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- Using the TI 320C26 DSK-based Modem with PCTOR
- ----------------------------------------------
-
- This is an experimental program that uses an unmodified
- TI 320C26 DSK (Digital signal processing Starter's Kit) to
- implement an all digital signal processing HF modem. The
- modem is a non-coherent fsk filter type.
-
- Using this hardware arrangement, no other external modem or TNC
- is required to decode AMTOR ARQ and FEC traffic. All that is
- required is to apply an audio signal from the transceiver
- to the DSK's A/D input. With the DSP firmware loaded and running,
- the modem functions is performed in real time on the
- DSK, while PCTOR performs AMTOR decoding. Presently there is
- no provision for transmission or PacTOR decoding.
- A future version of PCTOR will include a control panel for the
- DSP modem and integrate both modem operations and AMTOR/PACTOR
- decoding. This option will be released at a later date.
-
-
-
- In order to experiment with this software, it is assumed that
- you are familiar with the TI 320C26 DSK's functionality, as well
- as with PCTOR.
-
- 1. Copy the files MODEM.EXE, MODEM.DSK, and DSK_DRV2.DSK
- to your PCTOR subdirectory.
-
- 2. Prepare the DSK, powered up and connected to the serial port as
- for DSK development. A small modification on the DSK serial
- connector at the PC end of the DSK serial cable is necessary:
- jumper RD and DCD (pins 3 and 8 on a DB25). This is
- necessary for compatibility with PCTOR.
-
- 3. Start PCTOR.
-
- 4. Select the "M" option in PCTOR's main menu to modify the
- output mask to 1. PCTOR and the DSK will now use the same
- logic level on the DTR line. Remember that DTR is used for
- resetting the DSK. The DSK will use RD/DCD to communicate
- to PCTOR. Exit the main menu.
-
- 5. Shell out to Dos form withing PCTOR (using the F8 key).
-
- 6. Load the modem firmware into the DSK by executing "MODEM".
-
- 7. Terminate the Dos shell by typing "exit" - control returns to
- PCTOR with the DSK loaded and running the modem code.
-
- 8. Tune to an AMTOR ARQ/FEC signal (assume you know how to do this).
- You will find that the modem filters are not too fussy and will
- tolerate some frequency errors. The A/D will handle a wide range
- range of signal levels - from barely audible signals to very
- load ones.
-
-
- Good luck and enjoy,
-
- 73
-
- Johan Forrer (KC7WW)
- 26553 Priceview Dr,
- Monroe, OR 97456
- United States of America
-
- October 21, 1993
- ---------------------------------------------------------------------------
-
- Note:
-
- The 320C26 DSK is trademark by Texas Instruments Co. This
- software was developed using the TI DSK development package.
- The bootloader "DSK_DRV2" is as supplied on the TI BBS.
-
- This experimental software is for amateur usage and is provided
- "as is". The author, is not liable for any damage, due to the
- usage of this software.
-