Broadcast Showman 1000 User manual

Showman 1000
Multi-Standard Analogue TV
Demodulator
Handbook Provisional Version 0.3

Multi-Standard Analogue TV Demodulator Showman 1000
2008 dB Broadcast Ltd ii Provisional Version 0.3
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
UK
CB6 2HY
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.dbbroadcast.co.uk
Registered in England No. 2709677

Multi-Standard Analogue TV Demodulator Showman 1000
2008 dB Broadcast Ltd iii Provisional Version 0.3
D
Do oc cu um me en nt th hi is st to or ry y
Date of first publication 30th May 2008
Current issue and date Provisional Version 0.3 / 6th June 2008
Firmware versions

2008 dB Broadcast Ltd iv Provisional Version 0.3
C
Co on nt te en nt ts s
DOCUMENT HISTORY III
INTRODUCTION 6
The Showman 1000 Multi-Standard Analogue TV Demodulator 6
Applications 6
Features 7
GENERAL SAFETY SUMMARY 8
INSTALLATION 10
Electrical Installation 10
Installation within the UK 11
Installation outside the UK 11
Mechanical Installation 11
Rear Panel Connectors 12
RS232 serial control port 13
Reset/Status port 13
Audio outputs – phase connections 15
GETTING STARTED 16
Using the front control panel 16
OPERATION 21
TOP-LEVEL MONITORING 21
MAIN MENUS 23
Receiver Options Menu 24
Audio Options Menu 30
Configuration Options Menu 34
Headphones Options Menu 38
System Options Menu 39
Status Options Menu 42
REMOTE OPERATION 44
Serial port protocol 44
Command syntax 45
Remote Command Descriptions 46
SYSTEM DEFAULTS 59
CHANNEL TABLES 60

Multi-Standard Analogue TV Demodulator Showman 1000
2008 dB Broadcast Ltd v Provisional Version 0.3
APPENDIX F: CHANNEL TABLES 60
SPECIFICATION 68
ORDERING INFORMATION 71

Multi-Standard Analogue TV Demodulator Showman 1000
2008 dB Broadcast Ltd 6 Provisional Version 0.3
I
In nt tr ro od du uc ct ti io on n
The Showman 1000 Multi-Standard Analogue TV Demodulator
The Showman 1000 Off Air Receiver from dB Broadcast is a multistandard (PAL / NTSC /
SECAM) analogue TV demodulator for professional broadcast applications and is capable of
receiving RF signals from most terrestrial or cable analogue broadcast TV standards.
Figure 1: The Showman 1000 Multi-Standard Analogue TV Demodulator
Two Showman versions are available:
A basic multi-standard S-Variant
An enhanced P-Variant with alarm/monitoring and IF I/O
The P-Variant has added IF input and output capability along with monitoring and alarm
functions – including a Status Log facility that can time and date stamp various alarm events
for later analysis. The P-Variant is also capable, when receiving BTSC audio (Standard M),
of providing simultaneous outputs of both Stereo and SAP (Second Audio Program).
Demodulation is to base-band colour composite video and stereo audio (where available).
The optional IF input and IF output is on 38.9MHz vision carrier frequency for all standards*.
Demodulator functions may be controlled either via the front panel LCD (Liquid Crystal
Display) and key menu system or via an RS232 Serial Port.
Note: *A single standard Showman 1000 Demodulator, dedicated to 45.75MHz IF frequency
is also available. (N-variant, not covered by this manual).
Applications
Fixed Monitoring / MCR - Monitoring of outgoing TV signals
Analogue Cable head ends - Off air reception prior to modulation on to cable
Digital TV head ends - Off air reception of analogue services prior to MPEG encoding
Outside Broadcast monitoring - monitoring live programs and own
Transmission monitoring · News Gathering in fixed or mobile situations
Analogue TV Transmitter monitoring

Multi-Standard Analogue TV Demodulator Showman 1000 Introduction
2008 dB Broadcast Ltd 7 Provisional Version 0.3
Features
Over 20 pre-installed country/region tables
Multi-Standard - B/G, I, D/K, L’/L, M/N
Video Systems - PAL, SECAM, NTSC
Audio Systems - NICAM, FM-Stereo (A2 & EIA-J) BTSC
Direct keying of frequency
99 program memory
Headphone socket on front panel
Dual composite video outputs
Dual audio outputs
Adjustable audio, video and chrominance levels
RS232 Port - for external local control and software upgrades
LCD screen display- 2 Line x 20 Characters (White on Blue)
Compact 1RU solution
Optional features
IF Input/Output option
Alarm and logging option
Second Audio Processor option
Real Time Clock option - for time stamping alarm events
Reset/Status Port option- local alarm monitoring and reset input

Multi-Standard Analogue TV Demodulator Showman 1000 General safety summary
2008 dB Broadcast Ltd 8 Provisional Version 0.3
G
Ge en ne er ra al ls sa af fe et ty ys su um mm ma ar ry y
Precautions to avoid personal injury, fire or product damage.
Every care has been taken in the design, manufacture, assembly and testing of this product
to obviate health and safety risks to personnel and to prevent fire or other hazards. However,
please review the following safety precautions for continued protection.
General use. This product must only be used as specified in this manual. Failure to follow
any ratings or directions for use may impair the protection provided.
On receipt of the product. Verify there is no damage and that all accessories are present.
Suspected damage or failure. Do not operate the product. Have it inspected by qualified
service personnel or contact dB Broadcast or an authorised distributor.
Operating environment. The unit is for indoor use only. See the Specification chapter for
further environmental, physical, certification and safety information.
Do not operate in wet or damp conditions.
Do not operate in an explosive atmosphere.
Power cable. Use only a power cable specified for this product and certified safe for the
country of use.
Do Not Remove Covers. There are no user serviceable parts within the case. Qualified
personnel only should perform any servicing necessary.
Grounding. This product must be grounded. Before making any signal connections, ensure
that the product is grounded. The product is grounded through the power cable. To avoid
electric shock under fault conditions, the protective grounding conductor within the power
cable must be connected to an earth terminal of the building in which the product is located.
Bonding. A Ground Bonding (Earth) Terminal is located on the rear panel of the unit for
equipotential bonding with other equipment or racking where required.
This Terminal is identified thus :
Mains supply voltage and fuse ratings. See the Specification chapter. All ratings must be
observed.
Cuts and abrasions. When handling the equipment, guard against cuts or abrasions from
metal parts of the case or components.

Multi-Standard Analogue TV Demodulator Showman 1000 General safety summary
2008 dB Broadcast Ltd 9 Provisional Version 0.3
CAUTION. Caution statements identify conditions or practices that could result in damage to
this product or other property.
Toxic content. Unwanted or obsolete components must be disposed of safely as some may
release toxic vapours if incinerated.
In case of difficulty. Please refer to dB Broadcast.
Lithium battery
A lithium battery maybe located in this product to provide back up for a real-time clock. In
normal operation this battery has a life in excess of 5 years. If the real-time clock’s operation
becomes erratic when cycling the power, then the battery may need replacing. Battery
replacement should only be performed by a ‘skilled and competent technician’, or by
returning to db Broadcast for repair.
CAUTION: Danger of explosion if battery is incorrectly replaced.
Product damage precautions
Take anti-static precautions
Since this unit contains exposed PCB and electronic components, ensure proper anti-static
precautions are observed when handing this equipment.
Provide proper ventilation
To prevent product overheating, provide proper ventilation.
Do not operate with suspected failures
If you suspect there is damage to this product, have it inspected by qualified service
personnel.
There are no user serviceable parts
Return to dB Broadcast or an authorized distributor for repair/service.
Installation
On receipt of the unit, open the box and verify that the unit and all accessory items included.
Save the shipping carton and packing materials in case it becomes necessary to ship the unit
to dB Broadcast for service or repair.

Multi-Standard Analogue TV Demodulator Showman 1000 Installation
2008 dB Broadcast Ltd 10 Provisional Version 0.3
I
In ns st ta al ll la at ti io on n
Before proceeding with product installation, please read the Safety section at the front of
this manual.
Electrical Installation
The unit is designed to operate from a single-phase power source having one of its current-
carrying conductors at or near earth ground (the neutral conductor). Only the line conductor
is fused* for over-current protection.
Systems that have both current-carrying conductors live with respect to ground (such as
phase-to-phase on multiphase systems) must not be used as power sources. A protective
ground connection by way of the grounding conductor in the power cord is essential for safe
operation.
The mains outlets intended to supply the unit should either be close to the unit and easily
accessible to the user or the unit mains inlet should be easily accessible in the final
installation.
Correct mains polarity must always be observed. Ensure all mains connections are
connected correctly.
Fuse Rating*: See Specification
For continued protection against risk of fire, replace only with the same type and rating of
fuse.
Pour ne pas compromettre la protection contre les risques d’incendie, remplacer par un
fusible de même type et de mêmes caractéristiques nominales.

Multi-Standard Analogue TV Demodulator Showman 1000 Installation
2008 dB Broadcast Ltd 11 Provisional Version 0.3
Installation within the UK
If supplied, the mains power lead for this unit is fitted with moulded connectors.
The mains plug may not suit local mains outlets, in which case the mains plug fuse should
be removed and the mains plug cut off from the power lead and destroyed. This is in
order to minimise any risk of shock from the exposed conductors, in the event of the
discarded mains plug being inserted into a live socket.
The wires of the power lead are colour coded as follows:
BROWN LIVE
BLUE NEUTRAL
GREEN/YELLOW EARTH
A suitable plug should be wired to the power lead as follows:
Connect the BROWN wire to the terminal marked ‘L’ or coloured brown or red.
Connect the BLUE wire to the terminal marked ‘N’ or coloured blue or black.
Connect the GREEN/YELLOW wire to the terminal marked ‘E’ or ‘ ’or coloured
green and yellow or green.
The plug fitted should contain a 3 Amp fuse protecting the BROWN wire. Alternatively the
distribution circuit supplying the plug must be protected by a fuse or circuit breaker of
suitable rating. Ensure that the cord grip tightly clamps the power lead outer sheath.
This unit must be earthed.
Installation outside the UK
If the power lead supplied has a UK style moulded on mains plug (identified by the marking
BS1363) the colour code of the wires within the lead is as follows:
BROWN LIVE
BLUE NEUTRAL
GREEN/YELLOW EARTH
Ensure the relevant country wiring regulations are observed.
Mechanical Installation
This product requires no assembly and is designed to be installed in an industry standard
483mm (19-inch) rack. Allow at least 100mm clearance at the back of the product for cable
connections. Ventilation slots on both sides of the product must be kept clear to allow free
airflow.

Multi-Standard Analogue TV Demodulator Showman 1000 Installation
2008 dB Broadcast Ltd 12 Provisional Version 0.3
Rear Panel Connectors
Most connections are available from the rear of the frame. A single 70Ω 6.35mm (¼”) stereo
headphone socket is provided at the front of the frame.
The connectors marked (optional) in the following table are for variants of the basic model.
Table 1: Connector Assignments
Connector Connector signal
RF IN
75 ΩBNC
Signal from an aerial/antenna or other RF source to be demodulated. Input
frequency range: 45.25MHz to 863.25MHz.
Signal level range: 48 to 80dBμV (0.2 to 10mVrms).
IF IN
(Optional) 50 ΩBNC
This is a 38.9MHz vision carrier frequency input (all standards). The input has
automatic gain control (AGC).
Signal level range: –35dBm to -7dBm (4 to 100mVrms).
IF OUT
(Optional) 50 ΩBNC
This is a 38.9MHz vision carrier frequency output (all standards).
Output level: –10dBm (nominal for RF Input > 66dBμV).
SIF OUT 50BNC
Standard dependent sound IF output. The primary sound carrier (S1) may be at
4.5MHz, 5.5MHz, 6.0MHz or 6.5MHz. A secondary sound carrier (S2) used for
stereo or dual language mode may also be present.
S1 output level: –9dBm (nominal for RF Input > 66dBμV).
RESET/STATUS
(Optional) 9-way D-type
Connector (Female)
The optional Reset/Status Port allows the Showman 1000 to be wired to a local
monitoring system for status checks and alarms. See below for details.
RS232
9-way D-type Connector
(Female)
Communications and Control port for local control and software upgrades.
VIDEO OUT 1&2
75 Ω BNC Connectors Each provides a standard 1 volt colour composite video output.
AUDIO 1 and 2 OUT
3-way PSC Connectors
Audio 1 and Audio 2 may be configured separately (via the Audio Options
Menu) E.g. to give one stereo pair and one mono pair of outputs.
Mains Power Input & Fuse
Holder
Accepts a standard IEC ac mains power lead. A mains input safety fuse is
located within the Power Receptacle.
Refer to the Power section of the Specification for replacement fuse details.
Ground Terminal Screw Terminal. See previous Safety section.
Headphone socket
(Front Panel) 70Ω 6.35mm (¼”) stereo audio output on front panel.
Note: Always ensure all unused outputs are terminated to comply with CE emission
requirements.

Multi-Standard Analogue TV Demodulator Showman 1000 Installation
2008 dB Broadcast Ltd 13 Provisional Version 0.3
RS232 serial control port
The RS232 serial port is provided for external local control and software upgrades.
Table 2: RS232 pinout
PIN Signal
1N/C
2Transmit data (To PC)
3Receive data (From PC)
4N/C
5Ground
6N/C
7CTS
8RTS
9N/C
Shell Chassis ground
Reset/Status port
The Reset/Status port allows the Showman 1000 to be hardwired for local monitoring for
status checking and, where necessary, to trigger an alarm or external reset.
Table 3: Reset/Status port pinout
PIN Signal Comments
1Signal Ground
2Critical Alarm (Relay 1 common)
3Non-Critical Alarm (Relay 2 n/o) Pins 3-8 Joined=Normal
4Non-Critical Alarm (Relay 2 n/c) Pins 4-8 Joined=Alarm
5Reset Source (10Ω to ground) Pins 5-9 Join to Reset
6Critical Alarm (Relay 1 n/o) Pins 6-2 Joined=Normal
7Critical Alarm (Relay 1 n/c) Pins 7-2 Joined=Alarm
8Non-Critical Alarm (Relay 2 common)
9Reset Input (470Ω to +5V) Pins 9-5. Join to reset
Shell Chassis ground Cable Shield

Multi-Standard Analogue TV Demodulator Showman 1000 Installation
2008 dB Broadcast Ltd 14 Provisional Version 0.3
Monitoring is via two independent, isolated, sets of relay contacts that monitor critical and
non-critical alarms, respectively.
Definition of critical and non-critical alarm:
Critical Alarm
A critical alarm indicates total power failure. In this state the Relay 1 is de-energised and
Reset/Status port pins 2 and 7 are connected.
For normal operation, Relay 1 is energised and pins 2 and 6 are connected.
Non-critical Alarm
A non-critical alarm (see below) indicates a recoverable fault. In this state the Relay 2 is de-
energised and Reset/Status port pins 8 and 4 are connected.
For normal operation, Relay 2 is energised and pins 8 and 3 are connected.
There are 6 possible non-critical alarms:
1. Self-test failure
2. Sync failure
3. Low RF level
4. High Nicam error rate
5. Temperature <+10ºC or >+70ºC
6. Power supply outside limits
Reset
To reset the unit, momentarily link pin 5 and pin 9 for >10mS.
Note: pin 9 is internally connected to a 470Ω ‘pull-up’ resistor to +5 volts.

Multi-Standard Analogue TV Demodulator Showman 1000 Installation
2008 dB Broadcast Ltd 15 Provisional Version 0.3
Audio outputs – phase connections
Table 4: PSC audio output pinout
PIN Signal
1Audio Positive Phase
2Ground
3Audio Negative Phase*
Note: Connect to 0V (Ground) for Un-Balanced
PSC Connector Details
The PSC-type rear panel mounted Audio Outputs connector (with male pins) is a 3-way,
3.5mm pitch, POWER-SUBCON type that has the outer geometry and screening capability of
a 9-way D-SUB connector. The mating female plug may be a simple 3.5mm pitch MINI-
COMBICON type (non-D-SUB profile), where positive cable retention is not deemed
necessary. If cable retention is required, a POWER-SUBCON plug may be used. This can be
fitted within a standard 9-way D-SUB housing, which has normal screw locking and cable
retention facilities.
Connector Manufacturer: Phœnix Contact
Web Address: http://www.phoenixcontact.com
Table 5: PSC Connector Details
PART Type Number Comments
3-Way Mini-Combicon MC 1,5/3-ST-3,5 No cable retention possible
3-Way Power-Subcon PSC 1,5/3-F Retention possible with housing.
Cable Housing SCT-D-SUB 9-KG Use with 3-Way POWER-SUBCON

Multi-Standard Analogue TV Demodulator Showman 1000 Getting Started
2008 dB Broadcast Ltd 16 Provisional Version 0.3
G
Ge et tt ti in ng gS St ta ar rt te ed d
This section provides a functional check and basic operation guide. It can also be used to
learn how to use the control interface and check for correct operation.
Using the front control panel
Figure 2: Front Panel
LCD Panel
A two-line, 20-character, liquid crystal display with backlight is used to present unit
configuration and status information. Characters are in white on a blue background. The
contrast is menu adjustable.
Cursor Keys
The Cursor Keys are used to navigate around display items or to change menu settings. The
Cursor Keys are represented in this manual by the symbols ◄ ► ▲ ▼.
ENTER Key
Use the enter key to access the menu system or accept configuration changes.
ESCAPE Key
Use the escape key to exit the menu system or cancel configuration changes.
POWER LED
A green LED to indicate that the unit is powered.
ALARM LED
A red LED to indicate that the unit has detected a fault condition.
Headphone Output
70Ω 6.35mm (¼”) standard stereo headphone jack socket.
In this manual, the cursor key symbols ◄, ►, ▲ or ▼ along with <ENTER> and <ESCAPE>,
indicates a single press (unless otherwise indicated) of the corresponding front panel keys.

Multi-Standard Analogue TV Demodulator Showman 1000 Getting Started
2008 dB Broadcast Ltd 17 Provisional Version 0.3
To use the Showman 1000 for the first time or check basic operation, proceed as follows:
1. Applying mains power
Note: There is no power on/off switch.
Connect (100 to 240VAC, 50/60Hz) at the IEC input of the unit. The two-line LCD panel
will illuminate and display an RF (IF) LEVEL bar graph (top line) and the currently tuned
channel number and/or frequency (bottom line).
Note: This Top-Level Menu page is referred to in this manual as DEFAULT.
Tip: Press the <ESCAPE> key repeatedly to return the LCD to DEFAULT.
2. Using the RF Input
The RF Input has 75Ω nominal impedance. All connectors, co-axial cables,
aerial/antennas or signal generators should be 75Ω. Apply an analogue television RF
signal of between 46 and 80dBμV (0.2 and 10mVrms) to the RF IN connector.
Note: The T.V. standard and frequency/channel of the RF signal must Showman 1000
settings.
3. Setting or checking the TV Standard
From DEFAULT (See item 1 above) press ► ►
The T.V. Standard can now be viewed
Press <ESCAPE> to return to DEFAULT
To change TV standard:
From DEFAULT press: <ENTER> <ENTER> ▲ <ENTER>
Press ▲ or ▼ to select the required standard
Press <ENTER> to accept or <ESCAPE> to reject the selection
Press <ESCAPE> again to return to DEFAULT
Note: For most standards, there are several Channel Plans, depending on region,
country or frequency band (VHF or UHF).
To change channel:
From DEFAULT press: <ENTER> <ENTER> <ENTER>.
Press ▲ or ▼ to select the required channel.
Press <ENTER> to accept or <ESCAPE> to reject the selection.
Press <ESCAPE> again to return to DEFAULT.
To change frequency:
From DEFAULT press: <ENTER> <ENTER> ▼ <ENTER>
Press ◄ or ► to highlight the frequency digits to be adjusted
Press ▲ or ▼ to adjust to the required value

Multi-Standard Analogue TV Demodulator Showman 1000 Getting Started
2008 dB Broadcast Ltd 18 Provisional Version 0.3
Press <ENTER> to accept or <ESCAPE> to reject the selection
Press <ESCAPE> again to return to DEFAULT
When Showman 1000 is correctly tuned, between five and nine segments of the RF
LEVEL bar graph should be solid.
4. Using the optional IF Input
The IF Input has 50Ω nominal impedance. All connectors, co-axial cables and signal
generators should be 50Ω. Apply a -35 to -7dBm (4 to 100mVrms) 38.9MHz video signal
to the IF IN connector.
To select IF input:
From DEFAULT press: <ENTER> ▼ ▼ <ENTER> <ENTER>
Note: The LCD must show Input Source/RF Input for the option to be available,
otherwise press <ESCAPE> twice to return to DEFAULT.
If RF Input is displayed press ▲ or ▼ to select IF Input.
Press <ENTER> to accept or <ESCAPE> to reject the selection.
Press <ESCAPE> again to return to DEFAULT.
With the above I.F. signal applied, between five and ten segments of the IF LEVEL
bar graph should be solid.
Note: For information on how to change other settings, refer to the Operation chapter.
5. Top-Level Monitoring
Repeat pressing of ► will step the LCD through the following “Top-Level” monitoring
pages:
System Alarms: One or more of the following 3 letter codes may be displayed:
TST = Self test fail
SYN = Sync fail
LEV = Low signal level
NIC = Nicam error rate fail
TMP = Temperature <+10ºC or >+70ºC
PSU = Power supply outside limits
Standard: Indicates the television TV standard to which Showman 1000 is set and
the detection or validity of any incoming sound carriers (S1 and S2).
S1 “Yes” indicates that a primary FM or AM carrier is detected.
S2 “Yes” indicates that a valid secondary FM or Nicam carrier for Stereo or Dual
Language/SAP operation is detected.
S2 “No” indicates that a second FM or Nicam carrier is either absent, not valid or
is set to mono.
Note: the TV standard has to be set manually.

Multi-Standard Analogue TV Demodulator Showman 1000 Getting Started
2008 dB Broadcast Ltd 19 Provisional Version 0.3
Audio Detected. This page automatically shows the type of broadcast signal
received, i.e. Mono, Dual Language, Stereo or SAP (Second Audio Program –
M/N Standard only).
Audio 1 Quasi-Peak Detectors. Twin bar graphs give a visual indication of
audio activity on the left (L) and right (R) hand Audio 1 Outputs. Any solid
segments of the bar graph indicate the presence of audio.
Audio 2 Quasi-Peak Detectors. As for Audio 1 above but indicating audio
activity on the Audio 2 Outputs.
Nicam BER. This page is only valid for Nicam operation and indicates the Nicam
Bit Error Rate (BER). A BER threshold can be set (see Nicam Alarm Set in the
Configuration Options Menu section of the Operation chapter) to trigger the front
panel ALARM LED or for remote alarm monitoring.
Serial No. This page displays the unit’s serial number, firmware number and
firmware version
Press <ESCAPE> to return to DEFAULT
6. Video Monitoring: Connect Video Out 1 or Video Out 2 to an analogue video
picture or waveform monitor. Ensure that the monitor terminates the signal in 75Ω.
Check for a correct video display.
7. Audio Monitoring: Connect a stereo audio monitoring system to either the Audio 1
or Audio 2 output pair.
Note: These 3-pin audio output pairs supply electronically balanced, low impedance,
line level signals designed to feed into 600Ω or higher impedance loads. Viewing
these connectors from the rear of the unit, the left and right hand outer pins are,
respectively, the + and – phase of the balanced audio signals. The centre pin of each
connector is at ground potential. If unbalanced operation is required, then the – phase
should be linked to the ground pin. Audio levels and output preferences can be
adjusted via front panel menu options. (See the Operation chapter).
8. IF Output Monitoring: (Option) Connect a 50Ω terminated spectrum analyzer to the
IF OUT connector. Peak power at 38.9MHz should be about –7dBm. Using a
100MHz oscilloscope terminated in 50Ω, sync tips should measure about 300mVP-P
(excluding any sound carrier).
9. SIF Output Monitoring: Connect a 50Ω terminated spectrum analyzer to the SIF
OUT connector. Typical power at 6.0MHz (PAL I Standard, FM carrier only) should
be approximately -9dBm. Using a 100MHz oscilloscope terminated in 50Ω, the 6MHz
waveform should measure about 230mVP-P.
10. Headphones: From DEFAULT, insert a standard 6.35mm (1/4”) stereo headphone
jack-plug into the front panel headphone socket to switch the LCD to a Headphone
Volume setting mode.
Press ▲ or ▼ to adjust the volume. (It is not necessary to press <ENTER> to
store the volume setting).

Multi-Standard Analogue TV Demodulator Showman 1000 Getting Started
2008 dB Broadcast Ltd 20 Provisional Version 0.3
Press <ESCAPE> to go to the Headphone Options menu.
Press ▲ to select the Headphone Options/Audio Source menu.
Press <ENTER> to select Audio Source.
Press ▲ or ▼ to select between monitoring Audio 1 or Audio 2.
Press <ENTER> to accept or <ESCAPE> to reject the selection.
Press <ESCAPE> again to return to DEFAULT.
Alternatively access the Headphone Options menu as follows: From DEFAULT:
Press <ENTER> ▲ ▲.