Motorola R-2001D Operator's Manual page 53

RECEIVER SENSITIVITY TEST
12 DB SINAD
AUDIO DISTORTION
Use the R-2001D
signal generator and SINAD meter to measure a receiver's performance by the following procedure:
1.
As shown in figure 4-1, connect the Analyzer's RF In/Out to the antenna connector of the receiver under test. Con-
nect the Analyzer's Vert/Sinad/Dist to the receiver's audio output. Disable all PL's and open the Squelch.
2. Set DISPLAY to Gen/Mon Mtr mode. Select a FUNCTION and set the FUNCTION switch to Generate.
3. Select the RF carrier frequency from an RF Memory table channel number or enter directly from the keypad.
4. Adjust 1KHz Level control for
60070
of rated deviation as indicated on the CRT. To prevent spurious noise modula-
tion, set MODULATION switch to Off and Ext Level control to Off.
a. With a lOOOuV RF input level, adjust the volume control to rated audio power output. EIA RS-204-C specifies that
the receiver be set to produce rated audio power before measuring 12dB SINAD.
b. Read
%
distortion directly from the DlST/SINAD scale.
5. Set RF Step attenuator to -llOdB and the variable control to mid-range. The display's RF LEVEL should indicate
about 2uV. Adjust the attenuator (lOdB steps) and the variable RF control until a 12dB SINAD reading appears on
the display.
6. From the RF LEVEL on the display, read the receiver's 12dB SINAD sensitivity in uV and dBM.
4-3