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MX920 Base Station & Repeater
4. Options
Due to ongoing development please refer to
4.1 Simplex Changeover Relay
4.1.1 Description
For simplex applications an internally mounted coaxial changeover relay can be
provided. This mounts on the rear panel and the common port protrudes through the
chassis providing the simplex antenna connection. The relay normally closed port is
internally connected to the MX920 receiver and the normally open port is connected
to the transmitter via the standard RX connector hole in the chassis (the RX connector
is removed) using a special cable assembly. The relay also has control connections to
the micro controller PCB.
Once the relay option is fitted the channels are programmed as simplex channels
through the Channel Edit screen of the built-in radio configuration menu system.
When the simplex mode is selected, a small time delay is added to the transmitter RF
to allow the relay to changeover and set the simplex operating mode respectively.
4.1.2 Installation
Components Required:
1. Coaxial Relay Assy complete with TX and RX cable connected.
2. 2 of M3 Metric 8mm pozi-drive screws.
Test Equipment Required:
1. Communications Test Set
2. MX920 Radio Communications Cable
Method:
1. Remove the cover to the MX920 radio.
2. Remove the existing Receiver coaxial feeder cable assy.
3. Install the relay assy into the MX920 with the relay coil on the opposite side of
the relay to the DC power connector. Secure with the 2 of 3x8mm screws
provided.
4. Route the Rx coaxial cable to the Rx unit input RF connector.
5. Connect RG58 cable assy to the PA module RF output.
MX920 Controller Setup:
1. The MX920 RF channels that are required to be simplex should be programmed
as 'SIMPLEX' within the channel edit screen of the radio configuration menu
system and then downloaded to the MX920.
www.spectraeng.com.au
for the latest revision of options .
Technical Manual
Qty-1
Qty-2
2003 Revision
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