This is an old revision of the document!
maintenance
bugs
interferences
missing high pass filter
backlight
onboard antenna
power supply
1st usb port always used to suck power (up to 700mA for TX)
2nd usb port is limited to 475mA
solution 1: patch hackrf to use 2nd port for data
solition 2: build usb cable with seperate power connector
clock input is wired to ground, connection below chip
solution: solder it on the pad of the crystal and supply with 27MHz
isp pin floating
under battery an isp header can be soldered on
one of the pins should be pulled high, but isnt (see page 52)
if it is low, the rad1o wont boot
reset pin
connecting anything to that pin will trigger reset
12k pull-up is already there, but it's still touchy
maintainence
broken display
bad power switch
remove it
put a jumper on there
working, but no data
display flickering
data transfer takes very long
yea it's just slow flash
wait
use “safe eject”/sync
rgb leds
resistors populated incorrectly/unpopulated
bug documented incorrectly
just bridge at 3 places (see page 60)
antenna connector
when soldering on an antenna
dont bridge left 2 big pads
they are very close together
would bridge power supply
Bias-T
to power an antenna through hackrf software
but “large” inductor (like 10μH) onto the smaller pads below the SMA pads (see page 62) (dont bridge with antenna pads)
if your antenna has an DC path, it might burn out the inductor (see page 63)
protection
PLL
interferences
10MHz reference output disabled in software (because most people wont use it anyway)
transceiver and PLL are now both at 40MHz
⇒ no extra spurs caused by 50MHz PLL clock
just upgrade your f1rmware