[OZAPRS] "Programmable crystal" kit

Hans Summers hans.summers at gmail.com
Tue Apr 26 16:43:43 AEST 2016

Hi all

As I mentioned on this forum a few weeks back - QRP Labs now has a new kit
out, price $18, this is a minimalist controller for the Si5351A Synth chip.
See http://qrp-labs.com/progrock .

This kit can be used as a crystal replacement in many cases where you do
not have that awkward crystal frequency and don't want to spend a lot of
money and time to get one custom made. Additionally you can connect 1pps
from a GPS and have GPS discipline (better than 0.1ppm). There are THREE
outputs so it can replace multiple crystals - and covers a wide frequency
range 3.5kHz to 300MHz (approx).

Summary of features:

   - Includes Si5351A Synth kit <http://www.qrp-labs.com/synth> 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
   <http://www.qrp-labs.com/lpfkit> 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
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