FLEXCOMM
II
C-5000 (Non-Digital)
Installation Manual
150-1355-000 Rev. M
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page 150
4. Transmitter Verification (Continued)
F. Set the Service Monitor to receive the transmit frequency of the selected channel. Connect the output
of the radio under test to the Service Monitor RF input port with a cable less than three feet in length
(refer to the Service Monitor User’s Manual).
G. Use the handset interfaced to the FLEXCOMM II system to transmit a signal, modulated from the
Service Monitor.
H. Measure the output power, output frequency, and percentage modulation (kHz deviation) with the
Service Monitor. Verify that the output frequency and power are within specification. Adjust or repair
as necessary.
I. Repeat for FM mode (Step 3 above would be FM).
5. Receiver Verification
A. Select the manual data entry page.
B. Set the receive frequency to the test frequency.
C. Set the mode to the proper modulation (FM or AM) and bandwidth.
D. Set the Service Monitor to transmit at the frequency programmed on the test unit with a 1 kHz tone
with 3 kHz deviation for FM mode, or 30% modulation for AM mode. If necessary, refer to the user’s
manual supplied with the Service Monitor.
E. Connect the output of the radio to the RF input port with a cable less than three feet in length. Set the
output power of the Service Monitor to the specified sensitivity level of the radio under test.
F. With the proper cables, route the headset audio back into the Service Monitor. Push the test button to
open the squelch and measure SINAD. SINAD should be better than 12dB for FM or 6dB for AM.
G. Increase the RF signal by 10dB and verify that the squelch gate opens.
H. Repeat (switch FM/AM modes at step 3) for the other mode.
6. Guard Receiver TX Verification
A. There is no manual data entry page for the guard unit. Frequencies programmed must be duplicated
on the Service Monitor. Begin at step F in Section 4.
7. Verification of the Guard Receive Function
A. There is no manual data entry page for the guard unit. Frequencies programmed must be duplicated
on the Service Monitor. Begin at step D in Section 5.
