US Alert Alert Monitor Receiver User manual

WatchDog LT
Alert Monitor
Receiver
USER GUIDE
This users guide has been developed for the WatchDog LT paging alerting receiver.

The USAlert WatchDog LT pager has been developed specifically for the public safety
environment for alerting firemen and other emergency personnel. In addition to public
safety systems the WatchDog LT pager can be used in any radio system that requires tone
alerting and channel monitoring. The all new WatchDog LT pager offers many new and
exciting features over other previous generation voice pagers.
CHANGING BATTERIES
Locate the metal tab under the top of the belt clip. Lift the tab slightly towards the belt
clip and slide the belt clip up from the bottom of the pager and remove the belt clip.
Remove the captive screw located under the belt clip location. Lift off the battery door
and remove and replace the batteries. Note that the batteries all face in the same
direction. Observe proper polarity when reinserting the batteries.
Turn the pager on to make sure the batteries are inserted properly and then turn the pager
back off. Replace the battery door and tighten the captive screw. Caution to not over
tighten the screw.
Reinstall the belt clip by depressing the tab and the metal latch inwards towards the top of
the belt clip.
Note that there are two slide rail features on both sides the metal latch on the belt clip.
These features mate with groves in the back cover for the belt clip. Slide the belt clip
back into place. You will feel and hear a click sound when the belt clip has been fully
slid down into its proper location.
WATCHDOG LT PAGER CONTROLS AND FUNCTIONS
On / Off and Volume Control
The on / off volume control is located on the top of the pager and allows turning the
pager on or off and provides a continuous adjustment for the audio and alert levels
providing the alert is not set for the maximum volume option.
Four Position Function Switch
The four position function switch is located on the top of the pager in the center. Each
position can be individually programmed for the channel desired, selective call mode,
monitor mode, alert type and type scan.
Reset button
The reset button is located on the top of the pager and is typically used to reset the audio
and put the pager back into the standby mode. It can also be used to place the pager into
the “quick monitor” or “audio lock on” mode of operation. Depress the reset button and
release in less than .75 seconds and the pager will return to the standby mode. Press and

hold for .75 but less than 1.5 seconds and the pager will enter monitor mode. Press for
more than 1.5 seconds and the audio will lock on and remain on continuously until reset.
Front Control Buttons and Voice Memory Control
There are three buttons located on the front of the pager for voice memory message
control. The right button will initiate playback. The left and center buttons will allow
selection of stored messages in a forward or reverse direction.
Messages memory is 4 minutes and all messages stored dynamically. Each time the right
button is depressed the last message stored will replay or repeat from the beginning.
Using the left or center button can change the message to be played once playback has
been initiated.
Deleting messages – To delete all message hold down the top reset button and power off
the pager. All messages will be removed from memory.
Voice Memory Playback in Detail
WatchDog LT models can dynamically record up to 4 minutes of messages. Messages
can be played back using the right button to initiate play back and then using the left and
center buttons to select which message to replay. If no message is stored the pager will
emit a short beep.
Depressing the right front button will start message playback. Each time the right button
is depressed the last message stored will replay or repeat from the beginning. Using the
left or center button can change the message to be played once playback has been
initiated.
Deleting messages in accomplished by depressing and holding the top reset and power
off the pager. All messages will be removed.
FEATURES AND OPTIONS
Quick Monitor
The WatchDog LT pager allow entering the channel monitor mode (“quick monitor”)
using the top reset button only when the four position function switch is in a selective call
position. Simply depress the top reset button and hold for 0.75 second then release the
reset button. The pager will emit a short beep and automatically begin channel
monitoring. The traffic of the channel selected by the four position function switch can
now be monitored. To exit channel monitoring simply depress and release the reset
switch. The WatchDog LT will now return to selective call standby.

Audio Lock
The WatchDog LT “audio lock” function allows opening the audio at any time regardless
of the three position function switch. Simply depress the reset button for approximately
1.5 seconds. The pager will emit a short beep at 0.75 seconds (continue to hold the reset
button) and you will hear two short beeps at 1.5 seconds. After the two short beeps
release the reset button and you are in the audio lock mode.
Audio lock mode is useful in lower signal conditions where voice quality (reception) may
be changing due to pager movement. With the audio is locked on you might be able to
move while listening to a message to achieve best position for reception. If your
WatchDog LT has two frequency capabilities then the audio lock function is active for
the channel selected by the function switch.
To exit the audio lock mode simply depress and release the reset button. The WatchDog
LT will now return to selective call standby.
Audio Function Modes
Revert to Carrier Squelch - Revert operation allows the pager to automatically switch
from selective call to channel monitoring after receipt of an alert. The pager will remain
in channel monitoring until the reset button is depressed and released. At this time the
pager will return to selective call standby.
Manual Reset - After receipt of an alert the pager will open the audio channel for
messaging and lock the audio on until the reset button is depressed and released. At this
time the pager will return to selective call standby.
Auto Reset – After receipt of an alert the pager will open the audio channel for
messaging. The audio will remain open until the carrier drop at which time the audio will
automatically reset. The pager automatically returns to selective call standby.
Timeout Reset - After receipt of an alert the pager will open the audio channel for
messaging. The audio will remain open until the preprogrammed “timeout” has expired.
The timeout timer is initiated at the start of the alert cycle and ends based on the
preprogrammed timeout time. The pager will then automatically returns to selective call
standby.
Revert with N Time Delay - Adding the N time delay to revert operation causes the
WatchDog pager to disregard the state of the carrier during the N time. The N time
begins immediately after the alerting cycle and ends on N timeout. At this time the
WatchDog will enter normal revert to carrier squelch operation.

Auto Reset with N Time Delay - Adding the N time delay to revert operation causes the
WatchDog pager to disregard the state of the carrier during the N time. The N time
begins immediately after the alerting cycle and ends on N timeout. At this time the
WatchDog will enter normal auto reset operation.
LOW BATTERY ALERT
The WatchDog LT pager will provide an audible tone alert “beep beep” to indicate a low
battery condition. The audible low battery reminder is every 2 minutes.
Additionally, the WatchDog LT has a three level LED battery level indicator on top of
the pager. All three bars lit represents fully charged batteries.
WatchDog Scan Operation
The WatchDog LT pager provides three types of scan. Channel scan, selective call scan
and priority scan.
Channel Scan - When the WatchDog LT is in the channel scan mode it will alternately
search from frequency 1 to frequency 2 looking for presence of carrier. The primary
function of channel scan is to allow monitoring any activity on either channel. Only one
channel can be actively monitored at a time. If activity is detected on either F1 or F2 the
WatchDog LT pager will lock on that channel until channel activity ceases. At this time
the pager will resume scanning between channels.
Priority Scan - If priority scan is selected the WatchDog LT pager will alternately
search from frequency 1 to frequency 2 looking for the presence of carrier. Alerting can
only occur on priority channel (F1). If channel activity is detected on F1 then the
WatchDog LT pager will lock on F1 and remain on F1 until channel activity ceases. At
this time the scan function will resume. If channel activity is detected on F2 then the
WatchDog LT pager will process voice on F2 and periodically scan back to F1 looking
for presence of carrier. Anytime channel activity is detected on the primary channel the
pager will lock on that channel.
Selective Call Scan - The selective call scan mode allows the WatchDog LT to silently
scan from channel to channel looking for address tones. The pager will only open the
audio path based on detection of an address and not just channel activity. If a proper
address is detected the WatchDog LT will alert and open the audio path for messaging.
After the messaging period the pager will continue to function based on the “audio
function” programmed such as “revert to carrier squelch”, “auto reset”, manual reset and
so on.
In order to return to the scan mode the pager must first enter selective call standby. This
is done automatically if the audio function is programmed for “auto reset” or “timeout”.
If programmed for “revert” or “manual reset” then the reset button must be depressed and
released. The WatchDog LT will then resume selective calls scan.

Alerting Features
The WatchDog LTis capable of alerting in three different ways. Tone alerting, vibrate
alerting and tone / vibrate alerting. The three position function switch can be pre-
programmed for the type of alert desired and in which switch position.
Tone Alerting - If tone alert is selected the WatchDog LT pager will emit an audible
tone alert immediately following proper address detection. The alert duration is generally
controlled by the length of a transmitted address tone.
Vibrate Alerting - If vibrate alert is selected the WatchDog LT pager will vibrate
immediately following proper address detection. The vibrate alert duration is generally
controlled by the length of a transmitted address tone.
Tone / Vibrate Alerting - When tone / vibrate is selected the WatchDog LT pager will
alternately tone alert then vibrate alert for the duration of the alerting cycle. The duration
of the alerting cycle is typically controlled by a transmitted address tone.
Revert or Auto Reset with N Time Delay and Voice Memory Operation
There are two normal operating modes commonly used in public safety communications
systems with reference to transmissions of tones and voice messaging. The first method
is to transmit tones with voice messaging immediately following the tones with no
disruption in the continuous transmission of the carrier. If your system uses this mode of
operation then the N time delay should not be used.
The second system mode allows the carrier to drop following the transmission of tones
for about one second then up again to process voice messaging. If your system utilizes
this mode and your WatchDog LT is equipped with voice memory then selection of
“revert with N time delay” is recommended. Why?
Message recording in most voice pagers use the end of the alerting cycle to signal the
voice memory device to begin recording and use the carrier squelch function to control
when to stop recording. The end of pagers alerting cycle is normally controlled by the
end of the second tone in a two tone sequential transmission or the end of the long tone in
a single tone transmission. In systems that drop the carrier after tone transmissions the
pager would begin recording after the alert cycle but stop recording immediately due to
no carrier present.
The “N Time” function allows the pager to essentially ride thru the carrier drop after
tones are transmitted and to continue to record the message. The N time is programmable
in length to allow for system variations. Select an N time that is longer than the carrier
drop to prevent early termination of message recording. Other words if the carrier
typically drops for one second then program the N time to two seconds. In this case, after

the two second N time the pager will resume watching the carrier to signal when to stop
recording.
WATCHDOG CHARGER
The WatchDog series charger is both a smart charger and a rapid charger. It will charger
both the WatchDog pager and a spare set of NiMH batteries simultaneously or
individually.
The rapid charge period is approximately 3-4 hours from a completely discharged state.
A typical recharge period for moderately discharged batteries is approximately 2 hours.
There are three colored LED’s on the front of the charger. The green led indicates power
is applied to the charger and the two red LED’s indicate charging for the pager and spare
batteries.
Recommended steps to begin using the WatchDog series charger:
a. Plug the wall transformer into the charger base.
b. Then plug the wall transformer into an appropriate AC wall socket. The
WatchDog charger will operate from a normal 117 vac source.
c. The green led should turn on.
d. Insert the pager or spare batteries or both into their corresponding positions in
the charger. The spare batteries all face in one direction as the label indicates
in the spare battery compartment.
e. The red led closest to the green led will flash when the pager is inserted
properly and in a normal charging cycle.
f. The outboard red led will flash for charging the spare batteries.
CHARGING INDICATIONS
After the pager or spare batteries are inserted into their proper locations the
corresponding red LED will begin to flash. This indicate charging is underway. When
the charge cycle nears completion the corresponding red LED will begin to flash at a
faster rate indicating the batteries are close to a full charge. When the charge cycle is
completed the red LED will be on continuously. At this time the charger will enter a
trickle charge mode to maintain the charge on the batteries. If the pager or spare battery
RED led does not light and the pager or spare batteries are inserted properly then there
may be a battery failure.
DO NOT RECHARGE ALKALINE BATTERIES.
The WatchDog charger has been designed to properly recharge and maintain NiMH
batteries.
Other types may cause improper operation of the charge.