Kenwood R-1000

I've made a few modifications to my R-1000.

Link to large image First change was to add a jack for a +12V input, since I wasn't willing to pay the high price for a factory mod. Image shows the connection point on the power supply board. I wired a 1N4001 diode in series with the wire to the added connector to protect against reversed polarity. The cathode of the diode is soldered to a point on the PS board near the connector the real external power connector would be plugged in. The anode of the diode goes to the white wire shown. A hole was drilled in the black plastic covering the external power supply connector chassis cutout and coaxial power connector installed. The center pin of the connector goes to the other end of the white wire, and the connector barrel wired to chassis ground.

Link to large image Twice within the last year, I had to replace all the front panel lamps. The S-meter lamp is accessed by removing the front panel, pulling out the meter, and removing the bracket behind it. My replacement bulbs were from Radio Shack, rated at 12 volts, but the voltage to the lamps was a little over 14 V. The bracket is seen in the lower right corner of the photo.

Link to large image This closeup of the S-meter lamp bracket shows the 82 ohm resistor I wired in series with the lamp. This reduces the voltage to the lamp, and greatly reduces the current surge when the radio is turned on. The starting surge when the lamp filament is cold and a low resistance is when lamps usually die. A similar resistor was wired in series with the lamp behind the Frequency dial.

Link to large image The mode switch was replaced with green LED's. Four LED's were wired in series, along with a 470 ohm resistor, and mounted on the mode switch reflector bracket so as to shine on each of the mode switch pushbuttons. The LED's are held in place with hot melt glue. Works well, but perhaps not worth the trouble. Most LED's emit light in a narrow cone, so I didn't change the meter or frequency dial to LED's. LED's on those would likely have resulted in small circles of light in the center of the meter or dial rather than even illumination.

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Copyright © 2004 John Kolb Last revised Jan. 27, 2004