Differences

This shows you the differences between two versions of the page.

--- radios:tait_tb7100 [2025/04/17 11:37] – 2e0sip
+++ radios:tait_tb7100 [2025/04/21 20:49] (current) – 2e0sip
@@ Line 23: / Line 23: @@
   * **Warning:** If you power up the repeater whilst modifying it //without// completing all the steps, you may find it starts to transmit at 25w, drawing over 4 amps. Make sure you're using a suitable power supply and a dummy load (The radio should reduce the output power if it detects high SWR, but best to avoid risking it)
-==== Conversion - Duplex Repeater ====
+==== Duplex Repeater Conversion ====
 To convert the pager transmitter into a duplex repeater, you will need to transplant in an Rx radio, 3x ribbon cables, a DC power lead, and appropriate coax / connectors / duplexer (optional)
+==== Multitone interface removal +  Simplex improvements ====
-==== Files ====
+If you're planning to use the TB7100 for simplex use (Packet node, analogue gateway, etc) you'll probably want to remove the Multitone Pager Interface to free up some room in the enclosure. Unfortunately it's not quite as simple as just removing it, as without it the UI interface will malfunction. This is because in normal operation it takes 13.8v and 3.3v from the Rx radio, which is absent. As a workaround, the pager interface takes 13.8v from the aux connector on the Tx radio, drops it down to 3.3v, and supplies both these voltages to the Rx connector on the UI board. It's also not possible to monitor the receive audio on the Tx radio, as this is hardwired to the Rx side.
+To fix these issues, we can instead split the signals and voltages coming from the connector on the Tx radio control head connector, and shuffle them around so everything's in the correct place. This will also free up the aux connector on the Tx radio for interfacing with your TNC or other controller.
+**Note:** This solution is slightly half baked. The connections to the system board will be removed, meaning it will only be providing DC distribution and fan control - There will be no I/O exposed on the system connector. If you need more space you could remove the system board entirely, or if you need the I/O you could perform some additional re-mapping internally, but as availability of these particular pager transmitters has dried up, we'll go with a quick solution for now.
+===== Files =====
 {{ :radios:tait_multitone_paging_interface_fitting.pdf |}}
 {{ :radios:tait_multitone_pager_module.pdf |}}