User Manual

EASy-PLUS
®
User Manual
24 –
TRILITHIC
Rev 1.02
connect the EAS IN at the SW-1 switch later in this procedure.
Repeat this procedure on all modulators and processors that have a composite I.F. loop-through on the rear of their
housing.
7.2 Selecting a “Designated E.A.S. Channel” at I.F.
You will assign one channel on the cable system as the “Designated E.A.S. Channel”. This is the channel on which all
E.A.S. alerts and messages received via your Local Primary monitoring stations (i.e.: AM, FM, or NOAA) will be
displayed. Depending on installation techniques used, these messages and alerts will appear in the form of a gen-locked
crawl message over either the existing video or over a full page blue background. Selecting a low priority channel (one
which is not trapped or scrambled as it enters every home on the system) as the “Designated E.A.S. Channel” is
optimum. Generally, a community access channel, government channel, or character generator channel in the VHF
television band (i.e.: ch. 2-13) is ideal to use for the “Designated E.A.S. Channel”.
NOTE: IN ALMOST ALL INSTANCES A MODULATOR WITH A COMPOSITE I.F. LOOP WILL BE USED FOR THE
“DESIGNATED EAS CHANNEL”. THERE ARE EXCEPTIONS, SUCH AS BASEBAND OR CHARACTER
GENERATOR EAS SYSTEMS OR COMBINATIONS OF BASEBAND AND I.F. SYSTEMS. THESE EXCEP-
TIONS WILL BECOME APPARENT IN EACH INTERFACE SECTION OF THIS MANUAL.
7.3 LS-16P Lossless Splitter Placement and Connection
The LS-16P is a precision I.F. distribution amplifier (D/A) which has a 20dB continuously variable precision attenuator for
I.F. alignment on each of its 16 output connections. The LS-16P is also used to insert a DC drive voltage on the output
drop cable’s center conductor for activating each SW-1 or SW-4 switch, as well as other LS-16P input connections when
the EAS system is activated.
For most applications, multiple LS-16P(s) will be needed. In all installations, the first LS-16P, which receives its input