I created a highly accurate reference clock oscillator using the
TU30/TU60 units sold online (in China). For us amateur radio operators,
we have used TCXO and OCXO as reference clocks for radios/measuring
instruments, etc. We also used terrestrial analog TV burst signals to
tune the OCXO, but this has now run out and we need a real reference
clock. There are GPS receivers that output a reference clock, but they
are expensive and out of reach. This unit is inexpensive and outputs a
10KHz reference clock, and if other frequencies are required, you can
configure the necessary VCXO and output a PLL based on 10KHz. For us,
this is sufficient accuracy, and amateurs do not need any more accuracy
than this. Various information can be obtained from the unit, but this
unit displays the number of receiving satellites and the frequency lock
status, which are considered to be the minimum necessary for a reference
clock oscillator, as well as the date, month, and year. Since GPS
performs a tracking operation, it is constantly lagging and leading when
checked by phase, but there is a 9th power of frequency accuracy, so
there is no problem at all. |
