Here’s a balanced review of common modifications for the (typically the 3900, 3900E, or 3900G board versions, often built by Ranger or similar to the Galaxy/Connex platforms).

The Super Star 3900 is a legendary CB transceiver known for its "DX chassis" design, bearing a strong resemblance to the classic Cobra 148GTL

Many operators find the standard "beep" at the end of transmissions annoying. Copper Talk: Remove Superstar 3900 Roger beep

Locate the black plastic plug ( CN5 ) in the front center near the gold crystal. Moving this plug to the next slot typically enables the extra bands.

The Superstar 3900 is a classic AM/FM/SSB export radio. Stock, it’s decent but benefits from several mods to improve performance, particularly on SSB.