[time-nuts] eBay GPS antenna test results.
kb8tq at n1k.org
Thu Feb 15 09:04:28 EST 2018
There are a number of reasons to believe that these antennas are worse
than the typical “telecom GPS” antenna for L1 only duty driving a TBolt.
If you are going to do L1 / L2 work with something like a NetRS, then indeed
you will need a dual band antenna. These (the $99 ones) are the lowest cost
“new in box” L1 / L2 antennas that I have seen. One would *guess* that their
close to horizon multi path rejection is not quite as good as a Trimble Zephyr,
a Novatel Pinwheel, or a choke ring. The ones from China
also don’t cost $1800 to $6000 when new either …
> On Feb 15, 2018, at 4:31 AM, Christoph Kopetzky <ck at cksd.de> wrote:
> are in the meantime any experiences with these gps antennas from the china seller (ms_geo)?
> I found two type of them from the same seller:
> 1) https://www.ebay.com/itm/High-Precision-L1-L2-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-antenna/162718512935?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 <https://www.ebay.com/itm/High-Precision-L1-L2-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-antenna/162718512935?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649>
> this one is the 3.3 - 18 V version with 5 dB antenna gain and 42 dB LNA gain for appr. 100 US$
> 2) https://www.ebay.com/itm/High-Precision-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-machine-control-antenna/162710405447 <https://www.ebay.com/itm/High-Precision-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-machine-control-antenna/162710405447>
> this one has 3.3 - 10 V voltage requirement and nearly the same gain values but 85 US$
> Does anyone have one oth them up and running?
> Are they much more better as a Symmetricom 58532A antenna ore the puck head variant?
> If yes I would give it also a try but the shipment time from goods from china are very high. Here to Germany there are timeframes from four to eight weeks normal. :(
> But the price
> Am 13.02.2018 um 03:05 schrieb Bob kb8tq:
>> 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.
>>> On Feb 11, 2018, at 12:44 PM, John Green <wpxs472 at gmail.com> <mailto:wpxs472 at gmail.com> wrote:
>>> They have issued a refund. The seller said that my antenna was defective.
>>> This is kind of a strange outfit. They are in Russia selling Chinese goods,
>>> shipped from China. Since I don't have to return it, I will disassemble it
>>> to see what went bad. I replied that if he could assure me that it would
>>> work on 12 volts, I might order another.
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