User guide

62 Tempest®24 00 4-Channel Wireless Intercom System
Accu- Sync
Three BaseSta ons Accu-Synced
Accu-Sync provides a common  ming signal between connected BaseSta ons. This signal ensures that transmission cycles
for all Accu-Synced BaseSta ons occur simultaneously. This synchronized transmission eliminates the nega ve RF e ect
called desensing. See the following sec on, “Special RF Considera ons for Mul ple BaseSta ons,” for more informa on
on connec ng mul ple BaseSta ons.
When two or more Tempest BaseSta ons are to be operated in the same loca on, connec ng the BaseSta ons via the
BaseSync connector on the back of the BaseSta on, minimizes poten al RF interference between BaseSta ons. The more
BaseSta ons there are in close proximity to each other, the more important it is to use Accu-Sync.
One BaseSta on must always act as the sync source when using Accu-Sync. The sync source is any BaseSta on that does
not have a BaseSync cable plugged into the BaseSync IN connector. Always ensure that one, and only one BaseSta on has
an open (no connec on) BaseSync IN connector.
When a BaseSta on does not have a BaseSync cable plugged into the BaseSync IN connector, that BaseSta on uses an
internally generated  ming pulse to control its own transmission cycle.
When a BaseSta on has a BaseSync cable plugged into the BaseSync IN connector, that BaseSta on uses the external sync
signal ( ming pulse) to control its transmission cycle.
The BaseSync cable is a DE-9F To DE-9M wired straight through on pins 1-5. The maximum distance a BaseSync cable can
be is 1,500 feet (457.2 m).
BASESYNC IN
Accu-Sync - DE-9 Connector
Never connect Accu-Sync cables between 2.4GHZ and 900MHz Tempest models.