© Copyright 2013 Zephyr Engineering, Inc
UDPSDR-
HF1 User’s Manual
19
Version 1.1
– 16 September 2013
SDRstick
TM
. Since SDRstick
TM
discovery is a broadcast, it may succeed even though it is
on a subnet that is unreachable by the PC. Make sure that all MAC and IP addresses
on the entire network are unique, and tha
t all IP address bits with a “1” in the network
mask are the same. For example, if your PC is set to IP address 192.169.1.10 with a
net mask of 255.255.255.0, then you can set your SDRstick
TM
IP address to
192.168.1.xx, where xx=a number from 1 to 254, excluding 10 (which is already used by
your PC).
4.5 ExtIO.dll not in correct directory
Symptom
: HDSDR and/or SDR# start right up, but no SDRstick
TM
is found.
Cause
: ExtIO_SDRSTICK.dll has not been copied into the run directory.
Solution
: The ExtIO_SDRSTICK.dll file is required for HDSDR and SDR# to work with
SDRstick
TM
. Place a copy in the same directory as the executable file is located.
5 Theory of Operation
The next two sections describe the design of the UDPSDR-HF1 in very basic terms.
5.1 UDPSDR-HF1 Front-End Hardware
The UDPSDR-HF1 PCB block diagram is shown in Figure 10. The signal flow is
straightforward, with the RF signal passing through the LPF, anti-alias filter and ADC
driver before being sampled by the ADC.
The ADC can be clocked either by the on-board 80MHz clock oscillator or a CLK_IN
signal from the FPGA on the BeMicroSDK.
The audio DAC and headphone driver are not used by the current firmware, as receive
audio is sent to the PC sound system.
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