Output level adjustment allows to match the signal to other signals within the installation, also concerning other modulators connected in cascade.
50 kHz is the standard deviation for input audio signal of 0.775 V RMS. The adjustment of deviation ensures similar deviation for a little different audio levels. The standard deviation can be obtained within the range of 0.150-0.775 V . Correct adjustment is essential for equal volume levels on individual TV channels.
The standard depth of video modulation is 75%, however sometimes it can be useful to change it a little, e.g. when the source generates alphanumeric characters a bit exceeding proper limit. The possibility of setting video modulation factor within +/-6% enables correction in such cases, optimizing the signal quality. In practice it is seen as little change of brightness and contrast of the picture, e.g. of that characters. Generally, when the original and converted (by the modulator) picture has regular quality (no overmodulation), and sound is clear as well - no correction is needed.
Changing a little output frequency one may attempt to eliminate interferences coming from neighboring channels, when they are fixed in the system. Making offset of the output modulator's frequency there is a chance to solve that problem. The possible range is +/-2.5 MHz at 250 kHz intervals. Generally, when the signals within installation are of good quality, that feature is not used.
two standards (B/G & D/K),
PLL synthesis,
protection against tampering,
DSB-type,
RF loop,
F-type connectors (output, input) and RCA sockets (audio & video inputs).
Price: 44.67 EUR
Technical specification:
Specifications
MT-27P
Inputs
1
Frequency range
channels
1-69 & S9-S17
MHz
48-862
Video carrier offset MHz +/-2.25 with 0.25 step
Output level
dBuV
85
Sound subcarrier MHz 6.5 (D/K) / 5.5 (B/G)
Power
230V/ 50 Hz / 3VA
Operating temperature
ºC
-10 to +50
Dimensions
mm
118x78x47
Weight
kg
0.33
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