The goal of this project is to build a small HF/VHF/UHF RF generator with correct and good performance for the lab.

The synthesizer is based on ADF4351 (35Mhhz to 2500Mhz),  plus AD9850 for lower frequency range DC to 40Mhz

For a good stability, the clock reference come from a OCXO @10Mhz, particular attention will be carried on power supply, with the employ of low drop, low noise regulator.

A useful “tracking” function is available, a small cheap little board with AD9833 will ensure a NBFM modulation from 1khz to 30khz.

Due to high number of I/O needed, the MCU is based of Arduino MEGA.

The output power will be controlled with a programmable PE4306 attenuator.

Final filtered output signal will be measured with a ADL5513 log detector.

All of data are displayed on a 4×20 LCD.

Specifications:

• Covering DC to 4.4Ghz.
• LF/HF output 1Hz to 35Mhz
• HF/VHF/UHF 35Mhz to 2.5Ghz with harmonic filtering.
• RAW unfiltered 35Mhz-4400Mhz output (with harmonics).
• Band selector DC-35Mhz /35/50/145/435/1240/2345/3000/4400Mhz.
• Step size 10M/1M/100k/10k/6.25k and more.
• Tracking mode, internal modulator 1/30khz.
• Output level adjustable from -25dbm to +5dbm. (35 to 2500mHz)
• Internal 10mhz precision reference with OCXO.
• Harmonics rejection with 4 bands filtering switch.

update 09/2018, Back on this project…

TODO: Build the proper power unit, harmonic filter, AD9850, and level detector integration,

Related ADF4351 project