[time-nuts] eBay GPS antenna test.

Bob kb8tq kb8tq at n1k.org
Tue Feb 13 11:17:36 EST 2018


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. 


> 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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