Receiver Tests; Receiver Sensitivity And Centering Frequency - Ramsey Electronics COM3010 User Manual

3.20 Receiver Tests

3.20.01 Receiver Sensitivity and Centering Frequency

This procedure will give the technician a general indication of receive sensitivity and frequency
accuracy. For more precise sensitivity measurements see "3.20.02 SINAD Measurements".
Receiver Sensitivity
1. Connect a test cable between the COM3010 RF OUT jack and the receiver to be tested.
2. Set the receiver to be tested to the desired test frequency. See the receiver's owners
manual. Example 464.550 MHz.
3. Set the COM3010's Generator to the desired test frequency.
4. Property of Ramsey Electronics, Inc. Set the COM3010's RF Level to minimum, 0.025uV.
5. Set the Level Step Size to 0.025 uV.
Do not reproduce or distribute.
6. With the Level Field selected use the
7. Increase the RF level until the squelch breaks or the receiver achieves full quieting.
8. Read the sensitivity in microvolts in the RF Level field.
Centering Frequency
9. Set the Generate Frequency Step Size to 500 Hz.
10. With the Generate field selected use the
and decrease the Generator around the desired test frequency.
11. Verify that the best quieting is achieved at the desired test frequency. If not, a receiver
frequency alignment will need to be done. See the radio's service manual.
TYPICAL TEST PROCEDURES
UP Arrow to increase the level in 0.025uV steps.
UP Arrow and Down Arrow
41
keys to increase