Photo by Mark Fahey
Many thanks to SWLing Post contributor, Paul Evans, who shares the following video from an MIT/W1MX presentation series:
MIT Video: How antennas work
The SWLing Post
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Unfortunately this video employs a presentation-slide overlay that is poorly placed, and hides crucial information being provided non-verbally by the lecturer.
The lecturer frequently uses a laser pointer to identify items on the slide in the lecture hall, but the overlay displaying the slide in the video is positioned so that it hides where the laser pointer is aimed at the projection screen in the lecture hall.
Consequently there are many instances where the lecturer says something is happening “here,” indicating where that is with the laser pointer, but the overlay makes it impossible to see what part of the diagram is being pointed at. After a short while this becomes very frustrating!
Presumably other viewers of this video who have praised it unreservedly are already so familiar with the subject that they know what part of the diagram is being highlighted, even though it is impossible to actually see it in the video. But those for whom this material is novel should be prepared to be repeatedly mystified by remarks like “it happens here” or “this is the important thing to look at” without being able to see where or what that is.
Super lecture, thanks.
Mike Todd
About the Morse code transmission caught in Brazil, I think the puzzle was solved by Ary Boender and Nils Schiffhauer: Russian Navy!
https://youtu.be/GIQrUmc_59I
Hello Thomas,
I sent you this message via e-mail but decided to post here, just in case, for all of your reader to have a look and give me a help.
This Morse code transmission was listened in Porto Alegre, Brazil, on February 28, 2020, 07h27 (Brasilia’s time), 10h27 (UTC), using a Tecsun PL-606 receiver with only the telescopic antenna.
https://www.youtube.com/watch?v=6LwdaEzU1Bc
Part of the message I caught reads “QSU JEQYT4 ZZZ K, R8IE TH D LMNA K, LMNA A K”.
Shipboard communications?
Maybe “QSU” refers to “Request to Transmit”, “ZZZ K” a NATO Z-code and “LMNA” “Land-based Multi-purpose Naval Aircraft”?
Any idea? Thank you for your attention!
Carlos Latuff
Porto Alegre
Brazil
Thanks for this lecture, it was excellent.
Excellent video presentation brings back happy memories of aerial lectures during my H.N.D. studies