Offline Tool
Repeater Offset Calculator
A repeater offset is the difference between the output you listen to and the input you transmit on. Enter the output in MHz; this calculator applies the standard US 2 m (−600 kHz) or 70 cm (+5 MHz) split.
Calculate standard repeater input frequencies for 2m, 70cm, GMRS, and more. Offline offset helper. Works offline after your first visit.
A repeater offset is the difference between the output you listen to and the input you transmit on. Enter the output in MHz; this calculator applies the standard US 2 m (−600 kHz) or 70 cm (+5 MHz) split.
Two meters: most US repeaters use −600 kHz (you transmit 0.6 MHz below the listed output). Seventy centimeters: +5 MHz is the usual split. GMRS repeater pairs are also +5 MHz (467 MHz in, 462 MHz out). 1.25 m (222 MHz) often uses −1.6 MHz — W4WAU 224.160 on Holston Mountain is the East TN example (TX 114.8 / RX 141.3).
Always confirm. A handful of machines use reverse or non-standard splits. If the calculator output does not match RepeaterBook or the club page, trust the published input, not the default. Program CHIRP Frequency = output, Duplex = − or +, Offset = the MHz difference.
Related: CTCSS tones, CHIRP sheet, East TN list.
See also: Glossary: offset
The MHz difference between a repeater's output frequency (what you listen on) and input frequency (what you transmit on).
Typically +600 kHz in the US, but always confirm for your local repeater.
The radio is applying its own band-plan offset. Set duplex and offset manually to match the repeater, then save the memory.
No. National 2 m calling 146.520 MHz is simplex — duplex off, offset 0.
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