James Morris
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James Morris
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Evil Mad Scientist
emsl@mastodon.cloud
Announcing the acquisition of Evil Mad Scientist by Bantam Tools.
Dr. Windell Oskay & Lenore Edman will be joining as CTO and COO of Bantam Tools in Peekskill NY.
Pen plotter enthusiasts can look forward to a new generation of art machines in Spring 2024.
More at: https://www.evilmadscientist.com/2024/bantam-tools/
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Here's a trace of the power up sequence, with the gate voltage at the top, and drain at the bottom. I'm not sure if the CRO is fast enough to catch the sequence correctly, because I can't tell if there's a gap between gate & drain. IIUC, the negative regulator chip provides a 'voltage ok' signal that is used to switch the gate, so it should be ok. But, I'll keep investigating until I'm sure.
This is the kind of thing that leads to long development times for amateur microwave radio projects, so many (fascinating) rabbit holes and a lot of learning as you go. I wonder if more people knew about this aspect of the hobby, whether we'd see more and younger people joining.
This is the kind of thing that leads to long development times for amateur microwave radio projects, so many (fascinating) rabbit holes and a lot of learning as you go. I wonder if more people knew about this aspect of the hobby, whether we'd see more and younger people joining.
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James Morris
jmorris
@MLE_online tell me you're not in the PNW right now without telling me...
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Load testing the bias power supply. The amp uses an expensive ($650) GaN transistor which must have bias applied before main power, or it will be destroyed - it’s ‘on’ by default and needs bias to switch ‘off’. I’m being extra careful with this, will also verify the power up sequence on a scope, response to short circuit etc.
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James Morris
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Paul Moore
securepaul@fosstodon.orgSELint, a linter for SELinux policy sources, released a new version yesterday: SELint v1.5.
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@jtfletchbot btw, the PCB and housing is from Lothar Baier, https://texasmicrowave.com/ . Saves a mountain of busywork for me.
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@jtfletchbot I believe it can produce more linear power with higher voltage and aggressive cooling, but 25W will be a good start.
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James Morris
jmorris
@jtfletchbot this is for a TGA2623-CP device (yet to arrive), with the aim of 25W out for about 60mW in.
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James Morris
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James Morris
jmorris
@LWN they grow up so fast
RE: https://fosstodon.org/users/LWN/statuses/111581306340618478
RE: https://fosstodon.org/users/LWN/statuses/111581306340618478
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James Morris
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@warthog9 Many thanks to you and
@monsieuricon 's work here and your continued work to keep vger alive all these years, it's one of the primary reasons that Linux development works so well.
@monsieuricon 's work here and your continued work to keep vger alive all these years, it's one of the primary reasons that Linux development works so well.
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James Morris
jmorris
Edited 1 year ago
Just a warning for people thinking about getting into #microwave #amateurradio -- it's an infinite labyrinth of hobbies, knowledge, and equipment. Precision machining, stripline circuits, strange semiconductors (IMPATT diode amplifier, anyone?), exotic electron tubes (which will try and kill you via xrays, lethal voltages, and beryllium oxide), metrology, physics, DIY, vintage equipment resurrection, morse code (modulation? sheer luxury!), scouring ebay, haunting electronics stores, poring over poorly scanned service manuals from defunct companies, and too many hex keys.
Oh, and it's a gateway drug to #radioastronomy.
#hamradio
Oh, and it's a gateway drug to #radioastronomy.
#hamradio
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James Morris
jmorris
Edited 1 year ago
@evacide Yikes. How much information did Verizon actually need to collect or keep?
RE: https://hachyderm.io/users/evacide/statuses/111608814425154905
RE: https://hachyderm.io/users/evacide/statuses/111608814425154905
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