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How To Make FCC In-Channel Response Measurements

(FCC limit: , + 2 dB)

The frequency response of any channel can be measured using the

spectrum analyzer mode. A flat signal source must be inserted at the

input of the modulator or processor. In testing a modulator this

source may be a full field multiburst signal, or a sweeping function

generator. For a processor, a bench sweep generator or a broadband

noise source may be used. The response is monitored with the

Stealth receiver in the spectrum analyzer mode. A 5 or 10 MHz span

may be used. The “Max Hold” function is used to ensure that the

peak levels are measured at all frequencies. The scale may be set to

as low as 0.5 dB/div, but the operator will use the appropriate scale

setting to enable display of the full response on screen. The operator

then positions the markers at the maximum and minimum points of

the display and reads the “delta” indicated at the bottom of the

screen. The FCC requirement is a window of ±2.0 dB, which means

the delta should be < 4 dB.

How To Make CSO/CTB Measurements

CSO (Composite Second Order) is a clustering of second order beats

at any frequency in the spectrum, which causes interference to

picture quality when they fall within the video bandwidth. CTB

(Composite Triple Beat) is a clustering of third order distortion

products usually around the video carrier frequency.

The ability to make these measurements allows the technician to

troubleshoot and correct the cause of this unwanted distortion.

NOTE: It is recommended that a < 12 MHz band pass filter be used

to limit the amount of intermodulation distortion caused by

overload of the RF input of the receiver. If a preamplifier is

used, it should be placed between the bandpass filter and the

receiver.

Press the CSO/CTB soft key to initiate CSO/CTB measurements.

The unit will first switch to a 30 kHz resolution bandwidth, measure

the carrier and then prompt you to turn the carrier off.

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Philips 374803016 Manual de usuario (8 paginas)

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