[time-nuts] Newby with questions

[Pete Lancashire]

A bit OT: Those Odetics I have quite a few of the antennas were mount
on radio towers, on mountain tops, we ended up
putting heaters on a few of them when one was found 'inside' a few
inches of ice one winter.

On Mon, Feb 28, 2011 at 10:01 AM, Bob Camp <lists at rtty.us> wrote:
> Hi
>
> One long term issue with the skylight:
>
> Stuff (snow, rain, birds, space aliens) can pile up on the skylight. That
> messes with the GPS signal. You really want to get the antennas outdoors if
> at all possible.
>
> When you do get them outdoors, don't forget that the electric code (and
> common sense) requires that you put a proper ground and lightning arrestor
> on them.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of David VanHorn
> Sent: Monday, February 28, 2011 12:45 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Newby with questions
>
>
> The 24 GPS satellites are in orbits that never pass over the  poles.
> I think they are about 60 degree inclinations.   By your description
> you must be in the northern hemisphere.  If you can,  set up your
> antenna so it can see to the south and don't worry if the view of the
> north is blocked because as you found there is nothing to see there.
>
>
> I see!  So I could move the antennas closer to the north side of the
> skylight, letting the skylight wall on the north side get up around 60
> degrees, so that my view to the south is more optimized.
>
> I also see the notes on the temp sensor, just ordered some rev C parts that
> I can change out here as needed.
>
>
> I'm going up on the forklift today to connect the second feed (didn't have
> enough adaptors Friday for N-F) and I'll nudge the positioning a bit, then I
> can do the survey on the other antenna.
>
>
> I understand that the Tbolt should be giving me WAY better than 1PPM, but
> that's exactly what I wanted.  Until I started pushing this issue, we didn't
> calibrate anything, and our test gear was in constant disagreement.  If you
> can't measure it, you can't improve it, and I'm tired of measuring with
> unmarked string.. <VBG>
>
> My next problem to solve, is distributing the signal through the production
> floor. I won't need phase accuracy between the drops, but I don't want to
> induce any significant error.  My initial thought was simply to amplify and
> split like CATV drops, but I'm seeing that this may not be the best
> approach.  I have a 75 ohm video distribution amp on order that will serve
> my immediate needs, maybe something better later on.
>
> Question:  Is there a way to have the Tbolt shut off the 10 MHz output if it
> is not reliable? I'd rather have no signal than an unreliable signal.
>
>
>
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