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We must remember that CB radios are high level modulated in the driver and final RF stages. Long after the IF strip where crystal and ceramic filters are used. Therefore these filters have no impact on the TX bandwidth like they do in a low level IF modulated HF rig. The filters would only be affecting the upper end of the bandwidth anyhow with no effect on the AM bass. All of the TX bandwidth is determined by the value of capacitors used in four AF stages on the 8719 board..