30
30
Development Kit
30
3.12
USB Dev
That connector can be attached to a PC to power the DevKit and to communicate with the
receiver over its USB port.
3.13
USB Host
Reserved.
3.14
REF IN
The REF IN connector can be used to feed the receiver with an external 10-MHz sinusoidial
frequency reference. See section 2.6.
Input impedance:
50
.
Input level:
between -10dBm and +14dBm (0.2Vpp to 3.2Vpp).
3.15
Buttons
Pressing the nRST button drives the nRST pin of the AsteRx-m2a low, which resets the
receiver.
Pressing the LOGGING button drives the Button pin of the AsteRx-m2a low. This can be
used to enabled and disable logging, as described in section 2.10.
The buttons are also connected to J601 and J602 2-pin headers (see above picture). Tying
the nRST or LOGGING pins of these headers to ground is the same as pressing the
respective button.
3.16
SD Card Socket
The receiver can log files on the micro SD Card in this socket. See section 2.10 for a
description of the SD Card logging.
nRST
LOGGING
GND
