The Doppler are tested one by one.

Jacques VE2EMM is the originator of this Doppler.

An audio generator and an oscilloscope are necessary to make the various tests.

Alex VE2AMT and Jacques VE2EMM.

Jacques makes a first test with the oscilloscope.

All problems must be found.
This homemade device is useful to check if the Doppler reads all the 8 antennas.
A paper is stuck on each Doppler on the test bench.
It is necessary to measure the voltage of each antenna separately.

 Checking the Max 204 in the switcher.

The final test.

We have to test the voltage of all four antennas.
We use a VOM meter on each antenna.
This antenna is not reading.
The voltage is 4.45 volts when an antenna is reading.