Atlantic 5-Day Graphical Tropical Weather Outlook

Atlantic 5-Day Graphical Tropical Weather Outlook

via Atlantic 5-Day Graphical Tropical Weather Outlook



Joint USAF/NOAA Solar and Geophysical Activity Summary SGAS Number 111 Issued at 0245Z on 21 Apr 2018

A. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep
1358 1358 1400 170
1403 1431 1434 690000
B. Proton Events: None.
C. Geomagnetic Activity Summary: The geomagnetic field reached
major storm levels due to effects from a CIR.
D. Stratwarm: Not Available
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 073 SSN 014 Afr/Ap 029/038 X-ray Background A5.7
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 2.9e+06 GT 10 MeV 1.6e+04 p/(cm2-ster-day)
(GOES-15 satellite synchronous orbit W135 degrees)
Daily Electron Fluence
GT 2 MeV 2.80e+07 e/(cm2-ster-day)
(GOES-15 satellite synchronous orbit W135 degrees)
3 Hour K-indices:
Boulder 3 4 6 5 4 4 4 3 Planetary 3 5 6 6 4 4 5 3
F. Comments: None.


Testing the MC3356 Spectrum Analyzer Part 5

Randys Bench

I‘ve now reached a convenient break point in construction (well sort of, I’m still working on the filter module) and I thought I’d take a look at current circuit operation and performance. Below is the current state of the analyzer hardware (a few days ago):

Here are a few notes concerning this state of build:

1. The 1st Mixer LO frequency range is way off (should be ~ 145 – 235 MHz range). The schematic and parts BOM in RadCom’s 1989 article is really intended for a particular layout. PCB’s were produced at that time for all circuit modules i.e. rf board, sweep generator and PS/marker generator. JAB electronics in the UK have had these cards at various times although I’m not sure if they have them in stock currently. Anyway, working with VHF frequencies the layout matters a great deal and particular values need to be customized accordingly…

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April Fools’ Crash? China’s Space Station Will Most Likely Plunge to Earth in Next 24 Hours


via April Fools’ Crash? China’s Space Station Will Most Likely Plunge to Earth in Next 24 Hours

China’s First Space Station Will Reenter the Atmosphere in About a Week

China didn’t intend for the Tiangong-1 space station to last forever, but it also didn’t want the station to plummet into the atmosphere randomly. After China lost control of the aging space platform, scientists around the world set to work tracing its position to find out when and where it would reenter the atmosphere. We’ve got it narrowed down a little today. Dr Marco Langbroek, who has been watching Tiangong-1 closely, says it’ll come down in the next week or so.

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