A.W. Communication Systems DRC1 User manual

DRC1 Configuration Handbook to software Version 3.6
A.W. Communication Systems Ltd.
Crook Barn
The Crook
Roweltown, Carlisle
Cumbria CA6 6LH
England
Tel [phone] Fax [phone]
www.toneremote.co.uk

Part 1, Installation and Configuration.
Forward
Thank you for purchasing the DRC-1 desktop radio control unit. If used within the guidelines
specified herein, the unit will provide trouble free operation without the need for service or
repair.
Repair Philosophy.
The DRC-1 has been designed using the very latest microprocessors and employs specially
written and tuned DSP software. Should the unit appear not to function properly, double
check the programming parameters you have set. It mayalso be worth checking the user
feedback file (if any) online at http://www.toneremote.com. This will aid fault identification
and correction.
Please note: The DRC-1 has no internal adjustments and there are no user repairs possible to
the unit. A.W. Communications employ special to type test jigs and diagnostic software to
calibrate and repair the units. Users who choose to open up the DRC-1 invalidate the warranty
issued when the unit was purchased.
We offer a range of service contracts for all of our product range, please contact our sales
department for full details.
The unit is sold under our standard terms and conditions and will carry a full twelve months
warranty subject to proper use and installation.
Please take the time to register your unit at http://www.toneremote.comand receive your
password to access the software support section of the web site.
When seeking technical support, you may be asked for the installed software version number.
Please see menu descriptions, which instruct how to read the software version number.
Unpacking and unit identification.
Within the carton (single Package) you should find:-
The main body of the control unit
The telephone handset.
The telephone handset connecting cord.
The modular power supply unit.
The power supply unit cord terminated in a 13 amp plug (fused at 5amp) UK only
Telephone interface cable
A line interface cable

Connectors on the rear panel.
Auxiliary Port Record / Playback Port
Power Comms PTT Headset Microphone Telephone Line (PW)
Telephone handset
On side of unit
Power Supply Port.
The unit requires 12vDC nominal supply, centre pin positive. It is recommended that only the
supplied power supply unit is employed.
Auxiliary Port.
The auxiliary port is used for connecting third party equipment such as modems, employed in
data capable radio systems.
Record And Playback Port.
The record and playback port is intended to be connected to incident recording devices such
as instant record / replay units installed at the dispatcher position. These units are often used
to record and playback as many times as required radio and telephone traffic to the dispatcher.
Communication (Comms) Port.
The comms port is used to read and program the unit from a lap top when in program mode,
and to provide a data connection between the A.W.C. touch screen system when it is
employed as the man machine interface. This port is also used to connect a selcall logging
printer.
PTT.
This connector facilitates the connection of a foot operated PTT switch.

Headset Port.
The headset port facilitates the connection of an operator’s headset used to achieve quiet
operation at the dispatcher workstation.
Microphone Port.
The microphone port facilitates the connection of a desk stand microphone as may be
employed in a taxi dispatcher work station.
Telephone Port.
The DRC-1 is capable of operating in common headset mode. This mode enables a single
headset to be switched between radio traffic and telephone traffic. By using this facility, the
dispatcher can make and receive telephone calls without missing radio traffic. This
connection is designed to plug into a desktop telephone unit, which has a headset connector.
Line Port.
The line port facilitates connection of the DRC-1 to either a private telephone line, which
connects the dispatch workstation to the radio base station, or any communication port
presented as 4 wire, 2 pair (send and receive). See specifications for levels and frequencies.
Line port connections RJ45
Pin
Number Signal Notes
1 Line in 0 600Ωbalanced
2 Line in 1 600Ωbalanced
3 Line Out 0 600Ωbalanced
4 TX data + Used with DS32 switch
5 TX data -Used withDS32 switch
6 Line Out 1 600Ωbalanced
7 PTT O/p Active low
8 Ground
Telephone Connector RJ8
Pin
Number Signal Notes
1 Send audio
2 Return audio
3 Return audio
4 Send audio

Desk Microphone Connector RJ11
Pin
Number Signal Notes
1 Telephone select I/p Active Low
2 Ground
3 Microphone I/p Electret biased 10KΩ
4 PTT Active Low
5 Ground
6 Auxiliary +12vDC Limited to 500 mA ** see note
Handset Connector RJ8
Pin
Number Signal Notes
1 Microphone -
2 Ear -
3 Ear +
4 Microphone +
Comms Connector DB9F
Pin
Number Signal Notes
1 N/C
2 TX data Data output from the unit
3 RX data Data input to the unit
4 DTR Data Terminal Ready
5 Ground
6 DSR Data Set Ready
7 N/C
8 N/C
9 TOSC I/p Active low
Record & Playback Connector DB9F
Pin
Number Signal Notes
1 Auxiliary +12vDC Limited to 500 mA ** see note
2 Tape O/p 0 600Ωbalanced
3 Tape I/p 0 600Ωbalanced
4 Tape Select I/p Active Low
5 Tape O/p Active Low
6 Ground
7 Tape O/p 1 600Ωbalanced
8 Tape I/p 1 600Ωbalanced
9 Ground

Auxiliary Connector DB9F
Pin
Number Signal Notes
1 Auxiliary +12vDC Limited to 500 mA ** see note
2 Audio Out 0 600Ωbalanced
3 Audio In 0 600Ωbalanced
4 Auxiliary PTT Active Low
5 Ops Busy Signal/or Alarm Active Low
6 Ground
7 Audio Out 1 600Ωbalanced
8 Audio In 1 600Ωbalanced
9 Ground
** The auxiliary supply has a total current capability of 500mA. The current draw from all
connectors when added together must not exceed 500mA. The output is protected by a
thermal auto-reset fuse.

After unpacking the unit, connect the handset to the main body using the cable supplied.
Connect the power supply unit to the main body of the telephone and plug into an appropriate
supply. The unit will initialise and display a welcome message before going into its
operational state.
When in its operational state, the menu system is accessible and configuration may begin. The
menu is divided into two sections being 1, user menu, 2, installation / configuration menu.
The installation and engineer menu can be PIN code locked to prevent accidental alteration of
configuration settings. Ex factory these menus are unlocked
Keys Used During Configuration.
Scroll Up
Scroll Down
Menu
Clear
Alphanumeric keys
Volume Up
Volume Down

The Menu key has two functions. On first press it engages the menu system. Once in the
menu system, the menu key acts as carriage return to agree and select the values set in the
options field. Exiting the menu area causes the selected values to be stored.
The scroll up and down keys move through the menu options, and pressing menu selects the
desired option.
The clear key steps back one place in the selection process. For example, if tone set has been
selected, then operation of the clear key will step back one place to sellcall options.
The volume up and down keys are used when configuring audio related options.
Menu Structure.
User Menu
Installation Menu (may be pin code protected)
Menus In Order Of Presentation
User Menu
Selcall Status Sets the outgoing status in selcall signalling
Set Radio Channel Used in DS32 mode only
Headset Volume Range 0 to 99
Handset Volume Range 0 to 99
Default speaker Vol Range 0 to 99
Keypad Beeps Click-Pip-Off
Set Time Hrs –Mins
Set date DD –MM –YY
Display Contrast Range 0 to 9
Set Microphone Source Internal –External
Lamp & Button test Reports on display buttons pressed
Set Ident alpha tags Input alpha tags on a per ident basis
Set Status alpha tags Input alpha tags on a per status basis
Set Channel alpha tag Input alpha tag for channel
Set Default Channel Sets the power-up channel
F Key Channels Used in M80 mode only
Software Version Reports presently installed software version number
Install Menu
Emulation Mode Determines base station keying options
Set Mic Gain Use Vol UP/Down to set selected microphone gain.
Selcall Tone set Select tone set to be used
Tone length Set in mS the selcall tone length
Selcall ident size Set number of digits (variable) in ident
Selcall status size Set number of digits (variable) in status
Selcall codes Sub menu for setting all selcall codes
Set Rx Call code
Set RX emergency code
Set RX ack to TX

Set RX ack to close down call
Set RX ack to interrogate
Set RX ack to locate
Set TX call code
Set TX code for interrogate
Set TX code for locate call
Set TX code for close down
Set TX code for ack to RX call
Set TX ack to night service
Ack timeout Set how long system waits for ack
L.E.T. Set link establishment time delay
Call Stack Option Set how the call stack functions
Leading Rept tone Set if leading repeat tone is on or off
Circulating Calls Special Function used with Philips Voting Systems
Alert Tone Default Set if enabled at power up
Alert Tone Type Intermittent or continuous tome
Call Printer Turn logging printer on/off
RX Vox time Set how long input vox hangs
Motorola Func. Set the Motorola keying options
Talk through mode Set local (via DRC-1) or remote via Base Station
Night Service Lock Sets lock out time
Teleconnect Lock Sets lock out time
Group Connect Timer Set how long group connects are established.
Line Proving Sets line proving (TT holdoff) on/off
Background mute Used when controlling switch in DRC32 mode
FAC Key Set function of FAC key
Trim Line O/P Trim line output level
Trim LineI/P Trim line input level
Open Collector OP Set how pin 5 Aux connector is triggered
Password Set Pin code and turn protection on
Engineering Adjustments.
Ex factory the DRC-1 will be set to system peak levels of –10dBm to line, and if selected, the
tone keying will be –18dB down on system peak or –28dBm.
The trim adjustments found in the installation menu permit adjustment of these levels over the
range of -2 to -22 dBm.
Setting the correct line levels can be achieved in one of two ways depending upon the type of
test equipment to hand. Method 1 requires an ordinary AC milivoltmeter calibrated in dBm
and terminated in 600Ω. Method two requires a selective tone measuring set with a bandwidth
of 100hz. Both require an audio oscillator.
Method 1.
In the installation menu set keying to DC.
In the installation menu set talk through to Local.
Connect an audio oscillator to the line input pins of the line port.
Connect the AC milivoltmeter to the Aux port audio output pins 2 & 7.
Set the audio oscillator to 1Khz –20dBm.

From the installation menu select trim line input
Adjust the line input for a reading of –20dBm on the meter
Store this value (press menu)
Increase the line input level to –10dBm and check output is also –10dBm
Increase the input level to 0dBm and check output remains at –10dBm +2dBm-0
Transfer the meter to the line output port and set input level to –20dBm
Select trim output level and set level on meter for –20dBm, store this value.
Increase line input level to 0dBm and check output level remains at –10dBm +2dBm-0.
Theory
Limiting within the DRC1 amplifier chain is set to start at around –10dBm. The initial setting
process at –20dBm is undertaken at a level which will be well outside of the limiting range.
By setting the initial level on the auxiliary ports, the input gains are set to a known value, and,
out of limiting. The output is then set against this known value.
Method 2.
From the installation menu set keying to 2970Hz, store this value (press menu).
From the installation menu set talk through to local
Connect the selective measuring set to the line output pins on the line port.
Set the measuring set to 2970Hz and a bandwidth of not more than 100Hz
From the installation menu select trim line output level
Whilst pressing the PTT key adjust the line output level for –28dBm as seen on the selective
measuring set. Store this value (press menu).
Place an audio oscillator onto the line input pins of the line port
Set the oscillator for 1Khz –20dBm
Set the selective measuring set to 1Khz 100Hz band width.
Press talk through (led on)
From the installation menu select trim line input
Adjust the trim until the output is –20dBm. Store value (press menu).
Increase the line input level from the oscillator by 10dB
Check that a corresponding increase is seen on the selective measuring set.
Increase the line input to 0dBm, and check output is –10dBm +2dBm-0.
Theory. The key tone level has a fixed ratio to peak level of –18dB or –28dBm. By setting
the line output level whilst measuring the key tone the line output amplifiers are calibrated
and the gain values stored. Setting the input to –10dBm and adjusting the input amps for –
10dBm as seen on the output calibrates the internal system gain to 0dB. The base station
installation should be adjusted for nominal –10dBm levels, however using the DRC-1 line
trim facility permits local adjustments of the full path loop gain.