ComSonics 2007VMD Users Manual
TM
Qualifier X-Ray
Non-Intrusive
Dwelling Ingress Integrity
Measurement System
USER GUIDE
CSI Doc. 101399-001
Qualifier X-Ray
Limited Warranty
Hardware: ComSonics, Inc. (ComSonics) warrants to the original end user
(Customer) that the new ComSonics branded products will be free from defects
in workmanship and materials, under normal use, for one (1) year from the date
of original shipment. ComSonics warrants repaired and refurbished ComSonics
products for ninety (90) days from date of shipment.
Agency Notice
Hand Held Device Vehicle Mounted Device
FCC ID: PYN2007HHD FCC ID: PYN2007VMD
IC: 4261A-2007HHD IC: 4261A-2007VMD
Complete Limited Warranty and Agency Notice documentation is printed in the
back section of this user guide.
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Technical Support
ComSonics maintains a Technical Support Service for customer convenience.
Contact a Support Representative at 1-800-336-9681 or 1-540-434-5965;
Fax 1-540-432-9794; or Email tech-support@comsonics.com.
Copyright
All material in this manual is the property of ComSonics, Inc. and protected under
the United States copyright law. No material shall be reproduced or used in any
form or by any means (graphic, electronic, or mechanical, including photocopying,
recording, taping, or information storage and retrieval systems) without the written
permission of:
Harrisonburg, Virginia 22801 USA
Phone: (540) 434-5965 USA Toll Free: (800) 336-9681
Email: marketing@comsonics.com
Qualifier is a trademark of ComSonics, Inc.
2007 ComSonics, Inc. All Rights Reserved
ComSonics, Inc.
1350 Port Republic Road
Post Office Box 1106
Fax: (540) 434-9847
Internet: www.comsonics.com
CSI Doc. 101399-001 Rev. B
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Table of Contents
Introduction.......................................................................................................1
FCC License Requirement ...........................................................................1
Unpacking ....................................................................................................1
Qualifier X-Ray System Overview ................................................................2
General Information..........................................................................................3
Hand Held Device (HHD) .............................................................................3
Battery Installation .................................................................................3
Single Button Control.............................................................................3
Auto Power Off ......................................................................................3
Display Screen.......................................................................................4
Threshold Value Setup ..........................................................................4
Hardware Installation ...................................................................................6
Dual Band Antenna................................................................................7
Vehicle Mount Device (VMD).................................................................7
Check / Select Transmit Frequency.......................................................8
Test the VMD Installation.......................................................................8
Qualifier System Installation Verification......................................................9
Troubleshooting Notes .................................................................................9
Using the Qualifier X-Ray System.................................................................10
Dwelling Shielding Integrity Measurement Procedure ...............................10
Specifications .................................................................................................11
Accessories / Parts.........................................................................................12
Warranty Statement........................................................................................13
Agency Notice.................................................................................................15
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Qualifier X-Ray
Major Components
Display
Screen
Power / Test
Button
Test Button
Power Button
Status Indicators
Antenna Connector
Power Harness Connector
Input
Connector
Battery
Compartment
Fuse
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Introduction
FCC License Requirement
A FCC license is required to operate the Qualifier X-Ray System, specifically the
vehicle mount transmitter device (VMD).
Refer to the Qualifier Transmitter Licensing section on our website at
http://www.comsonics.com/downloads.html#qtl for application instructions and
templates.
If you need assistance, please call our Customer Service Department at
1-800-336-9681.
Unpacking
The Qualifier X-Ray System and accessories are shipped in a single container
designed to provide maximum protection during transit. Immediately upon receipt,
inspect the container and contents for signs of physical damage. Notify the freight
forwarder of any damage detected.
Installation Caution!
The Qualifier X-Ray System is designed only for vehicles equipped with a 12-volt
negative ground electrical system.
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Qualifier X-Ray
Qualifier X-Ray System Overview
The ComSonics Qualifier X-Ray System provides a method for identifying the
internal shielding integrity of the CATV network in a subscriber’s residence without
the need to enter the premises.
A test activation transmitter is located within the Qualifier Hand Held Device
(HHD). This transmitter provides a signal to the Qualifier Vehicle Mounted Device
(VMD) and sets up the HHD to measure levels of ingress from the VMD signal
appearing in the return upstream path.
With the HHD connected to the residential side of either the ground block or the
drop cable, a press of the HHD button activates the VMD to generate a brief 5watt signal pulse at a frequency, just above the CB radio band, within the upstream frequency spectrum.
The VMD test signal envelopes the residence with a level of about +58 dBmV
(assuming the service vehicle is about 75 feet from the residence). Shielding
flaws, within the residential cabling, allow the VMD signal to enter the return upstream path. The HHD detects the VMD test signal and displays a shielding integrity value based on the ingress level measured.
The threshold setup function in the HHD determines the indication of PASS or
FAIL with the integrity measurement.
Shielding Integrity Measurement
The Qualifier X-Ray System utilizes a unique measurement method to determine
the relative shielding integrity of a customer premise without a need to enter the
structure. This method provides the user with a numeric display representing a
calculated shielding factor, in dB, of the premise under test.
The type of flexible coaxial cable used for drops and house wiring typically has a
shielding integrity factor in the range of 80 to 120 dB. But with the addition of connectors, splitters, VCRs, televisions, PC modems, and other devices along with
improper installation techniques; the total overall shielding integrity can degrade
appreciably. The possibility of noise ingress (undesirable signals) increases
greatly if the shielding integrity is not sufficient. Noise ingress causes interference
with the return path signals and reduces the reliability of two-way signal communications.
The Qualifier X-Ray system enables the user to obtain a shielding integrity reading in the range of 80 dB (very good) to 25 dB (very poor). Each measurement
reading includes a PASS or FAIL indication, based on a user selectable threshold
value, for easy measurement status determination. The threshold function can be
turned off.
Formula for calculating the shielding integrity reading:
D2I = Pmax [+85] - (antenna gain [2.5] + free space loss [25]) - measured value
*D2I is the acronym for Dwelling Ingress Integrity
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