Gentner SPH10 User manual

SPH10
Installation and
Operations Manual

© Copyright 1997 Gentner Communications Corporation. All rights reserved. No part of this manual may be
reproduced in any form or by any means without written permission from Gentner Communications Corporation.
Printed in the United States of America. Original version, 5/97. Gentner Communications Corporation reserves
specification privileges. Information in this manual is subject to change without notice.
SPH10 Installation and Operations Manual
Gentner Part No. 800-012-201 (Rev. 1.1)
October 1997
Manual Development: Bill Kilpack
Artwork and IIlustrations: Jim Wright, Bill Kilpack
Copyright
Information
This equipment complies with the requirements of the EU guidelines:
89/336/EEC “Electromagnetic Compatibility”
73/23/EEC “Electrical operating material for use within specific
voltage limits”
Conformity of the equipment with the above guidelines is attested by the CE mark.
Gentner Communications Corporation is committed to protecting the environment
and preserving our natural resources.
This manual has been printed entirely on recycled paper.

Contents
SPH10 Installation and Operations Manual Page iii
TechnicalorSetup Assistance
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Introduction 1
Warranty Registration 1
Unpacking 1
Features and Benefits 2
Product Description 2
Front-Panel Controls 2
Rear-Panel Connectors 3
Before You Install 4
Power Requirements 4
Telephone Line Requirements 4
Equipment Placement 4
Installation 4
Completed Installation 4
Step 1 — Telephone Connections 4
Step 2 — Back-Panel Connections 5
Step 3 — Power Connection 5
Mix-Minus 5
Separate Mix Channel 5
Internal Mix Bus 5
“Build Your Own” Mix-Minus 6
Discrete Microphone Mixer 6
One Channel Send 6
Operational Features 6
Remote ON/OFF Control 6
Mic/Line Select 6
Calibration 7
Step 1 — Trim Pot Levels 7
Step 2 — Caller Adjustment 7
Step 3 — Send Adjustment 7
Operation 8
Answering a Call 8
Making a Call 8
Disconnecting a Call 8
Remote Control Option 8
Recording Option 8
When Not in Use 9
Specifications 10
Warranty 11
FCC Part 15 Compliance 12
FCC Part 68 Compliance 12
IC Compliance 13

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Safety Information 13
BABT Recording Requirements 14
Appendix A: Connector Pinouts 15
Appendix B: Schematics 16
Contents continued
List of Figures
Figure 1. Equipment diagram 1
Figure 2. SPH10 front-panel controls 2
Figure 3. SPH10 back-panel connectors 3
Figure 4. SPH10 back-panel connectors 4
Figure 5. Typical SPH10 installation 4
Figure 6. RJ11C telephone-line connector 4
Figure 7. Remote DB25 connector 5
Figure 8. Send In audio female XLR connector 5
Figure 9. Caller Out audio male XLR connector 5
Figure 10. Aux Out audio male XLR connector 5
Figure 11. SPH10 monitor RCA jack 5
Figure 12. SPH10 power module 5
Figure 13. SPH10 dip switches 6
Figure 14. SPH10 front-panel controls 7
Figure 15. SPH10 trim-pot locations 7
Figure 16. SPH10 front-panel controls 8
Figure 17. Two typical recording configurations 9
Table 1. Remote ON/OFF Dip Switch Settings 6
Table 2. Mic/Line Select Dip Switch Settings 6
Table 3. Remote Connector Pinout 15
Table 4. Line Connector Pinout 15
Table 5. Set Connector Pinout 15
List of Tables

SPH10 Installation and Operations Manual Page 1
Technical orSetup Assistance
Telephone:[phone] (USA)or 801.975.7200 (worldwide) •Worldwide Web @ http://www.gentner.com
Congratulations on purchasing the SPH10 Analog Hybrid. The SPH10 uses the
latest technology to provide high quality telephone-interface equipment. The
SPH10 is designed to interface incoming telephone calls to your audio
equipment.
The SPH10 is a single analog hybrid, allowing connection of a single external
telephone line for on-air use. When coupled with adherence to compliance
standards in the United States, Canada, the United Kingdom and mainland
Europe, the SPH10 is optimal for your telephone application.
This manual explains how to install, set up and operate the SPH10 in a step-by-
step format. It also supplies instructions on how to resolve technical problems,
should any arise.
If you need any additional information on how to install, set up or operate your
system, please contact us at Gentner Communications at the location noted
below. We welcome and encourage your comments so we can continue to
improve our products and serve your needs.
Gentner Communications Corporation
1825 Research Way
Salt Lake City, UT 84119
TEL: Worldwide 801.975.7200 In U.S.A. 800.945.7730
FAX: Worldwide 801.977.0087 In U.S.A. 800.933.5107
FAX-On-Demand 24-Hour Information Service 800.695.8110
FAX-On-Demand International Line 801.974.3661
Worldwide Web Page @ http:\\www.gentner.com
Warranty Registration
Please register your SPH10 by completing the self-addressed, postage
prepaid warranty registration card and return it to Gentner
Communications by mail. You may also FAX it to the above listed fax
number or call Gentner Communications. When your product is properly
registered, Gentner Communications will be able to serve you better should
you require technical assistance or desire to receive upgrades, new product
information, etc.
Ensure that the following items (See Figure 1, below.) were received with your
shipment:
Introduction
SHIPPING NOTE:
Gentner Communications is not responsible for product damage incurred during
shipment. You must make claims directly with the carrier. Inspect your shipment
carefully for obvious signs of damage. If the shipment appears to be damaged,
retain the original boxes and packing material for inspection by the carrier.
Contact your carrier immediately.
Unpacking
Figure 1. Equipment diagram

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Optical telephone interface
Analog filter minimizes hum and Central Office switching noise
Push-button volume control on front panel
Remote ON/OFF control via rear-panel connection
Analog send filter/limiter for telephone line-noise reduction
1W power amp (no need for headsets on guests or talent)
Balanced inputs and outputs
Downstream mixing capability
Compatible with any telephone system
RF interference will not affect performance
Simple installation and operation (no special equipment required)
The SPH10 provides superior analog telephone integration into broadcast
applications. It contains a new optical telephone interface. The SPH10 also
provides easy control of volume levels through front-panel push buttons.
Front-Panel Controls
The SPH10 front-panel controls (See Figure 2, below.) perform the following
functions:
Product
Description
Features and
Benefits
1. Send In. This trim pot adjusts the level of the send audio onto the phone
line. At its midpoint, 12 o’clock, the trim pot is set for nominal send level
(0dBm).
2. AUX Send. This trim pot will adjust the level of the aux send onto the
telephone line. At its midpoint, 12 o’clock, the trim pot is set for a nominal
level (0dBm).
3. AUX Out. This trim pot will adjust the level of the audio on the AUX
OUT connector. At its midpoint, 12 o’clock, the trim pot is set for nominal
caller level (0dBm).
4. Caller Out. This trim pot controls the caller level to the user equipment.
At its midpoint, 12 o’clock, the trim pot is set for nominal caller level
(0dBm).
5. Dip Switches. Four active dip switches (1, 3, 4, 12) configure the SPH10
system. Individual switch functions are defined in Operational Features
(Page 6).
Figure 2.SPH10 front-panel controls

SPH10 Installation and Operations Manual Page 3
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6. Volume. Volume. These up/down buttons control the audio level of the
MONITOR amplifier.
7. On LED. This LED indicates the hybrid’s ON state. The LED will
illuminate green when the hybrid is in the ON state.
8. Off LED. This LED indicates the hybrid’s OFF state. The LED will
illuminate red when the hybrid is in the OFF state.
9. On. The ON switch (momentary), connects the hybrid to the telephone
line.
10. Off. The OFF switch (momentary), disconnects the hybrid from the
telephone line and mutes all audio.
Rear-Panel Connectors
1. Power. The AC power cord input (See Figure 3, below.) is a NEMA type
connector allowing use of premolded domestic US power cords as well as
various other premolded international power cords.
2. Remote. This DB25 female connector provides parallel control and status
of the hybrid.
3. Monitor Out. This quarter-inch phone jack provides a 1W amplified
caller audio signal for monitoring.
4. Send In. This balanced, female 3-pin XLR input must be a mix-minus
feed.
5. Caller Out. This balanced, male 3-pin XLR output contains caller audio
only.
6. Aux Out. This balanced, male 3-pin XLR output contains caller audio
mixed with send.
7. Line. This RJ11 connector provides connection of the telephone line to
the hybrid.
8. Set. This RJ11 connector allows connection to a standard analog
telephone set. Tip and ring from the phone line are present at this connector
when the hybrid is in its OFF state. Tip and ring from the phone line are not
present at this point when the hybrid is in its ON state.
Figure 3. SPH10back-panelconnectors

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Power Requirements
The SPH10 automatically accommodates voltage requirements of 100–
240Vac, 50/60Hz, no switching required.
Telephone Line Requirements
The SPH10 models operate on standard telephone lines and connect to the
telephone system with a standard RJ11C modular jack. If you do not have an
RJ11C jack where you want to install your SPH10, call your telephone
company for installation.
DRY LINE NOTE:
The SPH10 will not operate with telephone dry Telco lines.
Equipment Placement
The SPH10 models are designed for installation into a standard 19-inch
equipment rack.
The SPH10 models are designed for easy installation and setup. All necessary
interface connections are made through rear-panel connectors. This makes for
easy installation, removal and, if necessary, service. Refer to SPH10 back-panel
connections (See Figure 4, below.) for a description and placement of each of the
connections you will be making. Each connection is numbered for easy
identification.
Completed Installation
The block diagram below (See Figure 5, below.) illustrates a typical SPH10
interconnection.
Installation
Before You
Install
To install your SPH10, follow these step-by-step instructions:
Step 1 — Telephone Connections
SPH10
Line. Plug your telephone line into the RJ11C LINE jack [7] (Figure 6, left).
Set. Plug your telephone set into the RJ11C SET jack [8].
Figure 6. RJ11Ctelephone-line connector
Figure 4. SPH10back-panelconnectors
Figure 5.Typical SPH10installation

SPH10 Installation and Operations Manual Page 5
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Step 2 — Back-Panel Connections
Remote Control
If using a remote control for parallel control and hybrid status, plug it into
the DB25 REMOTE connector [2] (Figure 7, left). For pinouts, see
Appendix A: Connector Pinouts (Page 13).
Send In
Connect the SEND IN female XLR plug [5] (See Figure 8, left.) to the studio
console. This is balanced line-level audio.
Caller Out
Connect the SPH10’s CALLER OUT audio output to an input on your audio
console [5] (Figure 9, left). This male XLR socket’s audio must contain a
mix-minus.
Aux Out
Connect his male XLR connector [6] (See Figure 10, left, bottom.) to your
recording device. This connector contains caller audio only. Select the AUX
Mix dip switch to create a mix of send and caller on this connector.
Monitor Out
Connect a speaker output feed to this quarter-inch TRS jack [3] (See Figure
11, left.) to monitor a 1W-amplified caller signal.
Step 3 — Power Connection
The power cord [1] (See Figure 12, left.) will operate at any level between
100–240Vac, 50–60Hz.
Mix-minus refers to the audio that must be sent to callers to prevent feedback on
the audio system through the hybrid. Mix-minus is a mix of all audio on the
console, minus the caller’s audio. Without a mix-minus feed, the caller audio
appearing on the console will be sent back to the caller, where it will be
retransmitted to the studio via the caller’s telephone. This feedback can create
anything from echo to a howling squeal. Many broadcast consoles provide a mix-
minus feed via a telephone module.
When using the SPH10 with mix-minus, there are several ways of going about
generating external mix-minus. If a mixing console is used to feed the SPH10’s
SEND input, the audio going down the line must not contain any caller audio.
There are five ways to accomplish this: separate mix channel, internal mix bus,
“build your own” mix-minus, discrete microphone mixer and one-channel send.
Separate Mix Channel
If the console has an extra mixing output channel, use this channel to mix all
the audio you want to send to the SPH10 except the channel that will be
connected to caller audio.
Internal Mix Bus
Mix-minus refers to a sum of all the audio sources in the console minus the
caller audio. Many console manufacturers provide this feature as a telephone
module.
Figure 7.Remote DB25 connector
Figure 12. SPH10power module
Mix-Minus
Figure 11. SPH10monitor RCA jack
Figure 8. SendIn femaleXLRconnector
Figure 9. CallerOut male XLR connector
Figure 10. AuxOut male XLR connector

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Remote ON/OFF Control
Dip switch 3 (See Figure 13, left.) determines the type of external control
used to turn the hybrid ON and OFF (Table 1, below).
Operational
Features
“Build Your Own” Mix-Minus
You can build your own mix-minus by externally summing all audio sourced
to be sent to the caller.
Discrete Microphone Mixer
If only microphone audio will be sent down the line, a separate microphone
mixer (such as the Gentner MPAII Mixer/Power Amplifier) may be utilized.
This audio can then be sent to the SPH10’s SEND input as well as the
console input.
One Channel Send
If a single-source audio will be sent to the caller (i.e. from a microphone),
simply use the line-level output from the microphone preamplifier.
Mix-Minus
Continued
Table 1. Remote ON/OFF Dip Switch Settings
Dip Switch Position Description
3 ON (UP) Momentary
3 OFF (DOWN) Latching
Mic/Line Select
Dip switch 4 determines the SEND input’s gain. When this dip switch is
selected, the input will provide 55dB of gain to provide for an external
microphone connection (Table 2, below).
Table 2. Mic/Line Select Dip Switch Settings
Dip Switch Position Description
4 ON (UP) +55dB (Mic)
4 OFF (DOWN) 0dB (Line)
Figure 13. SPH10dip switches