[time-nuts] Has anybody checked this? GPSDO in kit

Giuseppe Marullo giuseppe at marullo.it
Sun Oct 23 19:05:24 EDT 2016

Hello Attila,

not cheap at that point, and I already have that ST board(I live few km 
from ST headquarters, BTW)!.

Still licking my wounds from Eclipse-whatever chaintool, ouch, no way I 
am going to mess with that again anytime soon.

I am not in the mood to start another endless project, way too many 
unfinished stull in my drawers(as many others I guess).

I like the qrp-kit kit, but I will have a good look at eevb for the 
"thunderbolt in disguise" and then I will decide.


Giuseppe Marullo


On 10/23/2016 5:52 PM, Attila Kinali wrote:
> On Sun, 23 Oct 2016 15:32:33 +0200
> Giuseppe Marullo <giuseppe at marullo.it> wrote:
>> I am puzzled about what to do, still the total cost of it for a OXCO +
>> GPS(unit with antenna) + control mcu is 67usd, I doubt I could find
>> anything like this for a cheaper price new.
> Yes, it's cheap for a kit, but it is not that cheap if you want to be cheap. :-)
> You can get GPS modules for as low as $5 on ebay (these are new),
> a uC board for another $10-30 (even cheaper on ebay) and a quite good
> OCXO for $10-30, also from ebay. A few wires, a bit of programming and
> you have an GPSDO that beats the progrock. So, by buying the right stuff
> you can stay below $30 and have something that will get you a long way
> for experimenting.
> Just for the fun of it:
> http://www.ebay.com/itm/STM32F030F4P6-ARM-CORTEX-M0-Core-Mini-System-Development-Board-5V-3-3V-/371769616187?hash=item568f32273b:g:seAAAOSwXeJYCx63
> $1.40
> http://www.ebay.com/itm/MCP4725-I2C-DAC-Breakout-Development-Board-12Bit-Resolution-/401209928223?hash=item5d69f9aa1f:g:j5gAAOSw34FVH5b1
> $1
> http://www.ebay.com/itm/Aircraft-Flight-Controller-w-Ublox-NEO-6M-GPS-Module-for-Arduino-APM2-/182318966076?hash=item2a730ea53c:g:QuoAAOSwOVpXc3K~
> $5.04
> http://www.ebay.com/itm/1-USED-ISOTEMP-OCXO-143-141-10-MHz-5V-SC-CUT-Square-Wave-Crystal-Oscillator-/331997554003?hash=item4d4c98a553:g:w~sAAOSwCGVX~g24
> $16
> Total cost: ~$25 including shipping and all but the OCXO are new.
> You will need programmer for the uC board, if you don't have that, change
> the uC board for an STM32F0DISCOVERY board:
> http://eu.mouser.com/ProductDetail/STMicroelectronics/STM32F0DISCOVERY
> Of course, any "real" GPSDO will beat this one by orders of magnitude
> in phase noise and stability, but they are also much less fun to build :-)
> 			Attila Kinali

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