JUMA Amateur Radio Forum

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Found a article from 5B4AIY (date 15 Mai 2016 12:33) which describe enough for me.
Also included a description and the firmware with bootloader.
I think this will work

72/3 de Frank, DG4FCO

Hi! As I read, Software-Updates will be done via PC into a running Juma. But, if I need/want to put the software in a fresh PIC (IC9 oin DDS), how to do this? The programming pins go to ICD2/J19, so it should be possible. Is there a small HowTo, because micro-controller programming is not my main ...

Hi Adrian,

thanks a lot, this helps!

vy 72/3 de Frank, DG4FCO

Hello, I wonder where the circuit diagram of the main board Rev. C is? http://www.jumaradio.com/juma-trx2/manual/TRX2manV2.6.5.pdf only contain diagram for Rev. B. As there are a few (minor?) differences between the two revisions I like to get the right one :) Can anybody give a hint/link? Thanks in ...

I did some high-res-fotos , so I can inspect my "Art" at a big Screen instead of looking through the magnifier.
So I may can start earlier, as I saved them on my web-site as usuall.

Please don't look, they are ugly


72/3 de Frank, DG4FCO

OK, I will do so. Unfortunately this weekend is Grandchild-Weekend OK, this is not un-fortunately but funny
So it will take some days, maybe weeks until I can spend enough time for this.

I swear, I will give report!

72/3 de Frank, DG4FCO

Hello Juha,

also thanks to you. I should analyze more photos and try educated guess
Especially because some parts of the chassis was changed by the manufacturer,
as I also notive with my other handicraft work.

72/3 de Frank, DG4FCO

Hello Adrian, thanks for the values! I tried to find out, how to separate some modules to test them, but maybe it was too late in the evening for my brain. Do you have some more hints like "remove R113" to seperately test the main board? I didn't found such information in your document you send me ...

Hi all! Now I am done with all parts and did checks as mentioned. Optical check seems ok, Check of DDS Board with own power supply works. Unfortunately there must be a short-circuit, so I disassemble it and check board by board. There must be a short-circuit at the main board, somewhere in the 5V ...

Thank's Adrian,

this Picture help a lot.
There should be more pictures outside of our building experience


72/3 de Frank, DG4FCO