The Line Timer
Each PSN Page will also have a line timer value at the bottom that can be set between
1 and 99 seconds.
Broadcasting PSN Information
While a page is ‘ACTIVE’ the BW RDS2 will broadcast in a sequence each individual
‘Enabled’ line for the amount of time indicated by the Line Timer. If a page has only
one Enabled line the PSN information will be ‘Static’. If more than one line is
Enabled the PSN information will be ‘Dynamic’. If the PSN page is still ACTIVE
after the last Enabled line has been broadcast, the sequence will begin again from the
first Enabled line.
Example
: In the screen above, if Page 1 is ACTIVE, the PSN information that will be
broadcast is:
Text1
broadcast for 1 second
Text2
broadcast for 1 second
Text3
broadcast for 1 second
Text1
broadcast for 1 second
Text2
broadcast for 1 second
…
This cycle will continue for as long as Page1 is ‘ACTIVE’.
Dynamic PSN
The ability of the RDS2 to broadcast a sequence of PSN lines each for a set amount of
time makes it possible to overcome the previous restrictions of only having 8
characters in which to display any message. Constantly changing the PSN allows
messages to be broadcast using a sequence of words in small groups or even allows
scrolling messages to be broadcast by broadcasting a sequence of lines that change by
only one character at a time.
Caution
Although Dynamic PSN is a popular function of capable RDS
encoders, both the RDS and RBDS specifications deprecate the use of
dynamic PSN’s for safety and technical reasons.
The two main issues with Dynamic PSN’s are,
•
Safety :
Dynamic PSN can distract a vehicle driver which
increases the likelihood of road traffic accidents.
•
Technical :
An RDS receiver automatically copies the last PSN
received into it’s internal memory, so that the next time the frequency
is tuned the PSN in memory is displayed until a new PSN is received.
This often gives rise to garbage messages appearing on the receiver
display causing confusion to the listener. Also various RDS chip
manufactures have designed their RDS chips in different ways and
19
Summary of Contents for rds2
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