Midland
79-290
Documentation Project
CBTricks.com
Expanded Frequency Modification
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1.
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Remove from unit. |
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2.
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Remove the top and bottom covers. |
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3.
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Remove the control head from the unit. The modification will be done inside the control head. |
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4.
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Remove the back cover from the control head by removing the four small screws. |
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5.
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Refer to the drawing above and make the two solder connections as shown. The two solder connection at the top of the PCB may already be installed. |
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6.
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Reassemble the control head. Using a jumper wire short pins 1 and 6 as indicated on the back of the control head to reset the microprocessor, remove the jumper. |
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7.
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Test the unit for proper operation. |
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8.
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To Access the Expanded Mode of Operation. A. To select 240 channel operation, turn the unit off . hold the "DW" and "CH9" buttons while turning the unit on. You should now see a "D" in the channel display. Pressing the "CH19" Button will cause the unit to cycle from bands "A" through "F" , with band "D" being the normal CB channels. B. To select
the HAM band with high power turn the unit off. Press the "LCR"and
"MIC" buttons while turning the unit on. Release the
buttons and 28.000 should be shown in the display. 170 channels from
28.000 to 29.700 can now be selected with the channel selector. Optimum
performance on the HAM band may require realignment of the trnsmitter
and receiver. To return to normal
operation, reverse the above procedure. If power is lost to the control
head or if tile microprocessor is reset the above functions will have
to be reentered. |
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Disclaimer: Although the greatest care has been taken while compiling these documents,
we cannot guarantee that the instructions will work on every radio presented.