ANTENNA DIMENSIONS
                        ------------------

Pictures for most of the antennas given here are available at the NGS
on the WWW page:

       http://www.grdl.noaa.gov/GRD/GPS/Projects/ANTCAL

The L1 and L2 antenna phase center offsets given in these drawings here
are manufacturer values and should not be used anymore. The official IGS set
of mean offsets and elevation-dependent phase center variations are given
in the file IGS_01.PCV.


          Rogue: DORNE MARGOLIN R  (JPL Design)

                         -----
                     /     +     \                        <-- 0.096  L2
                    |      +      |                       <-- 0.078  L1
  +-----------------+-------------+------------------+    <-- 0.070  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <-- 0.006
+--------------------------x---------------------------+  <-- 0.000  ARP

<--                      0.381                       -->


    Rogue:  DORNE MARGOLIN B  (Allen Osborne Design)

                         -----
                     /     +     \                        <--  0.096  L2
                    |      +      |                       <--  0.078  L1
  +-----------------+-------------+------------------+    <--  0.070  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
  +-----------------+------x------+------------------+    <--  0.000  ARP
                    |             |
                    +-------------+                       <-- -0.011
                          ||  ||

  <--                    0.351                     -->


             TurboRogue: DORNE MARGOLIN T

                         -----
                     /     +     \                        <--  0.128  L2
                    |      +      |                       <--  0.110  L1
  +--------------------------------------------------+    <--  0.102  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <--  0.038
+-------------------+-------------+--------------------+  <--  0.035  BCR
                    |             |
                   =|             |
                    +------x------+                       <--  0.000  ARP

<--                      0.381                       -->


                Trimble: 4000SLD L1/L2

                          / \
                        /     \
                      /    +    \                         <--  0.057  L1
                    /      +      \                       <--  0.056  L2
+-----------------+-----------------+------------------+  <--  0.051  TGP
+--------------+-----------------------+---------------+  <--  0.050  BGP
               |                       |
               |                       |
               +-----------x-----------+                  <--  0.000  ARP=BPA

               <--       0.198       -->
<--                      0.483                       -->


             Trimble: 4000SX MICRO (square)

                          / \
                        /     \
                      /    +    \                         <--  0.057  L1
                    /      +      \                       <--  0.056  L2
+-----------------+-----------------+------------------+  <--  0.051  TGP
+----------------+-------------------+-----------------+  <--  0.048  BGP
                 |                   |
                 |                   |
                 +---------x---------+                    <--  0.000  ARP=BPA

               <--       0.197       -->
<--                      0.606                       -->


           Trimble: 4000ST L1/L2 GEOD (Mod.14532)

                       ----+----                          <--  0.070  L1
                    /      +      \                       <--  0.068  L2
++----------------+-----------------+-----------------++  <--  0.063  TGP
++---------------+-------------------+----------------++  <--  0.060  BGP
                 |                   |
                  |                 |
                   |               |
                    +------x------+                       <--  0.000  ARP=BPA

                    <--  0.140  -->                                   BPA
                 <--     0.155     -->                                TPA
 <--                     0.467                      -->               NOTCHES
<--                      0.483                       -->              EDGE


   Trimble: TR GEOD L1/L2 GP     (Mod. 22020, compact, with groundplane)
            TR GEOD L1/L2 W/O GP (Mod. 22020, compact, without groundplane)

                       ----+----                          <--  0.0625 L1/L2
                    /      +      \
++----------------+-----------------+-----------------++  <--  0.0591 TGP
++---------------+-------------------+----------------++  <--  0.0556 BGP
                 |                   |
                  |                 |
                   |               |
                    +------x------+                       <--  0.000  ARP=BPA

 <--                     0.467                      -->               NOTCHES
<--                      0.483                       -->              EDGE


              Trimble: DORNE MARGOLIN TRIM

                         -----
                     /     +     \                        <--  0.128  L2
                    |      +      |                       <--  0.110  L1
  +--------------------------------------------------+    <--  0.102  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <--  0.038
+-------------------+-------------+--------------------+  <--  0.035  BCR
                    |             |
                   =|             |
                    +------x------+                       <--  0.000  ARP

<--                      0.381                       -->


         Ashtech: GEODETIC L1/L2 L

                           ^
                 +-------------------+
  +--+ +-------+-----------+-----------+--------+ +--+    <--  0.064  TGP=L1=L2
+-+--+ +------------+-------------+-------------+ +--+-+  <--  0.060  BGP
                    |-------------|
                    |-------------|
                    |-------------|
                    |-------------|
                    +------x------+                       <--  0.000  ARP=BPA

                  <--    0.080    -->
      <--                0.220                 -->
<--                      0.286                       -->


              Ashtech: DORNE MARGOLIN ASH

                         -----
                     /     +     \                        <--  0.128  L2
                    |      +      |                       <--  0.110  L1
  +--------------------------------------------------+    <--  0.102  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <--  0.038
+-------------------+-------------+--------------------+  <--  0.035  BCR
                    |             |
                   =|             |
                    +------x------+                       <--  0.000  ARP

<--                      0.381                       -->


              Ashtech: GEODETIC III L1/L2

                     _____________
                    /             \
                +---       +       ---+                   <--  0.072  L1=L2
+------------------------------------------------------+  <--  0.065  TGP
+-------------------+-------------+--------------------+
                    |             |
                   =|             |
                    +-------------+                       <--  0.018
                        |     |
                        +--+--+                           <--  0.000  ARP

<--                      0.368                       -->


                Leica SR299/SR399: INTERNAL

                          / \
                    /             \
              /                         \
        /                                     \
   /                       +                       \      <--  0.091  L1/L2
   |                                               |
   +-----------------------------------------------+
   +-----------------------------------------------+
   \-----_____                           _____-----/
              -----____   +x+   ____-----                 <--  0.000  ARP=TOP
                       |  > <  |
                       ===| |===
                       ===| |===
                         -+ +-
                         |   |
                         |   |
                       +-+   +-+
                       |       |
                     +-        +-+                        <-- -0.100
                     |      =====|====\\                  <-- -0.108
                  +--+-----------+--+   \\
                  +-----------------+     \\
                   =--=         =--=       ||
                  ===================      ||
                                           ||
                                           ||
                                          //
                            _ _ _ _ _ _ //
                           |           /
                           |         /
                           |      _/
                            \ _ -                         <-- -0.350
                             |


             Leica SR299E/SR399E: EXTERNAL WITH GP
                                  EXTERNAL WITHOUT GP

                          / \
                  /                 \
          /                                 \
   /                       +                       \      <--  0.039  L1/L2
   +-----------------------------------------------+
   +-----------------------------------------------+
            \ ---------+  +x+  +---------/                <--  0.000  ARP=TOP
                       |  > <  |
                       ===| |===
                       ===| |===
                         -+ +-
                         |   |
                         |   |


                  M-PULSE L1/L2 SURVEY

                  +-----------------+                     <--  0.140
+===+=============+========+========+==============+===+  <--  0.124  TCR
    |                                              |
    |                                              |
    |                                              |
    +--------------------+---+---------------------+      <--  0.054  BCR
                 | |     |   |
                         |   |
                         +-x-+                            <--  0.000  ARP

    <--                  0.300                   -->
<--                      0.356                       -->



   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering
   TGP: Top of Ground Plane               BGP: Bottom of Ground Plane
   TPA: Top of Preamplifier               BPA: Bottom of Preamplifier
   TOP: Top of Pole