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Operating manual for National NCX-5 transceiver in pdf format. Compliments of Mike Sullivan, KC2KJ. Customer Service Bulletin CSB 66-1. Compliments of Gregory Mijal, WA7LYO.
The following bulletin was produced by National and intended for the National NCX 5 transceiver. The customer Service bulletin is CSB 66 - 1 An additional modification to the NCX 5 transceiver: Low AM receive audio level/ SSB audio level normal Change L22 inductor at diode D11 (am detector) from the single layer unit supplied to a larger inductance. A small 3 section choke works well. This will raise the received am audio and prevent the operator from having to reset the volume control when changing receive modes. Compliments of WA7LYO