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Your Nova evaluation kit comes pre-tuned to match the cables and antenna contained in the kit. However, if you choose to alter cabling, antenna, or even place the included antenna in an environment with metal within a meter of the antenna, you should follow the procedure below to retune your reader/antenna network.
This section is for those customers who wish to learn more about the Nova’s Antenna Tuning algorithm and the output it produces. The information is not necessary to operate the tuning function.
There are two tuning commands available for the SkyeModule Nova, “RunFullTuneQuiet” and “RunFullTuneVerbose”. The two commands both follow the same antenna tuning algorithm, but the “RunFullTuneVerbose” returns the results of the tuning activity.
The Nova has a three element matching network, consisting of three tunable capacitors and three inductors. Measure the quality of the antenna tune by measuring the RF power reflected back into the receiver. This voltage is present on the “OAD” test point for both the I and Q channel, where lower values are better. The capacitance is changed on each device, and the lowest (OAD) values are stored for each frequency.
The value returned from the “RunFullTuneVerbose” gives the following information: