Page 42
Doc. 13300-REC-RevB (2022-05-02)
Recreational Modes
Operating Instructions
9.5. Using Multiple Transmitters
When using multiple transmitters, best reception
reliability will be attained by using transmitters
with different transmission intervals or by using
transmitters with active collision avoidance such as
the Shearwater Swift Transmitter�
When two transmitters of the same transmission
interval are used, the potential exists for their
communication timing to become synchronized�
When this occurs, data dropouts may result and could
last up to 20 minutes or more�
Legacy Shearwater transmitters of different
colors have different transmit timing� This reduces
communication collisions that could potentially cause
a loss of connection�
When using more than two transmitters, Shearwater
recommends using the Swift transmitter which
actively ‘listens’ for other transmitters in the vicinity
and dynamically alters transmit timing to avoid
interference�
There is no defined upper limit to the number of Swift
transmitters that can be run concurrently� For more
details, see the Swift Operating Instructions Manual�
Using Multiple Transmitters With The Same
Transmission Interval May Result in Lost
Comms
When using more than one transmitter, use transmitters
with adaptive collision avoidance or legacy transmitters of
different colors to prevent interference (see above).
Sidemount SAC and GTR
Sidemount SAC and GTR are calculated the same way
as single tank SAC and GTR except the tank pressures
are pooled prior to each calculation� Essentially the
two tanks are treated as one large tank�
Sidemount SAC and GTR calculations are dependent
on the assumption that both sidemount tanks are of
identical volume�
Note that SAC rate is not transferable between tanks
of differing volumes� You must convert SAC to RMV
for comparing gas consumption across different tank
configurations�
For the purposes of RMV calculations using
sidemount SAC, follow the same procedure outlined
for a single tank in the SAC calculations section on
page 43�, but add all of the relevant tank attributes
together as if you were using a single large tank�
Total volume = Volume
Tank 1
+ Volume
Tank 2
Total rated pressure = Rated presure
Tank 1
+ Rated pressure
Tank 2
