8911 - Jimmy


Location:  
	77 degrees 48 minutes S, 166 degrees 43 minutes E.  The AWS is located near Arrival Heights about 2.5 nm north-northeast of McMurdo.  Elevation approximately 200 meters.  

Hex id:
	8B3E2

Power:
	6VDC from 18 PS-6200 6 volt gel cell batteries.  Nine 12 volt gel cells and one 10 watt solar panel are used with a shunt regulator to recharge the batteries.  This configuration was necessary when we discovered that the AWS drew more power than expected and there were not enough 6 volt batteries available to power both this station and 8910 through the winter.

Aerovane:
	3-78-009 installed.

Deployed:
	Initial deployment on 5 Dec. 81 by Stearns, Savage, Thompson, and Lt. Whitlock.  We returned on 7 December 81 in order to strengthen the supporting structure and take readings with ARGOS Test Set.  Batteries were not buried due to the very hard ice covering the area.

Calibration: 
	1 December 81 2300 Z at McMurdo Lab.

Parameter		Input			Test Set Output		Difference

temperature		  8.8 C			  9.3 C			 + .5 C
			  9.0 C			  9.4 C			 + .4 C
			  8.3 C			  9.5 C			 +1.2 C
			  8.9 C			  9.0 C			 + .1 C

pressure		981.8 mb		982.1 mb		 + .3 mb
			981.4 mb		981.9 mb		 + .5 mb
			981.3 mb		981.8 mb		 + .6 mb
			980.9 mb		981.3 mb		 + .4 mb
inst wind speed		 38.9 m/s *		 45.1 m/s		 + 16%
			 19.5 m/s *		 22.4 m/s		 + 15% 
inst wind direction	  270 deg 		  269 deg	       	  ----
mean wind speed		 19.5 m/s		 22.0 m/s		 + 13%
mean wind direction	  270 deg		  270 deg		  ----
anemometer		 2.39 volts (1800 rpm)	   81 bits
			 1.19 volts (900 rpm)	   41 bits
voltage			  7.2 volts		  6.3 volts 		  -.9 volts

	* Wind speed simulated with calibration instrument 

Field Calibration:
	7 December 81 0300 Z by Savage, Stearns and Thompson

Parameter		Input			TIP output		Difference

temperature		  1.7 C			  1.1 C			 -0.6 C
pressure		976.6 mb		983.6 mb		 -0.1 mb
inst wind speed		 36.7 m/s *		 42.7 m/s		 + 16%
inst wind direction	  ENE			   56 deg		  -----
mean wind speed 	 36.7 m/s *		 42.7 m/s		 + 16%
mean wind direction	  ENE			   45 deg 		  -----
anemometer		  1.56 volts		   49 bits
battery voltage		  6.2 volts		  5.4 volts		 -1.0 volts

	* Wind speed simulated by calibration voltage

Modifications:

	1. High output generator anemometer installed.  Voltage appears in frame 7 word 1.
	2. RTG regulator diode removed.
	3. Heater circuit and diode removed.
	4. Reflective temperature probe shroud and insulating bushing installed.
	5. Minimum thermometer installed.


Comments:

	1. Power consumption is 135 mA at idle: 1.5 A at transmit.
	2. 22 more 6-volt batteries and 20 watts of 6-volt solar cells should be added next season.