Cobra
200GTL DX
Documentation Project
CBTricks.com
Frequency Conversion
For a printable mod sheet
go here
NOTE:
Exercise a great deal of care with this mod!
Due to the placement, size, and close proximity of the surrounding traces.
If done wrong you could destroy the PCB and / or the transistors.
If you have even the slightest doubts or the proper equipment, it would be wise
to have someone
else you trust perform the mod for you.
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1.
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Remove power from the radio. |
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2.
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Remove the covers and locate the TMP87PP21DF Microprocessor near the front right of the unit. |
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3.
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Locate
and Remove the surface mount Resistor R138 to the left side of the Microprocessor
this will let the radio TX on all the channels but the “Government Frequency” range which is Listen Only!. |
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4.
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Resistor R619 controls the TX on the “Government Frequency” range and is not installed from the factory. Install the resistor that you removed from R138 to the R619 pads. (1k) to activate the “Government Frequency” range. |
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5.
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Remove
Power from the radio by disconnecting the Power leads for 15 seconds to
reset the Microprocessor. |
Disclaimer: Although the greatest care has been taken while compiling these documents,
we cannot guarantee that the instructions will work on every radio presented.