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# WR2RF operational timings
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## Introduction
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Throughout this page we will expand on the operating characteristics of the WR2RF-VME and detail various calibration sequences that may have to be performed, either once at start-up or periodically, perhaps after every cycle.
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## AD9910, RFNCO reset receipt and stable RF
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If the ad9910 is not outputting a stable signal when the nco_reset signal is asserted, the RF signal is observed from the front panel as shown below. It takes somewhere between 400-500 ns to achieve a stable RF signal.
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![ad9910_cold_start](uploads/75510ccb4d3e1e8f92232b87e2bed4e4/ad9910_cold_start.png)
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If the ad9910 **is** outputting a stable signal, when the nco_reset signal is asserted, the RF signal is observed from the front panel as shown below. It takes somewhere around 200 ns to achieve a stable RF signal. I have assumed that a pre-injection is available 300 ms before the nco_reset signal will be asserted.
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![ad9910_warm_start](uploads/cf1f9f772a1414d88ce73877ad38e87f/ad9910_warm_start.png) |
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