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without notice.
February 2007 Page 9 of 17 Revision C
Connect the equipment as shown in Figure 2, then proceed as follows:
(a)
Increase power from the signal generator to attain an output power measurement of
3 watts as indicated on the output power meter.
(b)
Measure input power and calculate gain. Gain should be a nominal 50 dB
(c)
Vary the frequency of the sweep generator across the band from 250 KHz to 150
MHz. Note that the variation of gain is /- 1.5 dB
3.3 Measurement of Harmonics
Equipment required:
(a)
Sweep/Signal generator
(b)
Attenuator, 20 dB
(c)
Power Meter - HP434A
(d)
Spectrum Analyzer
Connect the equipment as shown in Figure 3 then proceed as follows:
(d)
Adjust the sweep/Signal generator at a CW center frequency of 150 MHz for an
indicated output of 25W on the power meter.
(e)
Using the spectrum analyzer, check that the level of harmonics are less than -25 dB
with respect to the carrier.
(f)
Vary the frequency of the generator from 250 KHz to 150 MHz, the harmonics
should remain at -25dBc or below.
Chapter 4 Maintenance
4.1
Introduction
The E&I 325LA RF amplifier requires no periodic maintenance. The instrument is unconditionally
stable and is fail safe under all load conditions. Damages can only be externally caused by an input
signal in excess of the specified IV RMS maximum.
This chapter therefore, deals only with certain fundamental procedures for fault location and with the
subsequent re-alignment procedures.
Performance limits quoted are for guidance only and should not be taken for guaranteed performance
specifications unless they are also quoted in Figure 1.
