Roger Beep - IC910 installation notes

This article contains notes on installation of a Roger Beep inside an Icom IC910 transceiver.

This is a proposed solution, I have not performed this modification.

CAVEAT: Any modifications that you make to your transceiver are entirely your own responsibility. Owen Duffy takes no responsibility for the accuracy of this article, or for the outcome of your modifications. Modification of a transceiver may have implications for original warranty.

Installation

Fig 1: Roger Beep module with optional connector and enclosed in heatshrink tube

Fig 1 shows Roger Beep module with optional connector and enclosed in heatshrink tube. Note the hole cut in the shrink wrap to provide access to the level adjustment pot.

Fig 2 shows the module installed in an IC910.

Fig 3: IC910 circuit - MIC jack

Fig 3 shows a candidate for connection of the Roger Beep module near the back of the MIC jack. 

Fig 3: IC910 circuit layout where the MIC jack cable connects to the display board (J6)

The proposed modification is to cut the PTT track near J6 on the display board (see Fig 3), and to connect the RB PTTin and PTTout wires each side of the track cut (PTTin goes to the J6 side of the cut, and PTTout to the L5 side of the cut). The rest of the RB connections can be made to J6 connections to the display board (RB ground to J6 pin 8).

Adjustment procedure

Before finally tucking the module into the transceiver:

1. Set the transceiver up on a dummy load or antenna for transmission testing.
2. Turn the processor off, select USB mode and adjust the MIC gain control as per the IC910 manual.
3. Configure the RB for mode 6, continuous tone, as per Configuration.
4. Press PTT to initiate tone transmission.
5. Adjust the RB level control until there is just sufficient level to cause indication on the ALC LED.
6. Press PTT again until tone transmission ceases.
7. Turn the transceiver off.
8. Configure the RB for your preferred mode of operation, as per Configuration.
9. Test operation.

Changes

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