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Re: [Raspberry_Pi_4-Ham_RADIO] TNC-PI - 300 and 9600 Versions

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  • Max Harper
    You might want to have a look at some of Mike Bergs projects found here.   http://www.ringolake.com/pic_proj/pic_index.html   Might give you some ideas
    Message 1 of 7 , Apr 3, 2013
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      You might want to have a look at some of Mike Bergs projects found here.
       
       
      Might give you some ideas anyways. I think he is working on transmitting PSK63 using a Pic chip. I think modes such as PSK63 work much better than 300 baud on HF.
       
      Max
       
      From: John Wiseman <john.wiseman@...>
      To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
      Sent: Wednesday, April 3, 2013 10:31 AM
      Subject: [Raspberry_Pi_4-Ham_RADIO] TNC-PI - 300 and 9600 Versions
       
      I hope to be able to produce both 300 and 9600 versions of the TNC-PI. I was planning to get them done last Autumn, but the current version took a bit longer than I expected, and I decided to port my BPQ32 package to linux, and that has also delayed things.
       
      I think the main problem will be finding suitable modem chips with a reasonable price and availability. For 9600 I was thinking of using the CMX589A, which is used in some DSTAR projects. For 300 I may go for the XR2211 for receive and software TX. I've looked at routines for packet RX using the PIC. I didn't have much luck, but others seem to be able to get them to work.
       
      Does anyone have experience with these chips, or have any other suggestions?
       
      73, John G8BPQ
       
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