31.

“If someone will build a linear PSK31 transponder, I have a launch opportunity in 9 months,” Bruninga said in a posting to the AMSAT Bulletin Board. “All it needs to be is a PSK31 linear receiver on 28.120 MHz (3 kHz bandwidth) with AGC coupled to a downlink UHF FM transmitter of about 1 W,” and the transponder should be able to fit on a 3.5 inch square card. Bruninga points out that this is the same as devices the Brno University of Technology has built for prior missions of PCSAT2. Two are on the shelf, he says, but the university may not have the people to construct a third one for the new flight opportunity.

He, PSK31 developer Peter Martinez and Mirek Kasal, OK2AQK, have posted a PSK31 Transponder Concept on his website. — AMSAT News Service