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First of all,what model Astatic meter do you have,model number?

You hookup the radio you are testing to the plug on the Astatic labeled,'radio'. with a coax jumper with two PL-259 connectors,one at each end. You then plug your antenna coax into the plug on the Astatic swr/power labeled,'antenna'. Turn radio on,follow instructions that come with the Astatic meter. Select the power scale and correct wattage and key down. Observe what the Astatic is showing on the meter. Make sure the Astatic meter is switched to show power and not swr. Talk or even whistle or say,"Aaaaauuuudddiioooo' into the mic while you are keyed up and see if the meter on the Astatic is swinging from it's dead key reading to a higher wattage reading. That's how you tell if you've got modulation. Still,using another radio close by to hear yourself talk is a good idea too. Just make sure everything is hooked up properly so you won't burn anything inside up.