Audemat Audemat
FMX480

What are the differences between PTY in RDS and PTY in RBDS?
PTY – Program Type
This is an identification number to be transmitted with each program item and which is intended to specify the current Program Type from 31 possible choices. This code can be used for search tuning. The RDS PTY codes are set by the CENELEC standard (http://www.cenelec.org/Cenelec/CENELEC+in+action/Web+Store/Standards/default.htm), the PTY codes for the U.S version (RBDS) are defined in the NRSC 4-A standard, available at http://www.nrscstandards.org/Standards.asp. Here is the list.

PTY code RDS Program type RBDS Program type
0 No program type or undefined No program type or undefined
1 News News
2 Current affairs Information
3 Information Sports
4 Sport Talk
5 Education Rock
6 Drama Classic Rock
7 Culture Adult Hits
8 Science Soft Rock
9 Varied Top 40
10 Pop Music Country
11 Rock Music Oldies
12 M.O.R. Music Soft
13 Light classical Nostalgia
14 Serious classical Jazz
15 Other Music Classical
16 Weather Rhythm and Blues
17 Finance Soft Rhythm and Blues
18 Children’s programs Language
19 Social Affairs Religious Music
20 Religion Religious Talk
21 Phone In Personality
22 Travel Public
23 Leisure College
24 Jazz Music Unassigned
25 Country Music Unassigned
26 National Music Unassigned
27 Oldies Music Unassigned
28 Folk Music Unassigned
29 Documentary Weather
30 Alarm Test Emergency Test
31 Alarm Emergency
Can I protect HTTP and TELNET access?
There is a way to password protect both the web server and the Telnet access.
10 users can be defined with 3 levels (N, S, R, for Normal, Super, Root). To display these settings, enter the command:
?Users

To change or to define a user, the command is user<n>=<username>,<password>, level. For example, the command user1=admin,admin,R creates an account with login "admin" and password "admin" with Root privileges.

By default, the user0 is "root" with password "root" and Root access level.

To turn on security Telnet the command is secure=on. To secure the embedded Web pages, the command is secure_cgi=on. When this parameter is activated, users can see the configuration but changes are not allowed without login and password.

Be careful: if you forget your user account parameters when security is enabled, you will not be able to reach the FMB80!
How can I select the measurement I want to perform during a campaign, and how can I unselect other one?
In the design philosophy of the Navigator 100, we have set 2 modes. One mode is when measurement is done as the vehicle is moving (mode FAST), the other one suits for a fixed position during the measurment (mode slow).
Depending of the mode a certain number of parameters are sampled and then stored into the flash card. We do not have decided for the user, in the field being able to select and unselect a measurement type or another because it's better to get all the parameters and then remove the corresponding column in the Excel resulting file.
In the slow mode there are more than 40 parameters and it would be exhausted for the user (which may not be a technician) to configure whether or not to store each of the 40 parameters.
Moreover, often, it's interesting to have a general opinion of how the reception is and then remove parameters that may not be relevant for a report.
Is the FMX480 EBU/UER protocol compatible?
The FMX480 is fully EBU compatible: the exact name of the protocol is UECP (Universal Encoder Communication Protocol) for RDS.
The FMX410 is also compatible with UECP for the implemented static features.
My Digiplexer is blocked when I turn it on.
- In this case, turn it off, and turn it on again.
- Push both buttons of the front panel at the same time.
- The Digiplexer should start in a special ( non-functionnal) mode.
- Then used the Digiplex software to reload the DSP software.
- Turn it off and on again. The Digiplexer should start in the functionnal mode.
- With an ASCII terminal, enter this command:
INIT_VERSIONK
The answer must be : +
Transmission of RDS groups type 15B.
Out from the UECP specification version 5.1 ( ftp://ftp.rds.org.uk/pub/acrobat/s490e51.pdf ) P17 and P18 : 'The type 15B group is not allowed in the group sequence, type 15B groups are inserted automatically by the encoder as controlled with the TA control command when the TA flag for the main service changes.' Anyway, it is possible and defined in the UECP TA control command to set a continuous transmission of type 15B group. This point is conform since firmware version RDS1762N (FMX440).
The RDS configuration software doesn't work with my FMX480.
The FMB10 Encoder Utilities delivered with the DIGIPLEX software is only compatible with FMX410 (static RDS encoder). The RDS parameters of the FMX480 have to be set using UECP or ASCII protocols. The CONFSPB software can be used to edit and set the RDS configuration in UECP. In ASCII mode, any ASCII terminal connected to the port COM0 can be used (port settings are 9600,N,8,1).
Are Audemat encoders digital?
Yes, RDS encoders and Digiplexers are all digital. Their signals are generated digitally. Which means that the signals are constructed mathematically using DSP and then converted by a D/A converter into the analog form. RDS encoders (FMB series) use predefined signal tables stored in EPROMs. The Digiplexers use DSP algorithms and FIR Filters to encode Stereo, RDS and DARC functions.
How to configure the Digiplexer FMX480 to broadcast Radiotext?

1. Way to configure

You need :

  • A ASCII terminal connected to the port COM0 of the encoder (settings : 9600,N,8,1)
  • A Telnet connection to the encoder


2. Syntax

The syntax of all the ASCII command strings necessary for the configuration of the Digiplexer FMX480 can be found in the embedded Help Menu.

  • General access to the Help Menu : type HELP
  • Specific RDS Help Menu : type HELP.DSN or HELP.RDS.ENCODER


3. Configuration

3.1. To manage the DSN (Data Set Number)

The Digiplexer FMX480 can store 6 different complete RDS configurations.
Each configuration is called "DSN" (Data Set Number).
Each DSN includes static parameters (PSN = Program Set Number) and dynamic parameters settings.
The Digiplexer FMX480 allows to work on the configuration of a DSN and broadcast another DSN in the same time. If the settings of a DSN is modified and if this DSN is the current DSN (DSN.CURR), the changes are immediatly broadcasted.

ASCII commands
DSN Display DSN configuration for DSN 'D'

DSN=D		 Select Data Set 'D' for configuration. D=0-6. If DSN=0 : select the current DSN
DSN? Display the Data Set selected for configuration
DSN.CURR=D Select Data Set 'D' as the current Data Set to broadcast. D=1-6
DSN.CURR? Display the Current Data Set selected for broadcast


3.2. To create the Group Sequence (GS)

In order to broadcast the RDS services that feed your needs, you must configure the Group Sequence.

ASCII command
GS=g1,g2,... Set Group Sequence for DSN 'D'. g1,g2 are the RDS group

» Typical configuration to broadcast Radiotext : GS=0A,0A,0A,2A


3.3. To add a Radiotext to the DSN 'D'

ASCII commands
RT=n,t, For Data Set 'D', Enter radiotext after emptying buffer.
Broadcast TEXT n times, toggle A/B if t = 1 (n = 0-15,t = 0/1)
RT+=n,t, For Data Set 'D', add additional text. For each DSN, 6 different Radiotext lines (64 characters max / line) can be configured.
RT? Display Radiotext configuration for Data Set 'D'

» Typical configuration to broadcast 1 Radiotext (n = 0 means that this TEXT is broadcasted permanently) : RT=0,1,
» Typical configuration to broadcast 3 different messages in the Radiotext :
RT=10,1,
RT+=10,1,
RT+=10,1,

By exemple :
RT=10,1,
RT+=10,1,Now listenning to :
RT+=10,1, -
n = 10 means that each TEXT is broadcasted 10 times
The Radiotext is broadcasted recurringly. After the last message has been broadcasted 10 times, the first message is send again.

How to re-broadcast a Radiotext or any other specific RDS groups extracted from a MPX signal?

1. Principle

On a FM re-broadcasting site, you have a FM tuner (like Audemat's RXR1) with a multiplex (MPX) signal output. This multiplex signal coming from the tuner feeds the embedded RDS decoder (RDS IN on the rear panel) of the Digiplexer FMX480. On the other side of the Digiplexer FMX480, an external multiplex source feeds the main multiplex input (MPX IN). The expected RDS groups are "extracted" from the multiplex signal of the tuner and added as new RDS data to the main multiplex signal generated by the Digiplexer FMX480.

2. Way to configure

Two different ways to do:

  • A ASCII terminal connected to the port COM0 of the encoder (settings : 9600,N,8,1).
  • A Telnet connection to the encoder.


3. Syntax

The syntax of all the ASCII command strings necessary for the configuration of the Digiplexer FMX480 can be found in the embedded Help Menu.

  • General access to the Help Menu: type HELP
  • Specific RDS Help Menu: type HELP.RDS.ENCODER


4. Configuration

4.1. To select the RDS groups to re-broadcast

In order to filter and re-broadcast the RDS groups expected, you must apply a "Group Mask" over the decoded RDS signal.


4.1.1. Group Mask configuration

In order to filter and re-broadcast the RDS groups expected, you must apply a "Group Mask" over the decoded RDS signal.
This mask is applied with the command GROUPS=i

ASCII command
GROUPS=i Set groups retransmission i = 00000000 - FFFFFFFF

To calculate the hexadecimal value of "i", apply the following rules:
Each group you want to re-broadcast needs to be identified in the mask. "1" means the group is allowed by the mask.

RDS Groups 15B 15A 14B 14A 13B 13A 12B 12A 11B 11A 10B 10A ...
Value 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1

This gives an hexadecimal value for each stack of 4 Groups.

RDS Groups 15B 15A 14B 14A 13B 13A 12B 12A 11B 11A 10B 10A 9B 9A 8B 8A 7B 7A 6B 6A 5B 5A 4B 4A 3B 3A 2B 2A 1B 1A 0B 0A
Value 0 - F 0 - F 0 - F 0 - F 0 - F 0 - F 0 - F 0 - F

And finally a unique value for "i"

RDS Groups

15B 15A 14B 14A 13B 13A 12B 12A 11B 11A 10B 10A 9B 9A 8B 8A 7B 7A 6B 6A 5B 5A 4B 4A 3B 3A 2B 2A 1B 1A 0B 0A
Value 00000000 - FFFFFFFF


4.1.2. Exemples

» Typical configuration to re-broadcast static parameters and Radiotext (group 0A and 2A): GROUPS=00000011
» Typical configuration to re-broadcast group 0B: GROUPS=00000002


4.2. To activate the retransmission

ASCII command
RDS.IN=i i = 0 function OFF, i = 4 function active

» Typical configuration to activate the retransmission: RDS.IN=4

How to configure the PTY code and the Alternative Frequencies (AF) list ?

1. PTY :

  • DSN(d).PSN(p).PTY=x


    (Defines the PTY code of the program p in DataSet d. p=0 for the main program or a PSN n° defined for DataSet d)

    d=0,1,2,…6 and p=0 or a PSN n° defined for the DataSet d
    x=0 to 31 (see FAQ n°14 )

    or

    directly type PTY=x for main program PTY configuration

     



    • 2. AF list :

  • DSN(d).PSN(p).AF=a(1),a(2),…an


    (Defines the AF list for the program p defined in the DataSet d. p=0 for the main program or a PSN n° defined for DataSet d)

     

    d=0,1,2,…6 and p=0 or a PSN n° defined for the DataSet d
    For PSN Main : an max= 300
    For PSN EON : an max =90

    Values a(1), a(2), ..a(n) :
    a(1)=224 to 249 (defines the AF number in a list: 224=0 Alternative Frequency, 225=1 AF,…249=25 AF)
    a(2),a(3),..=88.0,..107.0, to 107.9 direct entry of the frequency.(or a(2),a(3),..=1 to 204 (encoding of the FM frequencies from 87.6 to 107.9) 250 for encoding the AFs in the AM bands)
    a(n-1)=205 fill value for lists having an even number of AFs
    a(n)= 0 (end of AF list).

    or

    directly type AF=a1,a2,…an for main program AF list configuration

    DSN(d).PSN(p).AF+= or AF+= will add new frenquencies in the AF list

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