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X. RF Threshold Test Description A TRUE COPY CERTIFICATION ON LAST PAGE RYAN L. SUTLER, CLERK The purpose of this test is to measure the Receive Signal Level for threshold of 10E-6 by fading the TX RF. A variable attenuator is inserted between the Terminal RF Out and the Transmission Line in order to simulate a fade, i.e. reducing the Receive Signal Level (RSL) at the coordinating receiver. Please refer to the pathloss system report for RSL levels and RX threshold levels. Instructions 1. Log on to the Terminal under test if you have not already logged on. a. Connect a PC with the EM2 software installed via the serial connector on the front of the terminal labeled "COMPUTER". b. Open the EM2 software and on the initial log -in screen select "Serial" from the pull down and choose the appropriate "COM PORT" that the PC is using. c. Enter the username: "admin" (note this cannot be changed) enter the password. The default password is "password" which can be changed). Once the correct "admin" and "User password" is entered you will be "logged on" and the displayed terminal icons will go from gray to yellow to indicate communication with the terminal under test. 2. The System Test Data Sheet provided from the MNI factory will have an AGC to RSL curve on it that will be used to verify this test. From that curve ensure that the RSL specification above is met. Each terminal has a slightly different voltage curve. 3. Use the G.826 internal BER counter of the MNI EM2 software to determine threshold point of each Receive path. 4. In the EM2 software go to the "Test" and "RFU Mute" selection and MUTE all the RF portions of the terminal. Set the time to be "0" so it does not UN -Mute. 5. In the EM2 software Go to "Configuration" then "RFU" and click on "ATPC Enable" (toggle). "ATPC Off' will be displayed and hit Apply. Warning — In the field DO NOT Mute the Far End terminal unless you set a time out. You will lose communication to that terminal which can only be un -muted by logging on locally. 6. Disconnect the RF connection at the waveguide flange of the terminal and insert a variable attenuator in line with the coordinating terminal. FADE TO THRESHOLD TEST a. Set the variable attenuator to "OdB" and connect a Power Meter to the "output" of the RF cable that connects to the Receiver under test. b. In the EM2 software Go back to the "Test" then "RFU Mute" screen and set the terminal to "ONLINE". c. Connect a Digital Voltmeter to the AGC port on the coordinating receiver. d. Slowly set the Variable attenuator to the value needed to achieve 10E-6 BER. e. Write down the result Page 23 o