Very simple software for PLL ADF4351 and ATTiny13 can be compiled with arduino and microcore https://github.com/MCUdude/MicroCore
v 0.1 Ondra OK1CDJ 9/2018 firstname.lastname@example.org
ADF4351 eval board from eBay or Ali for aprox. 17 USD.
Please check the ADF4351 datasheet or use ADF4351 software to get proper PLL register values.
Simple CW beacon. SW is to large for ATTiny13. You can use ATTINY45/85 on same PCB. Beacon send string in morse code like - OK1CDJ JO70VA and then continous tone for 5s.
PIN layout of ATTINY13/45/85
MCU is powered by 3.3V directly from PLL board.
pin 3 - PB4 to ADF4531 clock (CLK)
pin 2 - PB3 to ADF4531 data (DATA)
pin 7 - PB2 to ADF4531 latch enable (LE)
Kit is available here: