Bill, The UHF Micor receivers are pretty much standard in all Micor radios. Probably cheapest and best place to look is for a mobile which can be had on e-bay for $10 plus $100 shipping. The receiver is a simple remove (it unplugs), insert in your repeater and tune.
If you could talk the e-bay seller into removing the receiver and shipping it only he might reduce the shipping to $90 (shipping $10, handling $80). I am not sure if you are using a mobile converted to a repeater or a full real live Micor repeater. In the live one the TXs are radically different so the mobile TX parts will not do you much good unless you would like to go thru the pain of removing a PA, hi. 73, ron, n9ee/r >From: William Delbert Ellis <[EMAIL PROTECTED]> >Date: 2007/09/01 Sat AM 10:14:59 CDT >To: [email protected] >Subject: [Repeater-Builder] Micor UHF RX IC needed M6707 > >Howdy fellow repeater builders. >My Micor UHF ham band repeater has gone deaf. >Basic troubleshooting reveals no discriminator output >When I hang a scope on the input to the 2nd IF amplifier everything >looks great. I can key up my FT-817 on the machine's input frequency >and see a nice signal with deviation as I talk. Switching to another >repeater frequency on the FT-817 I get nothing so I'm sure the >Channel element, mixer all the doubler circuits and all the other IF >stages and crystal filter stages are ok. The output of U102 the 2nd >IF Amplifer M6707 IC has nothing. I pulled one end of C192 the end >that goes to L137 from the output of the AMP. This is easy because >it's mounted dead bug on the back of the PCB. Still no output from >the AMP. I did this to make sure no other circuitry down the line >was holding down the output of the AMP. So I think the four diodes >in the discriminator are OK. When the machine is cold and been >powered down for 30 minutes or so the amp seems to work for about 5- >8 seconds when first powered up then shuts down so I'm pretty sure >this IC is bad. >The questions are: >A. Is this a common problem? >B. Where can I find a replacement? >C. Is there a new device that can be used in it's place? It's in a 9 >pin round package. >D. Shoud I look for an old mobile UHF Micor and remove the part? >Thank You group and have a nice Labor Day weekend. >Bill N5ZTW > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
