Chapter 3— WIND EQUIPMENT 



2 knots from to 120 knots. The left channel 

 is for the recording of wind direction and is 

 graduated every 10° over a 540° range. 



Direction letters representing the cardinal 

 compass joints (N-E-S-W-N-E-S) are printed 

 above the appropriate numerical direction 

 values. The chart is designed for use with 

 the 3-inches-per-hour chart speed, and the time 

 lines are graduated to 10 minutes and numbered 

 every hour. Holes on either side and in the 

 center of the chart provide positive drive 

 between the chart and the sprocket drive roll. 

 The chart has a running time of approximately 

 15 days. 



CASE. — The case is made of cast aluminum 

 and has a hinged door. The door contains a 

 plastic window large enough for viewing the 

 indication scales, pens, and 7 inches of the past 

 record. It also is provided with a rubber 

 gasket to ensure a tight fit when the door is 

 closed. A recess at the bottom rear of the 

 case has connections for the power and inter- 

 component cables. 



Recorder RO-447/GMQ-29 



Figure 3-4. 



209.361 

 -Analog Recorder RO-447/GMQ-29. 



This is an analog recorder (fig. 3-4) newly 

 designed for use with the AN/GMQ-29( ), Auto- 

 matic Weather Station, utilizing inputs from the 

 UMQ-5( ) Wind System, through a complex 

 system of electronic data reception and 

 computations prior to being recorded. The 

 recorder records wind direction, wind speed, 

 and rainfall (discussed in chapter 4). It differs 

 in its presentation of recorded data from the 

 RD-108/UMQ-5 in that it records straight lines 

 instead of curved lines, uses a different chart, 

 and has different chart speeds. Presently it 

 uses ink pens and tanks similar to the RD-108/ 

 UMQ-5, but plans are for a changeover to 

 a ballpoint-type pen in the near future. Main- 

 tenance of this recorder is covered in chapter 

 4 under the AN/GMQ-29( ) Automatic Weather 

 Station. 



Model Differences/UMQ-5 



Transmitters ML-400B and ML-400C are 

 identical to earlier models, except that they 

 are larger in the synchro section to allow for 

 the use of six repeaters. 



The ID-586 indicator has no predecessor. 

 The ID-300B and ID-300C indicators are 



identical with older models with the exception 

 of the resistance strip to allow for the adjust- 

 ments needed when from one to six repeaters 

 are used. 



The RD-108B and RD-108C recorders differ 

 from earlier models primarily in the relay 

 system to allow for the one to six repeaters 

 running from the same transmitter. The 

 recorder that is available with the AN/UMQ-5D 

 has a pen stop arrangement that prevents the 

 pen from catching in the center holes of the 

 chart. 



OPERATION 



Installation of Chart 

 Speed Change Gears 



The recorder is equipped with chart drive 

 gears to give a chart speed of 3 inches per 

 hour, which matches the time graduations of 

 the chart supplied. (See fig. 3-5(A).) Change 

 gears to provide a chart speed of 6 inches per 

 hour or 1 l/2 inches per hour are mounted on 

 a stud on the left side plate of the chart drive 

 mechanism. The change gear arrangements 



43 



