tait TBCA03-10 Antenna Relay Instruction Manual
- June 6, 2024
- tait
Table of Contents
TB9400 Antenna Relay (TBCA03-10)
TB7300 Antenna Relay (TBDA03-10)
Installation instructions
For simplex applications, the Tait TB9400 and TB7300 base stations can
be set up with an antenna relay (also known as a coaxial relay or a transmit
relay). This enables the receiver and transmitter to share the same antenna.
Before the transmitter keys up, the base station activates the relay,
disconnecting the receiver and connecting the transmitter to the antenna. It
then powers the transmitter up. After it powers the transmitter down, it opens
the relay again, so that the base station is ready to receive.
If the transmit and receive frequencies are equal, the base station
automatically increases the transmitter frequency by 25kHz when the base
station is not transmitting, to prevent receiver blocking. When the base
station is transmitting, the receiver is disabled. The TBCA03-10 Coaxial Relay
Assembly kit contains all the equipment for a TB9400 base station antenna
relay system. The TBDA03-10 Coaxial Relay Assembly kit contains all the
equipment for a TB7300 base station antenna relay system, including the wiring
for the relay coil. The antenna relay will handle 66560MHz. This document
shows how to install the kit.
Notice Do not manually operate the relay while the base station is
transmitting. The PA is protected against a mismatched load, but not against
removing the load while transmitting.
The TB9400 must have a PMU with an auxiliary 13.8VDC output to supply power to
the relay.
Notice Ensure the receiver coax cable is connected to the correct relay
port. See photos on page 2 for guidance.
Notice When on a TB7300 the relay is powered from the same DC supply that
powers the base station. The relay requires an additional 200mA.
The antenna relay driver output (`Coax relay out’ in the WUI) is an open-drain
FET and the output is pulled to the ground whenever the transmitter is keyed.
Internally, within the reciter, there is a Zener diode between the source and
drain of the antenna relay output FET to provide reverse voltage protection
(refer to “Simplified Antenna Relay Circuit” on page 7).
Contents of the TB9400 Antenna Relay Kit
- Bracket
- Antenna relay assembly
- Cabling
- Screw x1
- Cable ties
- Coaxial relay interface (T01-01138-AAAA)
- Spade connectors x2
Contents of the TB7300 Antenna Relay Kit
- Bracket
- Antenna relay assembly
- Cabling
- Screw x2
- Coaxial relay interface (T01-01138-AAAA)
Installation
Mount the antenna relay assembly on the back of the Power Amplifier (PA). Use the PA cover screw adjacent to the N-type connector to secure the bracket to the PA. Screw the antenna relay N-type transmit connector to the PA N-type antenna connector using the N male-to male adapter. The photos show a 100W PA, but the instructions apply equally to a base station with a 50W PA (see photos on page 4), and a TB7300 (see photos on page 4). Follow these steps.
- At the rear of the PA, remove the cover screw next to the N-type connector.
- Fit the male-to-male barrel connector onto the PA N-type connector. Secure the antenna relay bracket by fitting the supplied M3 x 8mm screw (x2 for the TB7300) through the bracket to the PA chassis.
- Fit the supplied cable (N-type to BNC) from the antenna relay to the receiver RF input.
- Connect the antenna relay coil to the reciter DB25 with the supplied module, T0101138, as follows. Refer to the photos below.
If the system requires the use of other digital inputs or outputs, connect them to the appropriate digital pins.
Note: The red wire is fitted with a non-replaceable, inline 1A fuse to protect relay wiring and circuitry
Attaching the Simplex Module
The Simplex Relay Module (T01-01138-AAAA) should be connected as follows:
Attaching the E &M Module
The antenna relay can also be used with the E&M Interface Module
(T01-01137-AAAA):
Enabling and Configuring Antenna Relay Operation
Using the base station WUI, enable antenna relay operation.
- Open the base station WUI.
- Select Configure > Base Station > Programmable I/O.
- Select the antenna relay control check box.
- Save your changes.
Simplified Antenna Relay Circuit
Simplex Relay Adapter Module Schematic
TB9400/TB7300 Antenna Relay Installation Instructions
© Tait International Limited April 2021