I have not done this on a 420 Micor, but I have on a 450 Micor, which is essentially the same.
As Neil pointed out, all the interstage coupling is done at 50 ohms, so you only need to decide how much power you need, and modify accordingly. The controlled stage will put out 2 to 7 watts, if you put your output there. The next stage will put out 6 to 15 watts or so. The next stage will put out 20-45 watts, and the whole thing will put out 110 watts. If you want to go for less than 10 watts out, you need to modify the power control board by changing a couple of resistors (or paralleling them on the board, which is easier). If you can get by with 10-15 watts, I would bypass the last two stages, and the radio will run cool as a cucumber, no fan needed (and draw a lot less power). Joe --- "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > I have a couple of 100-Watt, 406-420 MHz MICOR > Mobile radios. I picked them up at Dayton a few > years ago since they were very inexpensive, and > hoped that I could use them as some link radios. I'd > like to find out how to use just the low power > sections of the 100-watt mobile PA deck, as they > would be running a high duty cycle. For the distance > I'd be covering, 25 -50 watts or even much less > would be overkill. Trying to find 406-420 MHz range > 25 or 45 watt PAs to swap out has so far been > impossible, so I'm hoping someone has disabled the > last few PA deck sections to run them at lower > power, and still has some notes on how they did any > matching, etc. > Larry > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
