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Synchronous FM Transmission and StereoTool
https://forums.stereotool.com/viewtopic.php?f=6&t=7933		 Page 4 of 5
Author:  vfoao0fq [ Thu Jun 14, 2018 7:31 pm ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
I have two transmitters on the same frequency within 15 miles of each other (SFN) with audio delivered to each TX site via an Internet stream (as no radio STL links are possible).

The transmitters have GPS timing inputs (10 MHz and 1 PPS) insuring carrier and pilot frequency lock, however there is currently no synchronization of the audio between the two sites, hence a poor listening experience. The transmitters have L/R analog, AES/EBU and composite (MPX on BNC connector) inputs.

My question: How might Stereo Tool be deployed in this scenario to synchronize the audio? One instance of ST running at each site? If "yes", how is the synchronization accomplished? That is, is the ST synchro function 'dynamic'; is it able to correct for 'drifting' time delay that might be caused by the nature of Internet packet delivery? Or (more likely) am I thinking about this from inside the box?

Thanks for any insight!
Author:  hvz [ Mon Jul 23, 2018 10:47 pm ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
Stereo Tool won't do this (SFN). But MicroMPX soon will!! Stand by.........

(Synchronization needs to be accurate below 1 microsecond. MicroMPX has GPS support - it works in the lab, so soon also in the released version).
Author:  sfregoso1 [ Thu Aug 02, 2018 8:22 pm ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
When you say, "Stereo Tool won't do this (SFN). But MicroMPX soon will!! Stand by........."

Are we talking about SFN/GPS sync of MicroMPX being supported in the SST software release?
Author:  veso266 [ Sat Jan 19, 2019 5:10 pm ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
could someone record what happens when trying out SFN in FM?
Unfortionaly I have no stations to try this on, because all are synchronized or don't use the same frequencies

maybe a drive from one TX to other so I can hear this sweat silence that everyone is talking about and I cannot experience it unfortunately
Author:  hvz [ Tue Jan 22, 2019 10:30 am ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
Quote:
When you say, "Stereo Tool won't do this (SFN). But MicroMPX soon will!! Stand by........."

Are we talking about SFN/GPS sync of MicroMPX being supported in the SST software release?
Yes. (Sorry, it hasn't been exactly "soon"). It's working in the lab here.
Author:  radiosean [ Sat Jan 26, 2019 6:30 am ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
Hans...I have 2 transmitters on a SFN that use uMPX. I was able to slightly delay one of them using the delay slider on the uMPX decoder, but it doesn't account for variations in travel time through the network. Is what you're testing going to allow the uMPX decoders to lock to GPS so they can be very precisely time-synchronized? If so, I'm very, very interested in this. I'd even be willing to test this in real world conditions if you need.
Author:  Mathijsco [ Sat Jan 26, 2019 10:08 am ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
Quote:
Is what you're testing going to allow the uMPX decoders to lock to GPS so they can be very precisely time-synchronized?
Yes!
Author:  radiosean [ Sat Jan 26, 2019 8:54 pm ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
Awesome...thanks Mathijs! Looking forward to this feature :D
Author:  veso266 [ Sun Jan 27, 2019 8:34 pm ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
can someone record there thests and upload them to youtube please, I would love to try that, but I have only 1 transmitter
Author:  hvz [ Sun Jan 27, 2019 10:15 pm ]
Post subject:  Re: Synchronous FM Transmission and StereoTool
Quote:
Hans...I have 2 transmitters on a SFN that use uMPX. I was able to slightly delay one of them using the delay slider on the uMPX decoder, but it doesn't account for variations in travel time through the network. Is what you're testing going to allow the uMPX decoders to lock to GPS so they can be very precisely time-synchronized? If so, I'm very, very interested in this. I'd even be willing to test this in real world conditions if you need.
We are going to need some best testers when this is ready...
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