EMRFD Message Archive 12682

Message Date From Subject
12682 2016-04-20 02:27:29 Hans Summers New kit: ProgRock, triple programmable GPS-disciplined crystal repla
Hi all

I hope this may be of interest to some. Even if not, you may be interested from a technical perspective in the rather nice power supply noise filter by Alan G8LCO, which is I think a better alternative to the popular transistor-resistor-capacitor active filter (capacitor multiplier).

This kit is priced $18 see http://qrp-labs.com/progrock . This is a simple minimalist controller for the Si5351A Synth kit. You set up the three frequencies (actually up to 8 selectable frequency banks) on a 4-way DIP switch and button. Connect a GPS for calibration and drift correction.


+ Includes Si5351A Synth kit AND "ProgRock" PCB kit + Easy construction, no surface-mount components to solder (Si5351A already pre-soldered) + 3 independent 3.3V p-p squarewave outputs (2 if you use GPS discipline) + You can feed the outputs through LPF kits to get sinewave outputs + 8 selectable “banks” of frequencies, chosen by 3 input control signals + Frequency range 3.5kHz to 200MHz + Extended frequency range up to approx. 300MHz if you don’t mind violating the Si5351A datasheet specifications + GPS frequency discipline using 1pps from a GPS receiver + Unique power supply noise filter circuit designed by Alan Gray G8LCO + Power supply voltage 5V, or using LM317LZ regulator (supplied), range is 5-12V DC + Minimalist configuration user interface using 4-way DIP switch, push button, and LED + Frequencies and configuration stored in non-volatilte memory (EEPROM) for next power-up

73 Hans G0UPL