Comfort audio Comfort Digisystem Access DA20 User manual

Comfort Digisystem User Manual
Access
DA20
English

2Access DA20
User Manual
Table of Contents Page
Introduction to the Comfort Digisystem 3
Presentation of Access DA20 4
Functions – Access DA20 7
Assembly wall bracket/fitting
Access DA20 in wall bracket 8
Navigation wheel 10
Menu summary 11
Menu structure 12
Menu description 14
Channel planning 19
Inputs and outputs 20
SST receiver 21
Radio transmitter 21
Technical data 22
Service and warranty 23
Important safety instructions 24

3
Access DA20
Introduction to the Comfort Digisystem
Thank you for choosing Comfort Digisystem. The products are easy to use,
irrespective of whether or not you have a hearing aid.
Before using the product, please read through the User Manual.
Comfort Digisystem is fitted with SST – SecureStream Technology – a type of
digital technology allowing interception-secure radio transfer in real time.

4Access DA20
Presentation of Access DA20
Access DA20 is a digital multi-channel diversity receiver and transmitter. It
handles all the sound functions (such as levels, mixing and outputs) required
in the classroom. It contains three SST radio receivers with full diversity, with
the option of mixing sound together with sound sources connected by cable.
Full diversity and the SST technology always guarantee the best possible
dynamics and sound quality. Access DA20 contains an SST transmitter and an
FM transmitter with low deviation.
All the functions and settings are accessible via the menu system in the
display. The navigation wheel can be used to scroll through the menu and
select options. The four softkeys can be assigned functions of your choice.
It is thus possible to customise Access DA20 for each individual need.
Students/teachers can easily choose which sounds are to be mixed on each
individual occasion.
It is possible to connect ComLink microphones via an adapter and separate
power pack to DA20.
Access DA20 can easily be configured using the menu to set up Comfort
Digisystem microphones and receivers.
Loop amplifiers can be connected, and it is also possible to listen using an
FM receiver via the built-in FM transmitter.
Signal sources such as TV/Video/Multimedia can be connected to Access
DA20. Active speakers (with a built-in amplifier) can be connected to provide
extra benefit from the system for both teachers and students.
Access DA20 can easily be paired with other Comfort Digisystem units to
be used in the system. A unique code key can be created in order to obtain
interception-secure operation (does not apply to FM or Teleloop).
Access DA20 is particularly useful together with Microphone DM30, which has
both a transmitter and a receiver. DM30 receives on MCH (Main Channel) and
transmits on any CCH (Connecting Channel) and therefore functions as both a
push-to-talk microphone and a receiver for students.
There are a few examples of systems on the following pages.

5
Access DA20
TV
RADIO
DVD/VIDEO
MultiMedia
Line In
Loop Amplifier
Line Out
Teacher 1 DM-30 with neckloop
Teacher 2 DM-30 with neckloop
Student Microphones DM-30 Push To Talk FCR with neckloop
Selecta R20 FM receiver
Student with FM Receiver + Microphone DM-10 Push To Talk FCR
AUX Out/In
Unbalanced or Balanced Input
FM
MCH
MCH
MCH
MCH
MCH
CCH3
CCH2
MCH
CCH1
CCH1
CCH1
CCH1
CCH1

6Access DA20
Teacher 1 DM-10
Teacher 2 DM-10
Student Microphones DM-10 Push To Talk
Student using DE-10 receiver and DM-10 Push To Talk
Student using telecoil loop and DM-10 Push To Talk
CCH3
CCH2
CCH1
CCH1
CCH1
CCH1
CCH1
CCH1
MCH
TV
RADIO
DVD/VIDEO
MultiMedia
Line In
Amplified Speaker
Loop Amplifier
Amplified Speaker
Line Out AUX
Out/In

7
Access DA20
Functions – Access DA20
Antenna for FM
transmitter
Softkeys
Display
Socket for power supply
Navigation wheel
USB socket
(for servicing, etc.)
Line in
Line Out
AUX
ComLink socket
Antenna for SST
transmitter

8Access DA20
Assembly wall bracket/fitting Access DA20 in wall bracket
DA20 comes with a sturdy wall bracket. It is important that the wall bracket
is correctly fitted. It should be fitted on a flat surface, preferably a wall, using
four screws. Suitable screws should be selected based on the wall material.
Rawlplugs may be required for some types of wall. The screw should have a
countersunk head with a maximum height of 3.2 mm.
Fitting DA20 to the wall bracket:
1) Take a firm hold with both hands high up on both sides or the top of the
unit. Do NOT hold the antennas.
2) Position the bottom of DA20 slightly angled to the “fork” of the wall
bracket.
3) Then angle the top of DA20 so that it touches the top of the wall bracket
and push firmly (quick lock).
4) It is possible to lock DA20 to the wall bracket using the accompanying
screw. Fit the unit to the wall bracket as per the description above and
make sure that it is centred. Then screw in the screw through the hole in
the top of the wall bracket until it touches the bottom.

9
Access DA20
Removing DA20 from the wall bracket:
1) Remove any locking screws in the top of the wall bracket if these are fitted.
2) Take a firm hold with both hands high up on both sides or the top of the
unit. Do NOT hold the antennas.
3) Press DA20 down slightly while carefully angling the top out and past the
top of the wall bracket.
Do not angle DA20 out too quickly/hard, as this may damage the bottom
of the product. Comfort Audio's warranties do not cover defects caused by
incorrect handling.
4) Lift up DA20 from the wall bracket.
Please note:
- Do not try to remove Access from the wall bracket once the locking screw
is fitted, as this may damage the product.
- Never lift the product by the antennas.

10 Access DA20
Softkeys
Using the four softkeys, selected functions can be controlled in the main
menu. When a softkey lights up green, the function is active.
Press once to switch off a function. The green light will then go out and aline
will be displayed over the function in the display.
In the menu system under Settings – Softkeys you can choose which softkey
controls which function. See Menu Description .
Move the highlight in the menu down
by turning the navigation wheel anti-
clockwise.
Move the highlight in the menu up
byturning the navigation wheel clock-
wise.
Make your menu selection by pressing
the navigation wheel in.
Navigation wheel
The navigation wheel is used to adjust the settings in the menu. Press the
navigation wheel in to make a choice and change something in the menu. In
certain parts of the menu, the functions OK, CANC,  and  are displayed
at the bottom of the display. This means the softkeys can be used to select ok,
cancel or move the cursor to the left or the right.

11
Access DA20
Menu summary
CCH1 Settings for the SST receiver Connecting channel 1
CCH2 Settings for the SST receiver Connecting channel 2
CCH3 Settings for the SST receiver Connecting channel 3
MCH Settings for the SST transmitter (MCH – Main Channel)
TX FM Settings for FM transmission
MCH Starts/switches off the SST transmitter
(MCH – Main Channel)
CCH1 Level setting for Connecting channel 1
CCH2 Level setting for Connecting channel 2
CCH3 Level setting for Connecting channel 3
TX FM Level setting for FM transmission
ComLink Level setting for connected ComLink microphones
AUX in Level setting for AUX input
Line in Level setting for Line in
AUX out Level setting for AUX output
Out Level setting for Line out
Settings Settings for Softkeys, PIN Code,
Remote control, Language
Locks Lock settings

12 Access DA20
Menu structure
All functions are controlled by turning and pressing the navigation wheel.
(The functions are explained in Menu description .)
CCH1
Back
Channel
Back
Extended
FFC
FFC dB
Pair
Send info
New code key
Squelch
CCH2
Back
Channel
Back
Extended
FFC
FFC dB
Pair
Send info
New code key
Squelch
CCH3
Back
Channel
Back
Extended
FFC
FFC dB
Pair
Send info
New code key
Squelch

13
Access DA20
MCH
Back
Channel
Back
1. 863.250
2. 864.000
3. 864.750
Extended
FFC
FFC dB
Pair
Send info
New code key
TX FM
MCH
CCH1
CCH2
CCH3
TX FM
ComLink
AUX in
Line in
AUX out
Out
Settings
Back
Softkeys
PIN Code
Change code
Hide PINentry
Remote control
Enabled
Pair
Language
About...
Locks
Back
Enter code
Enter PUK

14 Access DA20
Menu description
Back (valid for all submenus)
Here you can choose to back through the menu, and to go back to the main
menu.
CCH1, CCH2 and CCH3 (Connecting channels 1, 2 and 3, SST receiver)
In the main menu, the display shows the squelch setting, signal strength and
selected connecting channel.
The menu options CCH1, CCH2 and CCH3 contain the following selections:
Channel
- Extended
The required channel is selected here, A13 - A55 (768.000 - 784.800 MHz) or
E46-E74 (824,000 - 835,600 MHz) depending on the model.
- FFC
FFC (Free Frequency Check) shows using the text Ok which frequencies are
suitable for use with each channel where the unit is fitted. Please note: Switch
off your other Digisystem transmitters for the correct result.
- FFC dB
FFC dB indicates the noise level in dB for the relevant channel. The higher the
(-)value, the less interference there should be.
If one of these warning symbols shows in the display, read under
Channel planning / Intermodulation in this manual how to
proceed.
Pair
Pairing Comfort Digisystem units to Access DA20 (this is only necessary
if interception-secure operation is required in the system. Otherwise, it is
sufficient to set channels for the transmitter and receiver). This requires a
factory reset of products where a new code key has been used. If necessary,
contact the distributor.
Access DA20 can only transmit pairing information. Pairing information for
the receiver channels CCH1, CCH2 and CCH3 and the transmitter channel
MCH can be sent from the menu or via softkeys (selected under Settings –
Softkeys in the menu).
!!

15
Access DA20
The pairing information sent contains both a code key (for interception-secure
operation) and channel information.
Some Comfort Digisystem products (for example Microphone DM30) can
receive information on two channels, other Comfort Digisystem products (for
example Microphone DM10, Receiver DH10) can receive one channel setting.
The following information is transferred when pairing from each menu/
softkey:
Menu/softkey For example DM30 For example DM10
CCH1 MCH + CCH1 + code key CCH1 + code key
CCH2 MCH + CCH2 + code key CCH2 + code key
CCH3 MCH + CCH3 + code key CCH3 + code key
MCH MCH + CCH1 + code key MCH + code key
There are three examples below:
In order to pair in a Receiver DE10 for the purpose of listening into a system,
pairing from MCH is used.
In order to pair in a Microphone DM10 as a teacher microphone on connecting
channel 2 (CCH2), pairing from CCH2 is used.
In order to pair in a Microphone DM30 for use as a push-to-talk microphone
on CCH1, pairing for CCH1 or MCH is used.
Please note: See also the user manuals for each unit to be paired to find the
pairing mode Receive info.
In order to achieve interception-secure operation in the system (does not
apply to FM transmission or loop) the New code key option is used the first
time something is paired with the system. Subsequently, only the Send info
function is used to pair additional units. This is because the code key saved
applies to the whole system (both in Access DA20 and portable units).
Squelch
Determines the lowest received signal strength. Optional 0 - 40. Increase this
level if the receiver is open to radio signals from other transmitters in the
vicinity that are not intended to be listened to via this Access. Reduce the level
if the signal strength from the transmitter is strong, but the sound can still
not be heard.

16 Access DA20
MCH (Main Channel, SST transmitter)
The following transmitting channels can be selected:
Access DA20
1 863,250 MHz
2 864,000 MHz
3 864,750 MHz
B1 - B23 854 - 863 MHz
E1 - E5 852 - 854 MHz
F1 - F15 865 - 872 MHz
Otherwise, the same menu as for CCH1, except squelch (pairing information
equivalent to CCH1 can be sent).
If one of these warning symbols shows in the display, read under
Channel planning / Intermodulation in this manual how to
proceed.
TX FM
Here the transmitting frequency for the FM transmitter, 169.400 - 218.000
MHz, is selected.
MCH
Starts/switches off the SST transmitter (MCH – Main Channel).
CCH1
Level control, adjustment range: Off, -12.0 to 12.0 dB
CCH2
Level control, adjustment range: Off, -12.0 to 12.0 dB
CCH3
Level control, adjustment range: Off, -12.0 to 12.0 dB
TX FM
Level control, adjustment range: Off, -12.0 to 6.0 dB
ComLink
Level control, adjustment range: Off, -12.0 to 12.0 dB
Access DA20 (f1)
1 863,250 MHz
2 864,000 MHz
3 864,750 MHz
B1 - B4 862 - 863 MHz
F1 - F15 865 - 872 MHz
!!

17
Access DA20
AUX in
Level control, adjustment range: Off, -18.0 to 18.0 dB
Line in
Level control, adjustment range: Off, -18.0 to 18.0 dB
AUX out
Level control, adjustment range: Off, 0.0 to 40.0 dB
Out
Level control, adjustment range: From, 0.0 to 40.0 dB
Settings
Back
Select back to return to the main menu.
Softkeys
Use the softkeys and the navigation wheel to determine which softkey con-
trols which function.
The following choices can be made:
Nothing swtiches off the softkey function
CCH1 activates/deactivates the receiver for CCH1
CCH2 activates/deactivates the receiver for CCH2
CCH3 activates/deactivates the receiver for CCH3
TX FM activates/deactivates FM transmission
ComLink activates/deactivates the ComLink socket
AUX in activates/deactivates the AUX input
AUX out activates/deactivates the AUX output
Line in activates/deactivates Line in
Out activates/deactivates Line out
switches off/starts Access DA20
MCH transmits pairing information (MCH + CCH1 and code key)
CCH1 transmits pairing information (MCH + CCH1 and code key)
CCH2 transmits pairing information (MCH + CCH2 and code key)
CCH3 transmits pairing information (MCH + CCH3 and code key)
PIN Code
- Change code:
It is possible to change the PIN code here. Enter the current PIN code. A new
PIN code can then be entered. It is now possible to go in under Locks which is
in the main menu.

18 Access DA20
If you have lost your PIN code, it is possible to get a PUK code from the
distributor.
- Hide PINentry:
When selecting this function, the unit can only be unlocked using a PIN code
within 10 seconds of the unit starting.
Remote control (accessory)
Activate the remote control by selecting Enabled. Choose
Pair and press one of the buttons on the remote control
DA-05 to be able to remotely control the softkeys.
Language
Here you can select the language for the menu.
About
Here there is information about the software installed on the unit.
You can also perform a factory reset on the unit here by pressing and holding
the outer softkeys (see display).
Locks
Back
Select back to return to the main menu.
Enter code
If the code is given, it is possible to lock functions by navigating using the
navigation wheel. Press the wheel to lock/unlock the function.
On delivery, the lock code is 1234. Tip! Change the code when you start using
Access DA20.
Enter PUK
This is only used to unlock the unit when the PIN code has been lost.
Contact the distributor.

19
Access DA20
Intermodulation
For the receivers and transmitters in the DA20 to work perfectly, the
transmitter’s channel (Main Channel MCH) has a separate frequency to the
receivers’ channels (Connecting Channels CCH1/CCH2/CCH3).
Intermodulation may occur between different frequencies in the system.
This can cause disturbances or a shorter range. To avoid this, the DA20 is
equipped with a function which, depending on the channels selected, warns
of unsuitable channel combinations.
Channels which may cause intermodulation are indicated in the
channel selection menus with this warning symbol. The main channel
has priority, which means that:
In the menu Main Channel (MCH) , channels with this symbol can be
selected. But this channel or the connecting channels which can cause
intermodulation problems may be deactivated and must be reselected.
In the menu Connecting Channels (CCH1/CCH2/CCH3) , channels with
this symbol cannot be selected.
In the menu Connecting Channels (CCH1/CCH2/CCH3) , the channels
which might cause intermodulation problems with other connecting
channels are indicated by this warning symbol. Channels with this
symbol can be chosen, but it might be necessary to change one of the
other connecting channels.
!
Channel planning
When using several radio transmitters in the same or adjacent rooms,
mixing frequencies may occur, so called intermodulation. In order for these
not to cause interference, it is important to plan channels. If necessary,
contact the distributor.
!

20 Access DA20
Out
3.5 mm telejack. The signal can be connected to a balanced or unbalanced
input. See diagram. The output has a low ohm level and can power a pair of
headphones, for instance. The level of the signal can be adjusted via the menu
system.
Inputs and outputs
AUX
The AUX contact contains an electrically balanced input, pins 1 and 3. There
is also an unbalanced output, pin 4. The level of the signals (AUX In and AUX
Out) can be adjusted via the menu system. Pin 2 is earth.
The contact is a 4-pin MiniDIN type.
Connection to balanced input stage
Connection to unbalanced input stage
Line In
3.5 mm telejack. The input is integrating and has an input impedance of 22
k Ω. This provides sound from both the right and left channel, for instance
when connecting to scart. The level of the signal can be adjusted via the menu
system.
If any of the inputs are not used, it is best to turn the level control for this in-
put to Off. The input is then switched off completely.
This eliminates the risk of ‘power hum’.
ComLink
Inputs and outputs for ComLink microphones, 4/4 modular.
Note that the ComLink microphones must be connected via an adapter with
a branch to the ComLink microphones’ power unit. The level control for the
ComLink microphones should be switched off when the socket is not used.