Dual-Pol Upgrade Photos

The radar tower shadow from the top of the tower.
The "RF Palette" installed on one of the counterweights behind the radar. This device splits the radio wave energy sent from the transmitter into two channels and polarizes the waves before sending it to the feed horn.
A view of the backside of the radar dish, showing the new waveguide that was installed to direct the second channel of radio wave energy to the feed horn.
A close up from the front of the dish of the two waveguides meeting up with the radar's new feed horn, which emits and receives the reflected radio wave energy from the dish.
A wide angle view of the previous photo of the front of the radar dish with the new waveguides and feed horn.
A unit mounted to the other counterweight processes the received dual-pol signal.
Wide angle view of the back of the radar, showing the RF-Palette on the left counterweight and the processor on the right counterweight.

Over the last week, the National Weather Service radar in Johnston has undergone a major upgrade to dual-polarization. This upgrade will allow the radar to better estimate the type and amount of precipitation in storm systems, determine whether echoes are precipitation or ground clutter, and at times confirm a tornado in progress. Click here for more information on dual-pol. Here are some photos of the new hardware installed on the radar. Click each image to view a larger version and caption.

Radar Shadow RF Palette Waveguide Feed Horn
Feed Horn Wide View Processor Dish Backside  

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