101767-001 REV 1.10
4/13/16
2
Introduction
The ComSonics QAM CompassTM is a versatile multi-function cable signal leakage detector designed for medium
distance to near-field use. Working in conjunction with ComSonics’QAM MarkersTM installed at the local cable
system head-end / hub or the portable ComSonics’ Mini Mobile Marker (M3TM), the QAM CompassTM provides
technicians with both visual and audible indications of signal leakage in the VHF and two UHF bands allowing
them to find and repair leaks that would otherwise go
unrepaired.
General Operation
The QAM CompassTM has five primary functions on the front
panel used to control the device (Figure 1).
Turning the Unit On and Off:
The QAM CompassTM is turned ON by a single push of the
power button at the bottom left of the panel. To power off
the device, push the power button again and the unit will
power down.
Modes of Operation
The QAM CompassTM has three modes of operation: (1)
Measure Mode (2) Monitor Mode and (3) M3 Mode. The
mode button and LED indicators are located on the left
hand side of the panel. Each press of the mode button will
cycle through each of the modes allowing the user to select
their desired mode of operation.
Distance Setting
The mode button is also used to select the distance setting. This allows the user to more accurately measure
leakage field strength at a given distance from the leak. The selectable distances are: 1’, 10’ (default), 30’, 75’,
and 150’. The units can be changed to meters using the configuration utility. In order to change the distance
setting, press and hold the Mode button for two seconds. The display will start to flash with the current
distance setting displayed. Use the up and down arrows to change the distance to the desired setting. The
display will automatically return to its normal state a few seconds after the last arrow push. In addition, the
current distance setting is displayed directly after the firmware version when initially powering on the QAM
CompassTM.
Frequency Band
The QAM CompassTM has three frequency bands for leakage detection: (B1) VHF frequency: 136.5 MHz to 140.5
MHz; (B2) UHF frequency 1: 606.5 MHz to 614.5 MHz; (B3) UHF frequency 2: 720 MHz to 1,200 MHz. Each
programmed frequency must coincide with a generated signal from a QAM MarkerTM or M3TM device in order
to detection to occur. The Band button and LED indicators are located on the right hand side of the panel.
Each press of the Band button will cycle through each of the frequency bands allowing the user to select their
Figure 1: Front Panel Controls
