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TN505 MT5-SR-00-01 Subrack
The MT5-SR-00-01 subrack is designed to hold and interconnect the MT-4E/Z and MT-5 series of receiver,
transmitter and control modules on one universal motherboard. The motherboard makes extensive use of cage
jacks to interconnect the A and B systems supporting a number of fi eld confi gurations. Additional auxiliary control
connectors provide easy access to virtually all control and audio lines, simplifying many standard base / repeater
confi gurations. Modules may be inserted in the subrack in many various confi gurations as shown in Figure 1. The
Control Module can be an audio, base, or repeater controller, as well as UIC-5 or paging modulator. The optional
Utility Module is connected to the left side of the rack (this replaces the old System Regulator functionality). Up
to two optional antenna relays can be connected on the right side of the subrack. The subrack has room for two
transmitter and receiver pairs. The left side connectors are reserved for transmitter and receiver A (C in second
subrack) respectively, while the right side connectors are reserved for transmitter and receiver B (D in second
subrack). Although any transmitter and receiver can be placed in either of the respective slots, convention usually
follows that the lower frequency radios will go in slots A and the higher in slots B to D.
Figure 1: Standard Subrack
A quadruple system is shown in Figure 2 with A and B pairs in the fi rst rack, and C and D pairs in the second rack.
This system requires a multiple link controller.
Figure 2: Dual Subracks for Multiple Link Confi guration
TECHNICAL NOTE:
TN505, REV 3-0-0, © Jul 2024
CANADA/US
+1 250 382 8268
UTILITY
CONTROL
TRANSMITTER
RECEIVER
MODULE
MODULE
A
A
UTILITY
BLANK
TRANSMITTER
RECEIVER
MODULE
PANEL
A
A
UTILITY
BLANK
TRANSMITTER
RECEIVER
MODULE
PANEL
C
C
| TOLL FREE
+1 800 664 4066
TECHNICAL NOTES
MT-5 Radio Systems
TRANSMITTER
RECEIVER
ANTENNA
ANTENNA
RELAY
B
B
A
TRANSMITTER
RECEIVER
ANTENNA
ANTENNA
RELAY
B
B
A
TRANSMITTER
RECEIVER
ANTENNA
ANTENNA
RELAY
D
D
A
RELAY
B
RELAY
B
RELAY
B
ZETRON.COM
LMRSALES@ZETRON.COM
Page 1 of 16
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Summary of Contents for ZETRON TN505 MT5-SR-00-01
- Page 1 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack The MT5-SR-00-01 subrack is designed to hold and interconnect the MT-4E/Z and MT-5 series of receiver, transmitter and control modules on one universal motherboard. The motherboard makes extensive use of cage jacks to interconnect the A and B systems supporting a number of fi eld confi gurations. Additional auxiliary control connectors provide easy access to virtually all control and audio lines, simplifying many standard base / repeater confi...
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Page 2: Specifications
TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack If a VHF or UHF power amplifi er is installed, only one transmitter and receiver pair can be installed since the power amplifi er takes up two slots, as shown in Figure 3. - Page 3 DB25 connectors are expanded to include connectivity Depending on the vintage of subrack, DB25 to Telex, Zetron and P25CC devices. An extra DB25 connectors are included for ease of interconnection to connector is added for B side device interconnect.
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Page 4: Power Input
TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack Power Input The main power input connector is located on the rear subrack cover and connects to terminal strip J10 on the motherboard. Power then passes through input protection circuitry and a +9.5 Vdc regulator . When the input voltage is within the subrack operating range of +10 to +17 Vdc (+13.8 Vdc nominal), the voltage is applied to... -
Page 5: Auxiliary Board
TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack Auxiliary Board The MT-5 subrack contains a user interface board called the auxiliary board, which is mounted on the back of the subrack. The auxiliary board contains nine DIP switches, which allow users to select TX/ RX channels/banks and control antenna relay signals Three DB25 connectors and fi... - Page 6 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack DB25 Connector to CI-RC-4M-G2 Connector J9 (RC4M) is a male DB25 connector which can be used for connecting audio, channel select and control signal lines to a CI-RC-4M-G2 multiple link controller. When connected to a CI-RC-4M-G2, a standard straight-through female-to-male DB25 cable can be used.
- Page 7 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack Antenna Relay Activation and Receiver Muting SW1 (MRA) and SW2 (MRB) are DIP switches used to activate optional antenna relays and RX MUTE lines from the Transmitter PTT IN and PTT OUT signal lines. The mute switch connects the Transmitter PTT OUT signal line to the RX MUTE.
- Page 8 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack Channel and Bank Select MT-4E radio modules are capable of 16 channel operation in 2 banks (32 channels total). The 16 channels are controlled via four CSEL signal lines connected to each receiver and transmitter module. The CSEL signal lines are set as either a 0 (0 Vdc) or a 1 (5 Vdc).
- Page 9 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack Methods of Selection There are 3 diff erent ways to change the channel and bank of a transmitter / receiver module: The user can set the DIP switch (one DIP switch for each Tx / Rx module) on the rear panel for each Channel Select signal line and Bank A/B select line.
- Page 10 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack The descriptions of SW3 (TXA), SW4 (RXA), SW6 (TXB), and SW7 (RXB) are shown below: SW3-1 TX A DIP switch 0 = Disable; 1 = Enable SW6-1 TX B DIP switch 0 = Disable; 1 = Enable...
- Page 11 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack Connecting TX and RX in Parallel for Channel Select and Bank Select The Transmitter and Receiver Channel Select lines can be connected together to allow both the Tx and Rx modules to change channels at the same time, through a single selection, either from a rotary select switch (for Channel Selection) or toggle switch (for Bank Selection) or from external control (such as a Telex DSP-223 or IP- 224) through the J2 auxiliary panel terminal blocks or J7 and J8, the A Side and B Side Device DB25 connectors.
- Page 12 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack Auxiliary Board Terminal Blocks The Terminal Blocks are fi ve16 pin headers that mate with 16 position plug-in screw connectors. The plug-in screw connectors use a clamping action to secure stranded or solid conductor wires from 22 AWG to 16 AWG and have locking screws to ensure the connector does not loosen due to vibration.
- Page 13 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack The GPIO connector names are described below, by Control Card. Name Pin # AC-3E CI-BC-4E Site Manager UIC-5 GPIO 1 J3-1 AUX 1 AUDIO I/P 1 AUX 1 AUDIO I/P 1 GPDI4 - Monitoring...
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Page 14: Guide Rails
TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack Guide Rails Modules are inserted along guide rails inside the subrack. See Figure 12 for the guide rail positions. These guide rails are referenced to numbers on the front of and inside the subrack. A guide strip at the top of the subrack will help to place the guide rails in the proper position by following the numbers on the guide strip. - Page 15 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack When the AMP-4 Power Amplifi ers are installed in the subrack, guide rails are installed at positions 18/19 (open) and 41/42 (close) and/or at positions 46/47 (open) and 69/70 (close), depending on if the power amplifi ers are to be installed in slot “A”...
- Page 16 TECHNICAL NOTES MT-5 Radio Systems TN505 MT5-SR-00-01 Subrack This Page Intentionally Left Blank TECHNICAL NOTE: ZETRON.COM TN505, REV 3-0-0, © Jul 2024 LMRSALES@ZETRON.COM CANADA/US | TOLL FREE +1 250 382 8268 +1 800 664 4066 Page 16 of 16...
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