[time-nuts] eBay GPS antenna.

Bob kb8tq kb8tq at n1k.org
Tue Feb 6 21:32:39 EST 2018


If you spend some “quality time” with the pictures in the listing, the antenna
is indeed labeled “operating voltage 3.3 to 18V”. Yes, I find that a bit incredible.
If there is nonsense being generated, it’s not by the person listing the antenna 
on eBay.  My guess would be that the automotive world has pushed some odd
semiconductor outfit to tool up a regulator that does what’s needed.


> On Feb 6, 2018, at 4:03 PM, John Green <wpxs472 at gmail.com> wrote:
> I kind of have to believe the specs. The two survey grade antennas I
> already have, a Leica and a Trimble, both have regulators in the preamp
> sections. The Leica has an 8 volt one and the Trimble has a 5 volt one. I
> intend to hook it up to a variable supply and watch the current as I
> increase voltage. If it has a regulator, the current should stabilize at an
> input voltage just above what the internal preamp operates at. If not, it
> should continue to rise. I am tempted to pry it apart, even if it risks
> damage just so I can see for myself what they are using for the preamp
> stages.
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