I have a Lab Radar. A big pain in the butt to get aligned. With the external am trigger it was better but for practical use in my opinion, might years difference in the two.
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Caldwell Velociradar ..anyone have any hand-on experience?
- Thread starter manabeknives
- Start date
I did a little research on the VelociRadar, which is made by AOB Products Company. The FCC ID is:
Interesting that they seemed to leave some performance at the table. Their EIRP is 6 dBm, but they are allowed (in the US) 20 dBm.
Their antenna is wider than it is tall, which means it is narrow in the horizontal and wide in elevation. This means they will suffer from multi-path fade, since the beam is partially illuminating the ground. Multi-path means the signal is attenuated or cancelled at multiple distances. The radar operates in the 24 GHz ISM band and use only 100 MHz of bandwidth. This means they can only resolve range down to 1.5 meters. It's not terrible, but adjacent range cells are limited to 1.5m separation. If they actually do a chirp, then they could do ballistic calculations.
However, nowhere in the test report is a photo of a chirp, so it is unclear if they chirp at all. The test report only shows three frequencies. When I had to do compliance testing, we were forced to use expensive equipment to capture the chirp wave forms - to ensure there were no spurious emissions occurring during the chirp.
As an example: Here's some chirp wave forms at 77GHz that I took a picture of. The chirp is on the top right in the screen. The frequency is linearly swept (increasing in frequency) multiple times. That piece of test equipment, a R&S FSW-85, cost more than the purchase price of my home.
2AF3W-1134904
The FCC reports and internal pictures can be found at: https://fccid.io/2AF3W-1134904/Interesting that they seemed to leave some performance at the table. Their EIRP is 6 dBm, but they are allowed (in the US) 20 dBm.
Their antenna is wider than it is tall, which means it is narrow in the horizontal and wide in elevation. This means they will suffer from multi-path fade, since the beam is partially illuminating the ground. Multi-path means the signal is attenuated or cancelled at multiple distances. The radar operates in the 24 GHz ISM band and use only 100 MHz of bandwidth. This means they can only resolve range down to 1.5 meters. It's not terrible, but adjacent range cells are limited to 1.5m separation. If they actually do a chirp, then they could do ballistic calculations.
However, nowhere in the test report is a photo of a chirp, so it is unclear if they chirp at all. The test report only shows three frequencies. When I had to do compliance testing, we were forced to use expensive equipment to capture the chirp wave forms - to ensure there were no spurious emissions occurring during the chirp.
As an example: Here's some chirp wave forms at 77GHz that I took a picture of. The chirp is on the top right in the screen. The frequency is linearly swept (increasing in frequency) multiple times. That piece of test equipment, a R&S FSW-85, cost more than the purchase price of my home.
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