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G0HZU_JMR · 13th Apr 2021, 7:53 pm

Yes, on my TR4172 the marker seems to introduce some strange spiky gating effects on the display trace under certain settings. Mine has always done this and I think the spare TR4172 does it too. I'm not sure if it is a fault but it doesn't look good when it happens.

Your calibration results look a lot more consistent than mine for the narrow RBW settings. I keep meaning to adjust the 7Hz and 10Hz RBW filters in mine. I usually see error corrections of 2.5dB for the 7Hz RBW for example.

13th Apr 2021, 7:53 pm	#169
G0HZU_JMR Dekatron Join Date: Sep 2010 Location: Cheltenham, Gloucestershire, UK. Posts: 3,077	Re: Spectrum Analyser TR4172 Yes, on my TR4172 the marker seems to introduce some strange spiky gating effects on the display trace under certain settings. Mine has always done this and I think the spare TR4172 does it too. I'm not sure if it is a fault but it doesn't look good when it happens. Your calibration results look a lot more consistent than mine for the narrow RBW settings. I keep meaning to adjust the 7Hz and 10Hz RBW filters in mine. I usually see error corrections of 2.5dB for the 7Hz RBW for example. __________________ Regards, Jeremy G0HZU