Yea, the dispatcher and the firetower radios were very similar and both built out of HT-200's. They were not fun to work on and the performance was a compromise.
The Motran was the first REAL radio that was solid state. The high band LLT was unpleasant and the UHF MSN could be disappointing. The low band LLT and the high band MSN were fine. But looking back on it, those radios both went thru a LOT of work to produce the power they produced! ------ Original Message ------ Received: Thu, 16 Apr 2009 11:15:36 AM PDT From: Mike Morris WA6ILQ <wa6...@gmail.com> To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Repeater information please > True. I had forgotten that one. It was a PAIN to work on as > it was positive ground internally. > > The same hardware was in the firetower repeater. > > Mike > > > At 05:11 PM 04/15/09, you wrote: > >Minor technicality - Wasn't the mobile radio that was made > >from HT-200 boards the first solid state Motorola mobile > >transmitter? > > > >------ Original Message ------ > >Received: Wed, 15 Apr 2009 01:13:47 AM PDT > >From: Mike Morris WA6ILQ <wa6...@gmail.com> > >To: Repeater-Builder@yahoogroups.com > >Subject: RE: [Repeater-Builder] Repeater information please > > > > > As to MSNs .... > > > > > > The 43MSN high band mobile was the first all solid > > > state Motorola mobile transmitter. It was the first > > > radio labeled Motran and was a direct swapout of the > > > Motrac - same cable, same head, same everything. > > > The center chassis section that held the T-supply > > > in the Motrac was all empty space. > > > > > > The 44MST came along later and was based on the > > > same basic design (and came in 4 freq and 12 freq > > > models). > > > In the 4-freq models transmit F1-F4 was in the exciter, > > > receive F1 and F2 were in the receiver chassis, the > > > receive F3 and F4 channel elements were in a corner > > > of the open center area. > > > The 12 freq was developed for the mobile telephone > > > industry and was labeled MARK XII. It was the first > > > binary switched radio in the Moto lineup. > > > It was all 12v - the open center section of the chassis > > > held the additional 18 channel elements. > > > > > > The high power 74MST was a 4 freq UHF MOTRAN > > > (and used a 28volt PA deck run by a 12-to-28 transistorized > > > switching power supply in the center section) along with > > > the receive F3 and F4 channel elements. > > > > > > To get back to the topic, his station has an M series > > > receiver, and an S series exciter that puts out about > > > 20-30w on UHF. It's loosely based on the 74MST design > > > but less the finals, I forget if the MST driver (the final of > > > his exciter) is a 12v stage or a 28v stage. > > > > > > Mike WA6ILQ > > > > > > At 10:24 PM 04/14/09, you wrote: > > > >If I am decoding the model numbers properly... > > > > > > > >The first station is most likely a 250W UHF MOTRAN base station, but has a > > > >tube in the final PA. > > > >The second station is a high-power continuous-duty 800 MHz (or possibly > >900 > > > >MHz) MICOR. (Check the channel elements for the exact freq.) > > > > > > > >Someone will correct me if I am wrong. ;-) > > > > > > > >http://www.repeater-builder.com/motorola/motorola-suffixes.html > > > > > > > >Can't help you with manual numbers off-hand, but I'm sure someone else > >will > > > >chime in. > > > > > > > >Mark - N9WYS > > > > > > > >-----Original Message----- > > > >From: Repeater-Builder@yahoogroups.com On Behalf Of bene6148 > > > >Sent: Tuesday, April 14, 2009 10:55 PM > > > >To: Repeater-Builder@yahoogroups.com > > > >Subject: [Repeater-Builder] Repeater information please > > > > > > > >I have a Motorola Motrac model #B94MSB-1106A, and a Micor model > > > >#C75RCB6105AT. I would appreciate any information on these two models as > > > >well as manual numbers. > > > > > > > > > > > > > > > > > > > >------------------------------------ > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > >------------------------------------ > > > > > > > >Yahoo! Groups Links > > > > > > >
