azonenberg changed the topic of #scopehal to: libscopehal, libscopeprotocols, and glscopeclient development and testing | | Logs:
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<monochroma> :D
<azonenberg> Excited to see how they perform
<azonenberg> they're actually impedance controlled unlike the old oshpark ones
<azonenberg> And are, i think, lower loss
<azonenberg> I say "i think" because i don't actually know what Df of the flexible soldermask was so i had to guess a bit :p
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<azonenberg> oook this is conclusive
<azonenberg> I know what's wrong with the AKL-PD1
<azonenberg> I shorted the inP and inN terminals together, turned on the amplifier, and got something like -30 dBm of wifi out
<azonenberg> The ground plane under the diffpair is floating at the tip end (it would have to be, there's nothing to ground it to since the whole point of a diffprobe is not to have a common mode connection to the DUT other than for grounding reasons)
<azonenberg> The ground plane is also about 125mm long
<azonenberg> Which makes it an almost perfect full wave dipole for 2.4 GHz ISM band
<azonenberg> It may be a horrible probe but i think it's actually a halfway decent wifi antenna :D
<azonenberg> monochroma: ^
<azonenberg> basically my signal trace is a coplanar waveguide sandwiched between wifi antennas
<azonenberg> Now i need to do something about that
<azonenberg> I'm wondering about doing a single layer board with an edge coupled diffpair just floating on substrate, no ground anywhere nearby
<azonenberg> this should force a fully differential propagation mode
<azonenberg> it'll basically act like a twisted pair would, except not twisted
<azonenberg> The question then is what do i do with the ground at the SMPM connector? i guess i can just float it and see what happens
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<monochroma> azonenberg: heh! i win!
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<azonenberg> Yay probe updates! Ordered some slide-on ferrite corers as well as stick-on ferrite sheets to play with reducing common mode noise on the AKL-PD1 (may do this instead of, or in addition to, a respin without the ground plane)
<azonenberg> Also the AKL-PT2 prototypes scanned in hong kong, cleared chinese customs for export, and are eta Thursday
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<azonenberg> So it looks like I might be getting another Tek MSO4/5/6 loaner scope soonish
<azonenberg> apparently some of the devs at tek have heard of my woes and there was a major refactoring of a lot of the SCPI code going on
<azonenberg> They're interested in feedback on the new beta firmware
<azonenberg> They're probably gonna send me a demo scope running the new code on a couple of weeks
<azonenberg> I look forward to seeing if they've improved it. The MSO6 looks like really nice hardware if only the scpi interface wasn't so buggy
<azonenberg> More importantly this should give me a direct line to Tek's firmware team to discuss ways to make the APIs for future instruments better
<azonenberg> I'm very curious if they'd be interested in trying out the dual socket model at some point (SCPI for control plane and then push-based data)