Motorola Gr300 Zr310 Community Repeater 6880902z68 C Manual

							 
Section 2 
Installation
 
Fan Installation 
Perform the following steps to reinstall the fan assembly in the repeater housing. Due to a limited amount of space in the 
back of the repeater housing, you must connect the power cable before installing the fan. To free both hands for easier 
installation of the power cable, you may want to rest the fan assembly on top of the repeater housing. 
1. Connect the fan assembly power cable between the bottom connector of the power supply and the fan assembly 
connector that extends out the rear (refer to Interconnect Cabling Diagram) 
2. Side the yellow lead of the fan assembly power cable containing the thermistor into the thermistor clip (Figure 2-4). 
 
Figure 2-4. Thermistor Clip 
3. Using a Torx screwdriver, secure the thermistor clip to the mounting hole located on the transmit radio heat sink with a M5x0.8x8 taptite 
screw (Figure 2-5). 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
March, 1993  6880902Z68-O  Section 2-3 
						

							 
Section 2 
Installation 
 
 
 Figure 2-5. Transmit Radio, Rear View 
Locate the cable tie wrap supplied with the GR300.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
March, 1993  6880902Z68-O  Section 2-4 
						

							 
Section 2 
Installation 
 
 
Figure 2-6. 
 
 
 
 
Section 2-5  6880902Z68-O  March, 1993 
						

							 
Section 2 
Installation 
 
GR300 Housing Kit HLN8391_ 
Item Part Number Description Qty. 
1 None  Fan Assembly  1 
2 1580675B01  Cover  1 
3  0310943M59  Screw, Taptite, M3.5x0.6x6  4 
4  0310907A91  Screw, Machine, M3.5x0.6x8  4 
5 0780676B01  Base Tray  1 
6 6480495C01  Front Plate  1 
7  0310907B08  Screw, Machine, M5x0.8x8  8 
8 03136993  Screw, Machine, 6-32x3/8  4 
  
Table 2-1. Receive Radio Jumper Settings (GM300 16 Channel Models) 
GM300 Jumper R*I*C*K ZR310 ZR320 ZR330 i50R 
JU551 B A B B B 
JU651 X X X X X 
JU701 X X X X X 
Table 2-1. Transmit Radio Jumper Settings (GM300 16 Channel Models) 
GM300 Jumper R*I*C*K ZR310 ZR320 ZR330 i50R 
JU551 X X X X X 
JU651 A A A A A 
JU701 A  B A A X 
  
4. Bundle the cables with the cable tie wrap. 
5. Dress the cables so they dont extend out the back of the GR300. 
6. Position the fan assembly (1) in the repeater housing (2). 
7. Align the set of mounting screw holes on the rear of the fan assembly with the corresponding mounting holes on the 
repeater housing. 
8. Using a T15 Torx screwdriver and four M3.5x0.6x6 taptite screw (3), secure the fan assembly to the 
repeater housing. 
9. Verify that all screws are tight and all cables have been connected properly. Refer to the 
Interconnect Cabling Diagram located in the back of the manual. 
 
 
 
 
March, 1993  6880902Z68-O  Section 2-6 
						

							 
Section 2 
Installation 
 
NOTE 
You will not install the front plate of the repeater 
housing until you have completed all tests and 
adjustments under the heading Tests and Adjustments.
Initial Turn-On 
The following steps describe the process of turning on the ZR310 for the first time. 
1. Remove protective covers from both radios LED displays 
2. Connect the power cable into a 115/230Vac power source 
NOTE 
The 115/230 switch on the bottom of the power 
supply must be in the position corresponding to the 
power source. You should have done this during the 
GR300 basic assembly. 
3. Turn on the power supply. The unit is on when the red portion of the switch is visible. 
4. Turn on both radios by rotating the volume controls clockwise. 
5. Verify that the ZR310 green Power LED is illuminated, the display windows on both radios are illuminated and the fan 
is operating. 
Diagnostic Commands - Refer to Programming Section, Diagnostic Commands.  
Programming - To customize the ZR310 to your particular application, refer to the Programming section. 
 
 
 
 
 
 
 
 
 
 
March, 1993  6880902Z68-O  Section 2-7 
						

							 
Section 3 
Operation 
Overview 
Theis section describes the basic operation of the ZR310 Community Repeater Panel. Included is a list of all TPL and DPL tone codes with 
their decoded user numbers. Refer to the programming section of this manual to customize your community repeater. 
Basic Operation 
Installing the ZR310 in the GR300 Repeater Station converts the GR300 Repeater Station into a multi -user community repeater. The ZR310, 
via a microprocessor, performs data management to simultaneously decode and encode TPL and DPL tones. 
TPL Tones and DPL Codes 
The ZR310 monitors the channel for TPL Tones and/or DPL codes. When it detects a tone or code, it implements conversion to a user  
number (Table 6-2). Next, it points to the area in the database that contains information about that particular user. The DPL decode numbers 
in the table are user programmable. 
User Validation 
The ZR310 is always monitoring the receive audio for the presence for a valid user. You can enable or disable any of the 50 TPL tones, and 
any combination of the 20 DPL codes. For information on how to enable or disable a user, refer to the programming section of this manual. 
Enabled Users 
When the ZR310 detects an enabled TPL tone or DPL code, it will check to see if the user is enabled or disabled. A disabled user is ignored 
and is not repeated. 
Co-Channel Protection 
For each user, you can select co-channel protection on/off. If the ZR310 detects an enabled TPL/DPL user when co-channel protection is 
transmitting, it will check to see if a carrier is present on the repeater transmit channel. If the transmit channel is busy (possibly due to paging 
or other activity not present on the repeater receive channel), the ZR310 will protect the channel and wait for it to clear before keying the 
transmit radio. The co-channel protection feature determines whether or not the ZR310 has priority on the channel. 
 
 
 
 
 
 
 
 
 
 
 
March, 1993  6880902Z68-O  Section 3-1 
						

							 
Section 3 
Operation 
Regenerated TPL/DPL/CSQ 
When you key the transmit radio, depending on the programming, the ZR310 will 
• Encode nothing for carrier squelch  
• Regenerate the received TPL ton or DPL code  
Encode a different TPL tone or DPL code (cross-tone encoding)
 
Carrier Repeat
 
The ZR310 can also be configured as a carrier repeater, or sometimes called an open repeater. In this mode, any activity on the receive 
radio causes the transmit radio to key. 
The ZR310 can also provide tone control (TPL/DPL) and open repeater operation simultaneously. In other words, users that have no encode 
(CSQ) repeat just like users that have TPL or DPL encode. This allows a mix of TPL/DPL users with one repeat capability and is ideal when 
upgrading TPL/DPL users to an existing open repeater channel. 
To enable carrier repeat, a user number is identifies as the carrier repeater user. This allows all standard user programmable features for 
open repeat, including enable/disable for the carrier user, TPL or DPL encode encoding, courtesy tone, etc. If the user number is set to 0, 
no carrier repeater is available.
 
Reserved Users 
If a user is reserved, the repeat audio will be squelched an a beep tone sent on the transmit audio when the user tries to use it. A chirp tone 
is sent when the user unkeys to indicate reserve mode. 
When a User Unkeys Radio 
When a user radio unkeys, or the TPL/DPL is no longer detected, the ZR310 will take some actions. The following paragraphs describe 
possibilities of that action. 
Morse Code Station Identification 
When an enabled user unkeys, the ZR310 checks how long it has been since the last time the station ID has been sent. If the time has been 
longer than the Morse ID interval time (initially 15 minutes, user programmable 1-99 minutes), then the ZR310 sends the call sign. Each user 
group has its own call sign and individual ID interval timer. The Morse ID is sent at the selected ID speed of between 4 and 25 wor ds per 
minute. The call is sent at 30% deviation (FCC part 90 rules) so that voice communication still occurs during the voice ID. 
NOTE 
If the Morse ID is not programmed, or the first 
character is programmed as a space, no ID is sent. 
You can program a single system ID for use in co-op 
and private carrier applications. 
 
 
 
 
 
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Section 3 
Operation 
Reserve Mode 
If the user is in the reserve mode when unkeying, a chirp is sent. This chirp gives a positive indication of active reserve mode. 
Courtesy Tone 
The ZR310 will next check to see if the user requires the courtesy beep. If so, then it sends the beep one second after the transmit radio 
unkeys. The beep frequency can be sent from 400 to 2500 Hz (default setting is 1000 Hz). If the user is a 400 Hz tone just after the GR300 
unkeys, potential failure has been detected. 
Barge In (Privacy Mode) 
Finally, the ZR310 continues checking for TPL/DPL. If the last user is set for privacy mode, then no other users will be allowed on  th e 
system until the transmit hold time (repeater tail) expires. 
Repeater Hang Time 
The programmable repeater tail or transmit hold timer is adjustable from 0.0 to 25.0 seconds. When the user radio unkeys, the ZR310 
begins monitoring for valid TPL/DPL tones to be received. If a valid user is not detected within a specified timeout period, the IPL decode 
shuts off or the DPL turn off code is sent (if it was previously on). After a 0.2 second delay, the transmit radio PTT is dropped. This method 
removes the second squelch tail heard by the mobiles when the user radio unkeys. 
Encode During Transmit Hold Time 
When a valid user unkeys, the TPL or DPL encode may be left on or turned off during the transmit hold time. This feature is programmable 
for each user. When using a control station phone patch through the repeater, you should turn off the encode during transmit hold. Turning 
off the encode allows the phone patch to distinguish whether the mobile has unkeyed or the repeater has dropped off the channel.  Wh en  
using the repeater for dispatch only, you may leave the encode on during the transmit hold time to keep the mobile decoders open. This 
feature eliminates the decode delay observed in the mobile between transmissions. 
Stuck Mic Timeout Timer 
While the Gm300 mobile radios are conversing through the repeater, a timeout is running. If a mobile does not unkey within the time period, 
double beeps are sent, and the transmit radio PTT is dropped. 
Anti-Kerchunker Filter 
The anti-kerchunker filter cancels the transmit hold time (or repeater tail) and drops the transmit radio immediately if a mobile transmission 
is less than the programmed anti-kerchunker time. This discourages customers from clicking (kerchunking) the PTT just to hear the transmit 
radio. 
Accessory PTT Encode 
An Accessor y device such as a tone remote or local microphone may key the transmit radio, and take over control of the repeater. The 
accessor y may need the ZR310 to encode a particular TPL tone or DPL code in order to communicate with a specific user group. The ZR310 
includes a programmable Accessor y PTT encode setting to accomplish this function. Whenever an accessor y keys the transmit radio, the 
ZR310 disables the repeater transmit hold time until 30 seconds of no accessory transmit has expired. 
 
 
 
 
 
 
March, 1993  6880902Z68-O  Section 3-3 
						

							 
Section 3 
Operation 
Repeater Set-up/Knockdown 
The system operator may remotely enable or disable the ZR310 operation. When in knockdown state, the ZR310 
effectively disables the transmit radio. (Refer to Programming section, DTMF Command Descriptions, System 
Commands, Repeater Set-up/Knockdown.) 
  
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
March, 1993  6880902Z68-O  Section 3-4 
						

							 
Section 4 
Theory of Operation 
Overview 
This section provides the experienced technician with a thorough understanding of the ZR310 circuits and their operation. This information 
will aid the technician in troubleshooting the equipment. 
Circuit Description 
Use this detailed circuit description in conjunction with the schematic diagrams in the back of the manual. 
Microprocessor 
To ensure an orderly power up sequence to microprocessor U1. and its peripheral devices, the active low reset signal is not brought up until 
the 12 vdc supply has stabilized. Zener diodes CR5, R22/C28, and U4D accomplish this task. The delayed reset also gives crystal Y1 time to 
stabilize. An additional reset input comes from the long DTMF reset circuit. This circuit is a fail safe device to allow the system operator to 
reset the unit remotely by keying a DTMF digit for longer than 12 seconds. 
Memory is functionally divided into three sections: (1) program memory, (2) operating memory, (3) protected database memory. Program 
memory resides in ERROR U8 and stores the actual operating instructions that make the ZR310 work as a community repeater panel. 
Operating memory is provided by static read/write memory RAM U3 and the internal memory in microprocessor U1. The ZR310 performs 
computations and maintains a data buffer in this area. Database memory contains all the user and system programming values and must be 
retained regardless of how often power is lost. To do this, the ZR310 stores the user and system programming values in EEPROM U5. 
Peripheral timers and counters, U14 and U15 are available to the microprocessor. The counter ICs contain thee timers each which are used 
for tone generation and internal timing functions. 
The microprocessor is able to directly control 8 I/O lines that interface to its Port 1 register on pins 13 through 20. These carry information 
from the various digital control outputs and inputs.
 
Serial Communications 
Asynchronous data transfer is accomplished via a microprocessor U1s internal UART. The UART receives data through pin 11 of the 
microprocessor but first it is buffered to be compatible with the Motorola RIB interface via Q10/Q11/U16A. Data is transferred through pin 
12 of U4 then is buffered with the same RIB interface circuit. The RIB interface baud rate is connected by the baud clock output on pin 6 of 
timer U15. This baud clock output is applied to the microprocessor U1 bit clock input on pin 10. 
TPL/DPL Decoding 
Unquenched discriminator receive audio passes through unity gain stage U18B then gets low pass filtered by U18C and U18A. This removes 
the voice component from the audio. The U18D and the R66/C63 filters make up a zero crossing detector, which applies the resulting digital 
signal to the microprocessor on pin 17. The microprocessor performs the actual decoding for the TPL tones and DPL codes using proprietary 
digital signal processing techniques. 
DTMF Decoding 
The mobile audio from the receive radio discriminator passes through unity gain stage U18B, then low pass filtered by U16C. Finally the 
signal is presented to the DTMF encoder/decoder U10. U12A is used to switch the audio to the DTMF decoder between receiver audio, and a 
DTMF telephone plugged into the programming socket J1. When a telephone (or any low impedance) is plugged into J1, U16B will sense 
the voltage drop across RP7D and switch the audio to the DTMF decoder. 
 
 
 
 
March, 1993  6880902Z68-O  Section  4-1