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Hello,
I am curious…we are interested in using Breakaway on our commercial FM station. However, I am not sure if I would put the computer running Breakaway at the transmitter site, or studio? Here is our chain, we dont use a typical STL – instead we use IP STL using Barix In / Exstreamer codec’s over 900 mhz wireless ip point to point connection.
Current setup:
Studio/Automation Computer –> M-Audio 192 Soundcard out –> Barix Xstreamer codec —> Nanobride M9 IP Transmit —> Nanobridge M9 Ip Receiver —> Barix Instreamer codec —-> Broadcast Works BW-600 FM transmitter.
Can we put breakaway in the studio site, and send the processed audio over the IP connection without losing quality? Something like this:
Breakway At Studio setup:
Studio/Automation Computer –> M-Audio 192 Soundcard out –> PC running Breakaway w/ M-Audio 192 soundcard in & out –> Barix Xstreamer codec —> Nanobride M9 IP Transmit —> Nanobridge M9 Ip Receiver —> Barix Instreamer codec —-> Broadcast Works BW-600 FM transmitter.
Or am I stuck with the PC running breakaway at the transmitter site, looking like this:
Breakway At transmitter site setup:
Studio/Automation Computer –> M-Audio 192 Soundcard out –> Barix Xstreamer codec —> Nanobride M9 IP Transmit —> Nanobridge M9 Ip Receiver —> Barix Instreamer codec —-> PC running Breakaway w/ M-Audio 192 soundcard in & out –> Broadcast Works BW-600 FM transmitter.
I would put the Breakaway at the xmtr. But you may try it at the studio using L/R into the Barix not composite and on the xmtr end feed the L/R input on the xmtr and use the xmtr mpx.That should work fine . I just like any processing done at the xmtr. Hope you’re not using mp3 on that Barix.
At my station, we go automation/Breakaway Broadcast>console>twisted pair (don’t ask- sometimes you have to go with what you have)>STL>Synetrix Airtools 2M (not my choice, see above)>exciter>transmitter
For what we have in the chain, it sounds crystal clear and clean
AT transmitter site, period.
– Choose good PC components, make some remote connection (rd, vnc, tw, etc..)
– Measure, or find someone to measure for You mpx level from transmitter 75khz ..Ideally the Breakaway computer will be the last thing before your transmitter.
Your Barix link can only carry L/R audio and if processed before the STL, due to lossy encoding (MP3) the output signal at the other end will not be identical and will contain overshoots.
By using the Breakaway processing at the transmitter end, you can feed the final MPX from the Breakaway PC (including RDS if you purchase Airomate) straight into the MPX input of your transmitter. This will give you the perfect configuration.
Ideally the Breakaway PC should be at the TXer site for lessening the chances of artifacts slipping in after your processing. But it can get hammered by RF too so don’t put it any closer than you have too.
The link you are using should be A OK I’d look at the protocaols used on the Barix boxes. Using them to "stream" via the IP link isn’t the best. Streaming means your live talent will not like monitoring off air due to the delay. Plus mp3 is tossing stuff away. You need to use a protocol that is linear. I think RTP is it for barix. But there is a down side and that is RTP doesn’t like network jitters.
The point missed by every one when putting the audio processing at the TXer site is the link can still get over driven. There needs to be a form of peak limiting at the front of the stl before just so you can’t over drive the link – nothing more! The realwork is done by breakaway at the site.
[quote author=”stationx”]Ideally the Breakaway PC should be at the TXer site for lessening the chances of artifacts slipping in after your processing. But it can get hammered by RF too so don’t put it any closer than you have too. [/quote]
i know this problem with "HF INSLAG" only @ dutch pirates xD
so my opinion is, it´s important to run bbp @transmitter.
when you run bbp at the studio and send l/r audio over ip-stl, which is not pcm,
you will loose audio quality and loose peak controll.please correct me if it´s wrong
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