Broadcast Tools B031 User manual

B031
DUAL PILOT TONE DETECTOR
Handbook Version 0.8

Dual Pilot Tone Detector B031
2007 dB Broadcast Ltd
dB Broadcast Ltd has made every effort to ensure the accuracy of information contained within this
document which is nevertheless supplied for information purposes only and does not constitute any
form of warranty or guarantee.
All trademarks acknowledged.
The information in this document is subject to change without notice.
dB Broadcast Ltd
Registered Office:
Kestrel House
Sedgeway Business Park
Witchford
Ely
Cambridgeshire
CB6 2HY
UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.dbbroadcast.co.uk
Registered in England No. 2709677

Dual Pilot Tone Detector B031
2007 dB Broadcast Ltd
D
Do oc cu um me en nt th hi is st to or ry y
Date of first publication 28/03/2007
Current issue and date 0.8 / 28th March 2007
Board issue numbers
covered

Dual Pilot Tone Detector B031
2007 dB Broadcast Ltd
C
Co on nt te en nt ts s
INTRODUCTION 1
Main Features 2
INSTALLATION 3
SELECTING REAR CONNECTORS 3
Rear Panel Connections 4
CONFIGURATION AND OPERATION 5
Front Panel Control 5
CONFIGURATION 6
Channel A main module adjustments 6
Channel B main module adjustments 6
Timer module adjustments 7
SAMPLE PROBLEMS AND THEIR SOLUTIONS 9
ORDERING INFORMATION 10
SPECIFICATION 11

Dual Pilot Tone Detector B031 Introduction
2007 dB Broadcast Ltd 1 Version 0.8
I
In nt tr ro od du uc ct ti io on n
The B031 Dual Pilot ToneDetector module has dual balanced audio inputs with independent
detector circuits. It fits in 1U or 3U Vistek frames and power is derived from the frame
PSU(s).
The B031 Dual Pilot Tone Detector
The input impedance is selectable to either 600or 50k. The detection threshold is set by
DIL switches in 0.5dB steps from -10dB to -33dB and a further adjustment of +/- 10dB via the
front panel.
The front panel LED's indicate undelayed and delayed tone failure.
The undelayed tone indication will operate immediately tone is lost, and the delayed tone
indication will operate following tone loss for a preset time. The delayed tone indication will
extinguish once the signal returns continuously for a preset time period. The good to fail time
delay period can be adjusted in 1 second steps between 0-15 seconds. The fail to good time
delay period can be adjusted in 0.1 second steps between 0-1.5 seconds.
Undelayed remote status signals are provided as peripheral driver outputs and the delayed
remote status signals as isolated relay contacts.
The module is DART compatible and provides monitoring status to the DART Bus.

Dual Pilot Tone Detector B031 Introduction
2007 dB Broadcast Ltd 2 Version 0.8
Main Features
Dual pilot tone detector for Vistek frames
Inputs may be terminated with 600or Hi –Z (50k)
Front panel indications for pilot tone fail (undelayed and delayed) for each channel
Peripheral driver output for undelayed tone fail and isolated relay outputs for delayed
tone fail and tone OK
Adjustable delayed tone fail onset and reset timing
Front panel fine adjustment for tone level loss threshold
Internal coarse adjustment for tone level threshold and tone frequency sensitivity
DART monitoring capable as standard

Dual Pilot Tone Detector B031 Installation
2007 dB Broadcast Ltd 3 Version 0.8
I
In ns st ta al ll la at ti io on n
Selecting Rear Connectors
The available rear connectors and the frames/signal I/O used are as follows:
Type Frame Connectors Signal types
VB130 1U(F010)/3U
Vistek 3-pin screw terminal Analogue audio
3U Vistek style
chassis VB130

Dual Pilot Tone Detector B031 Installation
2007 dB Broadcast Ltd 4 Version 0.8
Rear Panel Connections
SIGNAL CONNECTOR COMMENTS
A1 3 pin screw Not used
A2 3 pin screw Not used
A3 pin screw Input 1
B1 3 pin screw Not used
B2 3 pin screw Not used
B3 pin screw Input 2
Control and Status - 26 way D type
PIN SIGNAL (pins 1 –13) PIN SIGNAL (pins 14 – 26)
10V CTL A 14 0V SUPPLY GROUND
20V CTL A 15 SPARE
30V CTL A 16 SPARE
40V CTL A 17 B TONE FAIL (DELAYED)
5A TONE OK (UNDELAYED) 18 B TONE OK (DELAYED)
6A TONE OK (UNDELAYED) 19 DELAYED COMMON
7DELAYED COMMON 20 DELAYED COMMON
8DELAYED COMMON 21 B TONE OK (UNDELAYED)
9A TONE OK (DELAYED) 22 B TONE OK (UNDELAYED)
10 A TONE FAIL (DELAYED) 23 0V CTL B
11 SPARE 24 0V CTL B
12 SPARE 25 0V CTL B
13 0V SUPPLY GROUND 26 0V CTL B

Dual Pilot Tone Detector B031 Configuration and Operation
2007 dB Broadcast Ltd 5 Version 0.8
C
Co on nf fi ig gu ur ra at ti io on na an nd dO Op pe er ra at ti io on n
Front Panel Control
LED Indicators:
DYellow – Flashing indicates DART monitoring is active
VGreen – Indicates DC power present & OK
Sig Fail Yellow – Immediate signal loss indication
Delay Red – Delayed signal loss indication
Controls:
Threshold Pilot tone loss threshold adjustment
Vistek
LED Ext Alrm Meaning when lit or active
Sig Fail Tone OK (Undel)
– Peripheral
driver
Pilot tone detected – tone level below threshold set
by Threshold A (CHA) and Threshold B (CHB)
and/or module settings. See Configuration section.
Delay Tone Fail (Del) -
Relay Pilot tone loss detected (delayed) – tone level below threshold set by RV1/S1 (CHA) and RV2/S2 (CHB)
None Tone OK (Del) -
Relay Pilot tone detected (delayed) – tone level above threshold set by RV1/S1 (CHA) and RV2/S2 (CHB)
Note: Sig Fail is the opposite sense to Tone OK (Undel).

Dual Pilot Tone Detector B031 Configuration and Operation
2007 dB Broadcast Ltd 6 Version 0.8
Configuration
Each channel has a number of configuration jumper links and adjustments.
The B031 Dual Pilot Tone Detector showing jumper links
Channel A main module adjustments
Adjustment Main Module - Channel A
JP1 Select 600termination or high impedance (50k).
JP2 - 5 Place the jumpers in the 19kHz (left) or 22.5kHz (right) position for the pilot
tone sensitivity required.
S1 Set DIL switch levers for the coarse tone loss threshold level required –
see table on page 8.
RV1 Front panel adjustment for fine control of tone loss threshold (+/- 10dB).
JP6 Move this link to the top for floating common ground.
Move this link to the bottom for grounded common ground.
Channel B main module adjustments
Adjustment Main Module - Channel A
JP7 Select 600termination or high impedance (50k).
JP8 - 11 Place the jumpers in the 19kHz (left) or 22.5kHz (right) position for the pilot
tone sensitivity required.
S2 Set DIL switch levers for the coarse tone loss threshold level required –
see table on page 8.
RV2 Front panel adjustment for fine control of tone loss threshold (+/- 10dB).
JP12 Move this link to the bottom for floating common ground.
Move this link to the top for grounded common ground.
Note: Carrier Null and PLL Adjust are factory set and should not require re-adjustment.

Dual Pilot Tone Detector B031 Configuration and Operation
2007 dB Broadcast Ltd 7 Version 0.8
Timer module adjustments
Delayed Pilot Tone loss Onset and Reset delays
Adjusting Onset (Good to Fail time) delay
This is adjusted using the 16-way rotary switch SW2 from 10 to 15 seconds.
SW2 Delay in seconds SW2 Delay in seconds
0088
1199
22A10
33B11
44C12
55D13
66E14
77F15
Adjusting Reset (Fail to Good time) delay
This is the period following a failure that the module waits before signalling that the pre-
failure state has been regained. It is adjusted using SW1 in 0.1 second steps from 0.1
second to 1.5 seconds.
SW1 Delay in seconds SW1 Delay in seconds
0080.8
10.1 90.9
20.2 A1.0
30.3 B1.1
40.4 C1.2
50.5 D1.3
60.6 E1.4
70.7 F1.5

Dual Pilot Tone Detector B031 Configuration and Operation
2007 dB Broadcast Ltd 8 Version 0.8
Adjusting Pilot Tone loss Threshold Settings
The coarse tone loss threshold setting is adjusted using S1 for input A and S2 for input B.
S1/S2 Value
1-12dB
2-6dB
3-3dB
4-1.5dB
5-0.5dB
6+0.5dB
The threshold set with all switches off is -20dB; the table shows the additional threshold
values for each switch. To calculate the required switch setting, always subtract 20dB from
the totalconfiguration value.
Example
To obtain a threshold of -35dBu, set levers 1 (-12dB) and 3 (-3dB), this gives an effective
level threshold of-35dB (-15dB -20dB). The -20dB adjustment is only subtracted once for
each input.
Note: It is recommended to use the fine control accessible through the front panel for accurate
calibration.

Dual Pilot Tone Detector B031 Configuration and Operation
2007 dB Broadcast Ltd 9 Version 0.8
Sample Problems and their Solutions
The unit does not appear to operate correctly
Check that the green ‘V’ LED is illuminated and that the module is seated correctly in the
frame.
Check that the appropriate rear connector has been cabled correctly.
The fail LED keeps blinking on and off for good signals
Check the six-way threshold DIL switch threshold setting. (S1 for CHA, S2 for CHB). If
necessary try backing the sensitivity off a little using the fine threshold control accessible
through the front panel (RV1 for CHA; RV4for CHB).
Check the pilot tone frequency links (JP 2 -5 for CHA, JP8 – 11 for CHB).
Check that the incoming signal is correctly terminated.
The delayed status indicates bad signal too often
Check the onset (Good to Fail) delay is not to low
Check the reset (Fail to Good) delay is not to low
The delayed status does not indicate bad signal sometimes
Check the onset (Good to Fail) delay is not to high
The delayed status takes too long to recover from indicating a bad signal
Check the reset (Fail to Good) delay is not to high

Dual Pilot Tone Detector B031 Ordering Information
2007 dB Broadcast Ltd 10 Version 0.8
O
Or rd de er ri in ng gI In nf fo or rm ma at ti io on n
B031 module types
3U Vistek configuration
V1606-dB-2PSU 3U Chassis, 14 Module slots, 2 PSU slots (2 PSUs included)
V1610-dB-48V 3U Chassis, 14 Module slots, 2 48V PSU slots (2 48V PSUs included)
VB130 Screw terminal Rear connector module
1U Vistek configuration (dual PSU)
F010 1U Chassis, 2 Module slots, 2 PSUs ( PSUs included)
VB130 Screw terminal Rear connector module

Dual Pilot Tone Detector B031 Specification
2007 dB Broadcast Ltd 11 Version 0.8
S
Sp pe ec ci if fi ic ca at ti io on n
INPUTS & OUTPUTS
Signal formats Analogue Audio
Connectors 3-Pin Screw Terminal
Impedance 600 or Hi Z/50k (Link Selectable)