Copyright © 2013 by Studio Technologies, Inc., all rights reservedwww.studio-tech.comUser GuideIssue 5, February 2013This User Guide is applicable for

Issue 5, February 2013 Model 220 User Guide Page 10 Studio Technologies, Inc. Additional Connector LocationsIn the world of broadcast and production

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 11Installation and SetupIn this section interconnections will be made usi

Issue 5, February 2013 Model 220 User Guide Page 12 Studio Technologies, Inc. headsets, which he did by the veritable “boatload.” Why? Because these

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 13Talkback OutputsThe talkback outputs are intended for connection to con

Issue 5, February 2013 Model 220 User Guide Page 14 Studio Technologies, Inc. only have one audio channel. In this case, audio will generally be on

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 15If both an IFB circuit and an external 24 volt DC source are connected,

Issue 5, February 2013 Model 220 User Guide Page 16 Studio Technologies, Inc. of the Model 220’s enclosure. For conve-nience, text and graphics on t

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 17Unfortunately, there’s no “perfect” gain setting that this guide can re

Issue 5, February 2013 Model 220 User Guide Page 18 Studio Technologies, Inc. Headphone Source SelectionSwitch assembly SW2 is used to config-ure the

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 19across the right side of their face, rather than the more-typical left

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Issue 5, February 2013 Model 220 User Guide Page 20 Studio Technologies, Inc. operating characteristics will change in “real-time” in response to co

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 21Two modes are available:• Push to talk: In this mode talkback out-put 2

Issue 5, February 2013 Model 220 User Guide Page 22 Studio Technologies, Inc. Auxiliary Relay Control ModeSwitch SW3-7 and SW3-8 configure the operat

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 23mode, and the level/balance mode is also selected, turning the balance

Issue 5, February 2013 Model 220 User Guide Page 24 Studio Technologies, Inc. In some applications it may be desirable for the output of the compres

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 25be provided by an IFB circuit, an external 24 volt DC power source, or

Issue 5, February 2013 Model 220 User Guide Page 26 Studio Technologies, Inc. Main Output vis-à-vis Talkback ActivityThis short section applies only

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 27• Hybrid: This mode is a combination of push to talk and alternate acti

Issue 5, February 2013 Model 220 User Guide Page 28 Studio Technologies, Inc. both the left and right channels. The bal-ance control, located on the

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 29Advanced OperationAdjusting the Line Input Trim PotsAs has been previo

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 3Table of ContentsIntroduction ...

Issue 5, February 2013 Model 220 User Guide Page 30 Studio Technologies, Inc. Technical NotesGrounding and ShieldingAs previously discussed in this

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 31IFB circuits “dry” (no DC) and differential (balanced). This would gain

Issue 5, February 2013 Model 220 User Guide Page 32 Studio Technologies, Inc. The resistors and the power source work together to provide 48 ±4 volt

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 33to connected devices such as the Model 220. However, unlike other produ

Issue 5, February 2013 Model 220 User Guide Page 34 Studio Technologies, Inc. This can be successfully done as long as several limitations are taken

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 35part number 0850-0114 specifies crimp terminals that are appropriate for

Issue 5, February 2013 Model 220 User Guide Page 36 Studio Technologies, Inc. Additional functions can be accessed using these 3-position headers:P

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 37P17: Pin 1 is connected to the common point of the Model 220’s circuitr

Issue 5, February 2013 Model 220 User Guide Page 38 Studio Technologies, Inc. labeled P10 provides access to auxiliary relay contact A. Header P9 pr

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 39associated printed circuit board to the enclosure. The interconnecting

Issue 5, February 2013 Model 220 User Guide Page 4 Studio Technologies, Inc. This page intentionally not left blank.

Issue 5, February 2013 Model 220 User Guide Page 40 Studio Technologies, Inc. the direct microphone output connector. These resistors provide isolat

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 41SpecificationsGeneral Audio:Frequency Response: 10 Hz-20 kHz, ±0.2 dB, m

Issue 5, February 2013 Model 220 User Guide Page 42 Studio Technologies, Inc. Appendix AAttached to the bottom of the unit is a security plate with

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 5IntroductionWhat This User Guide CoversThis User Guide is designed to as

Issue 5, February 2013 Model 220 User Guide Page 6 Studio Technologies, Inc. System FeaturesMicrophone InputA high-performance microphone preampli-fi

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 7is always used by the talkback outputs. In addition, the audio source fo

Issue 5, February 2013 Model 220 User Guide Page 8 Studio Technologies, Inc. The main button mode configures how the main output, when it is in the “

Model 220 User Guide Issue 5, February 2013 Studio Technologies, Inc. Page 9Audio Quality and ProtectionThe Model 220’s circuitry is carefully tai-l