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Old 28th Nov 2017, 8:23 am   #6
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,801
Default Re: Directional coupler - terminated and unterminated

I know my way around HP analysers much more than Tek, and theirs with LO outputs rather firmly state that terminations must be fitted when they're not in use.

Economy models like the 8558 plug-in analyser had no tuning stabiliser and a free-running cavity oscillator for the 2nd LO. Better ones had samplers on the YIG and VCXO-multiplier chains for LO2.

David
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