Kenwood TH-25A Instruction Manual

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KENWOOD TH-25AT Radio ModificationEXPANDED RF~~~~~~~~~~~~~~~1- Disconnect the power and antenna.2- Remove the volume, squelch and tuning control knobs3- Remove the nuts from the volume control and tuning controls.4- Remove screw located by the PTT switch.5- Remove screw by the speaker jack6- Remove two screws from the battery plate.7- Carefully pull the front panel from the radio. Do not break any wires.8- Gently lift top panel from the radio by pulling it toward and thenupwards. The O ring on the BNC connector will cause some tension.9- Rotate the top panel towards the front of the radio to expose the75" x 75" board.10- Remove chip resistor R19, R20, R21.11- Reassemble the radio.12- RESET the CPU. Hold down [M] and turn power ON.TH-25AT MARS/CAP modificationThe following modifications will allow the TH-25AT to transmit from 141.000 to 162.995 MHz.Specifications are guaranteed for the Amateur band only. The transceiver may require realignment of thePLL circuits.Disconnect battery pack and antenna.Remove the volume, squelch and tuning control knobs by pulling them straight up from the toppanel.Using a 7mm spanner wrench, remove the nut from the volume control and the nut from the tuningcontrol.Remove one screw from the back of the radio, by the PTT switch.Remove one screw near the speaker jack.Remove two screws from the battery terminal plate:6.5.4.3.2.1.Page 1