It means the local oscillator crystal is coded Green indicating its thermal characteristics. You can read about it here: http://www.wb4hfn.com/DRAKE/DrakeArticles/CrystalCodes.htm 73, Chris, W2PA Dan Cotsirilos K9DTC wrote: > I have a T-4XB with a serial #15359 G. Does anyone know what the "G" means? > > > Dan K9DTC >