Hello Is there a definition of what an S unit is. I am building a home brew receiver and I don't know what to calibrate the meter to. gerry k6txd ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org