Haven’t seen a Texscan box since the mid70’s! As I recall, they were in Indy, and JFW is also, so could have been purchased and renamed. Anyway, it sounds Ike there are three terminals for each section, with the one showing the dB value being the common. Seems like the hard way to do it, that is, needing both pos and beg supplies. Might have been a customer driven thing. If JFW has a similar scheme, then there’s your answer. From Tom Holmes, N8ZM From Tom Holmes, N8ZM > On Jun 6, 2024, at 6:47 PM, skipp isaham via time-nuts <time-nuts@lists.febo.com> wrote: > >  > Hello Time-Nuts Group, > > I received a donated Texscan Programmable Attenuator, Model PA-51 style this one with Female N-connectors. It's a nice looking unit and I'm not able to find much in the docs department. Even a search for Texscan doesn't seem to turn up much, they might be out of business these days(?). > > I'm hoping someone would at least be able to give me the basic information of how to control the attenuation steps. > > The attenuator box itself, has a pair of feed-through capacitors per each box marked attenuation value, one feed-through has a + the match has - .Logic suggests some applied potential/current to a pair of pins turns on or off the corresponding attenuation value. > > Would someone be able to please describe the expected control values/ methods for this Texscan Programmable Attenutator. Through the Group here or Email direct, what ever is best. Actually having an original data or instruction sheet would be wonderful, but I can and will try to work with whatever information I receive. > > Used / surplus Texscan products seem to "be around", a number of different physical format attenuation products turn up at on line auction (Ebay). In addition to the PA-51 series (aka PA-5x...), a few models that look like the JFW rotary equivalents are also listed at auction. Might Texscan be or have been a company simply putting their label on other mfgrs products? > > If I can get my head around how to control this PA-51, I can certainly use it for my automated pre-amplifier evaluations. Thank you in advance for any replies. > > Regards, > > Skipp > skipp025@yahoo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com