Back in the late sixties, Bendix Radio ??, came out with a trunk mount radio. The receiver (I think) looked very similar to the Motorola Twin-V Line of the era. The transmitter looked like the GE Progress Line transmitter deck. Both the receiver and the transmitter used a cable to plug into the power supply almost exactly like GE did in the Pregress Line.
Neil Paul Finch wrote: > > OK, > Here goes. There is always going to be some similarities in radio > equipment because of the current existing technology. Look at the > similarity between the cell phones out today that are built by > different companies, are they all stealing each other's designs? I > don't think so! > > Read my response> below. > > -----Original Message----- > From: Kevin Custer [mailto:[EMAIL PROTECTED] > Sent: Monday, December 01, 2003 1:10 AM > To: [email protected] > Subject: Re: [Repeater-Builder] GE Stuff..... > > Paul Finch wrote: > > >Kevin, > > > >Explain please! The only thing I see is the TCXO's that are even > >anywhere close. > > > > Similarities in Mobiles: > Control Head. > > Response> Motorola white and grey and squared corners, GE Beige and > tan and rounded corners. Everybody had gone plastic at that time > due to cost. Real close! > > PL (Channel Guard). > Response> This was an industry standard CTCSS, how can that be copied > by GE? Every radio manufacture used this format, guess they all copied > Motorola? Motorola called it Private Line, GE Channel Guard, RCA and > Johnson something else. One other thing, if I am not mistaken this > technology went back to the days of the old Motorola 80-D and GE > Pre-Progress line of radios but they all put their own name on this > technology. All used the EIA tone scheme ... only Motorola called each tone a specific designator. Ie: 1Z for 100.0 Hz; 1A for 103.5 Hz etc. > RF Power Output Options (Like 110 watts). > > Response> Again, industry standard, GE, Motorola, RCA, Aerotron and > Kenwood all had and still have that power level, that is if they are > still in business. As someone else pointed out a lot of this was > driven by the industries like police and fire departments that were > specifying the equipment. > > AF Power Output (10 watts) > > Response> Big deal, this is the best level for use in noisy environments > like large trucks! > > Channelized Crystal Elements. > > Response> Like I said, this is the only real thing I can see that is > similar but still not really the same circuit! > > 5 Pole HR in a casting that is not soldered to the PC board. > Response> This style of helical resonator is the best for selectivity, > I think the noisy cities we live in drove this design. Johnson, RCA > 1000 and other serious manufactures also used this number of helical > resonators, did they copy Motorola? (RCA did copy the Master II and > paid big time!) > > Dual Hysteresis Squelch. > > Response> May have gotten the idea from Motorola but did not copy the > circuit. > > Single Conversion Receiver, with 11 meg I-F frequency. > > Response> GE's was 21.4 I believe and this was driven by cost as must > as anything else, it's just cheaper and some people think it keeps down > intermod. > > Same number of I-F poles. > > Response> Physics, that's just what it takes to have the required > selectivity. > > Stable RF/AF circuitry operates on 10 volts (9.6 on the Micor) > > Response> GE's Master Pro ran their circuits on regulated 10 volts long > before Micor came out! > > PA Protection (VSWR). > > Response> Yeah, they copied Motorola's protection circuit that only > caused more problems in the radio, I don't think GE had a SWR > protection circuit, at least I never had to work on one, I worked on > a lot of Motorola protection circuits. GE did have power control. > > Receiver Sensitivity. > > Response> How can that be copied???? Technology improved letting > everyone improve receiver sensitivity! > > Preamp is an option. > > Response> Everybody had that option! Guess they all copied it! > > Frequency Ranges (Like 150.8 mc.) > > Response> I have no idea what you are getting at here, the frequency > ranges were/are set by the FCC, not Motorola! If you mean the > frequency bands the radios covered, again physics have more to do with > it than Motorola or GE and those bands go back in some form for as > long as radios have been around. > > Size. > > Response> Right, while the overall footprint is close (but no cigar) > the height of the GE radio is a 1/2 inch less than the height of the > Micor, where is the similarity? Motorola-Charcoal grey, GE-Beige. > GE Length 19.0 Width 11.75 Height 2.5 Total 558.125 cubic inches > Micor Length 17.625 Width 13.0 Height 3.0 Total 687.375 cubic inches > You do the math.... > > Weight. > > Response> GE 25 pounds. Micor 26 pounds. This is with mounting plates. > GE's is very heavy metal plate and the Micor is a thin stamped plate. > It's obvious that the actual GE radio weighs less than the Micor since > the plates are so different. > > Gee, there are hardly any similarities now that I look at it..... > Get real...... > > Kevin Custer > > Response> Gee, lets keep this up, I am having a lot of fun while > bringing back some great memories! What this comes down to is you > think Motorola developed all the good radio technology, simply not > true! I have worked on both, I like both but prefer the GE radios. > Show me an actual circuit that is similar, that's what counts! Some > things like PA's and oscillators are so generic there is only one way > to design them but there is a lot of differences between the Master II > and Micor radios. If Motorola truly thought GE copied their design > Motorola would have been all over GE, just like GE got all over RCA! > > In conclusion, Master II had a completely different case and different > color, Micor had their transmitter on one side, the receiver on the > other. GE had their exciter on the left front, receiver in center and > audio on right front, helical resonators near the center back with the > PA and heat sink in the very back, yeah very similar! Look at the RCA > copy of the Master II if you want to see true "copy". > > Like you said, get real! > Paul > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
