Near Intersection of I-35 & I-90 Southern Mn. | You seem to understand the situation.
The fact that you are getting a speed reading is very encouraging. This indicates that your wiring is correct.
The fact that the indicated speed is incorrect is to be expected. You will need to adjust the speed cal number that is being used within your KPM 2. This is necessary since the angle of the radar gun to the ground can vary from tractor to tractor and with field conditions. The radar gun should be mounted either pointing forward or backward without any obstructions if possible.
It is important that the speed indication shown on the KPM 2 be accurate as it will affect the area that the KPM 2 believes you are covering. This in turn is used to indicate the population that you are planting.
This adjustment can be done various ways. The quick and dirty method would be to just try various speed cal numbers until you find one where the speed indicated on the KPM 2 agrees with the tractor speedometer. The problem with this method is that the tractor speedometer may not have been calibrated itself and thus not accurate.
A more precise method is to measure out a certain distance as indicated in your book. The procedure would be the same whether the radar is on the planter or the tractor. This should get you quite close.
This should give you a speed cal number that will be acceptable for use. After you have planted a few fields you can compare the acres shown on the KPM 2 with what you know the field size to be. The acres shown on the KPM 2 may be slightly larger than the known field acres due to point rows, overlap etc. but should be reasonably close to the known field acres. If the KPM 2 acres are consistently different (high or low), you might want to change your speed cal slightly. Write down the speed cal numbers you are using for future reference and fine tuning if necessary.
Edited by tedbear 5/5/2025 08:09
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Adding radar to KPM 2
