Specifications

5/9/13 888-2857-001 5-57
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Platinum VAX-C Series
Static delay is sometimes known as “Transmitter Trimming Delay”
5.16.3 Offset Delay
Offset Delay is a fine tune setting to delay the output of an individual transmitter to
alleviate real-world reception difficulties typically due to localized geographical
conditions or unequal transmitter powers. The offset delay at each site can be controlled
remotely from the multiplexer via the ETI stream.
Figure 5-29 Graphical Representation of DAB Signal Delays
(175ms)
ETI DISTRIBUTION NETWORK LATENCY
DYNAMIC DELAY COMP.
ADDED BY LPU
ETI SIGNAL TRANSMITTED FROM MULTIPLEX ETI SIGNAL ARRIVES AT TX SITE DYNAMIC DELAY TARGET SET
AT MULTIPLEX
THE MAIN DELAY SETTING FOR THE ENTIRE
NETWORK PLUS ANY ETI OFFSET DELAY FOR
THIS INDIVIDUAL TX SITE
INHERENT PROCESSING
DELAY IN MODULATOR
STATIC DELAY COMPENSATION
ADDED BY LPU
STATIC DELAY TARGET SET LOCALLY OPTIONAL MINOR ADVANCE SET BY OUTPUT PROCESS TIME SIGNAL LEAVES TRANSMITTER
OVERALL TRANSIT TIME
DYNAMIC DELAY
STATIC DELAY
OFFSET DELAY
COMPENSATES FOR CHANGING LATENCY IN THE ETI
DISTRIBUTION NETWORK TO THE TRANSMITTER SITE.
COMPENSATES FOR DIFFERENT INTERNAL PROCESSING
DELAY FOR VARIOUS EQUIPMENT TYPES. CAN ALSO BE
USED TO MANUALLY SYNCHRONIZE TRANSMITTERS AND
MANUALLY ADD A LOCAL OFFSET FOR SIMPLE SFN
NETWORKS WITHOUT DYNAMIC DELAY ACTIVATED.
ADDED TO AN INDIVIDUAL TRANSMITTER TO ACCOUNT
FOR PARTICULAR GEOGRAPHICAL AND PROPAGATIONAL
CONDITIONS. MAY BE ADDED TO THE DYNAMIC DELAY
BUFFER VIA AN MSNC SETTING IN THE ETI STREAM, OR
LOCALLY TO THE STATIC DELAY BUFFER VIA THE ADJUST
ETI STATIC DELAY SETTING IN THE LPU WEB BROWSER.