EV> RW> I remember having some tube-type Motorola VHF mobile radios   
   EV> RW> that I thought were too large to put in a car. They were run by   
   EV> RW> remote control with 99% of the radio mounted in the trunk and   
   EV> RW> you only had a control head and mic under the dash...   
      
   EV>You're talking about those Two Way Radios used in Police Cars, Fire   
   EV>Trucks, City Works, Taxi Cabs, etc...   
      
   Adn they were popular ot convert inot Ham units. Lots odf them were used   
   for repeaters because of their low price on the used market as compaired   
   to a Ham Repeater unit of the3 same power output   
      
      
   EV> RW> The Motorolas I mentioned above had two sets of crystals in   
   EV> RW> them. One that received the base station and one that   
   EV> RW> transmitted on another frequency, presumably the base station's   
   EV> RW> receiver, aka duplex. They had a couple of channels setup like   
   EV> RW> that and about 4 channels with simplex frequencies in their rx   
   EV> RW> and tx. That was late 50s or early 60s.   
      
   EV>A and B Channels? and they're not Duplex, they are Simplex Push To Talk   
   EV>Radios.   
   EV>Unless you got something from Motorola fancier than the usual Mobile   
   EV>Radio the Services above used in the 1960's when I was a Dispatcher   
   EV>for City Works.   
      
   Back in the Xtal day it was the only wat to go for multi channel   
   operation. Typical the two frequency units were Dispatch and Tactical   
      
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