transcribed from rad1o++ talk at 32c3, referencing the slides starting at page 38

• sample clocks are at 2 and 20MHz
• doubled at 4 and 40MHz
  • ⇒ interference spikes at 80, 120, 160, 200,
• goes away at 400MHz

• unpopulated in big rf area (FL301)
• RX/TX over 2.75GHz not possible
• solution 1:
  • when only RX: just bridge it
• solution 2:
  • populate it yourself

• on some rad1os the backlight might stay on and drain battery
• ⇒ unplug battery

• should be at 2.48GHz-2.5GHz
• measured at 2.35GHz

• 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

• 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

• connecting anything to that pin will trigger reset
• 12k pull-up is already there, but it's still touchy

• replace with one from a Nokia 6100

• check audio connector solder joints
• move plug around a little bit

• remove it
• put a jumper on there

• check with other/shorter usb cable

• charge battery

• yea it's just slow flash
• wait
• use “safe eject”/sync

• resistors populated incorrectly/unpopulated
• bug documented incorrectly
• just bridge at 3 places (see page 60 and RGB LEDs)

• when soldering on an antenna
• dont bridge left 2 big pads
• they are very close together
• would bridge power supply

• to power an antenna through hackrf software
• put “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)

• display and some inductors (especially rf area) are very fragile
• shield it
• put a case on it

• code improved to for better performance <2.15GHz
• just upgrade your f1rmware

• 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