A short video on a small repair I did to a previously reliable QRP antenna coupler.
There's a few lessons in this.
Most notable is that components can sometimes partially fail and become intermittent. Such faults can't necessarily be picked up by simple multimeter tests that would otherwise suffice most of the time.
Also it's worth rethinking the use of small RF chokes as inductors even in QRP antenna couplers if you're using them to run continuous duty cycle digital modes as I believe it was them that caused the fault. Possible substitutes include going back to iron powder toroids like the T50-2 or T50-6.
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