Neil McKie wrote: > I think the politics with that was after the bad name GE had made for > themselves with the Transistorized Progress Line (TPL) the Mastr Pro showed > the county shop guys all was not lost. I know, I was impressed. >
This subject is touched upon on this page: http://www.gemoto.com/FM.htm Notwithstanding my (slight) favoritism toward the Motorola line, the GE Mastr Progress Line Professional (Mastr Pro) Mobile was my very first repeater project in the fall of 1978; I was 14 years old. The ER-41-C receiver works so well. This receiver, despite having a sensitivity of about .5 uV (-113 dBm) when pulled into the ham band, will out hear many others. Someone a while back bitched about how difficult it is to change out the helical resonators in a Micor, they obviously never did a Mastr Pro high band..... I never cared for the switching power supply design in the Pro's mobile, and it was very hard to reduce/eliminate the whine from the repeat audio when you duplexed one. I'd have to find my notes as to what I did, but a significant improvement could be had. The mobile power supply was never intended for the duty cycle of a repeater, and I often wondered when it would burn up. The tube multiplier and final made it an easy chore to get it to duplex, even with a modest duplexer. If one was so inclined, they would rip out the switcher and build a nice line powered supply. This made a nice sounding - more reliable repeater, but eliminated the easy battery back-up. The Mastr Pro was a great improvement over the TPL, and was likely GE's saving grace. Kevin Custer Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
