[time-nuts] eBay GPS antenna test.

Clint Jay cjaysharp at gmail.com
Tue Feb 13 12:07:48 EST 2018


Oh, and Google has a handy translation tool which does a reasonable job of
translating Chinese text from a jpg image so that's also worth a try.

On 13 Feb 2018 16:18, "Bob kb8tq" <kb8tq at n1k.org> wrote:

> Hi
>
> That can be a bit harder if the labels are all in Chinese. Maybe posting
> pictures of the label? That way those (not I) who can read Chinese might
> spot something that allows a search to proceed.
>
> Bob
>
> > On Feb 13, 2018, at 11:06 AM, Clint Jay <cjaysharp at gmail.com> wrote:
> >
> > Sounds like a drop shipping operation, they've found a supplier in China
> > who is willing to send goods either in plain wrapping without any
> supplier
> > name or the name of the agent who's selling it. It can be useful to
> Google
> > anything that looks like a part number on the packaging, you'll often
> find
> > the main wholesaler or even the manufacturer.
> >
> > On 13 Feb 2018 15:48, "John Green" <wpxs472 at gmail.com> wrote:
> >
> >> Bob wrote:  Sitting here casually reading the data sheets for some of
> the
> >> modern Trimble
> >> survey receivers - they have gone to 7.2V (just below your 7.5V trigger
> >> point)
> >> as an antenna supply voltage.
> >>
> >> Who knows what that might imply relative to this antenna.
> >>
> >> After getting my refund, I sent the seller a message saying that I would
> >> buy another if he could assure me it would work at 12 volts. He replied
> >> that he needed to get his hands on a couple and do some testing first.
> The
> >> antenna that I received seems to be different to the one pictured in the
> >> eBay listing. At least the labels are different. I get the feeling he is
> >> kind of a third party dealing with someone in China who is wholesaling
> >> antennas made by someone else. Who really knows what spec. these are
> made
> >> to, or by who. In my former place of employment, we made an SMB
> terminator.
> >> Basically, a 75 ohm resistor soldered across the pins of an SMB
> connector,
> >> then molded in black plastic. We bought the connectors from a Chinese
> >> supplier who supplied them in individual plastic bags. We had to cut the
> >> parts out of the bags before processing, which added a labor step. We
> tried
> >> to get the supplier to sell them to us packaged in bulk, but they
> refused.
> >> We decided that they were actually buying them from someone else and
> just
> >> doing a passthru. The connectors themselves would change from time to
> time,
> >> which caused problems in molding, and sometimes caused the electrical
> >> performance to degrade. Getting parts to reliably meet a specification
> from
> >> China can be a problem. I can't even imagine the issues that could arise
> >> when you try to source an assembly, or completed product.
> >>
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