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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 3: GUIDED TOUR of the HARDWARE 34

XLR PIN FUNCTION TRS PIN

1 Ground S

2

Audio + T

3 Audio - R

Theanalogaudioinputshavethefollowingcharacteristics:

• Activebalanced

• Linelevel:AmenuselectionLevelIn,intheAUDIOmenu,allowsselection

forConsumerorProlevels.Thenominalinputlevelisjumpersettableon

theaudioboard(SeeSection13.1)toallowthefollowingnominallevels:

JUMPER SETTING

(J10)

Menu Setting:

Professional

Menu Setting:

Consumer

*Pins 1/2 and 5/6 +4 dBu nom. (+22 clip) -11 dBu nom. (+7 clip)

Pins 2/3 and 4/5 0 dBu nom. (+18 clip) -15 dBu nom. (+3 clip)

* Factory default setting

• Headroom:18dBabovenominal

• Bridging≥10Kohmimpedance

Ananalogsoftclipperisincludedtoallowmaximumdynamicrange,whilestillprotectingthe

userfromoverloadingtheA/Dconverterifinputsignalexceedthesevalues.

Theinputsaredesignedtobesourcedfrombalanced,linelevel,s

ignals.Olderequipment,with

atransformeroutputstage,mayneedaterminatingresistor(usually600ohms)acrosspins2

and3,consultthemanualforyourequipmentforhowtouseitwithhighimpedanceinputs.

Unbalancedsourcesmaybeusedbyconnectingpins3tothesourcegroundwhilethesignal

highisconn

ectedtopin2.Werecommendleavingpin1(ground)unconnected,asthis

arrangementwillpreventthepossibilityofgroundloops.

h

HOT TIP!

Xstreams with Stereo Audio boards prior to Rev G (1401-0009-007) can handle unbalanced

signals at -11dBu or -15dBu only (see jumper settings, above).

The Level In selection in the AUDIO menu should be set to PRO in this case. The Gain Trim

selection in the AUDIO menu should be increased until proper levels are observed on the

Send meters.

Later version mother boards allow both -11/15dBu (Consumer setting) or 0/+4dBu (Pro

setting) unbalanced signals.

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