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R&S Cryptic Acronyms
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RBBVNL9:

--- Quote ---The cognate in technical English, "wavemeter" or "absorption wavemeter", is an obsolescent test device comprising a solenoid in parallel with a variable capacitor, where the capacitor dial is calibrated in the resonant frequency.
--- End quote ---

This comes actually pretty close. The WAM and WAL use different principles (an LC circuit and a Tuneable λ/4 line tuned cavity, respectively). And both methods are obsolete, I'd say ;-)

I made a video reviewing them both and repairing one of them: https://youtu.be/EuDcRPdHJE0
 
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