A New Active CATV System Echo Testing Technology (1984)

By Warren L. Braun, ComSonics, Inc.

Various attempts have been made to quantify the transient or "echo" performance of CATV systems. Most of the testing done to date has dealt with the echo level tolerance following the limits devised by P. Mertz. Recent subjective tests by Bell Laboratories have shown that the Mertz's curve is too simplistic to define chrominance visual degradation since the Mertz subjective tests were conducted with monchrome sources.

The recent criteria require a CATV system testing technology beyond that developed to date. The author's firm has developed apparatus capable of highly refined CATV system echo testing, which when applied to existing systems and hardware, unveils new distortion factors not previously quantified in CATV systems.

The past measurement techniques and the recently developed measurement technology are discussed, together with samples of component and system measurements taken, consistent with the latest criteria.

The importance of these parameters are discussed especially as applied to high speed data signalling in cable systems such as are associated with vertical blanking interval data. It is also shown that these same distortions can degrade picture quality in CATV systems. Remedial procedures are discussed.

By clicking the "Download Paper" button, you are agreeing to our terms and conditions.

Similar Papers

A New Active CATV System Echo Testing Technology
By Warren L. Braun, ComSonics, Inc.
A Reliable And Reproducible Technique For Evaluating The Shielding Effectiveness Of CATV Apparatus
By Warren L. Braun, ComSonics®, Inc.
The Case Of The Disappearing Head Room
By Warren L. Braun, P.E., ComSonics, Incorporated
A Frequency Measurement Technique For CATV
By Warren L. Braun, Warren Braun Consulting Engineers
Active Trap Technology And Addressability
By Ray St. Louis, PICO Products, Inc.
CATV System Performance -- The New York Experience
By Kenneth L. Foster, New York State Commission on Cable Television
New Approaches To CATV System Powering
By Tom S. Osterman - Alpha Technologies Inc. , Joseph L. Stern - Stern Telecommunications Corp. , Paul Lancaster - Stern Telecommunications Corp.
Packetcable: A New Interactive Cable System Technology
By Paul Baran, Packetcable Inc.
CATV Proof Of Performance Testing
By Mike McKeown, LVO Cable, Inc.
Advances In Technology And New Installation Configurations Suggest Mechanical Modifications In CATV Amplifier Housings
By Scot Milne, Magnavox CATV Systems Company
More Results >>