Betaflight, INAV GPS modules - get more satellites and faster & short GPS modules overview

GPS modules are susceptible to active receiver and video transmitter. With those interferences it could take a long time to get just a GPS fix (4 satellites) and even longer for more satellites .

more satellites:

1.) just power the GPS module and everything else is off (rx,vtx,fc) - my prefered method
2.) turn off telemetry
3.) move the GPS module away from receivers, transmitters and antennas

To power only the GPS module I build an adapter cable with a small 5V out buck (step down) converter. This converter can handle 2-6S (7-26V). On the IN side I soldered a xt30 and xt60 male plug and on the OUT side SH1 connectors for different GPS modules.

- 5v buck converter 7-26v
- XT30 or XT60 male plug
- SH1 connector set
- heat shrink

With this adapter a GPS module gets a (hot start) fix in seconds. For more satellites (gt. 15) power the GPS module for a few minutes.

More infos:

Cold, warm, hot start (Time to first fix): https://en.wikipedia.org/wiki/Time_to_first_fix
GPS signals: https://en.wikipedia.org/wiki/GPS_signals
Electromagnetic interference: https://en.wikipedia.org/wiki/Electromagnetic_interference#Susceptibilities_of_different_radio_technologies

EMAX Tinyhawk Freestyle - adding a GPS module - schematics, Betaflight setup, speed test, rescue mode: https://youtu.be/Gm4bFI2DInw
Playlist EMAX Tinyhawk, II, 2, Race, S & Freestyle: https://www.youtube.com/playlist?list=PLTY4osYDsm1o9ZOcYty4Jsb51QUJ-asNo

Using a GPS on Betaflight: Setup, and looking at Rescue mode (CurryKitten): https://www.youtube.com/watch?v=n89zKarWohs
Betaflight GPS Rescue Mode | COMPLETE HOW TO (Joshua Bardwell): https://www.youtube.com/watch?v=B_Yl0wqRf68
Adding GPS for Drone Speed Testing (Albert Kim): https://www.youtube.com/watch?v=JBD-YnpqPec
Music:

Jean-Michel Jarre https://en.wikipedia.org/wiki/Jean-Michel_Jarre
Mike Post https://en.wikipedia.org/wiki/Mike_Post (The Rockford Files)

#FPV_GPS #Betaflight_GPS #EMAX_Tinyhawk

(reupload, 12/2019)

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