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F4DAV

@f4dav

Amateur radio, SDR. https://www.pabr.org | https://www.youtube.com/user/pabrdotorg

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16.11.2024
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Latest posts by F4DAV @f4dav

The Space Review: From TACSAT to JUMPSEAT: Hughes and the top secret Gyrostat satellite gamble

So it had a spinning main bus and a despun sensor platform ? I want to see the space-qualified slip rings :-)
www.thespacereview.com/article/4096...

29.01.2026 13:33 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

To be fair, this seems to fit in the same fairing footprint as the real thing. The telescoping forward bus is a smart way to make the ribs straighter. The sub-sats are a bit extravagant, though.

29.01.2026 13:14 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Puzzling indeed. Is there evidence that they transmit all the time, and not just above some ground station near yours ? I'm not sure whether figure 2 shows RF sightings or just the orbital planes.

17.10.2025 11:06 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Hmm, technically can't they increase capacity simply by launching larger phased arrays and/or moving to shorter wavelengths ? Their next-gen satellites are rumored to be 2000 kg (vs 260 kg for the first constellation). Whether this makes economic sense is another debate.

23.07.2025 19:51 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Back in my day when the sysadmin managed load-balancers, firewalls, computers, storage, backups, HTTP daemons and back-end databases, and users provided the business logic, it was called CGI scripting :-) Today, FAAS or Serverless ? As in AWS Lamba or Google Cloud Functions.

14.04.2025 14:31 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Preview
NSR-SDR-X/S โ€” Vulcan Wireless, Inc.

Probably coming from this 5 W SSPA SDR modem. www.vulcanwireless.com/nsr-sdr-x/s

03.03.2025 21:45 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

My first guess was particle physics, but then considering your published work I thought it could also be orbital mechanics :-)

09.12.2024 21:43 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Either that, or the copper gauge is thinner in that wire :-)

04.12.2024 08:38 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0