Hmmm, never heard of Callan, certainly heard of HP and Agilent though. Wavetek, Sadelco and Avantek were the names associated with installer meters and field test. HP now Agilent made mostly high end gear not really suited for the specialized CATV industry. We did have an HP spectrum analyzer and a TDR which of course were top notch.
The only one left that makes this gear is Sadelco although Sencore and maybe a couple of others are new to the market. I have no experience wit them but Sencore looks pretty good too.
-Hal
