@assortedhackery

Electronics, RF, reverse engineering. Engineer at @GSGlabs & author of inspectrum. he/him. @miek@mastodon.social

 Scotland
assortedhackery.com
Joined March 2014
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354Media
btw i'm miek at mastodon dot social if you want to follow me there
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hmm, i think there's something wrong with this etch a sketch
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Happy release day! HackRF 2022.09.1 is now available: github.com/greatscottgadgets…

Release 2022.09.1 · greatscottgadgets/hackrf

To upgrade to this release, you must update libhackrf and hackrf-tools on your host computer. You must also update firmware on your HackRF. Major changes in this release include: Opera Cake, an a...

github.com
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This weekend I added support for the Agilent 86100A sampling scope to glscopeclient/scopehal, along with support for GPIB adapters using the linux-gpib library. Here it is showing a 10Gbps eye diagram 🤩
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Tracking down an issue where my sampling scope wouldn't trigger on one of the inputs. VNA trace suggests there's a hairline break somewhere, since there's a lot of loss at low frequencies but S21 increases with frequency (due to capacitive coupling):
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I tested across the switch that selects between inputs and there's definitely a fault in it, but it's got a spare input! So I swapped the cable over and modified the control cable to swap the signals
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and it's all good again! 🎉
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.@sharebrained's PortaPack plectrum: also handy for demoulding
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coffee
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Mike Walters retweeted
Daniel Estévez@ea4gpz18 Feb 2022
New blog post: Demodulation of the LTE uplink. A self-contained hands-on walk through the analysis of the uplink signal. The post assumes some knowledge of OFDM, but no previous knowledge of LTE. We demodulate some PUSCH slots that I have recorded from my phone. (1/9)
A waterfall of an LTE signal, showing different blocks corresponding to uplink transmissions using different time-frequency allocations. Both data and control transmissions are visible.

ALT A waterfall of an LTE signal, showing different blocks corresponding to uplink transmissions using different time-frequency allocations. Both data and control transmissions are visible.

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Mike Walters retweeted
AmSat-EA@AmsatSpain15 Jan 2022
Good News!! ✌🏽 #EASAT2 working perfectly although antennas seems not deployed!! CW received:
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Mike Walters retweeted
Catherine@whitequark10 Dec 2021
nMigen is now called Amaranth HDL! follow it to its new home at github.com/amaranth-lang and the #amaranth-lang IRC channel on libera.chat
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Mike Walters retweeted
Catherine@whitequark16 Dec 2021
I've just released Amaranth 0.3! github.com/amaranth-lang/ama… see the full changelog at amaranth-lang.org/docs/amara…

GitHub - amaranth-lang/amaranth: A modern hardware definition language and toolchain based on Python

A modern hardware definition language and toolchain based on Python - amaranth-lang/amaranth

github.com
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Mike Walters retweeted
Catherine@whitequark17 Dec 2021
the story continues: a ~week *after* the project has been renamed, I receive an email from GitHub Trust & Safety talking about trademark infringement xitter.cf/marcan42/status/135860…
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I'm working on reverse-engineering a pager codeplug format and I wrote a handy little script to help. It constantly watches the save file for changes and prints a diff:
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Just doing my due diligence before getting a new piece of test gear... 😇
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Been working on some debug tools for LUNA dev, I modified a @1bitsquared HyperRAM PMOD with extra-long headers for easy logic analyser probing
iCEBreaker FPGA board with HyperRAM PMOD and logic analyser attached

ALT iCEBreaker FPGA board with HyperRAM PMOD and logic analyser attached

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and with captures from that, I wrote a HyperRAM protocol decoder for glscopeclient (and added support for digital channels on Agilent/Keysight scopes!)
Screenshot of glscopeclient software, showing HyperRAM protocol decoding

ALT Screenshot of glscopeclient software, showing HyperRAM protocol decoding

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