It is possible to search the Amsat-BB archives by using the "site:" command in Google.

For example, to find all mentions of the word "Diplexer" in amsat-BB, type this line into Google:

Diplexer site:http://amsat.org/pipermail/amsat-bb

To restrict the search to a particular year, type: Diplexer site:http://amsat.org/pipermail/amsat-bb/2014

The 'site' command is also applicable to the AMSAT News Service archives at: https://amsat.org/pipermail/ans/

(via Dan Schultz N8FGV, posted in ANS-267 bulletins, September 24, 2017)