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--- ei5iybpastebin3 [2022/04/12 21:32] – [For the development and testing] ei5iyb
+++ ei5iybpastebin3 [2022/04/12 21:49] – ei5iyb
@@ Line 1: / Line 1: @@
 ====== How to connect external GPS module to Yaesu FTM-300 ======
 ====== List of parts ======
@@ Line 21: / Line 20: @@
     {{:aten-uc232a-0672792000027.jpg?400|}}
   * u-blox u-center v22.02 - [[https://content.u-blox.com/sites/default/files/2022-04/u-center-v22.02_0.zip|download link]]
+  * Yaesu FTM-300 GPS connector pinout
+    {{:ftm-300_gps.png?400|}}
+=== Development board ===
+Pictures of the development board used to setup GPS module
+{{:dev_board.jpg?400|}}
+{{:dev_board0.jpg?400|}}
+===== Method =====
+==== TL;DR ====
+Yaesu FTM-300 requires higher logic levels than BN-220 can provide. MAX3232 is used to translate lower TTL logic levels to higher RS232 logic levels - [[https://www.sparkfun.com/tutorials/215|Quick tutorial here.]] GPS module will require to be set to GPS constellation only in u-center. Radio needs to be set to external GPS device. Transmit from the radio Data Tx to GPS receive Data Rx does not need to be connected.