[time-nuts] Re: Documentation for Tekron Axiom42 GPSDO

[Wilko Bulte]

hello Greg,

Yes, it came from eBay.

In the meantime I traced out the connections to the 30-odd pin connector. Nothing special there: 12VDC supply, Mng Tx and Rx buffered at 3,3V level, 10 MHz square wave in LVD, PPS in LVD, Alarm buffered ar 3,3V level etc. Essentially all the signals that are on the testpoints of the PCB, and labeled on the silkscreen. But with added buffering for use in the equipment this reference was once part of.

The Trimble GPS rx GpsTxd/Rxd are directly connected to the microcontroller, these signals are not available on the 30-odd pin connector. On my unit the OCXO is also labeled Tekron, so not Rakon like the one on eBay. Messing with the Trimble rx is not in the plans, as it most likely will upset the MCU, and wreck the GPSDO in the process.

Meanwhile I have opened a support ticket with Microchip, kindly asking if they still have the OEM docs available for this TK42 module, as it used to be called. Keeping my fingers X-ed.. 

thanks,
Wilko

> On 17 Jul 2025, at 19:01, Gregory Beat via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> W -
> 
> You purchased this Tekron GPSDO from Chinese eBay reseller: gzjingzhen (sold 4)
> eBay Auction # 256929269045
> eBay Photo Helps to Work Backwards (What you bought — Components)
> —
> As noted earlier, Tekron made the PC Board and assembled components from various OEM suppliers.  Tekron was acquired by Microchip on October 2, 2020
> RAKON is the 10 MHz crystal supplier.
> 
> Mark Sims (Lady Heather support) worked with the Trimble Resolution SMT Chipset (66266-00) and noted his bench results to make it work. May 2012 (time-nuts)
> https://febo.com/pipermail/time-nuts_lists.febo.com/2012-May/049459.html
> 
> Trimble sold their GPS Chipsets & Receivers (Thunderbolt) to Protempis
> Although virtually the same people & address — harder to deal with (no answers).
> https://www.protempis.com/gnss-receivers
> 
> Trimble Resolution SMT 66266-00 Chipset — 2009 Datasheet (Russian link)
> https://www.compel.ru/item-pdf/d31a59230ece6dc101411a384f72964c/pn/trimble~resolution-smt-66266-00.pdf
> 
> greg
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