Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 224 of 252
17.4 GPS antenna connector of DB25-D and DB40-D
Socket of type SMA-female, requiring antenna with plug of type SMA-male. The
GPS antenna that comes with the Radioddity DB25-D and DB40-D is a passive one
and absolutely sufficient for use with the Radioddity DB25-D and DB40-D.
If you plan to add an external antenna to the Radioddity DB25-D or DB40-D you
need to make sure that sufficient signal input level gets to the Radioddity DB25-D
or DB40-D. This will more or less require the use of an active GPS antenna. The
option of active antennas often requires a DC voltage coupled from the radio via
the antenna line to the GPS antenna. The Radioddity DB25-D does not provide
such DC coupling. If your active GPS antenna comes with an external power
supply, it should work. However, we do not recommend to use any other GPS
antenna than the passive one that came with the Radioddity DB25-D. The
Radioddity DB40-D is prepared to also support active GPS antennas with the
required power coupled within the signal line to operate their built-in amplifier.
17.5 K1 connector of DB25-D and GD-88
At the left side of the Radioddity DB25-D and on the right side of the Radioddity
GD-88 there is a K1 socket with the following pin assignment:
Thus, an external speaker needs to have a 2.5mm TRS-plug with its ring not being
connected. The +5V line of the K1 socket is not capable of driving any electronics.
17.6 RJ45 Speaker-Microphone connector of DB25-D and DB40-D
The Speaker-Microphone is connected
via its RJ45-plug to the RJ45-socket of the
Radioddity DB25-D and DB40-D.
The RJ45 socket may also be used for
programming the radio. It is based on
3.3 V signals. The transmission speed is
115.2 kbaud. The Radioddity DB40-D may
only be programmed via this RJ45 socket.
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