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Forum Index : Microcontroller and PC projects : Decoding FSK on MM
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OA47 Guru  Joined: 11/04/2012 Location: AustraliaPosts: 926 |
Do you think that it is possible to decode 75 bps FSK with a mite? My initial investigations show that the frequency measurement takes a long time and may not be responsive enough to grab each frequency change even at 75 bps. |
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vk4tec Senior Member  Joined: 24/03/2012 Location: AustraliaPosts: 239 |
It might be ok with an extrenal PLL ? I know a simple cct can be used to do RTTY like my grandad did. You lock onto a tone and then the PLL gives a zero or a one for FSK. 75 bps should be easy as with the PIC32 Andrew Rich VK4TEC NE567 ? Andrew Rich VK4TEC www.tech-software.net |
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djuqa Guru Joined: 23/11/2011 Location: AustraliaPosts: 447 |
MM-FSK sounds like a Great project Let's start looking at the options VK4MU MicroController Units |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 926 |
Djuqa, I am currently producing the FSK using one mite by tying the RS232 TX to 2 digital I/p and sensing the pulse rise or fall and producing the appropriate frequency. Best Regards |
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| vk4tec Senior Member Joined: 24/03/2012 Location: AustraliaPosts: 239 |
I can think of many ways to interface with external pll circuit You could use mixw32 to make rtty or psk signals I have some easyradio modules I need to integrate as well 434 MHz 100 mw Andrew Andrew Rich VK4TEC www.tech-software.net |
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| ThierryP Newbie  Joined: 12/04/2012 Location: NetherlandsPosts: 12 |
Graeme, Some simple external circuitry would certainly do it (2xNE567 or 1xPicaxe 08M2), but I also did provide a possible way forward in MM-Basic that could just about be able to do this, here: Link Thierry |
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