RTS IFB-828 User manual

User Instructions
IFB-828
IFB Interface
9300-7094-000 Rev G, 03-2003

2
PROPRIETARY NOTICE
The RTS product information and design disclosed herein
were originated by and are the property of Telex Communi-
cations, Inc.Telex reserves all patent, proprietary design,
manufacturing, reproduction, use and sales rights thereto,
and to any article disclosed therein, except to the extent
rights are expressly granted to others.
COPYRIGHT NOTICE
Copyright 1997 by Telex Communications, Inc. All rights
reserved. Reproduction in whole or in part without prior
written permission from Telex is prohibited.
UNPACKING AND INSPECTION
Immediately upon receipt of the equipment, inspect the
shipping container and the contents carefully for any
discrepancies or damage. Should there be any, notify the
freight company and the dealer at once.
WARRANTY INFORMATION
RTS products are warranted by Telex Communications,
Inc. to be free from defects in materials and workmanship
for a period of three years from the date of sale.
The sole obligation of Telex during the warranty period is to
provide, without charge, parts and labor necessary to
remedy covered defects appearing in products returned
prepaid to Telex.This warranty does not cover any defect,
malfunction or failure caused beyond the control of Telex,
including unreasonable or negligent operation, abuse,
accident, failure to follow instructions in the Service Manual
or the User Manual, defective or improper associated
equipment, attempts at modification and repair not
authorized by Telex, and shipping damage. Products with
their serial numbers removed or effaced are not covered by
this warranty.
To obtain warranty service, follow the procedures entitled
"Procedure For Returns" and "Shipping to Manufacturer for
Repair or Adjustment".
This warranty is the sole and exclusive express warranty
given with respect to RTS products. It is the responsibility
of the user to determine before purchase that this product
is suitable for the user's intended purpose.
ANY AND ALL IMPLIEDWARRANTIES, INCLUDING
THE IMPLIED WARRANTY OF MERCHANTABILITY ARE
LIMITED TO THE DURATION OF THIS EXPRESS
LIMITED WARRANTY.
NEITHER TELEX NOR THE DEALER WHO SELLS RTS
PRODUCTS IS LIABLE FOR INCIDENTAL OR CONSE-
QUENTIAL DAMAGES OF ANY KIND.
CUSTOMER SUPPORT
Technical questions should be directed to:
Customer Service Department
RTS/Telex,
2550 Hollywood Way, Suite 207
Burbank, CA 91505 U.S.A.
Telephone: [phone]
Fax: [phone]
RETURN SHIPPING INSTRUCTIONS
PROCEDURE FOR RETURNS
If a repair is necessary, contact the dealer where this unit
was purchased.
If repair through the dealer is not possible, obtain a
RETURN AUTHORIZATION from:
Customer Service Department
Telex Communications, Inc.
Telephone: [phone]
Fax: [phone]
DO NOT RETURN ANY EQUIPMENT DIRECTLY TO THE
FACTORY WITHOUT FIRST OBTAINING A RETURN
AUTHORIZATION.
Be prepared to provide the company name, address,
phone number, a person to contact regarding the repair,
the type and quantity of equipment, a description of the
problem and the serial number(s).
SHIPPING TO MANUFACTURER FOR REPAIR OR
ADJUSTMENT
All shipments of RTS products should be made via United
Parcel Service or the best available shipper, prepaid.The
equipment should be shipped in the original packing
carton; if that is not available, use any suitable container
that is rigid and of adequate size. If a substitute container
is used, the equipment should be wrapped in paper and
surrounded with at least four inches of excelsior or similar
shock-absorbing material. All shipments must be sent to
the following address and must include the Return Authori-
zation.
Factory Service Department
Telex Communications, Incorporated
8601 E. Cornhusker Hwy
Lincoln, NE 68505 U.S.A.
Upon completion of any repair the equipment will be
returned via United Parcel Service or specified shipper
collect.

3
Contents
PROPRIETARY NOTICE ..................................................................................................... 2
COPYRIGHT NOTICE ......................................................................................................... 2
CUSTOMER SUPPORT ...................................................................................................... 2
1 IFB-828 Description......................................................................................................... 4
2 Installation in an RTS Digital Matrix .............................................................................. 4
3 Using the IFB-828 as a Simple ....................................................................................... 4
4 Program Interface with 4020 and4030 Belt Packs........................................................ 6
5 IFB-828 Mechanical Assembly Parts ............................................................................. 8
6 IFB-828 PC Board Electrical Parts ................................................................................. 8

4
1 IFB-828 Description
The IFB-828 interfaces up to eight RTS Systems’ Model
IFB-325, 4020, or 4030 IFB Belt Packs to any RTS Digital
Matrix Intercom System, and it provides power to the
beltpacks.
The IFB-828 may also be used as a simple program
interface to feed two separate program sources to each of
eight 4020 or 4030 belt packs (16 program sources to eight
belt packs total).
2 Installation in an RTS Digital Matrix
1 Mount the IFB-828 in an equipment rack or bay. It
should be positioned near eye height when sitting or
standing to permit adjustment of the IFB program
levels and to check the power indicator lights. There
are no special ventilation requirements.
☞IFB-828 Location: The XLR connector outputs from
the IFB-828 provide unbalanced audio and DC
operating power to IFB belt packs.Therefore, very
long cable runs (over several hundred feet) from the
IFB-828 to the belt packs may result in diminished
performance due to DC resistance in the cabling and
noise induced by surrounding equipment. Select a
location for the IFB-828 that is as close as possible to
the belt packs, or use appropriate precautions
(shielded cable, heavier gauge stranded wire, routing
away from unshielded equipment, etc.) For broadcast
applications you will typically locate the IFB-828 in the
audio booth near the talent location, and no special
precautions are required.
2 Set the voltage selector switch on the back panel:
Select 110 for 110/120 V, 50/60 Hz operation
Select 220 for 220/240 V, 50/60 Hz operation
3 Connect a 25-pair telco cable to J9 on the back of the
IFB-828. Run this cable back to the audio distribution
point for the intercom system (punch blocks etc.).
4 Setup the IFB’s at the digital matrix intercom system
using the intercom system configuration software:
☞CSedit Users: see “Creating an IFB” in Section 2 of
your CSedit User Manual. For each IFB, note which
intercom port you have setup as the IFB output port.
You define this port in the IFB Out column of the
Interrupt Foldback Bus Assignments table. Also note
which intercom port you have setup as the Program
Input port.You define this port in the Def Inp column
of the table.
☞ADAMedit Users: select the IFB button on the
ADAMedit toolbar, then double-click on an IFB to
open the Edit IFB dialogue window for that IFB. For
each IFB that you setup, note which intercom port
you have set as the IFB output port in the Output text
box or list box. Also note which intercom port you
Figure 1. IFB-828 Reference View

5
have setup as the Program Input port in the Input text
box or list box.
5 Once you have configured the required IFB’s, also be
sure to assign them to keypanel keys:
☞CSedit Users: see “Keypanel Setup” in Section 2 of
your CSedit User Manual.
☞ADAMedit Users: select the KP button on the toolbar,
then press F1 to get help on keypanel setup.
6 For each IFB that you setup:
a. Connect from the output port of the matrix (that
you defined in step 4) to an available IFB input of
the IFB-828. Make the connections at the audio
distribution point where you have connected the
cable from J9 of the IFB-828. See Table for pin
numbers.
b. Connect the IFB program audio source both to the
intercom port that you defined as the program
input port of the matrix (in step 4) AND also
connect the IFB program audio source to the
direct program input of the selected channel of
the IFB-828.
7 Connect from the appropriate 3-pin XLR output
connector of the IFB-828 to the LINE ( or LINES )
connector of the IFB belt pack.Typical cable wiring is
shown in Figure .
☞In the factory-default configuration, the IFB-325 Belt
Packs receives IFB audio on pin 3 of its XLR
connector. In this configuration, the belt pack’s
internal shorting plug J3 is set to pins 2 and 3
shorted. This is NOT the correct configuration for use
with the IFB-828.To change the setting, open the belt
pack and reset the J3 shorting plug so that pins 4
and 5 are shorted. Refer to your IFB-325 Manual for
further information.
8.Connect an earset to the IFB belt pack. The Model
IFB-325 accepts only monaural earsets. The Models
4020 and 4030 accept either monaural or stereo
earsets. However, for the standard application of the
IFB-828, only a monaural earset is required.
Monaural Earset Pin-out:
Tip: IFB audio & direct program mix
Sleeve: Common
Stereo Earset Pin-out
Tip: IFB audio & direct program mix (Interrupt)
Ring: Direct program audio (Non-interrupt)
Sleeve: Common
srebmuNniPnoitpircseD
tupnI+tupnI-
162tupnimargorptcerid1lennahc
272)xirtaMmorf(tupniBFI1lennahC
382noitcennocoN
492tupnimargorptcerid2lennahC
503)xirtaMmorf(tupniBFI2lennhaC
613noitcennocoN
723tupnimargorptcerid3lennahC
833)xirtaMmorf(tupniBFI3lennahC
943noitcennocoN
0153tupnimargorptcerid4lennahC
1163)xirtaMmorf(tupniBFI4lennahC
2173noitcennocoN
3183tupnimargorptcerid5lennahC
4193)xirtaMmorf(tupniBFI5lennahC
5104noitcennocoN
6114tupnimargorptcerid6lennahC
7124)xirtaMmorf(tupniBFI6lennahC
8134noitcennocoN
9144tupnimargorptcerid7lennahC
0254)xirtaMmorf(tupniBFI7lennahC
1264noitcennocoN
2274tupnimargorptcerid8lennahC
3284)xirtaMmorf(tupniBFI8lennahC
4294noitcennocoN
5205noitcennocoN
9 Set all belt pack volume controls and all level
controls on the IFB-828 to minimum.
10 Plug in the IFB-828 power cord.The main power
LED on the front panel should light, and each
channel LED should light indicating that power is
being supplied to the belt pack output on that
channel. Ensure that the matrix is operational and
that all program sources are operational.
11 During normal operation (no IFB interrupts
activated) have each talent position adjust their
belt pack volume control for a comfortable program
listening level. (Use the INTERRUPT control on a
model 4020 or 4030 belt pack.)
12 For each IFB: activate the keypanel key that is
assigned to that IFB.The program audio should be
interrupted at the associated IFB belt pack, and the
mic
Table 1. Input Connector Pin-out (J9)

6
audio from the keypanel should become audible.
While the IFB key is activated, adjust the
appropriate level control on the front panel of the
IFB-828 to mix the desired amount of direct
program audio back into the keypanel’s mic audio
signal. When the IFB key is released, the mic
audio should cut off, and the normal program
audio level should be restored.
13 This completes the installation procedure to use
the IFB-828 with an RTS digital matrix.
3 Using the IFB-828 as a Simple
Program Interface with 4020 and
4030 Belt Packs
Use Table and the cable wiring in Figure to connect one
or two program sources to each IFB-828 channel. In this
application, each direct program input at the IFB-828 feeds
to the Non-interrupt channel of the belt pack, and the level
is adjusted by the NON-INTERRUPT control on the belt
pack; each IFB input feeds to the Interrupt channel and is
adjusted by the INTERRUPT control.The control on the
IFB-828 front panel can be used to mix the NON-INTER-
RUPT audio into the INTERRUPT audio.
Figure 2. IFB Belt Pack Interconnect Cable Wiring Diagram

7
4 IFB-828 Specifications
Dimensions
19” wide x 1.75” high x 7.5” deep (483 mm x 44.5
mm x 191 mm)
Input Power Requirements
110/120 or 220/240 VAC, 50/60 Hz, selectable via
a back panel switch
Audio Inputs
Type: Balanced (transformer coupled)
Level: +4 to +8 dBu
Impedance: Approximately 600 ohms
Audio Outputs
Type: Unbalanced
Level: -10 to -6 dBu
Output Power (each IFB belt pack channel)
+24VDC, 200 mA
Connectors
Input (J9)
Type: 50-pin telco
Pin-out: see Table .
Outputs (J1 to J8)
Type: 3-pin male XLR
Pin 1: Audio and DC Common
Pin 2: +IFB audio (interrupt audio) and +24VDC
Pin 3: +Direct program audio (non-interrupt audio)

8
5 IFB-828 Mechanical Assembly Parts
Qty Description Part Number
1 TRANSFORMER, TOROID 559002001
1 CONN .156 SP 3 POS 8800101838
1 CONN D HDWE KIT=KY 8800102463
1 A/C CORD/CONN 18GA 8800102668
1 A/C ENTRY MODULE 8800117313
9 CONN .100SP 2POS 24 8800127838
1 FUSE 1 AMP 5MMX 20M 8800129658
1 LED 5V GN PNL MNT W 8800131495
2 IDE PNL 7” 8800144463
8 KNOB POINTER 15MM 8800156636
8 KNOB 15MM ¼ SHFT 8800157458
8 LED GRN PNL MNT 8800191073
1 COVER 7” TOP/BTM 8800218428
8 KNOB CAP 15MM BLK 8800243720
1 PCB ASSY IFB POWER 90307094000
1 FRONT PANEL IFB828 90707094000
1 REAR PANEL IFB828 90807094000
1 BOTTOM PANEL 91007094000
6 IFB-828 PC Board Electrical Parts
Ref Des Description Part Number
C1 CAPACITOR, EL, 1000 UF, 50V 51821-536
C2 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C11 CAPACITOR, EL, 10 UF, 50V 51821-639
C12 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C13 CAPACITOR, EL, 10 UF, 50V 51821-639
C21 CAPACITOR, EL, 10 UF, 50V 51821-639
C22 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C23 CAPACITOR, EL, 10 UF, 50V 51821-639
C31 CAPACITOR, EL, 10 UF, 50V 51821-639
C32 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C33 CAPACITOR, EL, 10 UF, 50V 51821-639
C41 CAPACITOR, EL, 10 UF, 50V 51821-639
C42 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C43 CAPACITOR, EL, 10 UF, 50V 51821-639
C51 CAPACITOR, EL, 10 UF, 50V 51821-639
C52 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C53 CAPACITOR, EL, 10 UF, 50V 51821-639
C61 CAPACITOR, EL, 10 UF, 50V 51821-639
C62 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C63 CAPACITOR, EL, 10 UF, 50V 51821-639
C71 CAPACITOR, EL, 10 UF, 50V 51821-639
C72 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C73 CAPACITOR, EL, 10 UF, 50V 51821-639
C81 CAPACITOR, EL, 10 UF, 50V 51821-639
C82 CAPACITOR, CM, 0.1 UF, 50V 52676-613
C83 CAPACITOR, EL, 10 UF, 50V 51821-639
D1 DIODE, BRIDGE, 2A, 1000V, BR810DF 558011-000
D11 DIODE, 1N4004, 400V 50745-005
D12 DIODE, 1N4004, 400V 50745-005
D13 DIODE, 1N4004, 400V 50745-005
D21 DIODE, 1N4004, 400V 50745-005
D22 DIODE, 1N4004, 400V 50745-005
D23 DIODE, 1N4004, 400V 50745-005
D31 DIODE, 1N4004, 400V 50745-005
D32 DIODE, 1N4004, 400V 50745-005
D33 DIODE, 1N4004, 400V 50745-005
D41 DIODE, 1N4004, 400V 50745-005
D42 DIODE, 1N4004, 400V 50745-005
D43 DIODE, 1N4004, 400V 50745-005
D51 DIODE, 1N4004, 400V 50745-005
D52 DIODE, 1N4004, 400V 50745-005
D53 DIODE, 1N4004, 400V 50745-005
D61 DIODE, 1N4004, 400V 50745-005
D62 DIODE, 1N4004, 400V 50745-005
D63 DIODE, 1N4004, 400V 50745-005
D71 DIODE, 1N4004, 400V 50745-005
D72 DIODE, 1N4004, 400V 50745-005
D73 DIODE, 1N4004, 400V 50745-005
D81 DIODE, 1N4004, 400V 50745-005
D82 DIODE, 1N4004, 400V 50745-005
D83 DIODE, 1N4004, 400V 50745-005
J1 CONNECTOR, RA XLR, M-3 59892-003
J2 CONNECTOR, RA XLR, M-3 59892-003
J3 CONNECTOR, RA XLR, M-3 59892-003
J4 CONNECTOR, RA XLR, M-3 59892-003
J5 CONNECTOR, RA XLR, M-3 59892-003
J6 CONNECTOR, RA XLR, M-3 59892-003
J7 CONNECTOR, RA XLR, M-3 59892-003
J8 CONNECTOR, RA XLR, M-3 59892-003
J9 CONNECTOR, RA SHIELDED, F-50 590121-002
P1 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P2 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P3 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P4 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P5 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P6 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P7 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P8 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P9 CONNECTOR, ST POLARIZED, 0.100, M-2 57763-402
P10 CONNECTOR, ST LOCKING, 0.156, M-3 57708-103
R1 RESISTOR, CF, 1.8K OHM, 5%, 1W 52154-629
R2 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
Ref Des Description Part Number

9
Ref Des Description Part Number
P10 CONNECTOR, ST LOCKING, 0.156, M-3 57708-103
R1 RESISTOR, CF, 1.8K OHM, 5%, 1W 52154-629
R2 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
R3 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
R4 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
R5 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
R6 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
R7 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
R8 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
R9 RESISTOR, CF, 1.2K OHM, 5%, 1/2W 52154-456
R11 POTENTIOMETER, 100 OHM, 10%, 1W 523015-000
R12 RESISTOR, MF, 2.26K OHM, 1%, 1/2W 54054-226
R13 RESISTOR, MF, 124 OHM, 1%, 1/4W 54042-124
R14 RESISTOR, WW, 10 OHM, 10%, 5W 50155-011
R21 POTENTIOMETER, 100 OHM, 10%, 1W 523015-000
R22 RESISTOR, MF, 2.26K OHM, 1%, 1/2W 54054-226
R23 RESISTOR, MF, 124 OHM, 1%, 1/4W 54042-124
R24 RESISTOR, WW, 10 OHM, 10%, 5W 50155-011
R31 POTENTIOMETER, 100 OHM, 10%, 1W 523015-000
R32 RESISTOR, MF, 2.26K OHM, 1%, 1/2W 54054-226
R33 RESISTOR, MF, 124 OHM, 1%, 1/4W 54042-124
R34 RESISTOR, WW, 10 OHM, 10%, 5W 50155-011
R41 POTENTIOMETER, 100 OHM, 10%, 1W 523015-000
R42 RESISTOR, MF, 2.26K OHM, 1%, 1/2W 54054-226
R43 RESISTOR, MF, 124 OHM, 1%, 1/4W 54042-124
R44 RESISTOR, WW, 10 OHM, 10%, 5W 50155-011
R51 POTENTIOMETER, 100 OHM, 10%, 1W 523015-000
R52 RESISTOR, MF, 2.26K OHM, 1%, 1/2W 54054-226
R53 RESISTOR, MF, 124 OHM, 1%, 1/4W 54042-124
R54 RESISTOR, WW, 10 OHM, 10%, 5W 50155-011
R61 POTENTIOMETER, 100 OHM, 10%, 1W 523015-000
R62 RESISTOR, MF, 2.26K OHM, 1%, 1/2W 54054-226
R63 RESISTOR, MF, 124 OHM, 1%, 1/4W 54042-124
R64 RESISTOR, WW, 10 OHM, 10%, 5W 50155-011
R71 POTENTIOMETER, 100 OHM, 10%, 1W 523015-000
R72 RESISTOR, MF, 2.26K OHM, 1%, 1/2W 54054-226
R73 RESISTOR, MF, 124 OHM, 1%, 1/4W 54042-124
R74 RESISTOR, WW, 10 OHM, 10%, 5W 50155-011
R81 POTENTIOMETER, 100 OHM, 10%, 1W 523015-000
Ref Des Description Part Number
R82 RESISTOR, MF, 2.26K OHM, 1%, 1/2W 54054-226
R83 RESISTOR, MF, 124 OHM, 1%, 1/4W 54042-124
R84 RESISTOR, WW, 10 OHM, 10%, 5W 50155-011
T11 TRANSFORMER, AUDIO 559001-000
T12 TRANSFORMER, AUDIO 559001-000
T21 TRANSFORMER, AUDIO 559001-000
T22 TRANSFORMER, AUDIO 559001-000
T31 TRANSFORMER, AUDIO 559001-000
T32 TRANSFORMER, AUDIO 559001-000
T41 TRANSFORMER, AUDIO 559001-000
T42 TRANSFORMER, AUDIO 559001-000
T51 TRANSFORMER, AUDIO 559001-000
T52 TRANSFORMER, AUDIO 559001-000
T61 TRANSFORMER, AUDIO 559001-000
T62 TRANSFORMER, AUDIO 559001-000
T71 TRANSFORMER, AUDIO 559001-000
T72 TRANSFORMER, AUDIO 559001-000
T81 TRANSFORMER, AUDIO 559001-000
T82 TRANSFORMER, AUDIO 559001-000
VR1 IC, VOLTAGE REGULATOR, LM317 53290-000
VR2 IC, VOLTAGE REGULATOR, LM317 53290-000
VR3 IC, VOLTAGE REGULATOR, LM317 53290-000
VR4 IC, VOLTAGE REGULATOR, LM317 53290-000
VR5 IC, VOLTAGE REGULATOR, LM317 53290-000
VR6 IC, VOLTAGE REGULATOR, LM317 53290-000
VR7 IC, VOLTAGE REGULATOR, LM317 53290-000
VR8 IC, VOLTAGE REGULATOR, LM317 53290-000

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