[time-nuts] eBay GPS antenna test.

Bob kb8tq kb8tq at n1k.org
Thu Feb 15 17:40:08 EST 2018


Just so people don’t get to down on eBay antennas: 

https://www.ebay.com/itm/Antcom-Active-L1-L2-Choke-Ring-Antenna-Item-123GM1215A-XT-1-AUTOFARM-AGLEADER/302630180910?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 <https://www.ebay.com/itm/Antcom-Active-L1-L2-Choke-Ring-Antenna-Item-123GM1215A-XT-1-AUTOFARM-AGLEADER/302630180910?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649>

Was indeed brand new in box. The pictures don’t quite give credit to the branding
on the antenna. It was shipped directly from the outfit that put the great big
letters on it. Price was a bit less than eBay would have you think, but still a bit
more than the ones from China. No idea if they will be selling any more. 

An L1 / L2 choke ring is a much better bet pattern wise than the patch antennas. It also is a
great big heavy monster of a thing to mount somewhere ….

On the down side, like a lot of what you see, it’s GPS only. At least by spec, it will 
not pass the full Glonass L1 or L2  bands. That may be why it turned up as “brand new but 
we’re unloading it”.  What the passband *really* looks like ….. we’ll see ….


> On Feb 14, 2018, at 12:23 AM, Bill Hawkins <bill.iaxs at pobox.com> wrote:
> Learned tonight that J. P. Morgan got his start by buying 25 K defective
> rifles for %3.50 each and selling them to the Army for $25 each. You
> have no reason to trust a listing.
> Bill Hawkins
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Bob
> kb8tq
> Sent: Tuesday, February 13, 2018 12:04 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] eBay GPS antenna test.
> Hi
>> On Feb 13, 2018, at 12:06 PM, Clint Jay <cjaysharp at gmail.com> wrote:
>> Agreed but stock numbers on boxes and packets  are usually Arabic 
>> numerals or a barcode. It's also possible the seller used a stock 
>> image which can be copied and pasted into Google web search to track 
>> down the maker or at least a distributor who has data.
> The seller did post a number of images for the part that was listed. The
> gotcha is that the part that arrived is not labeled the same way as the
> part that was listed.
> Since the device also has issues, the big question is if it has any
> connection to the part in the listing at all. 
> The seller seems to have been doing GPS stuff for a while. He also has a
> very good approval rating. My guess is: this isn't the first time he's
> seen a bump in the road. I'd bet he's got the ability to check this and
> that out to see what is what. 
> The seller *does* matter when you buy this stuff. That's true no matter
> what you are getting. No matter how good they are, problems do come up.
> The question is always how well they address them. We tend to dump
> pretty hard on these guys. I'm not sure that's always warrantied. 
> Bob
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