Tag: sparc
10 May 19
7 May 19
5 May 19
Bakelite was patented on December 7, 1909. The creation of a synthetic plastic was revolutionary for its electrical non-conductivity and heat-resistant properties in electrical insulators, radio and telephone casings and such diverse products as kitchenware, jewelry, pipe stems, children’s toys, and firearms.
More at Wikipedia and more about Leo Baekeland
4 May 19
Sir Arthur C Clarke’s Wireless Communications magazine article… Click Here
Sir Arthur C Clarke …. Wikipedia
1 May 19
Allied radio, began in 1928 in Chicago Ill. Company History, Tandy Corporation Catalogs, All Allied Catalogs
30 April 19
SR-400 Production years were 1965-69
400 W PEP, 360 W CW (power input), 20-tube 80-10 Meter CW/SSB Transceiver “Cyclone”. Dual conversion receiver. Include VOX, PTT, AALC, Product detector, 1650 KHz crystal lattic filter, CW side-tone, crystal calibrator, combined R.F output & S-meter, noise blanker, RIT with a 3 KHz offset, driver tube is a 7558. External power supply.
28 April 19
27 April 19
The Russian Wood Pecker… Article on Planet Analog … Hear it on YouTube
A Great Article in “The Spectrum Monitor” February 2017, Click Here
26 April 19
The carbon pile did have more draw backs then just the RF burns, its audio was minimal and required a strong voice and obviously to be very close to the microphone…. Wikipedia …. History of the Microphone