[SCIGN-0109] TABL operating Subject

[Ken Hudnut - USGS, Pasadena]

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SCIGN Electronic Mail    Mon Oct 23 14:26:11 PDT 1995      Message Number 0109
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Author: Ken Hudnut - USGS, Pasadena
Subject: TABL operating

Subject: New station TABL
 
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TABL:
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Installed at Table Mountain Observatory (Solar Test 2 bldg).
 
receiver  S/N 04357 [model - LP 700845-6-(1)]
antenna   S/N 11474 [model - DM 700936 (A)]
 
antenna height (to base of pre-amp or DHPAB) =  0.0827 meters
 
It is located at approx.
 34 22.94270 N; 117 40.68300 W; 2200 m 
(from receiver C/A during installation)
 
The antenna is mounted on a Scripps drilled monument, and the
datum mark for measuring the antenna height is a ~1/8" dia. drilled 
hole in the vertical pipe of the monument (on the ESE side).
This hole is 1.03" down from the base of the adaptor.
 
The antenna height given was calculated from 3 quantities;
 
A) Field measurement of bottom of ground plane to top outer lip of
        the lower half of adaptor (= 2 3/8", = 60.325 mm) (from D. Baisley's notes; 10/19/95)
B) Qty. 'B' = 2.25" (= 57.15) mm, measured from the top edge of the drilled hole
        to the top outer lip of the lower half of adaptor. (from F. Wyatt's notes; 10/6/95)
C) Ashtech diagram for bottom of ground plane to base of pre-amp
        (= 34.80 mm)
 
        DHPAB = B + (A - C) = 82.675 mm
 
The measurement from the top of the drill hole to the pre-amp
base itself was not made on 10/19/95, and will be made on a future
visit to the site as a check on this initial antenna height.
 
The data for this site are being downloaded daily by the USGS, and
begin on day 292 of 1995. These data are all avaible by anonymous
ftp from either USGS (tango.gps.caltech.edu) or SOPAC (toba.ucsd.edu)
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[Mailed From: Ken Hudnut <hudnut@seismo.gps.caltech.edu>]