Dubious info.? https://www.facebook.com/reel/680342785062427/?mibextid=9drbnH&s=yWDuG2&fs=e
Archive for the ‘antenna’ Category:
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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2024-04-10 FM Regenerative Receiver Using MPF102 JFET
A basic one transistor regen receiver uses an MPF102 JFET to give the regenerative gain. Also uses two transistors to amplify the audio to drive an earphone. https://www.circuitbasics.com/what-are-fm-receivers/
2024-03-29 FM Crystal Set Uses Helical Resonator For Tuning
This is a long article but a very interesting project. It uses HSMS-2850 Schottky detector diodes in a discriminator. He uses WE 1200 ohm sound powered headphones. He’s Canadian. https://electronbunker.ca/eb/FMCrystalSet.html
2023-07-16 26H20 Radar Repair At Ft. Monmouth, NJ
In 1966 I completed basic training and went to Ft. Monmouth, NJ for 10 months of Radar repair training. The last half of the course we got to work on the actual Radars in *that* barn-like building in the photo. I was on the graveyard shift. There were birds flying around up in the rafters
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2023-07-09 Groundbreaking Research Transmits Energy From Space To Earth
This is definitely groundbreaking. But I don’t understand why they’re doing it this way. I think the array that’s in space should be as simple as possible – an array made up of thin sheets of metallized mylar that reflect the sunlight to the photovoltaic array on Earth. In their system and mine, there has
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2021-11-11 Starlink Antennas Changed To Square
The newer Starlink antennas have been changed from round to square – or actually they look rectangular. This would give more antenna surface for a given cubic shipping container. Might be easier to manufacture, too. Some British guy said that they had satellite TV ‘aerials’ back in the ’90s and they called them squarials. But
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