Make sure your SWR is as low as possible. you might invest in a modulation meter as well. the person that posted before me is correct, a "power" mic could help but the best way and most effective way is low SWRs.
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Re: superstar 121 ranger radio
Hello...the best way without making internal adjustments...is to use an amplifier microphone...maybe a turner style mike hand or base...there is just a connector soldeing job and is usally an instruction for what pins to connect for your radio...it is often no adjustment internally in your radio that is good becauie it can give the result of splatter and over modulation...good luck Ron
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first if must be adjusted for deadkey to be lowered down from 1-4watts as not to hurt the amplifier, then connect a small jumper to the amp, run heavy gauge wires to a good power source hopefully the battery.. just use a relay to switch on/off w/key/stereo circuit to turn main power off the the amp. if need too. Also the SWR's must be low have them checked. Free @ any Good Radio Shop.
Some people say cut off or jump the mod regulator on the circuit board. It would be better to get the specs on the circuit and using a small to screw driver (with power off) to turn it up counter clockwise all the way. It is factory set at 50 to 90% modulation. I would not turn it up all the way unless the radio has a mic power output adjustment on the panel. This way if you go "over mod" you can cut back the power. Many "S" meters will also show modulation so you can see if it is too high (into the red). Check for response to modulation before starting to see if it reads modulation. Afterwords to check, key the mic without making any sounds and see where the meter sits. Then whistle into the mic to see the meter moves up. If nothing happens it could be: 1) the "S" meter does not show modulation, or 2) you turned the adjustment in the wrong direction. If no one answers your calls it would be #2.
To increase modulation you want to change R142 and R174 to 10 K Ohms. You
Modulation boost: Change R142 and R174 to 10k ohms.You can clip d80 for talkback. Now for the power, look in the radio towards the back. You see the pot with the ferrite in it right behind c144 - it might have some glue in it. Gently scrape that glue out of there with a plastic screwdriver. Now unscrew that ferrite clear out. Those will be your main adjustments you can do without a scope.