Verify that you have the correct voltages as Kevin suggested. The Micor uses a tripler amplifier and if it has a low output it will not key the PA. To verify that it. Look on the front of the Micor shelf disconnect the left RF cable coming from Pa (output of the Tripler). Connect a wattmeter with a dummy load to the BNC connector of the Tripler (not the PA cable). You should see 1-2 watts when you key the transmitter from the station control. If not check the voltage going to the tripler should be 12volts. You can check the exciter by removing the tripler and plugging a wattmeter in its place (1st band pass filter). Verify that you have RF there. This will be in the VHF range about a 1/2 watt or so. Do not rely on the fact that you can hear the exciter on your handheld. If you have RF at the exciter and nothing at the output of the Tripler and you haven't changed the original FREQ then you guess it the Tripler has gone south. You must be very careful with these Triplers to insu re you all ways have a load on the output i.e.: PA or dummy load. The Tripler can be repaired see the Repeater-Builders Web site. You can check the output of the Tripler stages by connecting a wattmeter or using RF probe on your voltmeter to check the different stages of the tripler. I've repair a couple of the Micor Triplers and they come back up and work fine.
Good luck
Mike
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