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Fig. 7. How to add the bridge inside the radio, tected even if the mating power connector is somehow reversed at the radio. A pictorial diagram of how to make the modification inside the radio is shown in Fig. 7. Here is a step-by-step procedure:

1. Remove the red and black leads from their termination points inside the radio.

2. Connect two diodes (banded end} to the point from which you removed the red (positive) lead.

3. Connect the free end of one diode to the red lead, the free end of the other diode to the black lead.

4 Connect two diodes (unhanded end) to the point from which you removed the black lead [this may be the chassis itself),

5. Connect the free end of one diode to the red lead, the free end of the other diode to the black lead.

And there you have a very simple modification which is impossible to defeat and will positively protect your equipment. The only remaining question, it seems to me, is why this isn't the way radios are built at the factory in the first place.■

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