doc: kenwood howto

doc/kenwood.md

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+---
+title: APRSdroid in Kenwood GPS Mode
+author: Georg Lukas
+---
+## Using APRSdroid with a Kenwood APRS radio (D7x0)
+
+![Screenshot of APRSdroid Kenwood mode](https://aprsdroid.org/kenwood/kenwoodroid.png){#qr}
+It is possible to use APRSdroid as the GPS receiver for a Kenwood D7x0 mobile
+rig. This way, you do not need a dedicated GPS receiver, and you can configure
+the rig to display received positions on the Android device. To connect the
+two, you will need a Bluetooth RS232 adapter that you can connect to the D7x0
+GPS port (2.5mm at the side of the control unit).
+
+However, APRSdroid will only display information. Own position beacons,
+Messaging and other APRS functions will not work from APRSdroid. The displayed
+information only consists of callsigns and positions (you can use the map in
+that way).
+
+## Configuration of APRSdroid
+
+You need to set Connection Type to Kenwood GPS port and configure the correct
+Bluetooth device in the Android preferences.
+
+Please also set Position Source to SmartBeaconing (or to Periodic GPS Position
+with "High (always on)" GPS precision). This is required to keep permanent GPS
+reception for the D7x0.
+
+## Configuration of the D7x0
+
+You need to set the D7x0 to output WAYPOINT data via the GPS port, with the
+suggested format being KENWOOD, 9-char:
+
+It was also reported that the FTM-350 transceiver supports APRSdroid in its
+"waypoint" mode.
+
+![Photo of Kenwood D7x0 config](https://aprsdroid.org/kenwood/kenwood-config-aprsdroid.jpg)