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Cobra 200GTL: Receiver overload and TX warble | Radioaficion Ham Radio

Cobra 200GTL: Receiver overload and TX warble

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Cobra 200GTL

Receiver overloads when receiving a strong signal, resulting in distorted audio.

In addition there may be a warble in the modulation when transmitting (which might be described as a popping sound during transmit).

ACTION: RF is bleeding into the receiver front-end. Apply the following fix:

Install a 1uF electrolytic capacitor across C607. (From C607 to ground)

1uF electrolytic capacitor: Cobra part number 020-007

ADJUSTMENTS: None.

NOTES: When receiving very strong signals, it still may be necessary to turn down the RF Gain.


Cobra 200GTL Receiver overloads when receiving a strong signal, resulting in distorted audio.

Scrape to expose the circuit traces as indicated above. The large copper area is ground.

Cobra 200GTL Receiver overloads when receiving a strong signal, resulting in distorted audio.

Solder the capacitor as shown. Be sure to observe polarity. Put some glue under the capacitor so that it cannot move.

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