[time-nuts] Errors on HP 58503A GPS time & frequency reference receiver bought from yixunhk.

Dr. David Kirkby (Kirkby Microwave Ltd) drkirkby at kirkbymicrowave.co.uk
Thu Dec 11 20:16:12 EST 2014

Hi Stuart,
Several people have contacted me about the fakes. I can't understand why
his feedback is so good.  The seller bought some calibration standards from
me which I clearly stated were damaged.  I did at the time notice they left
about 25% negative or neutral feedback,  so was expecting that, but they
never left any feedback for me.
On 12 Dec 2014 01:00, "Stewart Cobb" <stewart.cobb at gmail.com> wrote:

> I have bought several items from this seller and left positive feedback
> because the items arrived promptly and appeared to work. Problems only
> became apparent days, weeks, or months later. But by then it was too late
> to change feedback.
> This seller admits to changing the firmware on a GPSDO to "upgrade" it to a
> more valuable part number. I bought a device from him for which included a
> newly fabricated sheet-metal case complete with new false trademarked
> labels.  It's a very good fake, but it was not in fact produced by the
> manufacturer whose name is on the label, and it did not meet the
> requirements of the device inside. I have bought other devices from him
> which had other problems.
> It is possible that the seller is obtaining his stock from other sources
> inside China, and that he is not directly involved in changing firmware or
> creating fakes. It is possible that he himself is an innocent victim of
> sharp practice by others. I make no direct accusations. However, the
> equipment I have obtained from this seller in the past has not proved
> satisfactory to me over the long term, and I have chosen not to do business
> with this seller in the future.
> Cheers!
> --Stu
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