[time-nuts] Leica AT-303

[Bob Camp]

Hi

Gee… I wonder who got the other one ….:)

They are big beasts and are both heavy and a wind load. Both need to be 
taken into account when mounting them. They most certainly do have preamps
in them. Often the preamps do not work down at the 5V that a 3801 puts out. 
The gain of the antenna may or may not match up well with other gear. They
can have some pretty major amps in them. 

Best way to dig up info it to type AT503 or AT303 or whichever one you have into
Google. If you have one of the earlier ones that is just labeled L1/L2, try going 
after the Leica part number. 

It’s not real clear that they have a significant advantage for L1 only operation with a
Z3801. The receiver in a 3801 really isn’t up to the same level as the antenna. It
will in no way *hurt* the timing performance. If you already have a decent antenna with
a good view, it may not help a lot. For $100 it’s not a bad thing to play around a 
bit with.

Bob



> On Apr 22, 2015, at 5:35 PM, John Green <wpxs472 at gmail.com> wrote:
> 
> I've been away for a long time. So, I guess that makes me the new guy, all
> over again.
> I have long coveted a choke ring GPS antenna. Oh, I have several so called
> "timing grade" ones but I have always wanted a choke ring. After watching
> them on eBay for a long time and seeing them in the $600 range, I recently
> saw one up for bid starting at $99. I didn't get it, but did get a second
> chance offer and bought it. Now, I have come to realize there isn't much
> information available on them. Alas, Google is not my friend here. So, I
> was wondering, do they have a built in preamp? I kind of think not since
> they are supposed to be L1, L2 antennas. Besides, I wouldn't think you
> would need long cables for surveying. I just want to put it on top of what
> used to be my TV antenna tower and feed the Z3801 with it. Does anyone here
> own one? What do you think of it? Is there some place where I can get more
> information on it?
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