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Mike Walters
Electronics, RF, reverse engineering. Author of inspectrum. MM0MZW. he/him
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Mike Walters 20 h
RT : 's work on porting gr-osmosdr's to Qt and python 3 is now in the gr3.8 branch of Please test and report. If no blockers are found, this branch will become the new master and first tagged release with 3.8 support.
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Mike Walters 20 h
Odgovor korisniku/ci @tnt
is it ok if i manually "retweet" this?
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Mike Walters 2. velj
Odgovor korisniku/ci @zipcpu @kbeckmann i 3 ostali
My changes are in the repo above & tagged as RevC. The main change is to fix the RevB errata mentioned in the README. Otherwise, some layout cleanup & the option for a programmable oscillator.
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Mike Walters 1. velj
Odgovor korisniku/ci @kbeckmann
Smoke test passes, and a quick test with the GreatFET puts it into RX mode successfully 🙂
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Mike Walters 1. velj
Odgovor korisniku/ci @bitshiftmask
I think it's still really interesting if it's made easy to re-target, because then you could use it for bring-up on any new board design.
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Mike Walters 31. sij
Odgovor korisniku/ci @kbeckmann
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Mike Walters 31. sij
Odgovor korisniku/ci @kbeckmann
We won't speak about try #2, but I'm very happy with try #3 aside from maybe a bit too much paste applied? I don't think I was pressing hard enough. I might have trouble with that QFN.
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Mike Walters 31. sij
Odgovor korisniku/ci @kbeckmann
First go was surprisingly good, but I think I smudged it a little on release. Should still work fine!
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Mike Walters 31. sij
Odgovor korisniku/ci @kbeckmann
All ready for paste application. I've not done this in a _while_ so this might take some tries.
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Mike Walters 31. sij
Odgovor korisniku/ci @kbeckmann
Time to do some assembly! First job is to depanel these stencils...
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Mike Walters 30. sij
Odgovor korisniku/ci @assortedhackery
and.. there's the problem - some of the traces are completely blown out. Someone put way too much power into this at some point 😟
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Mike Walters 30. sij
Odgovor korisniku/ci @assortedhackery
I managed to carefully press the PCB out of its housing. Now we can see what's going on properly! It looks like a Pi-attenuator, with a neat grid structure to allow for trimming resistor values after construction.
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Mike Walters 30. sij
Odgovor korisniku/ci @assortedhackery
Some more detail of the PCB
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Mike Walters 30. sij
Odgovor korisniku/ci @assortedhackery
The damage on the end wasn't me :) I doubt it happened during assembly, so maybe someone else has opened this up before. I'm not sure if the blackening at the contact point is normal tarnishing, or evidence of too much power going through this part at some point...
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Mike Walters 30. sij
Odgovor korisniku/ci @assortedhackery
The actual attenuator - it looks like a ceramic PCB with printed resistors, plated ends to make contact with the spring-pins, and pressed into this tube to hold it in place.
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Mike Walters 30. sij
Odgovor korisniku/ci @assortedhackery
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Mike Walters 30. sij
Odgovor korisniku/ci @assortedhackery
Teardown time 🙂
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Mike Walters 30. sij
Odgovor korisniku/ci @gsuberland
I had it for free on BT Cellnet somehow though!
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Mike Walters 27. sij
Thermocouple interface boards arrived from so I can finally fix up 's T962A reflow oven!
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Mike Walters 26. sij
Odgovor korisniku/ci @cybergibbons
Had to be done..
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