How to Do a Modification on an RCI 2950

Written by simon foden Google
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How to Do a Modification on an RCI 2950
Replace circuit resistors to attenuate current flow in the microprocessor. (Jupiterimages/Photos.com/Getty Images)

The RCI 2950 is a "10 meter" ham radio transceiver manufactured by Ranger Communications, Inc. The chief application of this device is as a broadcast transceiver used on the 28000 to 29700 kHz frequency range. The RCI 2950 contains a microprocessor. In a review of the RCI 2950 published online, the communications company Pen Tele Data asserts that this particular transceiver has a microprocessor that is relatively easy to modify.

Skill level:
Moderately Challenging

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Things you need

  • Wiring schematic
  • Coloured markers
  • Phillips-head screwdriver
  • Sponge
  • Soldering iron
  • Solder
  • Wire
  • 6.8k resistor

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Instructions

  1. 1

    Turn off the RCI 2950 and remove the plug from the main. Allow it to cool for ten minutes.

  2. 2

    Study the RCI 2950 wiring schematic which illustrates the layout and relationship between the various transistors, processors and relay coils on the circuit. If you don't have the original schematic, download a copy from the "CB Tricks" website listed in the References section below.

  3. 3

    Dismantle the chassis enclosure. Remove the screws from the back panel and lid to expose the wiring and circuit board. The microprocessor is located on the circuit board.

  4. 4

    Identify the components and functions that you want to modify. For example, to permanently close the clarifier circuit, identify the resistor marked "R-197". Locate it on the wiring schematic and use a coloured marked pen to highlight it. Find the resistor on the board and mark it with the same pen. Repeat this colour-coding process for all relevant parts that you intend to remove or modify.

  5. 5

    Remove the "R-197" resistor by melting the solder joint fastening it to the circuit board. Wipe away any solder residue. Pull the resistor out of the turret on the circuit board, and clean the turret with the dry sponge. Solder a wire into the pin socket inside the turret and connect the other end to "Pin 3" on the circuit marked "IC6". Remove the capacitor marked "D-78".

    How to Do a Modification on an RCI 2950
    Never touch the tip of the soldering iron when it is on. (Comstock/Comstock/Getty Images)
  6. 6

    Replace the existing 2.2k resistor "R-78" with a 6.8k resistor. This modification is for fixing intermittent power shutdowns on the RCI 2959. By increasing the resistance in that position in the circuit, you reduce the risk of power overload, the primary cause of these shutdowns.

  7. 7

    Reassemble the chassis enclosure. Once you have completed your modifications, check that all wires are firmly soldered into place and that all resistors are fully connected. Screw on the back and top panels to enclose the chassis.

Tips and warnings

  • Put the chassis screws on a piece of electrical tape to prevent them from rolling away.
  • Clean the soldering iron tip before removing resistors. If there is solder residue on the tip you will actually strengthen the solder joint you are trying to break.

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