Cobra 2000 GTL Modifications

Cobra 2000 GTL Modifications. Every other CB radio I have seen with extras has been by digital means on the PLL. This one was different as the PLL is locked in this model. Usually it gets replaced with an modifiable version PLL but this had a Switched Chrystal Bank of 11 Mhz values with two wires going back to the original Xtal position.

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DUAL DDRR C0-Phased Citizens Band HF Antenna Array

In layman’s terms a DDRR is just a short vertical monopole (vertical post) attached to a transmission line tuned by a reactance (ring plus vacuum capacitor). The reactance of the capacitor is transformed by the transmission line and will under specific conditions (length, value of the capacitor, etc.) make the vertical post resonant. Slight variations of the capacitor will lengthen or make the transmission line “shorter” and allow tuning of the antenna on a certain range.

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