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Valid network keys are generated and allocated by Garmin Canada Inc., to ensure network integrity as well as interoperability, in the case of managed networks. If an invalid network key is configured on a device, no changes will be applied to the network key already configured in the device for that number. Usually, this is the default public key, which makes it appear that devices with different invalid network keys are able to communicate.
Ensure that the devices are within range of each other. Next verify that the Channel Periods are correct. If the master’s message rate is lower than that of the slave, Rx Fails are to be expected. The most reliable performance is experienced when the Channel Periods of the master and slave match.
The Channel Search Timeout (length of time that the slave will search for transmissions from the master before timing out) can be set by the user. See section 22.214.171.124 of the ANT Message Protocol and Usage document.
Ensure that the devices are within range of each other (varies by device and device settings), that both are on/awake, and that neither device is in a location that is known to attenuate radio signals significantly (i.e. in a metal enclosure or surrounded by water).
Next check the channel configuration of each device. Network Key, RF Frequency, Channel ID, and Channel Period should match and the Channel Types should be complementary (i.e. one master and one slave). Also ensure that you configure the channel in the order defined the ANT Message Protocol and Usage document, so that you don't accidentally set any values back to their defaults (i.e. assign channel before configuring it).
If using exclusion/inclusion lists, make sure that they are not causing the slave to ignore the master.
If using a wild card search for pairing, make sure that the pairing bit configuration matches in both devices (i.e., if the pairing bit is set on the master, it should also be set on the slave).
ANTware II and SimulANT+ are useful for ensuring that devices are capable of transmitting/receiving messages. See Chapter 5 of the ANT Message Protocol and Usage document for a full explanation of ANT Channels.
Usually the "Ant Initialization failed" means that the connection to ANT failed. Check that the ANT USB stick is recognized by your computer. For more information on this and the USB driver required, please refer to the USB Drivers section of the FAQ.
There are a couple steps which may be under taken to determine why an ANT USB stick is not working with your phone: