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The 1S2 was [[introduced in 1967]] and was sold through 1971 or 1972. | The 1S2 was [[introduced in 1967]] and was sold through 1971 or 1972. | ||
* [http://w140.com/kurt/tek_1s2_sn1990-up.pdf 1S2 manual] | * [http://w140.com/kurt/tek_1s2_sn1990-up.pdf 1S2 manual (PDF, sn 1990 and up)] | ||
* [http://www.pa4tim.nl/wp-content/uploads/2012/01/1S2calibrationPA4TIM.pdf 1S2 Calibration Guide by Fred Schneider, PA4TIM] | |||
* [http://www.pa4tim.nl/?p=3016 1S2 Page on the Website of Fred Schneider, PA4TIM] | |||
==References== | ==References== | ||