I doubt the MMIC of the circuit used by w1vd is required here,
the Si4432 already has a high gain amp to make the 30mhz crystal oscillate.
So just a couple diodes plus some caps and coils, here's a more detailed description
of the frequency tripler:? ??
The description was quite useful to me, wasn't obvious how?that thing worked.
Alternately, G0UPL sells a couple different si5351 kits that can be GPS disciplined:
? ??
? ??
and a GPS:
? ??
The VFO in the first link includes a display and rotary encoder.
The second is cheaper, apparently configured by switches and/or a serial port.
Either can create very accurate quadrature clocks across all of HF:??
/g/qrptech/message/326Could be useful for many other projects as well.
I don't believe you have to use his GPS.
Jerry, KE7ER
On Fri, Jan 10, 2020 at 08:36 AM, Jerry Gaffke wrote:
Interesting, good to know how accurate the Si4432 is, and how to correct it.
Any error in the frequency of an Si4432 will be due to the 30mhz crystal reference oscillator.
The ideal would be to generate a GPS disciplined 30mhz reference that we feed the Si4432.
Fortunately, 30mhz is the third overtone of the 10mhz commonly available from a GPS module:
? ??
Jerry, KE7ER
