Working with the Inovonics 222 audio processor
This type of equipment should have a balanced in/out connec- tion, you will not need the audio AM1000pr adapter.
Connections for balanced audio in. These con- nections should be the same for other audio processors.
From the audio source, if the connector is an XLR connector you would use pins 2&3. Pin 1 is ground, don’t use that. If the connector for the balanced audio to the 222 is a 1/4” stereo jack use the tip and ring con- nections, again don’t use the ground (sleeve).
The goal here is to get the proper level to the input of the 222 and to the transmitter.
Input: Connect your audio source as explained. You should be able to see some indication on the Peak limit and Pre - emphasis LED indicators as you adjust the input gain. Be sure they are on. If you cannot get any indication with the input gain all the way up then remove the cover (with the 222 unplugged) and set the (input range select) to the low position (marked L on the board). You should be able to get an indication now, if not check to see if you have an input signal.
Once you have the audio material showing on the indicators, then try to connect the trans- mitter. Depending on where the audio gain is on the transmitter unit you may or may not be able to get good sound at this point. If you cannot get good sound in the entire range of the 222 output level control then check the transmitter audio gain, it should be 1/2 to fully clockwise, it is preferable not to have it lower then 1/2 way. If you are way over driven try turning the transmitter audio gain down a bit, you may need to turn it down to almost off if you are getting to much drive from the 222. Adjust 222 output level and Transmitter level for good sound from a test radio. Be careful about having a radio to close to the transmit- ter, it can be overloaded. Try to get the audio level as high as you can.
If you have a unbalanced input signal to the 222 (hot and ground, single wire with shield) then connect the ground or shield of the input signal cable the the ground input, the (+) 222
input terminal goes to your center conductor. Connect the | |
Don't solve the gain problem by just turning down the input control, you will get good |
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sound but the 222 will not operate properly. You should be able to see the lights come on |
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as the music peaks if you have the limit and/or pre emphasis controls on. |
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Balanced audio is two twisted wires, the signal exists as a difference voltage between the |
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two wires. There is no ground. If there is a ground, it is there just for shielding. | 9 |
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