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active microphones. While the automatic “mic kill” signal will apply to many user devices it may not apply to all. Muting microphones is significant as obtaining a “deep” null requires that no extraneous signals be present on the intercom circuit.
Advanced
Operation
The Model 46 allows several of the operat- ing parameters to be configured to meet the needs of specific applications. The following paragraphs provide details about the auto terminate disable and factory test modes.
Auto Terminate Disable
As previously discussed in this user guide, the auto terminate function can come into play when a
18 volts DC is not detected on either pin,
200 ohm terminating networks are applied to those same pins. This ensures that the Model 46’s hybrid circuitry remains stable, preventing objectionable audio signals from being sent to the
As a visual aid, LEDs on the front panel will display the DC power status of pins
2 and 3. But when auto terminate disable mode is active the LEDs will no longer indicate the intercom circuit’s termination status.
For special externally powered
3.But whether or not either or both LEDs are lit, the Model 46 will never apply 200 ohm terminations to pins 2 or 3. For the hybrid circuits to remain stable termina- tion impedances must be provided by the connected circuits. If these are not pres- ent one should expect the hybrid circuits to generate a very impolite noise. This condition, caused by the
In conclusion, it’s important that technical personnel working with the Model 46 be informed when the auto termination func- tion has been disabled. They will then be aware of the potential noise issues and be ready to make corrections should a prob- lem arise.
Model 46 User Guide | Issue 2, September 2007 |
Studio Technologies, Inc. | Page 25 |