101703-001 REV E
4/12/16
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allows the technician to differentiate between the detected frequencies without needing to look at the
display. If both frequencies are detected, both tones will sound in an alternating sequence. The QAM
Shadow
TM
will now simultaneously detect both the Marker and M3 leakage. This means there are 4
unique warble sounds that can be produced: VHF Marker, VHF M3, UHF Marker, and UHF M3. A
maximum of two warbles will sound during any mode of operation.
Monitor Mode
The Monitor Mode is active when the QAM Shadow
TM
is on and the lid is closed. In this mode the QAM
Shadow
TM
samples for leakage every 15 seconds with a corresponding green LED flash to indicate
measurements are being made. The device automatically monitors both 138/139 MHz and 612/614 MHz
when in Monitor Mode. When a Marker leak is detected at a level exceeding the Monitor Mode Squelch
setting, the speaker will emit a short warble tone that is associated with the detected frequency. If
leakage is detected at both frequencies, the warble tone will sound for both the 138/139 MHz tone and
the 612/614 MHz tone. Pressing the front button momentarily will mute the warble tone for five
minutes. Opening the display cover will cancel the mute. The Monitor mode also monitors for M3 leaks
as well and will emit a short warble similar to the leakage warnings.
Measure Mode
Opening the lid activates Measure Mode and will also illuminate the display backlight for approximately
ten seconds. Measure Mode allows technicians to take continuous leakage measurements.
Momentarily pressing the button reactivates the backlight for another 10 seconds.
When in the Measure mode the QAM Shadow
TM
monitors both the 138/139 MHz
AND
612/614 MHz
frequencies. It automatically switches between the two frequencies approximately every two seconds.
In addition, the QAM Shadow
TM
simultaneously detects both the Marker and M3 leakage at each
frequency. Thus there are 4 measurements that are automatically being measured: the Marker and M3
at 138/139 MHz and the Marker and M3 at 612/614 MHz. The benefit to the technician is that it allows
them to do a single sweep of an area such as a house without having to switch frequencies. It also
provides operational simplicity as the tech can now simply open the lid and the device will automatically
scan both frequencies and both signal types… without the tech performing any additional steps.
Selecting a Fixed Frequency
When cable leakage is detected, the QAM Shadow
TM
will continue to automatically switch between the
VHF and UHF frequencies approximately every 2 seconds. The technician may desire to have the device
monitor a single frequency of choice in a continuous mode. This can be done by pressing and holding
the button for 2 seconds to cycle between the UHF and VHF frequencies. The 1
st
two second button
push will cycle the device to a continuous VHF frequency measurement only. The 2
nd
push of the button
will cycle the device to a continuous UHF frequency measurement only. Each subsequent two second
push will continue to cycle between the two frequencies. In order to return the device to the default
two frequency scan, the user can close and reopen the lid.
