Stephen J Birkill

[Stephen J Birkill @midvodian]

@RevRichardColes Nothing less than brilliant: just need you to teach me how to do rock accompaniment the way you did on that vintage S Shaw clip :)

[Stephen J Birkill @midvodian]

Apollo 13 :

55 years since voyage
30 years since movie
50 years since song
6 years since song video

#Apollo13
#PolynesianWayfinding
#CelestialNavigation
#Canoe

[Stephen J Birkill @midvodian]

https://t.co/EHROaMIEHt -- Canoe: Apollo 13 allegory in song! #Apollo13

[Stephen J Birkill @midvodian]

@coastal8049 (2) Subsequent log entries show similar signals at both apogees. E.g.Several carriers logged on Dec 7th 1980 between 974 and 998 MHz, but same ?FSK at 998, Russian apogee. Others 978 & 980 MHz, Canadian apogee. M2 or M3 birds carried 'Programma 4' TV at 3675MHz, Canadian.

[Stephen J Birkill @midvodian]

@coastal8049 (1) My first Molniya-1 sighting was May 7th 1976 at 07:00 UT, 140kHz FSK nominally 998 MHz (no SDR back then, rudimentary gear meant only approx estimate of freq.) at Russian apogee. Later, hand-over observed 20:45, signals duplicated with ~500kHz freq sep'n, 10 deg apart.

[Stawamus Chief Webcam @StawamusChief]

A video of last night's rockfall on the Stawamus Chief, seen from the Stawamus Chief Webcam. I think the flashes of light are sparks as the rocks collide on the way down. #Squamish #SquamishBC #StawamusChief #TheChief @squamishchief

[Stephen J Birkill @midvodian]

@gm8arv @uhf_satcom @Raspberry_Pi Can't see your other replies, but this is NXP MMIC wideband amp BGA2689 in SOT 363, from their Malaysia factory. G=32dB, NF=3.2dB @ 2150 MHz. So nothing special.

[Stephen J Birkill @midvodian]

@coastal8049 Correction: E Europe & C Asia incl Turkmen (Sys K/L) use 6.5MHz intercarrier in 8MHz channel, so f-audio is 309.75 + 8N. Top channel is Ch.69 (861.75MHz). China has its own grid.

[Stephen J Birkill @midvodian]

@coastal8049 Ashgabat tower gets mentions on line, but nowhere can I find channel numbers or frequencies.

[Stephen J Birkill @midvodian]

@coastal8049 Also note high-side conversion: channel freqs are inverted: UHF PAL/SECAM TV transmits sound carrier HF of vision, Meridian downlinks it LF.

[Stephen J Birkill @midvodian]

@coastal8049 Uplink freq clues: 'Euro' 8-MHz grid, audio at (309.25 + 8(https://t.co/DRgtiBCsjK)) MHz, e.g. Ch.68 @ 853.25MHz. Need ch alloc's of nations at <5 deg el to CAN apogee (NGA/TCD/SDN/EGY/SAU/IRQ/TKM/UZB/KGZ/KAZ/CHN/MNG), also 6 MHz NTSC grid where analog persists (BRA?)

[Stephen J Birkill @midvodian]

@StawamusChief @abirkill Fabulous!

[Stephen J Birkill @midvodian]

Impressive!

[Stephen J Birkill @midvodian]

@abirkill Could be the sat had a far brighter specular a fraction of a degree off your location, which illuminated some high-altitude haze?

[Stephen J Birkill @midvodian]

@abirkill @stripe Bravo! Shame their logo perpetuates the tired image of 'digital' as implying visibly quantised/aliased/blocky/pixellated.

[Stephen J Birkill @midvodian]

@abirkill Isn't that Rocky? Rocky 3, perhaps?

[Stephen J Birkill @midvodian]

@abirkill Beats the flying car!

[Stephen J Birkill @midvodian]

@abirkill Bet you couldn't believe your eyes when you saw that red car one storey up, too.

[Stephen J Birkill @midvodian]

@abirkill #Portland, according to a TV drama I watched a day or two back: "Portland? It rains. Like London, but with hippies". Fine today!

[Stephen J Birkill @midvodian]

@abirkill Wow! And the view too!