Analogue Tv: Measuring The Video / Audio Ratio (V/A); Analogue Tv: Measuring The Fm Deviation - Promax US TV EXPLORER 2 User Manual

So, if there are ten carriers with a level around 90 dBµV, their equivalent level will be:
90 dBµV + 10 log 10 = 100 dBµV
Observe that in this case, loss of tuning by overload of the RF input may occur besides
other effects such as tuner saturation and generation of intermodulation products that
may mask the spectrum visualization.

5.14.2 Analogue TV: Measuring the Video / Audio ratio (V/A)

In the Audio/Video measurement mode, on the screen appears the following
information:
0
FREQ:
CH:
Figure 24.- Measurement of the video/audio rate
In addition to the video carrier / audio carrier level ratio (35.3 dB in previous
figure) it also shows the frequency or channel, depending on the tuning mode selected,
the carrier level and the Carrier/Noise ratio.

5.14.3 Analogue TV: Measuring the FM deviation

The US TV EXPLORER II measures the deviation in frequency of any modulated
analogue carrier in FM. This function allows visualising frequency peak deviation for FM
carrier signals.
Once this DESV FM measurement mode is activated will appear the following
information on screen:
Page 50
USER'S MANUAL. US TV EXPLORER II
10 20 30
168.25 MHz LEVEL: 78.2
S10 C/N 40.1
» V/A: 16.2
FM DEV: - - -
40
dBµV
dB
dB
kHz
10/2007