Lathem ATX - Manual (Page 5)

ATX Installation and User’s Guide
Page 3
AirTime wall clocks and ATX Repeaters. The WWVB signal strength
indicator
indicates the strength of the WWVB signal being
received. The ATX ideally should be placed near a window facing
Boulder, Colorado or under a skylight with a clear view of the sky for best
signal reception. In Master mode, the ATX can also be set manually if no
WWVB signal is available. The accuracy of the ATX without the WWVB
signal is +/- 5 minutes per year. Note: If the ATX (in Master Mode) does
not receive the WWVB signal, the clocks will not function properly.
Master Mode
When using more than one AT Transceiver, you can set the ATX to
operate in “Repeater” mode. See page 9 for setting the ATX as a
Repeater.