[time-nuts] Discussion of precise time and frequency measurement

Ronald Held ronaldheld at gmail.com
Tue Dec 18 14:13:12 UTC 2007


Brooke:
   Good idea but my balcony faces north.
                        Ronald


---------- Forwarded message ----------
From:  <time-nuts-request at febo.com>
Date: Dec 17, 2007 8:05 PM
Subject: time-nuts Digest, Vol 41, Issue 63
To: time-nuts at febo.com


Send time-nuts mailing list submissions to
       time-nuts at febo.com

To subscribe or unsubscribe via the World Wide Web, visit
       https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
or, via email, send a message with subject or body 'help' to
       time-nuts-request at febo.com

You can reach the person managing the list at
       time-nuts-owner at febo.com

When replying, please edit your Subject line so it is more specific
than "Re: Contents of time-nuts digest..."


Today's Topics:

  1. Re: Discussion of precise time and frequency measurement
     (Brooke Clarke)
  2. Re: HP5359A non-linearities (SAIDJACK at aol.com)
  3. Re: HP5359A non-linearities (Poul-Henning Kamp)
  4. Re: HP5359A non-linearities (Magnus Danielson)
  5. Re: HP5359A non-linearities (Magnus Danielson)
  6. Discussion of precise time and frequency measurements
     (Ronald Held)


----------------------------------------------------------------------

Message: 1
Date: Mon, 17 Dec 2007 16:09:31 -0800
From: Brooke Clarke <brooke at pacific.net>
Subject: Re: [time-nuts] Discussion of precise time and frequency
       measurement
To: Discussion of precise time and frequency measurement
       <time-nuts at febo.com>
Message-ID: <47670FBB.10701 at pacific.net>
Content-Type: text/plain; charset=us-ascii; format=flowed

Hi Ronald:

Some people interested in the WAAS aspect of GPS have used the common Ku band
satellite TV dishes as reflectors and mounted a GPS antenna at the focus (where
the Ku band antenna would normally be located.

The claim is that it works well even though the polarity of the reflected GPS
signal is backwards.  You probably can get one of these antennas and it's mount
for free since there's millions of them all over the world.  The neat thing is
that you can have it sitting back on the balcony pointing at the clear opening
(remember it's an offset feed so the dish needs to point much lower than where
the dish faces.)

You would only have a partial sky view but if your balcony faces any direction
except North, they you should get a lock some of the time.  Note there are no
GPS sats within 30 degrees of the North or South pole so a GPS antenna pointed
up to the North in the northern hemisphere will not see too many sats.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam




More information about the Time-nuts_lists.febo.com mailing list