BASIC Tech Group - MyNews 10 - ADF4351 project, LPFs, RF Meter update

Wow! Says Gordon (G4EBF) who is building a 35MHz - 4.4GHz VFO based on the ADF4351, to program this he is learning about the Arduino. Today he says he he has got the Arduino IDE installed on his PC, has configured it, and has loaded his first program to Blink and LED. Well done, that's the way everyone starts with the Arduino, and that's what we did at BARS during the Concept SDR project last year.

I have received a set of LPFs from LanguageSpy and have put the values of the components into LTSpice to see what they yield.



And this is the response in LTSpice for the 20m filter:





Quite a nice response and sharp cut off, with a little bit of ripple in the passband.

I have decided to order their 17m filter and use this in my RFMETER design to filter the Si5351 DDS output and remove higher harmonics. The RFMETER design is now complete.



I will be ordering the PCBs (10) very soon.