Gps antenna und rfd900 antenna nearby - beware!

i the past i was testing reach with correction service over internet.

now i have setup my reach successfully with my rfd900 (868) like here:

Today I noticed that all gps bars simultaneously moved around 10 dbm up and down like on picture.

The cause I found on my new 4dbi antenna which was mounted 20 cm from the gps antenna.

After I had removed the radio antenna 1 meter from the gps antenna was everything again in order.

my rfd is running with 27 dbm and 30 % duty cycle…

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