Sheroy Tata

A self taught electronics hobbyist

[Sheroy Tata @SheroyTata]

After some more fine tuning by hand I measured the time it takes to miss 1 cycle in the 10 MHz signal, taking nearly 75 s as measured over 5 times. This makes the reference as close to nearly 1.3 ppb !!!

[Sheroy Tata @SheroyTata]

Locked to GPS PPS by hand, DAC pulling range -7 Hz to +3Hz at 10 MHz!! Average over 1 s…

[Sheroy Tata @SheroyTata]

The ocxo is on!

[Sheroy Tata @SheroyTata]

@ThrillScience Does only one gps receiver have antenna cable length compensation setup? Since it looks like an offset.. not jitter…

[Sheroy Tata @SheroyTata]

The clock sync board is coming alive.

[Sheroy Tata @SheroyTata]

The clock sync board are finally ready. Time to assemble soon.

[Sheroy Tata @SheroyTata]

2 Independent GPS receivers PPS locked within 100 ns

[Sheroy Tata @SheroyTata]

@VividProwess Would you like to meet me in TA?

[Sheroy Tata @SheroyTata]

@dosdude1 Else, can a M18 chip be transferred from a neo into an iPhone? And still run?

[Sheroy Tata @SheroyTata]

@dosdude1 Can it run iPad os or something like that with just some configuration such as straps.. In an iPad then can i change the straps to run MacOS? What could stop it signed/fused A18 chips?

[Sheroy Tata @SheroyTata]

@RueNahcMohr Use a brushed DC motor in place of the reed switch.. it solves the problem of not burning out the reed switch much

I used to do this as a child as a fast HV generator.

[Sheroy Tata @SheroyTata]

Almost complete, need to fine tune.

Almost missed one feature :: When the 2 boards are away, need to track the number of periods of the OCXO on long term and compare with a sync pulse.. added it.

Board space is valuable had to replace connectors with test points.

[Sheroy Tata @SheroyTata]

The design is coming along, the power supply is done. Left is the PLL synth and the STM32 and the routing around it

The OCXO takes up a lot of board space along with keeping “low noise” nets far from the input and OCXO output

[Sheroy Tata @SheroyTata]

Space is filling fast, its unlikely i will be able to get all the connectors to the STM32 in… likely will have to resort to pin headers

[Sheroy Tata @SheroyTata]

Designing a stable clock reference with an OCXO and DAC at the control input such that 2 separate modules can be in sync.

Logging sync is conducted by an STM32

The design includes a PLL clock gen

Do you think all this can fit on a 50 mm x 50 mm 8 layer PCB?

[Sheroy Tata @SheroyTata]

@MarcoReps @PCBWayOfficial @SGirl0311 Some kind of isolated power supply

[Sheroy Tata @SheroyTata]

I need to get back to my electronics! So much more to do :)

[Sheroy Tata @SheroyTata]

But this power seems too small to affect the ADC.. need to check more

[Sheroy Tata @SheroyTata]

It looks like the spectral quality of my reference oscillator is BAD!!

Below is the spectrum from the reference oscillator vs an OCXO!…

Need to drive my clock generator with an OCXO to get better!!!

Note the spurious tone at about 25.004 MHz!!

Even cheap hardware is cool.