TM 11-6625-2837-14&P-7 TECHNICAL MANUAL OPERATOR'S ...

Section 4 TM 11-6625-2837-14&P-7
4-14. OUTPUT FLATNESS (Cont’d)
PERFORMANCE TESTS
4. Measure and record the power level indicated by the Power Meter at the following center frequencies: 1 MHz, 10
MHz, 100 MHz, 200,space 400,space 600,space 800,space and 1299 MHz.
4-15. HARMONIC SIGNALS
1 MHz -2.0_______________0.0 dBm
10 MHz -2.0_______________0.0 dBm
100 MHz -2.0_______________0.0 dBm
200 MHz -2.0_______________0.0 dBm
400 MHz -2.0_______________0.0 dBm
600 MHz -2.0_______________0.0 dBm
800 MHz -2.0_______________0.0 dBm
1299 MHz -2.0_______________0.0 dBm
SPECIFICATION:
All harmonically related signals are at least 30 dB below the desired output signal for output levels < +3 dBm. (25 dB down
for output levels above +3 dBm.)
DESCRIPTION:
A spectrum analyzer is used to measure the relative levels of the second and third carrier harmonics with respect to the
carrier fundamental at various center frequencies.
EQUIPMENT:
Spectrum Analyzer.................................................. HP 8555A/8552B/140T
PROCEDURE:
1. Set the system center frequency to 1299 MHz; set the RF Section OUTPUT RANGE switch and VERNIER control
for an output level of +10 dBm.
2. Connect the power meter/sensor to the system RF OUTPUT jack.
3. Readjust the VERNIER control for a power meter reading of +10 dBm.
4. Set the spectrum analyzer input attenuation to 30 dB. Connect the RF Section OUTPUT jack to the spectrum
analyzer RF input.
5. Set the other spectrum analyzer controls for convenient viewing of the carrier. Adjust the controls as necessary to
view the second and third harmonics. Record the harmonic levels relative to the fundamental signal.
Second Third
1299 MHz >,space 25 dB down ______ ______
4-16