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DFM17 Repurposing for ham use
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Clif Brown
Mike (KD4EAT) did a presentation on repurposing VS 41 Sondes at our last conference and mentioned interest in doing the same for Graw DFM17 sondes.
I've recovered five DFM17s and wanted to look into porting the Horus code to these devices. Has anyone been working on that recently? I haven't found anything on GitHub (or elsewhere), but before I headed down that path, I thought this group might know of recent work I could "leverage." Cliff KW4CL |
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Michael Hojnowski
Cliff,
Myself and "MrArm" (the guy with the github page) have puttered with it off and on. It looks fairly straightforward, and we're at the point of having to port to the si4063 chip. It doesn't look like a big deal, but neither of us have had the spare time to putter with it in the last few months. If you get involved with it, I suggest getting on the Recessim Discord. He and I are both on there, and could probably offer some docs / insights. Also, you'll definitely want to get an ST-link (not a cheap clone) for working on it. It needs the NRST line, which isn't available on the super cheap clones without making a hardware mod. Mike / KD2EAT On 1/16/23 07:51, Clif Brown wrote: Mike (KD4EAT) did a presentation on repurposing VS 41 Sondes at our last conference and mentioned interest in doing the same for Graw DFM17 sondes. |
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Clif Brown
Thanks Mike!
I'll order an ST-Link. Does the ST-Link function on a Nucelo board also work? (I can't remember why, but I've got one of those development boards) I also signed up for the Discord -Cliff/KW4CL |
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Michael Hojnowski
Cliff,
I've got a nucleo w/stlink as well. I didn't have luck with it, though it didn't really make sense to me. I just know MrArm was doing fine with a genuine stlink and I couldn't manage with my clone or my nucelo stlink. I actually punted and switched to using a j-link interface I have, but that's not ideal either as DFM doesn't expose all the pins I need for j-link. Anyway, I figured the shortest path to victory would be to just go ahead and order a real stlink with the NRST pin. In fact, this reminds me that I need to go do that. lol. Mike On 1/18/23 10:45, Clif Brown wrote: Thanks Mike! |
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trcostan
Does the sonde have a MCU that writes to the Si4063? Changing the frequency is just a matter of changing the data in a register of the SI4063 and of course verifying nothing in the RF chain will cause a problem. Do you have a link to a pic or partial schematic of the sonde? I could spend sometime on this sound’s interesting. Tyler KB0PQP  On Wed, Jan 18, 2023 at 10:08 AM Michael Hojnowski <kd2eat@...> wrote:
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