© Copyright 2013 Zephyr Engineering, Inc
UDPSDR-
HF2 User’s Manual
2
Version 3.5
– 3 October 2013
Note that the HF2 uses the BeMicroSDK pin assignments, not the MEC connector pin
assignments from the Samtec data sheet. Pin 1 is marked on HF2 by a white dot. The
pin 1 ends of J1 and J2 are closest to the JP1 header. The BeMicroSDK pin 1 is clearly
marked with a “1”. The two correct HF2-to-BeMicroSDK pairings are shown in Figure 2.
Keep in mind that the configuration on the right may introduce some digital noise into
the HF2 front end due to the proximity of the BeMicroSDK digital circuits positioned
directly above the sensitive HF2 front-end circuitry.
Figure 2 - The two correct HF2-BeMicroSDK pairings
1.1.1.2 J3 and P1 - Power In
Power is supplied to the receiver in one of three ways (listed in most-to-least desirable
order): J3, P1 or USB. The combination SDRstick
TM
HF2 requires 5VDC at about
950mA.
J3 and P1 are equivalent, since they are in parallel. J3 mates with a 2.35mm x .0.7mm
barrel plug (CUI part #PP-012, Digi-Key part#CP-012-ND). P1 is provided for either a
two-pin SMT header (TE part #3-647166-2, Digi-Key part #A113590-ND) or just pads
for soldering wire leads. The center pin of J3 is positive. P1 pin 1 is positive and is
marked with a white dot adjacent to the pad. See Figure 3 for details.
USB 1.1 and most USB 2.0 ports cannot power the SDRstick
TM
HF2. Some USB 2.0
ports have been observed to work, even though the 950mA supply current greatly
exceeds the USB 2.0 maximum. USB 3.0 can supply enough current, and may work.
NOTE
:
In order to use the USB port for power, the Altera USB Blaster driver must be
loaded onto the PC. The BeMicroSDK will not even turn on until this driver is properly
installed. No driver is required to power the receiver from J3 or P1. See the Quick Start
Guide.
WARNING:
NEVER APPLY EXTERNAL POWER TO J3/P1 WHILE PLUGGED INTO
ANY USB PORT! THIS CAN DAMAGE YOUR USB PORT!
J1 Pin 1
J2 Pin 1
