At 01:18 PM 01/30/07, you wrote: >Mike Morris WA6ILQ wrote: > > 4freq 220 (2m Motran modified) > > and 6freq 440. > > > > Mike WA6ILQ > >I think you mentioned that once before-it'd be interesting if there was >an article for that...I have a Motran in the garage with a M-70 DTMF >head and a GLB for it...have to change the offset oscillator-it was the >smaller one with one row of knobs and offset switches...
If you have the manual for that baby GLB I'd like a copy. The receiver conversion was basically the same steps as Kevins one for the Micor. Trim the helicals to resonance and convert the 70-140mhz doubler in the multiplier chain to a tripler. I remember that I was able to use a CAP receive element to hear my sig gen on a frequency in or near 220. The transmitter conversion was even easier. The tuned circuits in the last doubler collector and through the final were three pieces all in parallel: a coil, a fixed cap and a variable cap. The simple way but the least vibration stable was to chop out the fixed cap and retune. I got about 20 watts out of a 30w radio. I never went any further as I was doing it to prove a point, but the right way would have been to trim the coils and swap the caps for smaller values to maintain a proper LC ratio. But it worked, and I used it for a while as a base and as a mobile. It was fun to be in a conversation with a bunch of folks that all had 13-509s and say in passing that I was running a 4-freq Motran... it was a real conversation piece. I never got around to it but I was going to take a blank Motrac/Motran serial tag (you could get those for a while as an orderable spare part, and I have exactly one left) and have it engraved as a "U43 1/2 MSN-3190AK-SP-WA6ILQ" For those readers that don't get the joke, a U43 was high band and a U44 was UHF, so naturally a U43 1/2 would have to be 220... and a trailing SP-something was a custom factory mod of a radio. Usually the SP was a number, like SP-103 and a SP-callsign would be a really unique SP... Mike WA6ILQ
