Jim, Mike DK3WN and I have done some work evaluating CP6 Decoding. Like you we have difficulty decoding CP6 with hardware TNC's. Best performance is to use MixW, with audio from the data port. We have passed this information to the CP6 Team who are investigating the TNC Header that CP6 sends. It is also important that you tune the lower tone to 1200 Hertz. In my case I use Spectran to monitor the audio. I will forward you a small .wav file separately that has two good decodeable bursts that you can use to evaluate your system. Best regards, Colin VK5HI.

-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org]On Behalf Of James Denneny Sent: Wednesday, 17 June 2009 00:53 To: amsat-bb@amsat.org Subject: [amsat-bb] CP6 Decoding

I am troubleshooting a CP-6 decoding problem. I have excellent copy on CP-6. Keps are good. Signal is strong but no decode.

Equipment is IC-910H and AEA DSP2232. I checked everything out with APRS FM copy on 144.390 using hyperterminal - good copy in FM packet.

PC & TNC use com 3 - 9600,8.N,1 to communicate. PC flowcontrol is hardware. DSP2232 is set for MOD p12 (p1 1200bps). I do not see any TNC lockup during data bursts. Radio is set for LSB when tracking CP-6.

I even tried using hyperterminal connection in lieu of CP-6 decoder. NADA

What am I missing?

Jim

K7EG

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