thank you for the useful info! i guess i can make my own vehicular repeater from two spectras and a portable duplexer...thank you very much!
--- In Repeater-Builder@yahoogroups.com, "skipp025" <skipp...@...> wrote: > > > > Re: what pac-rt means > > > "George" <gueorgui@> wrote: > > thank you! that means that the setup has no repeater > > device built in. just a switch that enables external > > repeater (different device) > > Yes, and in some cases the switch is an option on the > main radio, Convertacom or via a plane-jane switch mounted > on a panel. The actual extender (repeater) lives in the > trunk or under the seat near the main radio chassis (unless > you have a dash mount radio). The extender hardware is > most often within 6 to 8 feet of the main radio chassis, > where ever it is... > > And the extender - vehicle repeater is not a true duplex > stand alone box. The extender is actually just a specialized > half duplex (normal) transceiver, when connected to the "main > radio" operates with... in duplex operation. And the > resultant duplex (repeat) is from both the extender and main > radio (and can be the same or cross band). > > In the early days... > T'was hard for many mfgrs to make an in-band (same band) > extender work well with some difficult frequency parings. > Using different frequency ranges ("bands") for the extender > solves/solved a lot of the in-band desense issues. > > But in-band extenders work very well if you have the right > frequency spacing and RF Cavity Filtering (protection) in > place. > > s. >