Midian Electronics PTA-16 User manual

1
PTA-16
Parallel Tone Remote Adaptor
Manual Revision: 2012-10-14
Covers Loader Firmware Revisions:
1.70 & Higher
Covers Application Firmware Revisions:
1.00 & Higher
Covers PCB Revisions:
E

2
TABLE OF CONTENTS
Specifications 3
General Information 4
Hardware Installation 5
Hardware Alignment 7
Jumper Settings 9
Controls & Indicators 10
Operation 11
Product Programming 12
Tone Signaling Formats 13
Theory of Operation 14
Technical Notes 16
Contact Information 16

3
SPECIFICATIONS
Voltage/Current:
Operating Voltage: 13-18 VDC
Operating Current (standby): 125 mA
LED Current: 4 mA
Fuse Protection Auto Resettable with surge suppression: 300 mA
RX Input from Radio:
Compression Range: Not more than 3 db change for 30 db increase above threshold
Frequency Range: 300-3000 Hz
Notch Filter Depth: 45 db relative to 1 KHz
DTMF Decode Sinad Ratio 9 dB
Dynamic Range 30 dB
COR Input 0-5 V
TX Outputs to Radio:
Compression Range: Not more than 3 db change for 30 db increase above threshold
Notch Filter Depth: 45 db relative to 1 KHz
Output Impedance (TX): 600 Ohms or 22 K Ohms
Output Tone Level: 2/3 System deviation
PTT Out: Open-Collector or Relay
Dedicated Phone Line:
Input Level +10 to -25 dB
Input Impedance 600 Ohm Balanced
Output Level -20 to 0 dB pot adjustable
Output Impedance 600 Ohm
Fuse Protection Auto Resettable with surge suppression: 300 mA
Mechanical:
Dimensions: 1.45" H x 6” W x 7.6" L
Operating Temp: 0° to +50° C
Default Control Tone Frequencies & Timing:
Function Tone Frequency Level & Duration Function
Tone Default Level & Duration
High-Level Guard 2175 Hz 10 dBm for 120 msec F9 1150 Hz 0 dBm for 40 msec
Low-Level Guard 2175 Hz -20 dBm continuous F10 1050 Hz 0 dBm for 40 msec
F1 1950 Hz 0 dBm for 40 msec F11 950 Hz 0 dBm for 40 msec
F2 1850 Hz 0 dBm for 40 msec F12 850 Hz 0 dBm for 40 msec
F3 1750 Hz 0 dBm for 40 msec F13 750 Hz 0 dBm for 40 msec
F4 1650 Hz 0 dBm for 40 msec F14 650 Hz 0 dBm for 40 msec
F5 1550 Hz 0 dBm for 40 msec F15 550 Hz 0 dBm for 40 msec
F6 1450 Hz 0 dBm for 40 msec F16 2350 Hz 0 dBm for 40 msec
F7 1350 Hz 0 dBm for 40 msec F17 2450 Hz 0 dBm for 40 msec
F8 1250 Hz 0 dBm for 40 msec

4
GENERAL INFORMATION
Adaptor Mode:
Midian’s PTA-16 is a tone remote adaptor (tone termination panel) that allows for control of up to 16 radios in
parallel on one dedicated line by a tone remote controller. The 16 radios can be addressed individually (F1-F16)
or in simulcast (F17). The radio’s COR causes the PTA-16 to send 2175 Hz followed by the radio’s unique
function tone to identify the radio to the tone remote controller, which is automatically displayed on the controller’s
LCD. Additionally, the PTA-16 can also change channels on each radio using DTMF signaling from the tone
remote controller.
Useful in subways, railroads, etc.
2-wire or 4-wire (option) capability
Depending on the actual number of parallel units and line length/condition, a telco line amp may be required
to offset loading
Midian’s PTA-16 can be used with Midian’s TRC series tone remote controllers or another manufacturer’s tone
remote controller that uses EIA and industry standard F1-F16 function tones and a unique F17 function tone.
Mini-TRC Mode:
The PTA-16 can also operate as a tone remote controller. When connected to an audio source, grounding the
COR Input will cause the PTA-16 to encode the high-level 2175 Hz guard tone, followed by the programmed
function tone (F1-F16) and then followed by the continuous low-level 2175 Hz guard tone and the audio from the
remote audio source in order to cause a tone remote adaptor such as Midian’s TTC-1 or TTC-2 to key the base
station. Likewise audio can be received from the tone remote adaptor by the PTA-16.
The standard configuration of the PTA-16 is for a 2-wire system. A 4-wire option (TTC Option J) is available for
these types of systems.

5
HARDWARE INSTALLATION
Be certain to follow standard anti-static procedures when handling any of Midian’s products.
Getting Started:
The PTA-16 has a number of adjustment potentiometers and configuration jumpers. These have been adjusted
and configured at the factory for a typical installation. However, audio levels should be verified and adjusted (if
necessary) at the time of installation. Also, the configuration jumpers should be inspected prior to installation to
verify that they are in the right configuration. Jumper descriptions appear in the jumper settings section with a
quick reference table.
Line Interface
The line interface connector CON7 is a 10-pin RJ-45 style connector on the left side of the back panel.
2-Wire Operation: For a 2-wire installation, simply connect pins 5 and 6 (red and green) to the dedicated line.
This is the standard configuration for the PTA-16. See table 3.1.
Table 3.1
Pin Color 2-Wire
CON7-4 Black Not Used
CON7-5 Red Line 1
CON7-6 Green Line 1
CON7-7 Yellow Not Used
4-Wire Operation: For a single line 4-wire installation, connect pins 4 and 7 (black and yellow) for transmit audio
to the base station (Line In) and pins 5 and 6 (red and green) for receive audio from the base station (Line Out).
For this feature TTC Option J must be ordered and installed in the PTA-16. JP27 should be moved to the 2-3
position. See table 3.2.
Table 3.2
Pin Color 4-Wire
CON7-4 Black TX (Line In)
CON7-5 Red RX (Line Out)
CON7-6 Green RX (Line Out)
CON7-7 Yellow TX (Line In)
Diagram 3.1
1

6
Radio Interface:
CON6 and CON2 are located in the middle of the back panel and are used to connect the PTA-16 to the base
station radio or repeater. For Mini-TRC Mode only the power, ground, TX Output, RX Output and COR
connections are needed. The other connections are for the tone remote adaptor mode. The following are the
connection points:
CON6:
CON6-2 (Orange): COR: Tone Remote Adaptor Mode: Connect this lead to the busy detect of the radio. This
input is used to control whether audio should be passed down the line to the tone remote controllers. Generally
this line is not used, but if the base station has any low-level noise or hum this line will mute the noise until the
radio opens squelch and passes full audio. A logic low from the radio’s busy circuit will activate Q8. Mini-TRC
Mode: In the Mini-TRC Mode this input acts as a PTT input. This input when taken to ground causes the PTA-16
to generate the keying tones and allows voice audio to pass through the unit.
CON6-5 (Green): TX Output: Tone Remote Adaptor Mode: Connect to the microphone input of the base
station/repeater. Mini-TRC Mode: In the Mini-TRC Mode this is the RX audio from the tone remote adaptor.
Connect to the speaker audio input.
CON6-6 (Red): Battery (13-18 VDC): Connect this lead to 13-18 VDC from the base station/repeater.
CON6-7 (Black): Ground: Connect this lead to the base station’s or repeater’s ground.
CON6-8 (White): RX Input: Tone Remote Adaptor Mode: Connect the receive audio in the base station after
the sub-audible hi-pass filter and at some point that gives flat audio to the PTA-16. Speaker audio is fine if it is
single ended, but make certain the volume control cannot be turned down accidentally. Mini-TRC Mode: In the
Mini-TRC Mode this is the mic audio input. This input does not have a bias supply for a mic element. The audio
presented here should be from a dynamic mic or a carbon equivalent or electrets with its own amplifier/power
source.
CON6-9 (Blue): PTT Output: Connect this lead to the PTT on the radio. With JP1 installed in the 2-3 position, the
output is an open-collector to ground. With JP1 installed in the 1-2 position, the optional PTT relay is active low
upon contact closure with JP4 installed in the 2-3 position.
CON2:
CON2-3 (Violet): Binary Select 1: This output is an open-drain FET than can pull the radio’s channel select line
to ground. This line can be used with CON2-4, CON2-5 and CON2-6 for multi-line (2, 3 or 4 line) binary channel
selection.
CON2-4 (Yellow): Binary Select 2: This output is an open-drain FET than can pull the radio’s channel select line
to ground. This line can be used with CON2-3, CON2-5 and CON2-6 for multi-line (2, 3 or 4 line) binary channel
selection.
CON2-5 (Green): Binary Select 3: This output is an open-drain FET than can pull the radio’s channel select line
to ground. This line can be used with CON2-3, CON2-4 and CON2-6 for multi-line (2, 3 or 4 line) binary channel
selection.
CON2-6 (Red): Binary Select 4: This output is an open-drain FET than can pull the radio’s channel select line to
ground. This line can be used with CON2-3, CON2-4 and CON2-5 for multi-line (2, 3 or 4 line) binary channel
selection.

7
HARDWARE ALIGNMENT
The alignments are preset at the factory and should not need to be adjusted during installation. However, if an
adjustment is needed please follow the procedures below.
TX Input Line Level Adjustment:
1. With the dedicated line connected to the PTA-16, connect a line level meter to the red and green (2-wire) or yellow
and black (4-wire option) in bridging mode.
2. Configure the line level meter to generate continuous low-level guard tone (2175 Hz at -20 dBm).
3. Adjust RP13 while monitoring TP10 with an oscilloscope, so that TP10 shows 1.2 V p-p. Also verify that JP-26 Pin 2
shows 220 mV p-p.
TX Notch Filter Alignment:
1. Continue generating the low-level guard tone from the line level meter in the previous step.
2. Monitor TP8 with a Sinadder. The audio level of the Sinadder should be adjusted to hear the tone.
3. Adjust RP9 until the tone is at it’s most diminished point.
4. Adjust RP10 until the tone fully diminishes. If this step does not get rid of the tone go to step 5.
5. Repeat steps 3 and 4 until no tone is heard.
TX Bandpass Filter Alignment:
1. Reconfigure the line level meter to generate a continuous low-level guard tone (2175 Hz at -20 dBm).
2. Adjust RP7 while monitoring TP6 with an oscilloscope, so that TP6 is peaked.
TX Mod Level Adjustment:
1. Reconfigure the line level meter to generate a continuous 1 KHz tone at -10 dBm.
2. With JP25 in the 1-2 position the output impedance is 22 K. For radios with a 600 Ohm impedance put JP25 in the
2-3 position.
3. Adjust RP8 for full system deviation.
RX Input Line Level Adjustment:
1. With voice being received from the base station adjust RP3 while monitoring TP1 with an oscilloscope, so that TP1
shows around 700 mV p-p. Also verify that JP-22 Pin 2 shows around 180 mV p-p.
RX Notch Bandpass Alignment:
1. Generate the low-level guard tone (2175 Hz at -20 dBm) using the line level meter to the RX Input from the radio.
2. Monitor TP2 with a Sinadder. The audio level of the Sinadder should be adjusted to hear the tone.
3. Adjust RP5 until the tone is at it’s most diminished point.
4. Adjust RP4 until the tone fully diminishes. If this step does not get rid of the tone go to step 5.
5. Repeat steps 3 and 4 until no tone is heard.

8
RX Output Line Level Adjustment:
1. With voice being received from the base station adjust RP6 while monitoring the line out with a line level meter and
set for approximately -10 dBm on average voice or -5 dBm on peak voice.
Duplex Parallel Crossover Adjustment:
1. If the PTA-16 is ordered with the 4-Wire Option it may be necessary or desirable for one tone remote controller to
hear another and to pass its keying tone to the other tone remote(s) to activate the busy light. If so, set RP15 for a
level adequate to activate the busy indication on the other tone remote(s) and to a level that is comfortable.

9
JUMPER SETTINGS
The following table shows the default jumper settings and their function:
Jumper
Number Default Position Description
JP1 Fixed – 2-3 In PTT open collector transistor output
JP4 NA Not used
JP8 NA Not used
JP9 NA Not Used
JP13 NA Not Used
JP14 NA Not Used
JP15 NA Not used
JP20 1-2 In – 2-3 Out Active low versus active high selection for COR Input
JP22 1-2 Out – 2-3 In AGC Compander Circuit bypass
JP25 1-2 In – 2-3 Out 22K versus 600 Ohm impedance selection
JP26 1-2 Out – 2-3 In AGC Compander Circuit bypass
JP27 1-2 In – 2-3 Out 4-Wire Option
JP36 1-2 In Termination jumper
JP37 1-2 In Termination jumper
JP38 1-2 In Termination jumper
JP40 1-2 In Termination jumper
JP41 NA Not used
JP42 NA Not used
JP43 NA Not Used
JP44 NA Not Used
JP45 When in 2-wire mode not installed. When in 4-wire mode 1-2 is
installed for duplex crossover.
Jumper
Number Default Position Description
SJ1 1-2 Out – 2-3 Out Future Use
SJ2 1-2 Out – 2-3 Out Future Use
SJ3 In Future Use
SJ4 In Future Use
SJ5 In Future Use
SJ6 In Future Use
SJ7 In Future Use
SJ8 In Future Use
SJ9 In Future Use
SJ10 In Future Use
SJ11 In Future Use
SJ12 NA Not Used
SJ13 In Future Use
SJ14 In Future Use
SJ15 Out De-Emphasis jumper

10
CONTROLS & INDICATORS
Power Switch: This is a single pole toggle switch on the front left of the PTA-16. The down position is off and the
up position is on.
Power LED: This red LED indicates that power is applied to the unit and that the switch is on.
Transmit LED: This red LED indicates that the unit is applying push to talk to the base station or repeater.
DTMF LED: Shows presence of DTMF tones.
Carrier LED: This red LED indicates when carrier is detected on the base station radio.
Tone/Sync LED: This red LED indicates low-level guard tone is being received.
F1-F10 LEDs: The F3-F10 LEDs are inside and are visible with the lid removed for testing purposes. When
programmed to binary channel selection mode is enabled the F3, F4, F5 and F6 LED’s display in binary with F3
being the LSB and F6 being the MSB.

11
OPERATION
Tone Remote Adaptor Mode:
PTA-16 Selection: The tone remote controller can select the desired PTA-16 by selecting the appropriate
function tone (F1-F16 or F17 for simulcast). Upon receiving the programmed function tone, or F17 for simulcast,
the PTA-16 will give an open collector output to ground to cause the base station radio to transmit.
Transmit: Upon receiving the high-level 2175 Hz guard tone, followed by the function tone and the 2175 Hz
continuous low-level guard tone the PTA-16 will PTT the radio (CON6-9) by giving an open collector output to
ground, causing the base station radio to key. The voice will be transmitted to the radio via CON6-5.
Receive: Upon receiving audio/signaling from the base station radio the PTA-16 will generate the high-level 2175
Hz guard tone followed by the unit’s function tone to ID the unit to the tone remote controller. The PTA-16 will
then pass the audio/signaling to the line output to the tone remote controller.
Channel Change using DTMF: In addition to selecting the desired PTA-16 using function tones, a tone remote
controller equipped with DTMF dialing can change channels of the base station using DTMF tones. The DTMF
command to change channels is as follows:
PPUUCC
PP is a 2 digit prefix ID, UU is the unit ID (Function Tone) 01-16 and CC is the desired channel 01-16. When the
channel is changed the binary output of the PTA-16 will change the channel of the radio.
Mini-TRC Mode:
Transmit: Upon the COR input being taken to ground the PTA-16 will generate the high-level 2175 Hz tone for
120 msec, followed by 40 msec of the F1 function tone (1950 Hz) and then the low-level 2175 Hz continuously
until the COR input is released from ground. During this time the PTA-16 will pass the audio from the Mic Audio
Input through the 600-ohm balanced line driver to the dedicated phone line, telemetry link or microwave.
Receive: When a field radio keys up, the tone remote adaptor passes the voice down the line to the PTA-16. The
voice will then be passed through to the external speaker audio input.

12
PRODUCT PROGRAMMING
The PTA-16 requires the KL-4 and KL-4 Option A for programming. Reference the KL-4 manual for set-up of the
programming hardware and software.
At any time while programming the PTA-16, right clicking on an option will bring up a help file to explain the
parameter.
The KL-4 and KL-3 Option 4 plug into the 3.5 mm stereo plug on the front of the PTA-16.
Set the parameters of the PTA-16 to fit the application. Turn on power to the PTA-16 and send the program to the
unit.
After programming cycle power to the PTA-16 and remove the KL-4 and KL-4 Option A.

13
TONE SIGNALING FORMATS
Signaling Format Compatibility
In tone remote systems, the industry standard 2175 guard tone is filtered out by the tone remote adapter at the
base station so that it is not heard over the air. This filter can affect some 5-Tone and 2-Tone signaling formats
close to 2175 Hz. Tones within +/-70 Hz could be attenuated to a level such that they cannot be decoded by
receiving equipment. There are several ways to deal with this issue:
1. Choose a format that will not be affected.
2. Do not use the affected tone(s).
3. Change the guard tone.
The last solution involves re-tuning the notch filters on the PTA-16. This can be done at the factory upon request
(recommended). It also requires that the guard tone and notch filters on the tone remote controller be changed as
well. While Midian’s products allow for this, not all do. Please note that this issue often applies to decoding as
well. Tone remote controllers notch 2175 out of the receive audio as well. This possibility should be investigated if
decode problems are experienced. The following sections address the formats and tones that are likely to be
affected.
ZVEI: All ZVEI formats use 2200 Hz for either the ‘0’ or the ‘9’ tone. This is only 25 Hz away from the standard
guard tone frequency of 2175. The best solution to this problem is to simply not use the ‘0’ tone when encoding
DZVEI and not use the ‘9’ tone when encoding ZVEI or DDZVEI formats. Alternatively, the guard tone could be
changed to another frequency. If this is done, it should be at least 150 Hz away from the nearest frequency used
by the format. 2970 Hz is a common choice.
CCIR and EEA: CCIR and EEA both use the tone 2110 Hz as the ‘repeat’ tone. This tone indicates that the
current digit is the same number as the last digit. The best solution to this problem is to simply not use codes that
have repeating digits. That is to say, do not use a code where a digit appears next to itself in the code such as
‘12334’ which has two 3’s in a row. Another solution is to change the guard tone. If this is done, it should be at
least 150 Hz away from the nearest frequency used by the format. 2970 Hz is a common choice.
Other Affected Formats: REACH two-tone, tone group A, uses 2196 and 2121 Hz to represent the digits 7 and
8. Do not use tone group A if using this format. PLECTRON tones 2260 and 2164 should not be used.
Formats Not Affected: The following formats do not use tones between 2105 and 2245 and therefore should be
unaffected by the guard tone filter: AVCALL, DTMF, EIA, EUROSIGNAL, GE Type 99, MODAT, NATEL, Motorola
Quick Call I, and Motorola Quick Call II.

14
THEORY OF OPERATION
TX Voice Path:
Phone line audio from the tone remote controller is fed into the TX voice path in simplex mode through
transformer T1. In 4-wire mode it is fed into transformer T2 and is selected by jumper JP27. Both transformer
circuits have surge suppression and an auto-resettable polyswitch for lightning protection. They each have RF
chokes and RF bypass caps to keep out any RF that may get into the phone lines. For best results an extra Earth
ground connection is provided at J1.
Audio is input through Pin 2 of JP27 through a hi-pass filter C123 and RP13 to block any 60-cycle hum from an
unbalanced phone line. Audio is then passed into TX amp low pass filter U14:3. The low pass filter rolls off noise
above 3 KHz. It’s output is about 1.2 V p-p with -20 dBm with low-level guard tone on the phone line. The output
of this amp passes through compression amp circuit U14:4 and U7:2. Its output is about 155 mV p.p. This is the
threshold of compression. Jumper JP26 allows you to select the compressed audio or non-compressed audio.
When using short phone lines with stable levels you may choose to use the non-compressed audio as the audio
coming from the tone remote controller is already compressed. Several competing units do no employ the
compression circuit.
Pin 2 of JP26 is the input into a bi-quadratic filter U15:2, U15:1, and U15:4. The band pass output is on Pin 7 and
can be peaked using frequency tuning pot RP9. The frequency tuning 25-turn pot RP9 will tune over a range of 1
KHz from 2100 to 3100 Hz. The band pass output on Pin 7 is fed into notch null pot RP10 along with the voice
and Guard Tone through R179 into RP10. The two Guard Tone frequencies are 180 degrees out of phase and
cancel at the input of U15:3. From U15:3’s output the remaining voice is fed into C89 where an optional voice
scrambler may be installed. From the other side of C89 it is passed into mixer U14:2 and then output through a
high Z or low Z circuit to the base station’s modulator. This amplifier is also a mixer for the pulse width modulator
encoder.
RX Voice Path:
RX audio from the base station goes through hipass filter C39 and RP3. RP3 also serves as the RX input level
adjustment pot. This audio is then fed into amplifier U8:2 which acts as low pass filter for noise above 3 KHz and
if jumper SJ15 is installed it can give a 6 dB per octave de-emphasis if desired.
Audio from U8:2 is fed into the compression amplifier U7:1 and U14:1 or it can be bypassed around the
compressor using JP22. From JP22 it goes to C56 where an optional voice scrambler may be installed. From
there it passes through the notch filter to remove 2175 Hz voice components. This circuit works in exactly the
same way as the description for the TX Voice Path. Voice audio from the notch filter is input into the audio mixer
U18:4. This mixer also receives duplex crossover audio and MSK encoded audio. Out of the mixer they are then
input into the line amplifier (U20:1) which drives T1. The line amplifier has an enable transistor that is controlled
by the microprocessor. The micro can respond to the COR carrier input and enable this amplifier if necessary or
desirable via programming.
Signaling Path:
Signaling audio from T1 or T2 passes through the TX amp U14:3. Tone remote audio from input level pot RP13 is
fed into the Guard Tone state variable band pass filter and into the broadband function tone detector circuit via
U10:3. The Guard Tone frequency is normally 2175 Hz, and the high Q state variable filter has a 6 dB bandwidth
of about + or – 70 Hz. It is then fed into the Guard Tone detector U11:3 and Schmitt Trigger U10:1 and level
shifter Q23 to the microprocessor for frequency validation. Once it has been validated and checked for the proper
timing, the microprocessor then looks at the function tone output from Q22 and performs the monitor or frequency
function following the high-level Guard Tone command. U10:2 is a high gain amp for the function tone followed by
Schmidt trigger U10:4.

15
Power Supply:
13-18 VDC is input on the red wire of the Radio Interface connector and then into S1 the ON/OFF switch through
RF inductor L7 into a resettable polyswitch. D22 is a polarity protection diode that is designed to pop the
resettable fuse if power is hooked up backwards. C31 and C34 act as RF bypass caps after the RF inductor L7.
U6 acts as a 12 VDC regulator. Its output is fed to all of the analog circuitry and U14:2 acts a pseudo-ground
reference at approximately 6 VDC. The 12 VDC on the analog page schematic is also fed over to U4 which is a 5
VDC regulator shown on the digital page to run the microprocessor and the optional encoders/decodes and serial
chips.
Microprocessor Schematic:
The microprocessor utilizes a 16 MHz clock and is a flashable part. It communicates with the DTMF encoder
decoder U1.
On the right hand side of the microprocessor page we have all of the LED functions shown. See the Control and
Indicators section.
The F3-F6 outputs are open-drain FET switches that simply pull to ground to provide a logic low or provide
ground to energize a relay. F3, F4, F5 and F6 act as binary lines and the associated LED’s indicate the binary
selection.

16
TECHNICAL NOTES
No technical notes are available at this time.
MIDIAN CONTACT INFORMATION
MIDIAN ELECTRONICS, INC.
2302 East 22nd Street
Tucson, Arizona 85713 USA
Toll-Free: 1-800-MIDIANS
Main: 520-884-7981
E-mail: [e-mail]
Web: www.midians.com

1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
.001u
C71
INDUCTOR
L2
51R
R172
.001u
2KV
C169
1
TTC OPTION G
TTC OPTION H
VOICE SCRAMBLER
CON1
100K
R206
-
+
6
57
U1 :2
LM660
TP17
.1u
C157
.1u
C12
.47u
C175
-
+
2
31
411
U :1
LM324
.01u
C99
TP
SPARE
PAD3
0R
R2
100K
R91
-
+
9
10
U11:3
LM324
SA572
RECT_IN
3
ATK_CAP
4
G_OUT
5
THD_TRIM
6
VCC 16
GND
REC_CAP 2
G_IN 7
TRK_TRIM
1
U7:1
300 mA Resettable Fuse
OPTION J
F4
100K
R 3
10
10K1%
R177
47p
C77
470R
R133
-
+
13
12
14 U14:4
LM324
51R
R252
10K
R131
33K
R
100K
R9
-
+
6
5
7U11:2
LM324
10K
R96
10K1%
R174
P3100
OPTION C
TZ5
INDUCTOR
L6
.47u
C 5
.1u
C121
TP6
1K
R261
2
TP3
*
R21
B25
Q33
22K
R279
P0300
OPTION J
TZ9
1K
RP3
1K
R260 10K1%
R173
-
+
6
5
7U10:2
LM324
1u
C103
2.2K
R254
*
R29
4.7K
R156
3.3K
R242
LM4950
SHUTDOWN
2
BYPASS
GND TAB 5
GND 4
VDD 6
U20:2
.047u
C97
B25
Q22
100K
RP15
1u
C61
100K
R139
15K
R149
0R
R101
4.7K
R12
25
4.7K
R2 2
.22u
C113
TP19
*
R297
470K
R142
.47u
C39
.001u
2KV
C165
10K1%
R237
2.2K
R171
10K1%
R166
0R
R1 9
620R
R151
SA572
RECT_IN 13
ATK_CAP 12
G_OUT 11
THD_TRIM 10
VCC
16
GND
REC_CAP
14
G_IN
9
TRK_TRIM 15
U7:2
47K
R144
.22u
C55
9.1K
R73
100K
R2 4
.47u
C73
1K
R153
10K
R19
RJ11-4
1
2
3
4
BLK
RED
GRN
YEL
POTS
CON4
.1u
C126
.01u NPO
C156
470u
+C32
TP7
100K
R276
-
+
2
31
411
U14:1
LM324
INDUCTOR
L7
.47u
C162
330K
R125
.1u
C104
INDUCTOR
L1
*
R290
300 mA Resettable Fuse
OPTION C
F6
200K
R275
47K
R99
TP11
3
100p
C114
TP9
INDUCTOR
L5
BSS
Q20
10K1%
R250
10K1%
R247
P0300
TZ4
.047u
C96
47u
+C51
39K
R273
1
J1
EARTH CHASSIS GROUND
.22u
C
5K
RP4
*
Q35
10K
RP11
330K
R 5
470K
R191
.001u
2KV
C16
10K1%
R24
300 mA Resettable Fuse
OPTION C
F3
56K
R100
1.2M
R1
0R
R2 1
3.3K
R23
12
*
C64
47K
R14
330K
R126
750K
R192
*
R296
5K
RP10
43K
R121
.1u
C47
.22u
C40
7.5K
R263
10K
R1 0
-
+
9
10
U14:3
LM324
.022u
C59
1. M
R1 6
10K1%
R179
47K
R167
4
P0300
OPTION J
TZ
10K1%
R17
10R
R27
470R
R255
Y25
Q29
100p
C50
0R
R1 4
TP4
1K
R107
-
+
6
5
7U12:2
LM324
-
+
6
5
7
LM324
U14:2
-
+
6
5
7U15:2
LM660
1K
R162
.033u
C171
BSS
Q1
1K
RP6
.001u
C125
-
+
9
10
U10:3
LM324
-
+
13
12 14
U :4
LM324
10K1%
R246
BSS
Q25
1u
C101
1K
R 6
TP5
13
10K
R221
1K
R233
.47u
C15
.1u
C177
-
+
2
3
1
411
U10:1
LM324
1M
RP17
1K
R264
.01u
C75
470K
R2 0
TP20
.47u
C60
100K
R10
10K1%
R170
*
C100
*
C76
150p
C139
5
.47u
C107
47K
R120
*
R304
1K
R259
SJ13
TP22
P0300
TZ3
100K
R134
TP21
.47u
C106
47K
R145
.001u
C124
1K
R124
6. K
R95
.1u
C9
300 mA Resettable Fuse
F2
INDUCTOR
L4
300 mA Resettable Fuse
F5
LM4950
-
97
U20:3
LM4950
-
13
U20:1
1K
RP9
-
+
2
3
1
411
U11:1
LM324
4.7K
R150
-
+
9
10
U15:3
LM660
4.7K
R143
26
.001u
C42
-
+
2
3
1
411
U12:1
LM324
1.2M
R1 3
*
C179
TP14
.01u
C93
15K
R147
.1u
C127
10K
R 9
390K
R1 7
10K
R97
*
R243
.01u
C176
1. M
R1 1
.001u
2KV
C167
100p
C 6
10K
R90
330R
R231
JP34
-
+
2
3
1
411
U15:1
LM660
47K
R76
10K
R72
P3100
OPTION C
TZ7
10K1%
R165
TP1
6
BSS
Q27
-
+
13
12
14 U11:4
LM324
-
+
2
31
411
U1 :1
LM660
*
R303
P S
1 6
5
3 4
2
42TU016RC
T1
-
+
9
10
U :3
LM324
330R
R234
1K
RP5
470u
+C174
22K
R116
4.7K
R117
10K1%
R245
10K
RP13
100p
C43
1K
R 1
BSS
Q17
-
+
13
12 14
U1 :4
LM660
29
.001u
C111
47K
R137
P S
1 6
5
3 4
2
OPTION J
T2
1K
R251
1u
C4
.22u
C159
*
TZ1
1N4001
D22
47K
R241
150R
R141
10K
R220
1M
R129
330R
R2 9
7
.2K
R160
1K
R265
.001u
2KV
C170
.47u
C150
*
C102
10K1%
R169
10K
RP12
10K
R197
22K
R127
1M
RP16
560p
C37
33K
R176
P0300
TZ2
.1u
C36
10K
R74
330R
R211
10K1%
R239
-
+
6
57
U :2
LM324
TP2
33K
R193
.001u
C110
300 mA Resettable Fuse
F1
47K
R130
Y25
Q2
22K
R152
30
BSS
Q30
TP15
470K
R140
560p
C94
INDUCTOR
L3
10K
R 2
RJ45-10
1
2
3
4
5
6
7
9
10
CON7
LM7 12
VIN
1
GND
2
VOUT 3
U6
100K
R2 3
910K
R123
21
3
S1
SJ14
3.3K
R 4
P3100
OPTION C
TZ6
3.9K
R13
390K
R1 2
.1u
C49
22
CH1 47
OPTION C
TIP 1
RING 2
XMIT(-)
7
RCV
6
VCC
GND
10
RI
5
OFFHK
4
XMIT(+)
9
U13
1u
C52
100K
R277
.1u
C161
33K
R249
100K
R155
22K
R154
43K
R132
100K
RP
47K
R194
47K
R119
.22u
C 9
1M
R146
TP10
JP35
-
+
9
10
U1 :3
LM660
5K
RP7
.001u
C72
-
+
13
12
14 U10:4
LM324
1000p NPO
C79
47u
+C115
.1u
C129
23
P0300
OPTION J
TZ10
0R
R307
100K
R 7
1K
R232
10K
R262
.001u
2KV
C166
10K1%
R244
-
+
13
12
14 U12:4
LM324
30K
R240
TP1
330R
R106
-
+
13
12
14 U15:4
LM660
B25
Q23
.47u
C153
1u
C53
.47u
C10
9
300 mA Resettable Fuse
OPTION J
F7
.1u
C109
.1u
C163
62K
R274
-
+
9
10
U12:3
LM324
30K
R175
1M
R190
1M
R11
0R
R209
560K
R1 5
10K1%
R253
1K
R256
VAN_A
+12V
VAN_A
VAN_A
+5V
+5V
+5V
+5V
+12V
+12V
VAN_A
VAN_A
+12V
+12V
VAN_A
+5V
+5V
VAN_A
VAN_A
VAN_A
+12V
+12V
VAN_A
+12V
VAN_A
VAN_A
+12V
+12V
VAN_A
VAN_A
+12V
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
+12V
VAN_A
+5V
VAN_A
+12V
+12V
+5V
VAN_A
+VIN
+VIN
RX_LINE_ENABLE_DISABLE
ANTIVOX
VOX
PWM_1
DUPLEX_PARALLEL_CROSSOVER
RX_INPUT
FUNCTION_TONE
GUARD_HOLD_TONE
DTMF_DECODER_1
TELCO_RECV_MUTE
TX_OUTPUT_ENABLE_DISABLE
PWM_1
DTMF_DECODER_2
TX_IN_ENABLE_DISABLE
+13_TO_1 _VDC
RING
HOOK
SCR_TX_IN
SCR_TX_OUT
SCR_TX_IN
SCR_TX_OUT
SCR_RX_IN
SCR_RX_OUT
SCR_RX_OUT
SCR_RX_IN
SCR_MODE_IN
SCR_PTT_IN
TELCO_FEEDBACK_DISABLE
SCR_OFF_HOOK
TX_MOD_INPUT
SCR_COR
SCR_MODE_OUT
HLG_DET
GUARD_FUNCTION
GUARD_FUNCTION
TELEMETRY_PTT
OPTIONAL 4 WIRE TX ONLY
6 VOLTS
ANALOG REFERENCE
RX LINE AMPRX
LINE
LEVEL
AUDIO MIXER
COMPANDOR
RX INPUT
LEVEL
TX AMP
3 KC LOWPASS
300 Hz HIGHPASS
TX OUTPUT
LEVEL
GUARD/HOLD TONE NOTCH/
GUARD/HOLD TONE DETECTION
FUNCTION TONE DETECTION
BANDPASS FILTER
MOBILE PRIORITY
TELCO PTT
GUARD/HOLD TONE BANDPASS FILTER
TTC-1 POTS OPTION
BASE
STATION
BASE
STATION
COMPANDOR
GUARD/HOLD TONE
NOTCH NULL
DUPLEX
CROSSOVER
LEVEL
SEE MCU PAGE
SEE MCU PAGE
RX NOTCH BANDPASS TUNING
2000 TO 3100 HZ.
TX NOTCH BANDPASS TUNING
(0 05) (0 05)
(MULTITURN)
(1206)
(0 05)
2000 TO 3100 HZ.
(0 05) (0 05)
(0 05)
(1206)
(MULTITURN)
2 WIRE RX/TX
4 WIRE RX ONLY
2000 TO 3100 HZ.
approx. 700mvp-p
1 0mvpp@1Kc 400mvpp
approx. . Vpp@1Kc
Transmitting to Remotes at -10 db
TP4 should be approx 540mvp-p.
Approx. 1.2Vpp
@-20dbm
Low Lvl Guard -
RP13 at center
MICROWAVE (M LEAD)
TELEMETRY RADIO RECV AUDIO
TELEMETRY RADIO MODULATION
TTC-1 TELEMETRY RADIO OPTION
TELEMETRY RADIO OPTIONAL
approx.
@1Kc
220mvpp@-20dbm
Low Lvl Guard
Approx 1Vpp@-20dbm
LowLvl Guard
TP6 Approx 600mvpp
@-20dbm
Low Lvl Guard
Approx 750mvpp
@-20dbm@1Kc
Approx 3.7Vpp
@-10dbm@1Kc
RP at center
TP6 Approx 5. Vpp
@+10dbm
High Lvl Guard
TP21 Approx 1V
Middle
High Lvl Guard
+5V
.1u
C119
0R
R272
.1u
C11
330K
R203
3.3K
R200
1K
R199
100K
R201
33K
R202
.1u
C117
1u
C116
.001u
C34
560p
C31
.47u
C151
.47u
C152
TTC-1 ONLY
RX
LINE
LEVEL
75K
R26
100K
R205
750K
R204
15K
R207
15K
R20
.47u
C122
.1u
C123
6 p
C120
.001u
C1 0
.01u
C17
20p
C63
47p
C172
PTA-16
2 Wire ihs7503e1_pta16_2w
CJS
2005-01-17 GPC
2010-07-07
E1
2 of 2 7503
IDIAN ELECTRONICS, INC.
DATE:
DESIGN:
DWN BY:
REV:
APPR SCHE ATIC
COPYRIGHT © 2009
REV
SHEET PROJECT NU BER
DOCU ENT NA E
47K
R30
.22u
C1 1
0R
R309
21 A7
D24:1
31 A7
D24:2
31 A7
D23:2
21 A7
D23:1
SD1
D34
SD1
D25
*
D33
WIRE
)
))
)
11
22
33
JP27
)
))
)
11
22
33
JP26
(
((
(
11
22
33
JP22
JUMPER
)
) )
)
11 22 33
HI-Z JUMP 1&2
LO-Z JUMP 2&3
LO-Z HI-Z
JP25
11
22
JP36
11
22
JP40
11
22
JP37
11
22
JP3
1K
R310
1K
R311
NetC171_1
NetR1_1
NetR145_2
0R
R312
470p
C1 3
* = NOT INSTALLED
WIRE
11 22 33
JP45
1u
C1 2
10K
R353
100K
R355
BSS
Q40
SECONDARY_RX_LINE_EN_DE
0R
R350
TP23
TP16
VOICE_STORE 10K
R354
.47u
C1 4
PWM_2
2R
R351
4.7u
C35
4.7u
C3
4.7u
C44
10u
C112
10u
C54
10u
C69
10u
C173
2R
R352
2.2u
C56
JUMPER NO
RX AMP
3 KC LOPASS SHORT SJ15
OR DE-EMPHASIS OPEN SJ15
SJ15
2.2u
C 7
1u
C200
.001u
C202
560p
C203
INDUCTOR
L
0R
R35
0R
R357
10K
R94
.47u
C5
MSK_ENCODER
1000p NPO
C 1

1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
SJ10
SJ7
10K
R210
*
R235
1K
R39
1K
R69
10K
R40
100K
R305
16.0M
Y2
100K
R115
100K
R2 7
4
560p
C20
2.2K
R230
1K
R63
SJ6
22p
C131
100K
R226
0R
R214
1K
R292
1K
R32
B25
Q5
3
5
6
10
7
12
1
K2
DF2E-DC12V
SJ5
B25
Q7
4.7M
R3
SJ11
3
5
6
10
7
12
1
K3
DF2E-DC12V
B25
Q
1K
R293
22p
C133
1K
R295
PAD1
2.2K
R136
100K
R26
1K
R49
B25
Q4
.1u
C134
SJ4
1K
R294
4.7K
R306
1K
R41
3
TP12
*
C155
100K
R224
SJ3
4.7K
R3
4.7K
R46
22p
C3
1K
RP2
*
R213
BSS
Q12
*
R19
22p
C2
560p
C22
560p
C2
10K
R55
MC9S12D64CFUE
EXTAL 34
TXD0
64
VDDR 29
PA1
42
PA2
43
PA3
44
PE5
26
XTAL 35
PE3
37
PAD05
56
PT6
13
PB5
21
PP1
3PB4 20
PT7
14
PP3
1
PB0
16
PB1
17
PAD02
53
PA4 45
PP0
4
PP5
79
PAD03
54
PT0
5
RXD0
63
PT2 7
RXD1 65
TXD1 66
PAD00
51
VSSR
2
PT1
6
PA0
41
PB2
1
PB3
19
RESET 30
PB6 22
PE6
25
PB7
23
PP2
2
PP7
7
PE7
24
PAD01
52
PE4
27
PP4 0
PE1
39
PAD06
57 PA5 46
PT3
PT5
12
PA6 47
PA7 4
PE0 40
PE2
3
PM0 75
PM1 74
PM2 73
PM3 72
PM4 71
PM5 70
PJ6 69
PJ7 6
VSSPLL
33
TEST
36
VSS1
10
VSS2
50
VSSA
62
VSSX
76
VDDA 59
VREGEN 67
VDDX 77
XFC
32
VDDPLL
31
VDD2
49
VDD1
9
PAD07
5
BKGD 15
PT4
11
VRL
61
VRH
60
PAD04 55
U16
4.7K
R14
1K
R67
.1u
C145
100K
R222
1
2
3
4
5
6
7
9
10
SEE DOCUMENT 7053-INTFCABLE
FOR WIRE COLOR DESIGNATIONS
RJ45-10
CON2
560p
C26
3.5 MHz
Y1
1K
R229
SJ12
RJ45-10
1
2
3
4
5
6
7
9
10
SEE DOCUMENT 7503-INTFCABLE
FOR WIRE COLOR DESGINATIONS
CON3
1K
R61
560p
C23
1.2M
R7
.1u
C132
1K
R43
100K
R24
.22u
C13
100K
R52
100K
R113
BSS
Q11
BSS
Q9
100K
R291
1K
R37
4.7K
R4
6
.1u
C27
.1u
C146
.47u
C4
11
2233
SJ2
3
5
6
10
7
12
1
K1
DF2E-DC12V
560p
C24
BSS
Q15
100K
R2
2
2.2K
R1
100K
R114
.1u
C147
5
1K
R57
100K
R225
BSS
Q1
2.2K
R164
1K
R71
.1u
C5
*
C135
.47u
C 4
0R
R219
2954IM
RESET 5
OUT1 1
OUT2 2
GND 4
IN1
IN2
3
IC1
6
IC2
7
U4
100K
R30
1K
R45
4.7K
R53
1K
R65
100K
R2 5
B25
Q6
2.2K
R17
.1u
C144
RJ45-10
1
2
3
4
5
6
7
9
10
CON6
BSS
Q16
10K
R50
4.7K
R42
100K
R6
BSS
Q10
.22u
C137
BSS
Q13
1K
R59
560p
C21
*
C10
1K
R5
100K
R54
1K
R135
NOTE7
T1_IN 11
R1_OUT 12
T1_OUT
14
R1_IN
13
C1+ 1
C1- 3
C2+
4
C2-
5
VCC
16
V+
2V- 6
GND 15
R2_IN T2_OUT
7T2_IN 10
R2_OUT 9
U17
100K
R223
*
C9
10K
R31
*
C136
70
OSC1 OSC2 9
GS
3
IN-
2
St/GT
19
ESt
1
IN+
1
VREF
4
VCC 20
PWDN
6
INH
5
GND
10
STD 17
Q1 12
Q2 13
Q3 14
Q4 15
TOE 11
NC1
7
NC2
16
U1
10K
R25
560p
C25
SJ9
560p
C19
10K
R27
10K
R29
11
22
33
SJ1
10K
R44
22K
R51
1M
R12
BSS
Q14
1K
R47
2
5
1
SEE DOCUMENT 7503-PROGCABLE
FOR BOARD REV INFORMATION
J2
470K
R
SJ
1
JP31
BSS
Q34
+12V
+12V
+12V
+12V
+12V
+5V
+5V
+5V
+12V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+12V
+5V
+12V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
TX_MOD_INPUT
VOX
ANTIVOX
DUPLEX_PARALLEL_CROSSOVER
GUARD_HOLD_TONE
FUNCTION_TONE
RX_LINE_ENABLE_DISABLE
TELCO_RECV_MUTE
TX_OUTPUT_ENABLE_DISABLE
TX_IN_ENABLE_DISABLE
PWM_1
DTMF_DECODER_2
RING
SCR_MODE_IN
RX_INPUT
+13_TO_1 _VDC
HOOK
SCR_OFF_HOOK
SCR_PTT_IN
TELCO_FEEDBACK_DISABLE
+5V
SCR_COR
SCR_MODE_OUT
HLG_DET
DTMF_DECODER_1
TELEMETRY_PTT
PTT
MONITOR
F1
F2
COR
SPARE
RADIO
INTERFACE
PROG_IN
PROG_OUT
OPTIONAL
DTMF ENCODER/
DECODER
F1/F2
LOCATED ON
ANALOG PAGE
+
-
+
-
+
-
MONITOR
PTT
SEE DOCUMENT 7503-INTFCABLE
FOR WIRE COLOR DESIGNATIONS
OPTIONAL
SERIAL INTERFACE
F1
PTT
F2
MONITOR
COR
SPARE
RXD
TXD
RX IN
TX OUT
RELAYS
TTC-1 ONLY
470K
R1
1M
R2
PTA-16
2 Wire ihs7503e1_pta16_2w
CJS
2005-01-17 GPC
2010-07-07
E1
1 of 2 7503
IDIAN ELECTRONICS, INC.
DATE:
DESIGN:
DWN BY:
REV:
APPR SCHE ATIC
COPYRIGHT © 2009
REV
SHEET PROJECT NU BER
DOCU ENT NA E
100KR316
F14 LED
D31
F13 LED
D30
100K
R315
F11 LED
D2
F12 LED
D29
100KR313
100KR314
2 1
A6
D32:1
3 1
A6
D32:2
F3 LED
D14
F4 LED
D15
F5 LED
D16
F6 LED
D17
F7 LED
D1
F LED
D19
F9 LED
D20
F10 LED
D21
HOOK LED
D4
TRANSMIT LED
D6
RING LED
D7
SYNC/TONE LED
D10
MONITOR/
CARRIER LED
D9
F1 LED
D11
F2 LED
D13
DTMF LED
D1
A4
D2:1
A4
D5:1
POWER LED
D3
A4
D :1
A4
D12:1
WIRE
)
))
)
11
22
33
JP1
WIRE
)
))
)
11
22
33
JP
11
22
33
JP14
)
) )
)
11 22 33
JP20
11 22 33
JP15
11 22 33
JP9
11 22 33
JP4
11
22
33
JP13
1
2
3
4
5
6
7
9
10
11
12
BINARY 01
BINARY 02
BINARY 04
BINARY 0
GND POWER
GND POWER
* = NOT INSTALLED
62K
R257
.47u
C199
10K
R349
.47u
C197
11
22
JP44
11
22
JP43
11
22
JP42
11
22
JP41
0R
R320
0R
R319
0R
R31
0R
R317
+5V
SECONDARY_RX_LINE_EN_DE
VOICE_STORE
100K
R32
BSS
Q36
100K
R337
BSS
Q3
.1u
C193
-
+
2
31
411
U19:1
LM324
+12V
-
+
6
57
U19:2
LM324 1K
RP1
TP24
PWM_2
TP13
-
+
13
12
14 U19:4
LM324
-
+
9
10
U19:3
LM324
22R
R327
100K
R330
BSS
Q37
330R
R329
TP25
PAD2
10K
R23
10K
R22
10K
R21
10K
R20 100K
R34
100K
R347
*
R33
100K
R331
+5V
10K
R333 .47u
C19
*
R336
100K
R335
*
R334
+5V
*
R332
BSS
Q41 100K
R339
4.7K
R345
4.7K
R344
4.7K
R342
4.7K
R341
4.7K
R340
4.7K
R321
4.7K
R322
4.7K
R324
4.7K
R325
.012µ
C190
.0047µ
C1 6
.0047µ
C192
.0033µ
C196
.0033µ
C1 9
100
R343
.033µ
C194
100
R323
.033µ
C1 7
560R
R326
10u
C154
10u
C160
ADC INPUT
FUTURE USE
PAD10
FUTURE USE
PAD4
FUTURE USE
PAD5
FUTURE USE
PAD6
FUTURE USE
PAD
ADC INPUT
FUTURE USE
PAD9
.015µ
C1 5
.033µ
C1
.015µ
C191
.033µ
C195
2.2u
C29
2R
R356
10u
C14
.012µ
C201
*
R360
MSK_ENCODER
.1u
C
SD1D36
SD1D35
SD1D37
SD1D3
SD1D39
SD1D40
SD1D41
SD1D42
560R
R346