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Old 26th Oct 2021, 11:40 am   #13
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 18,809
Default Re: Racal Preselection & Protection unit

It's an ssb-dedicated IF filter, a proper product detector etc. There is a big improvement in audio quality and clarity. I used an RA117 for many years, with just the BFO for SSB demod, but you begin to hanker for something easier to use and clearer to listen to. In the end I never came across an SSB unit (there are several variants including ISB) so I went and bought a new ICOM IC765.
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