VK3SMB

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====== Programming the Codan 9313 without the codan software ======

As Codan have not released the software to the public to program the codan 9313 I had to think about it in a different way. For the record I did contact them asking to buy it (the software) and the reply was it is no longer available.

**In my view if it is no longer available, it should be made public domain**

In true amateur fashion I pulled the covers off and had a look.....

Inside on the control board is a 24C08 eeprom. I unsoldered this off the board and downloaded its contents.

The first frequency in the radio was 2020Khz for TX and RX.
Looking through the eeprom, the first 7 addresses were:
07 E4 00 07 E4 00 27

Without going into lots of detail on working it out, here is the low down

  *     The first 2 addresses are the RX Freq
  *     The next address is a spacer
  *     The next 2 addresses are the TX Freq
  *     The next address (the 27) is another space
  *     This pattern goes on for the next 14 Channels.

So 07E4 in hex is 2020 Decimal (2020Khz), So to add the frequencies I wanted I changed these hex addresses and re-wrote the prom. I added 8022Khz, VKS-737 channel 2. I changed the line of code to:
1F 56 00 1F 56 00 27

And it worked!

To make a receive only frequency, change the TX addresses to 00 00, ie
1F 56 00 00 00 00 27

I did not try to add more than 15 Channels nor did I try to go above 24Mhz.

I used a Willem programmer to change the eeprom, however any eeprom programmer should do the trick. To make it easier to program the frequencies in the future, I removed the IC and instaled an IC socket in its location, so 2 screws later I can reprogram the channels to whatever I want.

If someone wants to send me an eeprom image with the scan channels added I would love to have a look.

Maybe I'll write a little VB Program that can create Codan eeprom images, or even better, program the radio via RS232.
VK3SMB

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