Ips Remote Activation Faults - Whelen Engineering Company IPS 400 Product Manual

8.3 IPS Remote Activation Faults

Once it has been established that the IPS will operate via local controls, several conditions concerning remote controls or remote
activation link faults may be examined.
Part A. Central Control Point
IPS will not Localize the fault to either
activate via RF the central control point or
link. the remote (i.e., IPS
cabinet) station/site.
Determine the fault(s)
within the central control
point side of the RF link.
Determine whether the
IPS will not
encoder's DTMF tones are
activate via RF
being modulated properly
link (con't.).
by the transmitter.
Ensure that central control point transmitter and encoder are ON.
Verify that the central control point transmitter and IPS station/site address
code is selected on the central control point encoder.
Verify that the correct IPS station/site address code is selected on the central
control point encoder.
If more than one IPS station/site exist in the communication system setup,
determine that the encoder will address an IPS cabinet not in question. If
the encoder will address one or more IPS cabinet stations, excluding the
one cabinet station that will not activate, perform the troubleshooting steps
concerning the IPS cabinet station side of the RF link. (Refer to Part B
below.)
Listen to the activation link transmission from a monitor or radio receiver
on the activation link frequency.
Send a CLEAR (or CANCEL) command.
Verify that the DTMF tones are audible on the monitoring device.
If the result of the above step is negative, inspect the audio connection
between the encoder and transmitter and the encoder PTT circuit.
Obtain assistance from a radio service facility. Using an FM test set, ensure
that the DTMF tone level modulation is set at 2.5 KC. If tone squelch is
utilized, the modulation factor for the tone squelch should be added to the
DTMF tone level set up.
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