Subject: [IGSMAIL-1332] Ashtech Chokering Antenna
From: W. Gurtner
Date: Wed, 29 May 1996 14:53:23 PDT

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IGS Electronic Mail      Wed May 29 14:53:23 PDT 1996      Message Number 1332
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Author: W. Gurtner
Subject: Ashtech Chokering Antenna

Dorne Margolin Antenna for Ashtech Receivers
--------------------------------------------

The current antenna diagram file antenna.gra to be found at the IGS
Information System contains the following diagram for the Ashtech
Choke ring antenna:

              Ashtech: DORNE MARGOLIN ASH

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

<--                      0.381                       -->

Recently I got from Polish colleagues a copy of a drawing (which came together
with their antenna, model 700936) containing different numbers (rounded to the
millimeter):

                         -----  
                     /     +     \                        <--  0.121  L2
                    |             |                                       
  +--------------------------------------------------+    <--  0.101  TCR
  |                        +                         |    <--  0.095  L1
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <--  0.038
+-------------------+-------------+--------------------+  <--  0.035  BCR
                    |             | 
                   =|             |  
                    +------x------+                       <--  0.000  ARP

<--                      0.379                       -->

My questions: Is anybody using the original values of the first diagram
in their data analysis or can we replace them by the obviously "more official"
ones of the second diagram?

Werner Gurtner

[Mailed From: Werner Gurtner <[email-masked]>]