[OZAPRS] Crystal replacements
hans.summers at gmail.com
Fri Mar 25 20:33:09 AEDT 2016
Please note I am preparing a new QRP Labs kit that will be a kind of
"programmable crystal", a replacement for hard-to-find crystals. It won't
suit every application but in many cases, will be a good alternative to
ordering expensive custom-made crystals.
It should be available in about 3 weeks (currently packing kits) and cost
It's an Si5351A synthesiser chip with simple controller. It can generate
three separate outputs simultaneously in the range 3.5kHz to around 300MHz.
There are three "select" input signals allowing you to select from one of
eight banks of programmed frequencies. Additionally you can connect 1pps
from a GPS receiver to get GPS-discipline (frequency calibration and drift
correction). Programming of frequencies is by a button and 4-way DIP switch
which is intended to be done once only (or infrequently). Thereafter the
frequencies are stored in non-volatile memory in the microcontroller.
73 Hans G0UPL
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