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Dual STL switching

M

masterphreak

I'm looking for a solution to switch between 2 separate incoming STL receivers at my transmitter site. Currently studio is located in one location and I would like the ability once the studio is located in it's new home to be able to switch the STL receiver that is on-air remotely from either studio and also see the current status of which one is on-air. It would also need to have mix-over capability.

Keep in mind I want this to be as simple as possible and be able to be triggered via commands on my automation system or surface mount buttons.

I will have IP connectivity between all 3 locations.

How would you solve this?
 
masterphreak said:
I'm looking for a solution to switch between 2 separate incoming STL receivers at my transmitter site. Currently studio is located in one location and I would like the ability once the studio is located in it's new home to be able to switch the STL receiver that is on-air remotely from either studio and also see the current status of which one is on-air. It would also need to have mix-over capability.

Keep in mind I want this to be as simple as possible and be able to be triggered via commands on my automation system or surface mount buttons.



I will have IP connectivity between all 3 locations.

How would you solve this?
Click to expand...

Is your audio output composite or AES? There are several devices that will inexpensively do what you want, with the exception of the overlapping or mixing the audio part. Switching it via GPO from your remote control or a dial up device is super simple.
 
It will be using composite analog output from the back of the STL receiver. I would just use a Broadcast Tools 4.1 switcher since they have mixer capabilities, but they don't have a composite audio input.
 
I doubt that you will find any product which can mix two composite signals. Matching the stereo pilot and subcarrier frequencies, amplitudes and phases would be very difficult.
A hard switch between the two composite signals would be much simpler.
Sorry that I don't have a better solution for you.
 
Yeah, it's not a deal breaker to not have the mix over functionality. Looks like Broadcast Tools makes a 2 channel composite switcher which will work for this application.

Does anyone know of a inexpensive device that will convert a composite signal back to an analog balanced stereo pair?
 
Nothing which is inexpensive.
If you need accurate (flat) audio output, you will need an FM stereo (modulation) monitor.
If you have some technical ability and don't need accurate audio output, you can always purchase an FM stereo tuner and modify it to accept the composite signal at the input of the multiplex section of the tuner.
 
Yah... "inexpensive" is the deal breaker, but it can be done.

The 'Broadcast Devices' CTD-300 will convert composite to EAS or analog L/R

Price is around $1,200.
 
Broadcast Tools makes (used to) a composite to analog de-modulater. Unfortunately I don't see it on their website. It may have been discontinued.
 
stl switching/mixing

Sounds like a job for a BDI product... They have composite mixer/DA's a bunch of various switching gear.
http://www.broadcast-devices.com/AudioProducts.html

masterphreak said:
I'm looking for a solution to switch between 2 separate incoming STL receivers at my transmitter site. Currently studio is located in one location and I would like the ability once the studio is located in it's new home to be able to switch the STL receiver that is on-air remotely from either studio and also see the current status of which one is on-air. It would also need to have mix-over capability.

Keep in mind I want this to be as simple as possible and be able to be triggered via commands on my automation system or surface mount buttons.

I will have IP connectivity between all 3 locations.

How would you solve this?
Click to expand...
 
Mixing two composite signals is a very complex process.
Both 19kHz stereo pilot frequencies (and the L-R stereo subcarriers) must be locked in phase AND frequency.
That means a complete reconstruction of the stereo composite baseband signal.
Nobody manufacturers a device which can do that.
If you need to mix between two stereo composite signals, you will need to de-modulate both signals, mix them and then feed the L and R channels to a stereo generator.
The whole process would be very expensive.
Switching the composite audio from A to B would be simple.

That's my two-cents worth.
 
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