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G0HZU_JMR · 16th Mar 2021, 4:16 pm

Thanks! It's a few years since I last tried to use the TR4172 in impedance mode with the smith chart but at the end of the calibration the display shows the expected trace dot at the centre of the smith chart. However, this tiny dot at (50 + j0) is so insanely bright anyone would be scrambling for the intensity button and praying the CRT wasn't already burned. Luckily I was quick enough to avoid this problem.

16th Mar 2021, 4:16 pm	#125
G0HZU_JMR Dekatron Join Date: Sep 2010 Location: Cheltenham, Gloucestershire, UK. Posts: 3,077	Re: Spectrum Analyser TR4172 Thanks! It's a few years since I last tried to use the TR4172 in impedance mode with the smith chart but at the end of the calibration the display shows the expected trace dot at the centre of the smith chart. However, this tiny dot at (50 + j0) is so insanely bright anyone would be scrambling for the intensity button and praying the CRT wasn't already burned. Luckily I was quick enough to avoid this problem. __________________ Regards, Jeremy G0HZU