rtldavis windspeed problem

[Danny Ciarniello]

I have just set up weex with a Vantage Vue using weewx-rtldavis.  At first everything looked good but then I noticed that the WeatherLink Console that I have was displaying wind speeds but weewx was getting mostly zeros.  From the logs, most of the windspeed readings that the driver is producing are zero.  The occasional non-zero readings are mostly multiples of 1mph.  Why would this be happening and what can be done to fix the issue.

Here's the RtlDavis section of weewx.conf.

[Rtldavis]
   cmd = /etc/weewx/bin/user/rtldavis
   transceiver_frequency = US
   iss_channel = 4
   anemometer_channel = 0
   leaf_soil_channel = 0
   temp_hum_1_channel = 0
   temp_hum_2_channel = 0
   rain_bucket_type = 1
   debug_parse = 0
   debug_rain = 0
   debug_rtld = 2

   save_pct_good_per_transmitter = False
   driver = user.rtldavis

This is with weewx 5.2.  The Vantage Vue is the US metric version.