Performing a Basic Over the Air Measurement


Step
 		Notes
1
 		Mode
2
 		[Over Air]
3
 		[W-CDMA Over Air] or [W-CDMA (w/ HSDPA) Over Air]
 		The menu key label changes to include "(w/ HSDPA)" if you have Option 245 - HSDPA Analyzer & HSDPA Over Air Test installed on your test set.
4
 		[Chan Std]
5
 		Select the channel standard you want using the up and down arrow buttons.
6
 		[Select]
7
 		On [Units] select Chan or Freq.
Each time you press this softkey, the selected option changes.
8
 		[Channel] or [Frequency]
  • If you selected Chan in the previous step, select [Channel].
  • If you selected Freq, select [Frequency].
9
 		Enter the channel or frequency using the numeric keypad.
  • If you selected Channel in the previous step, terminate your selection with either [Fwd] or [Rev].
  • If you selected Frequency in the previous step, terminate your selection with the appropriate unit of measure.
10
 		[Fwd]
 		Selects the forward W-CDMA or W-CDMA (with HSDPA) channel.
11
 		Verify that on [Fr/Time Ref] GPS is selected. If not, press [Fr/Time Ref], then press [GPS].
This step is not required but it can improve the accuracy of the test set frequency reference.
12
 		On [Scramble C...] select Auto or Manual.
The test set defaults to Auto mode.
  • In Auto mode the test set finds the Scramble code of the strongest pilot signal and displays the value in the metrics display.
  • In Manual mode you must enter the Scramble code using the numeric keypad.
13
 		[Level/Location]
14
 		On [Ref Level] select Abs or Rel.
Enables you to toggle the measurement reference value between Abs (absolute) and Rel (relative).
  • If set to Abs, the measurement is made in reference to absolute power and the results in the CDP chart are displayed in dBm.
  • If set to Rel, the measurement is made relative to the Channel Power and the results are displayed in dB.
15
 		[RF IN Loss]
16
 		Enter the RF In Loss using the numeric keypad.
If you are using a cable and additional devices connected to the antenna, enter the combined cable and device RF In Loss here. The RF In Loss can be obtained by measuring the Insertion loss. See "Two Port Insertion Loss"
 Note: If data has been previously entered in [RF IN Loss], that data will be lost and replaced by the new value you enter here.
17
 		[dB]
18
 		Connect to the antenna.

NOTE: The test set itself does not record data for post-processing. It provides a snapshot of W-CDMA or W-CDMA (with HSDPA) base station transmit parameters at that location.
NOTE: During a W-CDMA or W-CDMA (with HSDPA) over the air measurement, a yellow triangle symbol may temporarily appear beside "GPS" in the lower right. The yellow triangle indicates that the test set is re-synching with the GPS pulse per second signal. Once the test set is synchronized, a green dot appears in place of the triangle. If the GPS is unavailable, a red X appears. If this happens, you must choose another reference.