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Ari Kaspari ari.kaspari at googlemail.comHi thank you for your comment. What do you think about the following thought: I take two old radioscanners each has 12.5 kHz channel pattern ("Kanalraster") , Tetra uses 25 kHz. Then I make for each scanner a FM modulation in Software or on FPGA and after a signal addition. Now i should have the modulated Pi/4-DQPSK signal back. Or haven’t I? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/tetra/attachments/20121217/b52d2981/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: Unbenannt.jpg Type: image/jpeg Size: 24026 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/tetra/attachments/20121217/b52d2981/attachment.jpg>