Midian TRA User manual

TRA
TELEPHONE TO RADIO ADAPTER
INSTRUCTION MANUAL
Manual Revision: 2006-10-31
Software Version: 4.2 & Higher
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American Communication Systems
Discover the Power of Communications
™
TO ORDER –VISIT http://www.ameradio.com

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1. SPECIFICATIONS
General
Operating Voltage 11 - 16 VDC
Standby Current 22 mA
Off-hook Current 50 mA
Ringing Current 400 mA
Inputs
Receive Input Level 50 mV RMS minimum
Receive Input Impedance 100 KW
Dynamic Range 25 dB
Frequency Range 280-2800 Hz
Sinad Ratio <8 dB
DTMF Twist 10 dB
Band Width DTMF ±2.5%
Band Width Five Tone See Table 2
Band Width Motorola Two Tone ±1.3%
Band Width General Electric Two Tone ±1.6%
Band Width Reach ±1.7%
COR Click Counter 1 - 9
Click Timeout .0 - .9 seconds
Outputs
Ringing Output 33 Hz, 70V RMS
Ringing Period 2 sec on, 4 sec off
Call Reminder Ring 160 msec
Call Queuing Ring 160 msec
Busy Tone 500 msec on, 500 msec off
PTT Output Current 200 mA
Audio Output Level 1 Volt Peak to Peak
Audio Output Impedance 1KΩ/27KΩ
Scanning
Channel Stepper 1 - 10 channels/second
Mechanical
Standard Dimension 4.25" x 3.25" x 2.00"
Operating Temperature -30° to +60° C

Installation Instructions
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Midian products utilize CMOS integrated circuits, which are susceptible to damage from high static charges. Be sure to
follow standard anti-static procedures when handling, including using grounded work stations and soldering irons and
wearing grounding bracelets. Please be careful when selecting wire colors. It is sometimes difficult to distinguish
between the grey, black, and brown wire colors under fluorescent lighting. We suggest using Color-Bright/Color-
Corrected or incandescent lighting. If in doubt, compare wire positions on board layout for correct color code.
Wire Function Instructions
Black Ground (P1 Pin 1) Connect to nearest ground point.
Red 11-16 VDC (P1 Pin 9) Connect to switched B+ in radio.
Grey COR/COS Busy Lockout
(P1 Pin 3) Connect to point in Squelch or CTCSS circuit that changes logic level
when a carrier is received. Program desired polarity in System
Parameters. A radio whose squelch circuit provides a logic low or a
logic high can readily turn the COR transistor on and off.
Orange RX/Tone Input (P1 Pin 11) Normally connect to a squelched point in the receiver. Alternately
connect to an unsquelched audio point, usually the high side of the
volume control or discriminator output, if squelch input is used.
Light brown Squelch Output (P1 Pin 5) Optional. Connect to point in radio's squelch circuit that normally
changes logic level with carrier. The polarity is set by selecting polarity
of squelch diode D3 using JU7. Resistor R88 can be changed to provide
more or less current. Do not conflict with grey lead. This lead is not
necessary for the TRA to function. The TRA has its own internal
squelch/mute to block earpiece audio to the telephone.
Yellow TX Mod Audio Out (P1 Pin
8) Connect to modulator circuit. Use high impedance point in radio. Low-Z will cause low frequency rolloff across tone output coupling cap C39 and
tone output resistor R59. In Low-Z mic circuits, it might be necessary to
short out resistor R59 with jumper JU6.
Dark Brown PTT Out (P1 Pin 7) Connect to the radio's PTT switch. The micro now has control of PTT,
time out timer, and busy lockout. The VOX controls the micro which
controls PTT output.
Violet Scan (P1 Pin 2 Step or
Binary LSB) Connect to synthesizer push button channel stepper switch (select
desired channel scan type in Decoding Parameters). For binary,
connect to Least Significant Bit (first bit) on radio's binary address line.
White Binary Scan (P1 Pin 6
Binary Second Bit) Connect to second bit on radio's binary address line.
Blue Binary Scan (P1 Pin 12
Binary MSB) Connect to Most Significant Bit (third bit) on radio's binary address line.
Green Horn (P1 Pin 4) Provides a 0-9 second momentary ground through FET transistor Q10.
RJ11 Connector (2 in
parallel) Plug in any standard single line phone or cordless phone. Phones can be plugged into both of these and connected throughout the house in
rural phone applications. Note: The hybrid adjustment pot in the TRA
must be set to match the characteristics of a particular type of phone.

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2. OPERATION
Midian’s TRA is a telephone to radio adapter that can be
used in a wide variety of situations, including: mobile
telephone, rural telephone, in-plant telephone systems,
interfacing office telephones to tone & DC remotes,
interconnect, and mobile to mobile telephone applications.
The TRA has three decode numbers, ANI, 10-number
memory dial and last number redial. The TRA will output
in both two-tone and five-tone formats.
2.1. Controls and Indicators
The TRA is controlled by the Off Hook Condition and the
Keypad of any Touch Tone®telephone, including cordless
phones. When the phone is taken off hook, the TRA
checks for an open channel and then sends ANI if that is
programmed. Dial tone is heard in the earpiece unless
the channel is busy, in which case a busy tone will be
heard. Upon receipt of dial tone, the user can begin
dialing.
2.2. Making Calls
In all cases in this section, to make a call, take the phone
off the hook. A dial tone should be heard, unless the
channel is busy, in which case a busy tone will be heard.
Incorrect entries can be cleared at any time by pressing
the # key. When finished, simply hang up the phone.
2.2.1. MAKING VOICE CALLS IN LOCAL/TONE/DC
REMOTE CONTROL
To make a voice call in any of these systems, follow the
instructions above. If dialing has been disabled, and no
ANI is programmed, when the user picks up the telephone
the TRA will allow the VOX circuit to key up the transmitter
whenever the user talks. At this point, the user can call a
mobile and carry on a conversation.
2.2.2. MAKING CALLS FOR IN-PLANT PAGING
To make and in-plant page, follow the instructions above.
Using the primary and secondary dialing features, the
TRA can be programmed to dial two types of signaling
formats based upon digit length. For example, the user
could dial a three digit number for two-tone sequential and
a five digit number for five-tone paging. Or, the primary
and secondary dialing locations could be programmed for
Touch Tone.
The user can now dial the desired number. When the
tone sequence is completed a tone prompt will be heard
indicating to the user that he can now give a voice
message. The user can stay on-line at this point and talk
to the unit they called, provided they called a talk-back
paging/portable. If the user called a simple pager, they
should hang up after the message is completed.
2.2.3. MAKING CALLS FOR RADIOTELEPHONE
APPLICATIONS
To make and in-plant page, follow the instructions above.
ANI and Dialing can be accomplished using the following
method:
a) Upon going off hook, the TRA will scan to an empty
channel, automatically send ANI, and then a dial
tone will be heard from the base station.
b) After receiving dial tone, do one of the following:
1. Enter the desired number and press *. The
TRA will automatically dial the sequence.
2. Enter the desired number and wait. The TRA
will pause for the keyboard auto dial period
programmed in Auto Dial Time and then dial
the sequence.
3. Press * followed by a digit 0-9 to dial one of
the ten stored numbers.
4. Press ** to redial the last number entered.
c) Disconnect ANI is automatically sent upon hang up.
2.3. Answering Calls
2.3.1. ANSWERING CALLS USING PTT CLICKS
When the user of a mobile unit wishes to call the base
station, he may rapidly key his microphone button several
times. The TRA will count the number of clicks that are
programmed in N-Click Decode, and if they arrive within
the time out period programmed in N-Click Timeout, the
TRA will generate a 70V ring to signal the telephone
receptionist, who may in turn page anyone throughout the
building to pick up the line to which the TRA is connected,
and answer the call. If the line rings at each phone, a
receptionist might not be required.
The phone user simply talks into the microphone and the
VOX will then key up the base station or Tone/DC
Remote. When finished, simply hang up the phone. The
user should monitor the channel for any other traffic to
make sure he does not cause interference. The Busy
Lockout feature can also provide this protection when
programmed in Busy Lockout.
2.3.2. ANSWERING CALLS FOR IN-PLANT PAGING
Mobile or portable radios that are equipped with Touch
Tone encoders for Talk Back paging can call into the base
station using the address programmed in Decode
Numbers 1, 2, or 3. The unit will ring and the phone user
will proceed as described above.

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2.3.3. ANSWERING CALLS FOR RADIOTELEPHONE
APPLICATIONS
When a unit is called, the TRA generates a 70V RMS ring
signal that activates the bell on the telephone. The TRA
tip/ring is capable of ringing several phones. When the
phone is taken off hook, only voice is transmitted when
the RTI-800 Interconnect is used. Other terminals require
ANI when the TRA comes off hook. When the phone is
placed back on hook, the disconnect ANI is transmitted to
the mobile telephone terminal thereby terminating the call.
3. PROGRAMMABLE FEATURES
See programming worksheet, pages 13-14.
3.1. Decode Numbers
When the DTMF, Five-Tone or Two-Tone decoder (as
programmed in Decode Format & Tone Detect Time)
receives a number it compares it with Decode Numbers
1, 2, and 3. Each location holds up to 8 digits followed by
a special code that determines the unit's response. The
decode digits may be any DTMF tone pair. The ring code
must be one of the following:
1 - Standard telephone ring, ANI when answered
2 - Standard telephone ring, no ANI when answered
7 - 30 second key up for locating stolen radio
8 - Reset internal test call lamp and call reminder tone
9 - Unit deadbeat disable (see below)
If a match is found the unit will do one of the following:
a) Begin ringing (codes 1 and 2).
b) Key transmitter for 30 seconds (code 7).
c) Reset internal test call lamp and call reminder tone
(code 8).
d) Change deadbeat disable status (code 9).
When the unit begins ringing it will continue to do so until
the phone is taken off hook, the carrier is lost, the
preprogrammed ring time has elapsed, or a DTMF A tone
is received, which resets the TRA. If the call is not
answered, a single short ring pulse will be generated
every 1 to 99 seconds, depending on the setting in Call
Reminder Interval, to alert the user that a call was
received during his absence. This feature can be reset by
quickly taking the receiver off and on hook (800 msec
flash).
In the RTX-compatible format, the TRA decoder uses the
DTMF digits A and D in the following manner. The
scanner looks for a D collect tone at the start of the
decode sequence. All other digits are ignored until a D
tone is received. Upon receipt of a 150 msec A tone, the
TRA will remute and resume scanning.
Ring code 7, when assigned to a decode register, will
send back a 30 second carrier for triangulation on a lost or
stolen unit. Ring code 9, when assigned to a register, will
disable the VOX/PTT output function, preventing the user
from keying up on a channel, and it will mute the receive
audio. The unit is still capable of decoding a phone
number in order to reset the deadbeat disable feature.
3.2. Connect & Disconnect ANI
The Automatic Number Identification locations contain the
connect and disconnect ANI sequences. There is an
entry for Connect ANI, and one for Disconnect ANI.
Each location can be programmed with 0 to 8 digits.
The RTX-compatible format requires a * or a # in front of
the ANI or in place of the ANI. If the * or # is in front of the
ANI, it will be sent at the same speed as the ANI is
programmed. If the * or # is used in place of the ANI, it
will be sent for the time programmed in Single Digit Tone
Time.
3.3. Transpond ANI
Transpond ANI can be programmed in this location for a
0 to 8 digit transpond sequence. The unit will send this
sequence after decoding a number and prior to ringing.
Note that the TRA transponds on Decode Number 1
(Individual Call) only. There is no transpond on Decode
Numbers 2 and 3, which are usually used for Group Call
and All Call, because this would cause "mid air collisions"
of the transpond tone.
3.4. ANI & Secondary Dialing Format
ANI & Secondary Dialing Format control the ANI format
and timing for the first tone and subsequent tones.
•Number of Digits: This determines whether this
format will be used for the dialing format. (See
Primary Dialing Format, below, for additional
information.
•ANI Format: Choose this from the ANI, Dial,
Transpond, and Decode Modes Table.
•Time 1: This setting controls the duration of tone 1.
A separate first tone timing makes it possible to
create a preamble tone. If nothing is entered in the
first timing field, the unit will default to the industry
standard timings for that format.
•Time 2: This setting controls the duration of tone 2.
If a time is entered in Time1 but nothing is entered
in Time2, the unit will encode all tones for the
timing entered in Time1.
3.5. Primary Dialing Format
The dialing format is programmed here in the same
manner as the ANI format. Choose a format from the
ANI, Dial, Transpond, and Decode Modes Table and set
the desired tone timings.
When a keyboard sequence is entered, the TRA first looks
at the number of digits entered and compares this number
to the Number of Digits value entered here. If the length
of the entered sequence matches this, and Primary
Dialing Format contains a valid format, then the primary
dialing format is used to encode the sequence. If the
length of the entered sequence does not match required
number of digits, then the length is compared with the
Number of Digits value in ANI & Secondary Dialing
Format. If a match occurs, the secondary format is used
to encode the sequence. If the length of the entered
sequence does not match either setting, an error tone
prompt is returned and the TRA waits for another to be re-

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entered. A length of 0 in either location will allow you to
dial any length sequence. You cannot have a 0 in both
locations if you are doing dual type dialing. The primary
dialing format Number of Digits must be set to a defined
length and the secondary dialing format Number of Digits
, when programmed to a 0, can send any length from 1-11
digits.
The TRA uses the number of digits entered before the
user presses * or the Auto Dial Time expires. For
example, a system could have the following settings:
Primary Dialing Format Number of Digits: 4
Primary Dialing Format: 1 (DTMF format)
ANI & Secondary Dialing Format # of Digits: 5
ANI & Secondary Dialing Format: 50 (CCIR format)
In this case, if four digits are keyed into the telephone, the
TRA will dial in the primary format⎯DTMF. If five digits
are entered on the keyboard, the TRA will dial in CCIR
format⎯the secondary dialing format.
3.6. Transpond Format
The transpond format and tone lengths are programmed
in the same manner as the ANI and Dialing formats. (See
above)
3.7. Decode Format & Tone Detect Time
Choose a Decode Format from the ANI, Dial,
Transpond, and Decode Modes Table and set the
desired Tone Detect Time here. (See Table 4.) The
decoder uses a sampling and averaging technique to
improve the signal to noise ratio. Therefore, the decode
tone detect time for formats other than DTMF should be
set at 1/4 to 1/5 the encode tone timings and should be
set in increments of 5 ms. For example, if the encode
timings are set to 20 ms, the decode timings should be set
to 5 ms; if the encode timings are set to 100 ms, the
decode timings should be 20 to 25 ms.
If DTMF is chosen for the decode format, then Time 1
determines the maximum inter-digit time between tones,
not the detect time as used in five-tone or two-tone. This
prevents falsing between short and long codes. When the
tone disappears, the gap time is measured. If another
digit arrives before the time has elapsed, it is appended to
the decode buffer. An incoming DTMF sequence isn't
compared to any Decode Numbers until the last tone has
been received. This prevents falsing on longer numbers
(i.e., decode number 1234 will not respond to 12345.) Set
up a long timeout of 1 second or more if decoding manual
dialing.
3.8. Transmit Parameters
Transmit parameters control the operation of the TRA
during a call.
•Trunking Delay: This determines the period the
TRA will delay after initial keyup before transmitting
the ANI to allow the TRA-equipped trunked radio to
find and to connect to a channel with an
interconnect for TRA-to-Landline conversations.
•Front Porch/Lead-In Delay: This determines the
period of time the TRA will wait with no modulation
after applying PTT and before encoding the ANI or
dialing sequence. This gives the repeater or base
time to open and pass audio.
•Back Porch/Lead-Out Delay: This determines the
period of time the TRA will wait with no modulation
after sending the ANI or dialing sequence before
releasing the PTT. This feature is necessary in
Basic's RT5 and RT6 Terminal.
•Single Digit Tone Time: This sets the encode
length of any single digit during ANI or dialing. (For
example * up, # down)
•COR Refresh Period and COR Refresh Width:
These settings respectively set the length of time
between transmission bursts and the width of the
burst used to prevent some full-duplex systems
from disconnecting a half-duplex or simplex user
while listening to the phone line side of the
conversation. This is usually unnecessary in Touch
Tone interconnects.
•Dialing Enabled: This can be set to inhibit dialing
for Voice Call, Decode Only, and Tone & DC
remote applications. When the phone is taken
offhook, the TRA automatically keys the transmitter
and then transmits its ANI after waiting for the time
set in Front Porch Lead-In Delay. The micro then
unkeys, allowing the simplex mobile to hear dial
tone. At this time, the user can enter the desired
number on the telephone Touch Tone pad.
•Auto Dial Time: This can be used to set a fixed
period of time after which the TRA will automatically
send a pre-entered string of digits. Thus, if during
the keyboard entry of the dialing sequence, the
user has not pressed any more keys within the auto
dial time, the TRA will automatically send the digits
entered instead of waiting for a * to instantly start
dialing. In the duplex mode, the transmitter does
not unkey, and the receiver is able to hear dial
tone.
3.9. Decoding Parameters
Decoding parameters control the operation of the TRA
after a number has been decoded.
•Ring Period: This controls the length of time the
unit rings. The unit ANI’s on the "busy" channel
during the ring interval.
•Horn Period: This controls the length of time that
an optional horn/external bell will energize. The
unit ANI’s on the "busy" channel during the ring
interval.
In the TRA, there is an additional decoding format called
N-click. This format is normally used for In-plant Paging
systems. N-click allows a user to click the PTT of a
mobile or handheld several times rapidly, which is
received as a logic-state change on the COR Input of the
TRA. This, in turn, can be used to ring an operator or
receptionist.
•N-Click Decode: This programs the number of
clicks needed to activate the ringer.

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•N-Click Timeout: This sets the maximum time
allowed between clicks before the click decoder is
reset.
Typically, N-Click Decode is programmed for 5 to 7
clicks. Fewer clicks can result in falsing on noise. N-
Click Timeout is typically set to 0.1 to 0.2 seconds.
Programming too long a time here may also result in
falsing. The TRA automatically rings when decoding N-
clicks.
•Hot Dialing Time: This programs the Hot Dialing
time from 0.0 to 9.9 seconds. This is how long the
PTT will remain up between keypad entries.
•VOX Hold Timer: This timer prevents the PTT
from dropping out between words, and can be set
between .0 and .9 seconds. This timer is normally
programmed from .5 to .8 seconds.
•Scan Step: This permits selecting either three line
binary scan (for a maximum of 8 channels) or step
scanning for radios employing push button channel
steppers.
3.10. System Parameters
Miscellaneous system parameters are programmed here.
•Queuing Signal Delay: This sets the transmit
Queuing Signal Delay time. When making a call in
an RTX system, the scanner looks for a non-busy
channel after the user comes off hook. (A channel
is considered idle if no carrier is sensed.) If the TRA
fails to find an empty channel when the user comes
off hook, the TRA generates a busy tone. After the
user hangs up, the TRA enters a Queuing mode,
while it looks for an available channel. After a
channel has been clear for the time programmed
here, the TRA will ring the telephone for
approximately 160 msec to inform the user that a
channel has become available.
•COR Active Input Level: This determines
whether a ground or V+ indicates a busy channel.
•Squelch Active Input Level: This determines
whether a ground or V+ is used to squelch the
radio audio output amplifiers. The polarity of diode
D3 may also need to be reversed using JU7. In
normal operation, it is not necessary to use the
Squelch Output wire, because the earpiece audio
in the telephone handset is muted by the TRA and
the radio speaker serves no purpose.
•Busy Lockout, # Channels to Scan: Entering 00
disables both busy lockout and radio channel
scanning. Entering 01-16 determines the number
of channels to be scanned. When using binary a
maximum of eight channels can be scanned (three
lines). When step scanning, a maximum of sixteen
channels is available. During step scan the radio is
scanned in a circle. The TRA needs to know when
it has gone through the circle so that it can
determine whether all channels are busy and
should give a busy indication and start the queuing
timer.
The channel scanner controls an open-collector output
that is used to step the radio to the next channel or the
Least Significant Bit (LSB) of a binary address. (See
installation section for the Violet Wire.) This can be wired
to the channel-advance button on many synthesized
radios or to the LSB of radios with binary channel
advance.
•Scan Pulse Time/Synthesizer Lock Time: This
sets length of time that the scan output is active. In
step radios this time should be set for a period that
guarantees that the output is recognized by the
radio's step channel advance input circuit. In
binary radios this time would represent how long
the synthesizer takes to lock.
•Scan COR Detect Time: This sets the minimum
length of time that the radio takes to advance and
lock on to and provide a Carrier Present indication
to the COR Input lead.
During decode in RTX-compatible systems, the channels
are scanned for a DTMF D collect tone. Once a DTMF D
tone is found, the scanner remains locked on the channel
until the number has been decoded. If it matches one of
the Decode Numbers (1, 2 or 3), scanning is disabled
while ringing occurs. Answering the call during ringing will
lock the scanner on the current channel.
•Dial Tone and Talk Beep: This Dial Tone function
determines whether or not the TRA internally
generates its own Pulsating Dial Tone while waiting
for a number to be dialed. This feature is generally
used for In-Plant Paging systems. The Talk Beep
feature enables an audible tone after paging tones
have finished. Entering a 0 disables both the dial
tone and talk beep. A 1enables the dial tone and
disables the talk beep. A 2enables the Talk Beep
but disables the dial tone. Entering 3enables both
the dial tone and talk beep. See Table 12.
•System Type: This indicates to the TRA the type
of system in which it is being used. Enter a 1if the
unit will operate in half duplex; enter a 2if the unit
will operate in simplex; and enter a 0 if the unit will
operate in full duplex.
3.11. System Timers
The settings in this location control various timers. After
an ANI is sent, the call length timer is started.
•Call Limit Time: This sets the maximum length of
time a call may last before forcing a disconnect.
Programming this to 000 will disable the timer.
Setting this to 001 to 999 will set the timer to run for
that many seconds. A warning beep in the
earpiece is generated one minute before auto
disconnect.
•VOX Keyup Limit: This is the maximum length of
time that the TRA will generate PTT with a
continuous voice input, before timing out. This
prevents background noise from keeping the TRA
keyed continuously if the telephone was
accidentally not placed back on the hook. Setting
this to 00 will disable timeout; setting it to 01-99
allows the unit to operate for that many seconds.
•No VOX Activity Disconnect Time: If the TRA's
VOX has not detected any voice activity within the

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period of time entered here, it will force disconnect.
This is a safety feature to prevent the TRA from
tying up the system when a handset is inadvertently
not placed back on hook. Setting this to 00
disables this feature; setting it to 01-99 delays
disconnect for that many seconds.
•Call Reminder Interval: This sets the length of
time between reminder rings. After decoding a call,
the TRA will ring for the time programmed in the
Ring Period in Decoding Parameters. If the call
is not answered during the ring time, the TRA will
produce a very short reminder ring (approximately
160 msec) to tell the user that a call was received
during his absence.
4. PROGRAMMING
Attach a standard telephone to the TRA "PHONE" input.
Take phone off hook, then depress and hold down the "#"
button. While monitoring "TP3" with an oscilloscope,
adjust R27 for a reading of 650 mv (P. to P.) This is a
preliminary setting to produce an adequate DTMF level for
programming the TRA.
4.1. Entering Program Mode
Press # and hold it down while taking the phone off hook.
Release the #, and two beeps will be heard. Enter the
following number sequence on the telephone keypad:
2 7 1 8 2 8 1 8 2 8 4
After this has been entered, the unit will beep three times,
indicating that programming mode is active.
4.2. Programming a Location
To change the contents of a system parameter, key in the
required data and press
* nn
where nn=location 01-14. If fewer digits are entered than
the register requires, trailing zeros are assumed. Extra
digits are ignored.
For instance, to enter the sequence 1234 as the connect
ANI, enter:
1 2 3 4 * 04
To exit the programming mode, press
* 00
The unit will respond with a long beep and resume normal
operation.
The DTMF characters A, B, C, D, *, and # are
programmed by using a quick flash on the hook switch,
which allows the 2, 5, 8, and 0 buttons to represent A-D.
(The middle column of the telephone keyboard replaces
the fourth column on a 16-button keyboard.) The * and #
characters, with a quick flash on the hook switch,
represent themselves. This is necessary for the * and #,
because # serves as a clear key, and * serves as an entry
key during normal operation.
For example, to program the connect ANI with the number
12A*, it would be necessary to enter the following
sequence:
1 2 <flash>2 <flash>* *04
4.3. Programming the Memory Dial Numbers
Press # and hold it down while taking the phone off hook.
Release #. Two beeps will be heard. Key in the number
0 0 0 0 0 0. The unit will respond with three beeps
indicating that the memory locations are unlocked.
Key in each number (up to 11 digits), and press * followed
by 0-9. The unit will then store the number into the
memory dial location selected, and will beep twice to
indicate successful programming.
To exit programming mode, hang up the telephone.
For example, the number 520-884-7981 would be stored
in memory dial number 3 by the following steps:
1. To enter programming mode, press # while going
off hook, release #, and then dial 000000.
2. Enter the number 5208847981.
3. Press *3 to store the number.
4. Exit programming mode by hanging up the
telephone.
5. TRA SETUP PROCEDURES
Program the unit as desired using the programming
sheets on page Error! Bookmark not defined.. Pay
particular attention to setting the COR polarity, as this
controls the Busy Channel Lockout and Busy Tone. Also,
set the VOX timing to a comfortable setting; we
recommend .5-.8 seconds. You may want to let your
customer make the final determination on the VOX timing.
5.1. In-Plant Paging Setup
When the telephone handset is taken off hook, a dial tone
will be heard if Dial Tones is set to 1. Enter the desired
two-tone or five-tone paging code and set the modulation
to 3.3 KCs using Mod Pot R58.
Then, using the "5" button on the Touch Tone phone, set
modulation to about 3.3 KCs using TX Audio Gain Pot
R27. Peak voice should now be going out at about 4 KCs,
assuming the radio was properly set at 5 KCs maximum.
The TX Audio Gain Pot R27 should be approximately mid-
range for most telephones. The voltage on Pin 1 of U5
TP1 should be approximately 1.25 Volts peak to peak
when pressing the "5" on the Touch Tone phone.
If the injection point to the radio is Low Z and the
maximum tone output level is insufficient, install jumper
JU6, which shorts out R59, lowering the output
impedance. Then repeat above steps.
Using a service monitor, with a 1 KC test tone set to 3.5
KC of deviation, inject an RF signal into the receiver
sufficient to quiet it, and set RX Gain Pot R34 so that test
point 2 is set at 1.5 vp-p (500 mV RMS).

9
To set earpiece volume, adjust R17 to a comfortable level.
Do not set this level too high as this can cause hybrid
ringing.
NOTE: The hybrid balance pot R13, has been set at the
factory using a standard telephone. The transmit audio
level pot R27 has been factory set to about mid-range and
so has the receive earpiece level pot R17. R27 and R17
and should not need readjustment. You may need to
readjust the hybrid balance R13. The simplest method is
to turn up the receive earpiece level pot R17, and transmit
audio level pot R27. You will then notice that when the
hybrid balance pot R13 is adjusted, there will be a null
between a low frequency howl and a high frequency howl.
Set the hybrid balance pot in the quiet zone between the
two howls, then turn down the receive input and the ear
piece levels according to the instructions above, and reset
the TX audio level pot R27 to the factory setting or to the
point of 3.3 kHz of deviation when pressing a 5 on the
telephone's touch tone pad. If either the transmit or
receive audio path levels are turned up too high, there
may be some noise heard during conversation that
sounds like the hybrid is on the verge of singing. If this
occurs, lower the TX and/or RX level controls. Generally,
the hybrid pot may need readjustment if you change from
one manufacturer or type of telephone to another.
5.2. Trunked Radiotelephone Setup
When the telephone handset is taken off hook, a dial tone
will be heard if the ANI was received and validated at the
repeater terminal. Enter the desired phone number and
set the modulation to 3.3 KCs using Mod Pot R58.
Then, using the "5" button on the Touch Tone phone, set
modulation to about 3.3 KCs using TX Gain Pot R27.
Peak voice should now be going out at about 4 KCs,
assuming the radio was properly set at 5 KCs maximum.
If the injection point to the radio is Low Z and the
maximum tone output level is insufficient, install jumper
JU6, which shorts out R59, lowering the output
impedance. Then repeat above steps.
Using a service monitor, with a 1 KC test tone set to 3.5
KC of deviation, inject an RF signal into the receiver
sufficient to quiet it, and set RX Gain Pot R34 so that test
point 2 is set at 1.5 vp-p (500 mV RMS).
To set earpiece volume, adjust R17 to a comfortable level.
Do not set this level too high as this can cause hybrid
ringing.
NOTE: The hybrid balance pot R13, has been set at the
factory using a standard telephone. The transmit audio
level pot R27 has been factory set to about mid-range and
so has the receive earpiece level pot R17. R27 and R17
and should not need readjustment. You may need to
readjust the hybrid balance R13. The simplest method is
to turn up the receive earpiece level pot R17, and transmit
audio level pot R27. You will then notice that when the
hybrid balance pot R13 is adjusted, there will be a null
between a low frequency howl and a high frequency howl.
Set the hybrid balance pot in the quiet zone between the
two howls, then turn back down the receive input and the
ear piece levels according to the instructions above, and
reset the TX audio level pot R27 to the factory setting or to
the point of 3.3Khz of deviation when pressing a 5 on the
telephone's touch tone pad. If either the transmit or
receive audio path levels are turned up too high, there
may be some noise heard during conversation that
sounds like the hybrid is on the verge of singing. If this
occurs, lower the TX and/or RX level controls. Generally,
the hybrid pot may need readjustment if you change from
one manufacturer or type of telephone to another.
6. THEORY OF OPERATION
The receiver audio applied to the Orange RX Tone Input
lead will be present at connector P1 pin 11 feeding 3 basic
paths:
- the receiver earpiece audio via RX Gain Input Pot
R34 and U5A through U4A and Earpiece Level Pot
R17;
- the tone signal for DTMF decode through R62 and
Gain Control Feedback Resistor R63;
- and the two-tone/five tone circuit U6A and U6B.
Receive earpiece audio is enabled/disabled by U4A and
controlled by pin 27 of the microprocessor. This path,
normally disabled, is enabled after the TRA sends its ANI.
If the channel is busy, the microprocessor generates a
Busy tone on pin 20 and applies it to U4 Pin 12 The
amplified voice audio is applied to hybrid transformer T2,
which drives the telephone handset. Trimpot R13 is the
trans-hybrid isolation balance control.
Audio/tones are fed to U8, DTMF decoder, via U4C Pin 4.
Gain for U8 is determined by the ratio of R62/R63, tone
acquisition time by the RC time constant, C42, R64 and
R65. With the values shown, this timing is approximately
35 msec.
U6A—along with U6B (a Schmidt trigger)—acts as a low
pass filter for processing two-tone and five-tone when
decoded by the microprocessor at Pin 41.
Relay RLY1 is used to switch the telephone handset from
the ringer transformer T1 to the balanced hybrid
transformer T2. The ringer, composed of T1, Q1, and Q2
and associated components, generates 70V RMS when
ringing. The 33 Hz ringing frequency is generated by the
micro at pin 24 and 28. These two signals are 180
degrees out of phase and are integrated by R6, R8, C6
and C7. The opto isolator U2 monitors this voltage during
each cycle. If the telephone handset is taken off hook
during ringing, the voltage drops, causing U2 Pin 5 to go
high. This causes the micro to terminate ringing.
Resistors R10, R11, and Q5 act as the off hook detector
when making or terminating a call.
The transmit audio, voice and tones, are generated in the
telephone handset and appear at hybrid transformer T2
terminal 10. Amplified by U5-B, which is then fed to U4-B
and U4-C. U4-C is turned on by the microprocessor
during dialing so that the Touch Tone decoder can see the
dialing sequence to tell the micro to regenerate its own
dialing sequence. During this time, U4-B blocks handset
Touch Tone audio from going out the low pass filter Q7

10
and Mod Pot R58. When U4-B is ready to re-encode the
tones, it will switch the modulation path over to the DAC
output coming in from Pin 1 of U4-B.
Transmit telephone audio is applied to the low pass filter
when the micro switches on U4-B Pin 2. With JU6
installed, the output impedance is approximately 1KW,
and the output impedance is approximately 27KW if
jumper JU6 is not installed.
U5-C is the VOX amplifier which feeds transistor Q4,
which acts as a detector instantly charging C19 which has
about a 50 msec time constant. This signal causes
Schmidt trigger U5-D to tell the micro to key up the
transmitter with an additional VOX delay time which has
been programmed in Vox Hold Timer. The micro asserts
PTT out by turning on Q9.
Squelch is controlled by Transistor Q8 and the polarity is
selected by Jumper JU7. When using positive squelch
the 47K resistor may be lowered if more current is
needed. The horn transistor Q10 is a VMOS power FET
and provides a momentary ground to honk the horn for the
time programmed in Horn Period.
Channel Scanning. There are two types of channel
scanning on the TRA, binary and step scanning. The
binary scan uses a three line address on P1-2, P1-6 and
P1-12. When binary is employed remove Q11 and install
a jumper from its base to its collector. In the step
scanning Q11 is normally installed and the base collector
jumper is omitted. Q11 is an open collector circuit which
can be used to step push button type radios. The type of
scan is selected in Scan Step. Busy Lockout, #
Channels to Scan controls busy lock out and the number
of channels to scan. When using the step scan feature a
maximum of 16 channels is available When using the
binary method a maximum of 8 channels is available.
This is due to the limitation of 3 binary address lines.
MIDIAN CONTACT INFORMATION
Midian Electronics Inc.
2302 East 22nd Street
Tucson, Arizona 85713 USA
Orders: 1-800-MIDIANS
Service: 520-884-7981
Fax: [phone]
E-mail: [email protected]
Web: http://www.midians.com/

11
7. PROGRAMMING TABLES
TABLE 1: RING CODE PROGRAMMING
RING CODE FUNCTION
1 STANDARD TELEPHONE RING,ANI ON ANSWER
2 STANDARD TELEPHONE RING,NO ANI ON ANSWER
7 30 SECOND KEYUP FOR LOCATING STOLEN RADIO
8 RESET CALL LAMP &CALL REMINDER TONE
9 UNIT DEADBEAT DISABLE
TABLE 2: ONE,TWO &FOUR TONE TIMING SEQUENCE
FORMAT CALL SEQUENCE 1ST TONE GAP 2ND TONE
MOTOROLA 1+1QUICK CALL 2 INDIVIDUAL CALL TONE &VOICE 1SEC 0 3 SEC
GROUP CALL 0 0 8 SEC
TONE ONLY .4 SEC 0 .8 SEC
TONE ONLY BATTERY SAVE 2.7 SEC 0 .8 SEC
REACH TWO TONE REACH SLOW 2SEC 25 MS .7 SEC
REACH FAST 150 MS 25 MS 150 MS
REACH GROUP CALL TWO TONE 5SEC 0 0
GENERAL ELECTRIC GENERAL ELECTRIC TYPE 99 1 SEC 0 1.5 SEC
NEC GROUP CALL
A 6SEC 1SEC .25 SEC 3SEC
B 6SEC 1SEC 0 3 SEC
C 4SEC 1SEC 0 1 SEC
D 3SEC .4 SEC 0 .4 SEC
L 3SEC .5 SEC 0 .5 SEC
M 4SEC .4 SEC 0 .8 SEC
TABLE 3: SEQUENTIAL SINGLE FREQUENCY CODES &TIMINGS
TONE CODE EUROPEAN FIVE/SIX TONE FREQUENCIES IN HZMOTOROLA
NUMBER DIGIT EEA CCIR ZVEI DZVEI DDZVEI NATEL EIA MODAT
TONE 0 0 1981 1981 2400 2200 2400 1633 600 637.5
TONE 1 1 1124 1124 1060 970 1060 631 741 787.5
TONE 2 2 1197 1197 1160 1060 1160 697 882 937.5
TONE 3 3 1275 1275 1270 1160 1270 770 1023 1087.5
TONE 4 4 1358 1358 1400 1270 1400 852 1164 1237.5
TONE 5 5 1446 1446 1530 1400 1530 941 1305 1387.5
TONE 6 6 1540 1540 1670 1530 1670 1040 1446 1537.5
TONE 7 7 1640 1640 1830 1670 1830 1209 1587 1687.5
TONE 8 8 1747 1747 2000 1830 2000 1336 1728 1837.5
TONE 9 9 1860 1860 2200 2000 2200 1477 1869 1987.5
REPEAT TONE R 2110 2110 2600 2400 970 1805 459 487.5
GROUP TONE G 1055 2400 2800 885 885 1995 2010 ---
ALARM TONE A 2400
TONE WIDTH (MS) 40±4 100±10 70±15 70±15 70±15 70 33±.5 40±5
SEQ LENGTH (MS) 200 500 350 350 350 350 165 280
MAX INTERTONE TIME (MS) 4 7.5 15 15 15 0
MIN GAP BEFORE/BETWEEN SEQ (MS) 100 290 140 140 140 33
ENCODER TOLERANCE ±1% ±8HZ±1.5% ±1.5% ±1.5% ±1.5% ±.1%
MUST DECODE BW ±1% ±1% ±1.5% ±1.5% ±1.5% ±16HZ
MUST REJECT BW ±3% ±3% ±4.5% ±4.5% ±4.5% NS

12
TABLE 4: ANI, DIAL,TRANSPOND &DECODE MODES
# MODE TIME 1 TIME 2 # MODE TIME 1 TIME 2
00 NONE UNUSED UNUSED 33 MOTOROLA N FIRST TONE NEXT TONE
01 DTMF TONE ONTONE OFF 34 MOTOROLA P FIRST TONE NEXT TONE
02 35 MOTOROLA Q FIRST TONE NEXT TONE
03 36 MOTOROLA R FIRST TONE NEXT TONE
04 RTX-COMPATIBLE TONE ONTONE OFF 37 MOTOROLA S FIRST TONE NEXT TONE
05 38 MOTOROLA T FIRST TONE NEXT TONE
20 MOT GENERAL FIRST TONE NEXT TONE 39 MOTOROLA U FIRST TONE NEXT TONE
21 MOTOROLA A† FIRST TONE NEXT TONE 40 MOTOROLA V FIRST TONE NEXT TONE
22 MOTOROLA B FIRST TONE NEXT TONE 41 MOTOROLA W FIRST TONE NEXT TONE
23 MOTOROLA C FIRST TONE NEXT TONE 45 GE FIRST TONE NEXT TONE
24 MOTOROLA D FIRST TONE NEXT TONE 46 REACH FIRST TONE NEXT TONE
25 MOTOROLA E FIRST TONE NEXT TONE 50 CCIR FIRST TONE NEXT TONES
26 MOTOROLA F FIRST TONE NEXT TONE 51 EEA FIRST TONE NEXT TONES
27 MOTOROLA G FIRST TONE NEXT TONE 52 EIA FIRST TONE NEXT TONES
28 MOTOROLA H FIRST TONE NEXT TONE 53 ZVEI FIRST TONE NEXT TONES
29 MOTOROLA J FIRST TONE NEXT TONE 54 DZVEI FIRST TONE NEXT TONES
30 MOTOROLA K FIRST TONE NEXT TONE 55 DDZVEI FIRST TONE NEXT TONES
31 MOTOROLA L FIRST TONE NEXT TONE 56 NATEL FIRST TONE NEXT TONES
32 MOTOROLA M FIRST TONE NEXT TONE 60 MODAT FIRST TONE NEXT TONES
† - Motorola A is not a Motorola standard.
TABLE 5: MOTOROLA CODE PLAN
FIRST CODE TYPE
DIGIT A* B C D E F G H J K L M N P Q R S T U V W
1 11 11 11 11 11 11 11 11 11 11 11 23 23 23 24 24 25 34 34 35 46
2 22 22 22 22 22 13 13 13 14 14 15 22 22 22 22 22 22 43 43 53 64
3 33 33 12 12 12 33 33 33 41 41 51 33 33 33 42 42 52 33 33 33 56
4 44 12 44 15 21 44 31 31 44 44 16 44 32 32 44 44 26 44 44 36 44
5 55 13 14 55 16 31 55 16 55 16 55 32 55 26 55 26 55 55 36 55 55
6 66 21 21 21 66 14 15 66 15 66 66 24 25 66 25 66 66 35 66 66 66
7 31 41 51 61 41 51 61 45 61 61 42 52 62 45 62 62 45 63 63 45
8 23 24 25 26 34 35 36 54 46 56 34 35 36 54 46 56 54 46 56 54
9 32 42 52 62 43 53 63 51 64 65 43 53 63 52 64 65 53 64 65 65
* A is not a Motorola Standard.
TABLE 6: MOTOROLA GENERAL ENCODING PLAN
FIRST DIGIT OF
PAGER CODE TONE A GROUP TONE B GROUP
1 1 1
2 2 2
3 1 2
4 4 4
5 5 5
6 2 1
7 4 5
8 5 4
9 2 4
0 4 2
TABLE 7: MOTOROLA REED GROUPS
TONE REED GROUP 1 REED GROUP 2 REED GROUP 3REED GROUP 4REED GROUP 5REED GROUP 6
NUMBER REED
CODE FREQ HZ REED CODE FREQ HZ REED CODE FREQ
HZ REED
CODE FREQ
HZ REED
CODE FREQ
HZ REED
CODE FREQ HZ
1 111 349.0 121 600.9 138 288.5 141 339.6 151 584.8 191 1153.4
2 112 368.5 122 634.5 108 296.5 142 358.6 152 617.4 192 1185.2
3 113 389.0 123 669.9 139 304.7 143 378.6 153 651.9 193 1217.8
4 114 410.8 124 707.3 109 313.0 144 399.8 154 688.3 194 1251.4
5 115 433.7 125 746.8 160 953.7 145 422.1 155 726.8 195 1285.8
6 116 457.9 126 788.5 130 979.9 146 445.7 156 767.4 196 1321.2
7 117 483.5 127 832.5 161 1006.9 147 470.5 157 810.2 197 1357.6
8 118 510.5 128 879.0 131 1034.7 148 496.8 158 855.5 198 1395.0
9 119 539.0 129 928.1 162 1063.2 149 524.6 159 903.2 199 1433.4
0 110 330.5 120 569.1 189 1092.4 140 321.7 150 553.9 190 1122.5

13
TABLE 8: GE TYPE 99 TABLE I
GROUP AB C
TONE # FREQ FREQ FREQ
1 592.5 607.5 712.5
2 757.5 787.5 772.5
3 802.5 832.5 817.5
4 847.5 877.5 862.5
5 892.5 922.5 907.5
6 937.5 967.5 952.5
7 547.5 517.5 532.5
8 727.5 562.5 577.5
9 637.5 697.5 622.5
0 682.5 652.5 667.5
DIA 742.5 HZ
TABLE 9: GE Type 99 Table II
100’STONE REED GROUPS FOR
DIGIT 1ST TONE 2ND TONE
0 A A
1 B A
2 B B
3 A B
4 C C
5 C A
6 C B
7 A C
8 B C
TABLE 10: REACH TWO-TONE
SEQUENTIAL -- FAST OR SLOW
1ST DIGIT
OF CODE GROUP FOR
1ST TONE GROUP FOR 2ND TONE
1 A C
2 C A
3 B D
4 D B
5 A D
6 D A
7 A E
8 E A
9 B E
0 E B
TABLE 11: REACH TWO-TONE &SINGLE TONE PAGING FREQUENCIES
TONE GROUP A GROUP B GROUP C GROUP D GROUP E
NUM CHN FREQ CHN FREQ CHN FREQ CHN FREQ CHN FREQ
1 11 2704 21 1912 26 1608 36 1137 46 804
2 12 2612 22 1847 67 1553 37 1098 47 776
3 13 2523 23 1784 68 1500 38 1061 48 750
4 14 2437 24 1723 69 1449 39 1025 49 725
5 15 2354 25 1664 30 1400 40 990 50 700
6 16 2274 26 1608 31 1352 41 956 51 676
7 17 2196 27 1553 32 1306 42 923 52 653
8 18 2121 28 1500 33 1261 43 892 53 631
9 19 2049 29 1449 34 1219 44 862 54 609
0 20 1980 30 1400 35 1177 45 832 55 588
TABLE 12: DIAL TONE &TALK BEEP
DIGIT DIAL TONE TALK BEEP
0 OFF OFF
1 ON OFF
2 OFF ON
3 ON ON

Enter Programming Access Code: 2 7 1 8 2 8 1 8 2 8 4 on telephone keypad (see Section 3)
For this feature Enter These Codes
Decode Number 1 (1-8 digits) plus Ring Code (1 digit)
Enter the desired decode number plus Ring Code. The last digit entered will become
the ring code. For example, if the desired decode number is 12345 with ring code 1,
enter the sequence 123451 followed by * 01.
* 01
* 02
Decode Number 2 (1-8 digits) plus Ring Code (1 digit)
Program in the same manner as Decode Number 1.
Decode Number 3 (1-8 digits) plus Ring Code (1 digit)
Program in the same manner as Decode Number 1.
* 03
Connect ANI (0-8 digits)
This will be transmitted when PTT is pressed and/or released, depending on the
ANI Position setting in Transmit Parameters.
* 04
* 05
Disconnect ANI (0-8 digits)
Program in the same manner as Connect ANI.
Transpond (0-8 digits)
This sequence will be transponded only on decode of Decode Number 1; this prevents
"mid-air collisions" on group call. Note: The Auxiliary Input in Transmit Parameters
turns transpond ON or OFF.
* 06
ANI/Secondary Dialing Format &ToneLengths(11 digits)
A) Number of Digits (1-9, 0=any)
Setsthe number of digits accepted in the SecondaryDialing Format ; 0 disables this feature.
B) ANI Format (00-60; see table 4)
Enter the two digit code that corresponds to the desired format from Table 4.
C) Time 1 (0.000-9.999 seconds)
Enter the desired time for the first tone. This separate timing makes possible a
preamble tone. If nothing is entered, industry standard timings will be used.
D) Time 2 (0.000-9.999 seconds)
Enter the desired time for subsequent tones. If nothing is entered , all tones will be
encoded for the length that is entered in Time 1.
* 07
Primary Dialing Format & Tone Lengths (11 digits)
A) Number of Digits (1-9, 0=any)
Setsthe number of digits acceptedin the Primary Dialing Format ; 0 disables this feature.
B) Dialing Format (00-60; see table 4)
Program in the same manner as ANI/Secondary Format & Tone Lengths.
C) Time 1 (0.000-9.999 seconds)
Program in the same manner as ANI/Secondary Format & Tone Lengths.
D) Time 2 (0.000-9.999 seconds)
Program in the same manner as ANI/Secondary Format & Tone Lengths.
* 08
Transpond Format (10 digits)
A) Transpond Format (00-60; see table 4)
Program in the same manner as ANI Format & Tone Lengths.
B) Time 1 (0.000-9.999 seconds)
Program in the same manner as ANI Format & Tone Lengths.
C) Time 2 (0.000-9.999 seconds)
Program in the same manner as ANI Format & Tone Lengths.
* 09
Decode Format & Tone Detect Time (6 digits)
A) Decode Format (00-60; see table 4)
Program in the same manner as ANI Format & Tone Lengths.
B) Time 1 (0.000-9.999 seconds)
When using DTMF, this is an interdigit timer. We recommend 1-2 seconds. When
using 5-tone, enter a time that is 1/5 of the encode tone time in increments of 5
ms.
For example, if the encode time is 25 ms/ tone, set the decode time to 5 ms/tone.
* 10

For this feature Enter These Codes
Transmit Parameters (10 digits)
A) Trunking Delay (0-9 seconds)
Enter a trunking delay of 0-9 seconds. This allows the radio to scan for an empty
interconnect channel.
B) Key-Up Delay (.0-.9 seconds)
When dialing the transmitter will key, pause for the key-up delay, & then send the
tones.
C) Back Porch/Lead-Out Delay (.0-.9 seconds)
This is a time after sending ANI that the transmitter will release PTT.
D) Single Digit Tone Time (0.0-9.9 seconds)
Sets the length of time for any single-digit sequence during ANI or dialing.
E) COR Refresh Period (00-99 seconds)
Sets length of time between transmission bursts. This prevents some full-duplex
systems from disconnecting during conversations.
F) COR Refresh Width (.0-.9 seconds)
Sets width of transmission burst. This prevents some full-duplex systems from
disconnecting during conversations.
G) Dialing Enabled (0=disabled, 1=enabled)
This enables dialing. In some systems dialing will not be desired.
H) Auto Dial Time (0=disabled, 1-9=seconds)
This limits the time between manually-entered digits. If enabled & the user
pauses
for more than this time, the TRA will automatically send the entered sequence.
* 11
Decoding Parameters (9 digits)
A) Ring Period (00-99 seconds)
Enter a ring period of 00-99 seconds.
B) Horn Period (0-9 seconds)
This sets the length of time the optional horn relay will be energized.
C) N-Click Decode (0=disabled, 1-9 =enabled)
The number of PTT clicks needed to activate the TRA ring tones.
D) N-Click Timeout (.0-.9 seconds)
Enter the maximum time allowed between clicks to activate N-Click decode.
E) Hot Dialing Time (0.0-9.9 seconds)
The amount of time PTT will remain up between entries.
F) VOX Hold Timer (.0-.9 seconds)
Amount of time that PTT will remain open on an unmodulated signal.
Recommended: .5 to .8 seconds.
G) Scan Step (0=Step, 1=Binary)
Selects between 3-line binary scan or step scanning.
* 12
System Parameters (11 digits)
A) Queuing Signal Delay (0-9 seconds)
The unit will monitor the channel until it has been idle for the time entered here and
then generate 3 beeps to indicate that the channel is no longer busy.
B) COR Active Input Level (0=GND, 1=V+)
Sets COR Active logic state.
C) Squelch Active Input Level (0=GND, 1=V+)
Sets Squelch Active logic state.
D) Busy Lockout, # Channels to Scan (00=off, 01-16=on, # chan.)
Enables Busy Lockout and sets the number of channels to scan.
00 disables both scanning and busy lockout.
E) Scan Pulse Time/Synthesizer Lock Time (.00-.99 seconds)
Sets length of time that scan output is active.
F) Scan COR Detect Time (.00-.99 seconds)
Sets minimum length of time for radio to lock on to carrier.
G) Dial Tone and Talk Beep
(0=Both OFF, 1=Dial Tone Only, 2=Talk Beep Only, 3=Both ON)
Determines whether TRA internally generates dial tone and beep after dialing.
H) System Type (0=Duplex, 1=Half-duplex, 2=Simplex)
* 13
System Timers (9 digits)
A) Call Limit Time (000-999 seconds; 000=disabled)
Sets the maximum length of time before disconnect.
B) VOX Keyup Limit (00-99 seconds; 00=disabled)
Length of time TRA will generate PTT with continuous voice input, before timing
out.
C) No VOX Activity Disconnect Time (00-99 seconds)
Length of time before disconnect when no voice is detected.
D) Call Reminder Interval (00-99 seconds)
If call is not answered by user, a reminder ring is generated at the interval set
here.
* 14
Enter *00 to exit programming mode (unit will emit long beep)

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