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Old 27th Jun 2022, 2:43 pm   #186
Alan Bain
Join Date: Jan 2012
Location: Amersham, Buckinghamshire, UK.
Posts: 25
Default Re: Spectrum Analyser TR4172

After testing further I've noticed that the directional coupler is terminated in 50ohm on input side but measures about 600ohms looking back from C1. While I don't have any values any design for such a coupler that I have seen has had both ports terminated equally. Fortunately I have some precision 0402 50ohm terminating resistors, but does anyone have any ideas of a flux that allows the gold to be wetted?
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