Comments (14)
miegl
commented on August 18, 2024
You can't make a car switch to your station (thankfully).
The closest thing possible is to transmit on a freq that is in AF of some other station and as soon as that station looses signal the cars tuned to that particular station will (or should) switch to your station. For that to work though your stations PI must be matching the PI of the station.
But for that the other station must loose its signal (or at least the RDS reception has to get worse), which will probably involve jamming. And no, I wouldn't do that, even for "testing" purposes.
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Niall7459
commented on August 18, 2024
I want to build a relay of transmitters like so 1 pi transmits then PI2 recieves and re-transmits
HOME ) ) ) ) ) ) ) ) ) PI ) ) ) ) ) ) ) ) PI ) ) ) ) ) ) ) PI ) ) ) ) )))
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Niall7459
commented on August 18, 2024
But I need something to recieve FM for the other pis, and power and that would be cool
Except music might be out of sync slightly.
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miegl
commented on August 18, 2024
I would you use wifi ptp for that
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sm3ulc
commented on August 18, 2024
The normal way is to use RDS and AF-lists (alternative frequencies). Check
the RDS specification and add some rows to transmits the extra RDS-groups.
// David
…On Sun, Jan 21, 2018 at 12:11 PM, Josef Miegl ***@***.***> wrote:
I would you use wifi ptp for that
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miegl
commented on August 18, 2024
@sm3ulc Yeah I will add AF. This will not make the cars switch to a PiFmAdv station though, as @Niall7459 wants.
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commented on August 18, 2024
On Jan 21 2018, Josef Miegl wrote:
@sm3ulc Yeah I will add AF. This will not make the cars switch to a
PiFmAdv station though, as @Niall7459 wants.
https://en.wikipedia.org/wiki/Traffic_announcement_(radio_data_systems)
### Changing PS, RT and TA at run-time
You can control PS, RT and TA (Traffic Announcement flag) at run-time using
a named pipe (FIFO). For this run Pi-FM-RDS with the `-ct l` argument.
Example:
```
mkfifo rds_ctl
sudo ./pi_fm_rds -ctl rds_ctl
```
Then you can send "commands" to change PS, RT and TA:
```
cat >rds_ctl
PS MyText
RT A text to be sent as radiotext
TA ON
PS OtherTxt
TA OFF
...
```
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miegl
commented on August 18, 2024
TA will not make a car switch to your station from another station. It will only switch to your station if you are tuned to your station but using lets say CD player.
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sm3ulc
commented on August 18, 2024
Some documentation about the RDS system for reference:
https://www.iz3mez.it/wp-content/library/ebook/RDS%20-%20The%20Radio%20Data%20System.pdf (added working url)
Kind regards,
// David
Den 21 jan. 2018 17:57 skrev "Naich Roolz" <[email protected]>:
… On Jan 21 2018, Josef Miegl wrote:
> @sm3ulc Yeah I will add AF. This will not make the cars switch to a
> PiFmAdv station though, as @Niall7459 wants.
https://en.wikipedia.org/wiki/Traffic_announcement_(radio_data_systems)
### Changing PS, RT and TA at run-time
You can control PS, RT and TA (Traffic Announcement flag) at run-time
using
a named pipe (FIFO). For this run Pi-FM-RDS with the `-ct l` argument.
Example:
```
mkfifo rds_ctl
sudo ./pi_fm_rds -ctl rds_ctl
```
Then you can send "commands" to change PS, RT and TA:
```
cat >rds_ctl
PS MyText
RT A text to be sent as radiotext
TA ON
PS OtherTxt
TA OFF
...
```
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sm3ulc
commented on August 18, 2024
Yes and switching to another fq on TA is with EON. Not to confuse. :)
// David
Den 21 jan. 2018 18:00 skrev "Josef Miegl" <[email protected]>:
… TA will not make a car switch to your station from another station. It
will only switch to your station if you are tuned to your station but using
lets say CD player.
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sm3ulc
commented on August 18, 2024
Pretty broken url, trying again:
https://www.iz3mez.it/wp-content/library/ebook/RDS%20-%20The%20Radio%20Data%20System.pdf
// David
…On Sun, Jan 21, 2018 at 7:51 PM, David Lundberg ***@***.***> wrote:
Some documentation about the RDS system for reference:
https://www.iz3mez.it/wp-content/library/ebook/RDS%
2520-%2520The%2520Radio%2520Data%2520System.pdf&ved=
2ahUKEwiguNuA3OnYAhXEkiwKHajgBssQFjAJegQICBAB&usg=
AOvVaw0v97QQ3UraQUq5pV3Dnz7W
Kind regards,
// David
Den 21 jan. 2018 17:57 skrev "Naich Roolz" ***@***.***>:
> On Jan 21 2018, Josef Miegl wrote:
>
> > @sm3ulc Yeah I will add AF. This will not make the cars switch to a
> > PiFmAdv station though, as @Niall7459 wants.
>
> https://en.wikipedia.org/wiki/Traffic_announcement_(radio_data_systems)
>
> ### Changing PS, RT and TA at run-time
>
> You can control PS, RT and TA (Traffic Announcement flag) at run-time
> using
> a named pipe (FIFO). For this run Pi-FM-RDS with the `-ct l` argument.
>
> Example:
>
> ```
> mkfifo rds_ctl
> sudo ./pi_fm_rds -ctl rds_ctl
> ```
>
> Then you can send "commands" to change PS, RT and TA:
>
> ```
> cat >rds_ctl
> PS MyText
> RT A text to be sent as radiotext
> TA ON
> PS OtherTxt
> TA OFF
> ...
> ```
>
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub
> <#19 (comment)>, or mute
> the thread
> <https://github.com/notifications/unsubscribe-auth/ARdPKQzXucIiVBiC2fNMuyS-sM1ShQ5Vks5tM2xugaJpZM4RlZJ4>
> .
>
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sm3ulc
commented on August 18, 2024
Also, maybe worth to add in documentaion. This easy software by Oona is
very good for decoding/testing/analyzing RDS:
https://github.com/windytan/redsea
// David
…On Sun, Jan 21, 2018 at 7:51 PM, David Lundberg ***@***.***> wrote:
Some documentation about the RDS system for reference:
https://www.iz3mez.it/wp-content/library/ebook/RDS%
2520-%2520The%2520Radio%2520Data%2520System.pdf&ved=
2ahUKEwiguNuA3OnYAhXEkiwKHajgBssQFjAJegQICBAB&usg=
AOvVaw0v97QQ3UraQUq5pV3Dnz7W
Kind regards,
// David
Den 21 jan. 2018 17:57 skrev "Naich Roolz" ***@***.***>:
> On Jan 21 2018, Josef Miegl wrote:
>
> > @sm3ulc Yeah I will add AF. This will not make the cars switch to a
> > PiFmAdv station though, as @Niall7459 wants.
>
> https://en.wikipedia.org/wiki/Traffic_announcement_(radio_data_systems)
>
> ### Changing PS, RT and TA at run-time
>
> You can control PS, RT and TA (Traffic Announcement flag) at run-time
> using
> a named pipe (FIFO). For this run Pi-FM-RDS with the `-ct l` argument.
>
> Example:
>
> ```
> mkfifo rds_ctl
> sudo ./pi_fm_rds -ctl rds_ctl
> ```
>
> Then you can send "commands" to change PS, RT and TA:
>
> ```
> cat >rds_ctl
> PS MyText
> RT A text to be sent as radiotext
> TA ON
> PS OtherTxt
> TA OFF
> ...
> ```
>
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub
> <#19 (comment)>, or mute
> the thread
> <https://github.com/notifications/unsubscribe-auth/ARdPKQzXucIiVBiC2fNMuyS-sM1ShQ5Vks5tM2xugaJpZM4RlZJ4>
> .
>
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miegl
commented on August 18, 2024
@sm3ulc thanks for your recommendation. I have to (finally) buy some cheap rtl-sdr ;)
There's also another useful tool called RDS Spy (http://rdsspy.com/).
It's for Windows, but it runs jsut great under wine.
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miegl
commented on August 18, 2024
Ok, so finally I have done implementing AF ;) 25f7dc5
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