Saved all three to network drive..took five minutes. I guess that's a little fast, IDK. Wow. Not Doppler (meaning it doesn't pulse?) and not digital, which means it be old skool. And I have a question (I'll probably scan through the PDF's for the answer later), how does it detect storms if it uses a Polaroid cam and not digital or Doppler? Confusing..
All radars send pulses. FPS-77 wasn't Doppler meaning that it couldn't detect the shift in frequency of the returned echo. A moving target causes a shift in frequency indicating the direction and speed of the target movement.
All echos were displayed on CRTs. A PPI scan to show distance and azimuth bearing. An RHI scope to indicate height of storm tops, hail shafts etc. An A/R scope to measure the echo intensity & more accurately measure distance. The antenna could be made to sweep in azimuth or elevation, or the antenna could by pointed to a cell for height or distance analysis.
There was no means to electronically record the echos. We recorded the CRT image using a Polaroid camera.
The PPI scope used a long persistent phosphor that indicated the echos in black, not light green. The PPI echos would remain on the CRT up to 1 hour. The scope was back lighted so we could see the black storm images on the scope. The images were erased with a heating filament inside the CRT.