Simple RF radio transmitter - ADF4351

• Simple RF radio transmitter - ADF4351
  Posted by bipolunipol on 27 Dec, 2021 05:19
• Hello!
  I would like to build a simple RF radio transmitter with the ADF4351 Development Board like:
  https://www.ebay.com/itm/35M-4-4GHz-PLL-RF-Signal-Source-Frequency-Synthesizer-ADF4351-Development-Board-/322520746831
  
  The transmitter will be used for quick testing of the work of the repaired receivers.
  The emitted wave should have the frequency set by this chip (mainly 2 - 3.5GHz). Without any modulation.
  I don't need a high power of the transmitter, let's say, for example, 6 mW.
  
  What could I do to build such a transmitter on a ADF4351 chip?
  
  Thanks
  
• #1 Reply
  Posted by radiolistener on 27 Dec, 2021 19:51
• you're needs to connect it with controller and write software to program ADF4351 registers for desired frequency.
  
  I think it will be easier for you to buy LTDZ:
  https://www.aliexpress.com/item/1005003086682197.html
  
  it has 2 x ADF4351, the mixer and STM32 controller on the board. You can use NWT software to control it.
• #2 Reply
  Posted by bipolunipol on 27 Dec, 2021 20:00
• Thank you!
  Do I need an output amplifier in this case? Is it enough to just connect the antenna?
• #3 Reply
  Posted by radiolistener on 28 Dec, 2021 18:42
• if you want to test receivers, it will be enough. No needs for amplifier, because it's output is about 0 dBm (0.22 Vrms). You may need to use some attenuator, because it's output may be too high for receiver input.
  
  yes, you can connect it to antenna. But be careful, if you use external antenna, static electricity from wind or high voltage pulse from lightning can damage it.