Uses a 12 key keyboard and texts like an old Nokia phone with multiple keypresses. http://www.technoblogy.com/show?2AON&fbclid=IwQ0xDSwL88ShjbGNrAvzr1WV4dG4DYWVtAjExAAEeX19OxuYe1QO8mrox71F6Zl_KCUppukTfJn3iSrHyEVT51xLwOmz2jhPHLKY_aem_is4HJCST113TNXDXWaTXGw
Archive for the ‘Radio Frequency’ Category:
2025-07-24 Gyrotron, 1 MW, Thales TH1507 For Stellarator
https://ieeexplore.ieee.org/document/8874589 Matt Undecided showed a photo of it.
2025-07-09 VLF, ULF, ELF Transmission Sites From ?
Dubious info.? https://www.facebook.com/reel/680342785062427/?mibextid=9drbnH&s=yWDuG2&fs=e
2025-07-08 Full Restoration Of Old AM Transistor Radio
This is hard to believe. It’s a lot of work to do on a cheap AM radio. But it gives me a lot of ideas. I wonder how many hours it took to do this, we see it happening in nust a few minutes. https://www.facebook.com/restorationpretty/videos/591611740013679/?mibextid=9drbnH&s=yWDuG2&fs=e
2025-07-08 In 1929 The Superheterodyne Radios Made TRF Radios Obsolete
In the 1920s the TRF – tuned radio frequency – radios were hard to tune and their performance wasn’t very good. In 1929 the radio manufacturers started selling superheterodyne radios that had only one tuning knob, not several like the TRFs had. No more fiddling around with knobs to try to get good reception. Plus
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2025-03-16 Hot Bricks Store Heat For Use Later To Make Steam To Make Electricity
This short Ted Talk about storing heat in bricks. https://www.facebook.com/reel/2423128204690212/?mibextid=9drbnH&s=yWDuG2&fs=e
2025-02-13 What If Mexico Cut Off Trade?
The US would be in a world of hurt. https://www.facebook.com/reel/1415952769223685?mibextid=9drbnH&s=yWDuG2&fs=e
2024-11-08 RF Amp Using BD139 Power Transistors
He has a strong Aussie accent, a bit hard to understand. It’s a 28 min. YouTube video. He says BD139s have a fT of 250 MHz, but the datasheet I have does not specify any fT because the D in BD139 means they are a low frequency device, not meant for VHFs or RFs in
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2024-08-31 AM Transmitter, Low Power
This is an AM transmitter that this guy built. He says it’s rich in harmonics – it has no tuning nor low pass filtering and the stages are class C, no forward bias. It should have all the things used to minimize harmonics, like a low pass filter. Class C operation is used to maximize
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