[Al Skierkiewicz]

This is from the IFI FAQ for the radios...


If pressing Reset on the Robot Controller does not work, then make sure the “Team Number" on both units is set correctly (by tethering on 2004 or newer systems). Then try new radio cables and then new radio modems.

Last edited by IFI Tech Support on Wed Jan 24, 2007 6:02 am; edited 1 time in total
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Joined: 07 Dec 2004
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PostPosted: Sun Feb 19, 2006 10:08 pm Post subject: Reply with quote
Similar to one post already on this board we have been having problems with our radio modems. At first we thought it was our transmitter, as it would stay in Standby mode, and the No Data/Radio light would be a constant red. We were able to get a spare transmitter and it now seems to behave correctly. Now our receiver only stays in Standby, with a blinking No Data/Radio light on the OI. We also were able to get our hands on a spare receiver as well, but it behaves the same.

We have followed all the steps in the manual and those listed here by tethering the robot, pressing the reset buttons, etc... We are going to try changing the channel from 40 to something else using the instructions but I don't have much faith that will work.


Both the RC and OI Radio Modems transmit and receive. A solid Red LED for the No Data/Radio on the RC or OI indicates the unit can not communicate with the radio modem. The problem is a loose DB9 cable connection, a bad DB9 cable, a bad radio modem, and in very rare cases a bad RC or OI.

A Red blinking LED for the No Data/Radio on the OI indicates the unit is in search mode. The solid Amber/Yellow LED for the No Data/Radio on the RC indicates the unit is in search mode. The search mode is what you want but even under this situation the units still will not link if the team number inside the RC is not the same as the team number set on the OI. Both radio modems should be flashing Standby while tethered. In Search Mode, the OI radio modem should be flashing Transmit with a Standby flash about every 1-2 seconds and the RC radio modem should be a solid Standby.

Interference on channel 40 usually only causes an erratic radio link, but you should try another practice channel as you have suggested.

If the above does not help, please call 903-453-0802 between 8:00 – 5:00 CST with the system setup in front of you and we can help you troubleshoot it over the phone.
IFI people are really nice.