QUESTION

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M20057-1 GNSS Active Antenna Issue with AT1 & AT2 connected to GND with 0 ohm res.
I am using Quectel L-70 GPS module with M20057-1 part. My RF path in tuned to 50 ohm Impedance and working very fine with external antenna. We are unable to receive any data ( like HDOP,PDOP,3D Index etc) with this antenna. I have connected 0 ohm res. to AT1 & AT2 pins and followed same layout guidelines as mentioned in datasheet.
https://drive.google.com/drive/folders/11qm0c86zWnheqJYQzjyg3AhMalWw9MmD?usp=sharing

What could be potential issue with this antenna that am not able to receive any data ?

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1 Answer

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Hello Viral Vasa,

It sounds like your M20057 module is not tuned properly to the GPS frequency. AT2 should start at 1.8nH not a 0 ohm resistor AT1 can stay at 0 ohm and then continue to adjust AT2 until the signal gets better.  There is also a capacitor across pin 4 and pin 6 that can be adjusted up or down a couple of values to see if this improve the TTFF.
If you are still having problems please contact me at techsupport@antenova.com and we can discuss your design further.

Best regards,

Geoff S.

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