MT-MR PLATINUM. POINT TO POINT AURAL RADIO RELAY SYSTEM
23
This is a three-digit password and arrangements can be made to be known only by authorized personnel, in order
to avoid any non-authorized tampering or alteration of its nominal value. However, some routine measurements can
be taken from Digital Display via Microcontroller unit without knowing of such password.
Transmitter
is
fitted
with
a
10
watts,
broadband
-
tuned,
RF
Power Amplifier whose active amplifier element,
generally an RF Power Amplifier Integrated Circuit, changes according to the frequency band selected. There are
several types of power amplifiers, including some having a Power Transistor as amplifier element, but all of them
has the same power level of 10 watts in their respective working frequency band.
3.2.- Transmitter Technical Specifications.
R.F. Power output .................................................................................................................................. 10 watts pep.
R.F. Output Connector .................................................................................................................................. N female.
R.F. Output Impedance ............................................................................................................. 50 ohms, unbalanced.
Working Frequency Range ............................................................................. 200 to 980 MHz, in 20 MHz sub-bands.
Harmonic Supression .................................................................................................................................... > 55 dBc.
Modulation ........................................................................................................................... FM, F3 direct over carrier.
a)Measurements in Monaural Mode:
Signal to Noise Ratio.......................... ............................................................................................................ > 60 dB.
Conditions: ±75 KHz carrier deviation with 400 Hz tone.
Measured in 30 Hz - 20 KHz band.
Harmonic Distortion........................... ............................................................................................................. < 0.07%.
Pre-emphasis........................... ............................................................................................ 50 or 75 usec. selectable.
Audio Frequency Response. ............................................................................. ± 0.5 dB within 30 Hz - 15 KHz band.
Audio Input Level......................................................................... Adjustable. 0 dBm. nominal for ±75 KHz deviation.
Audio Input Impedance. ............................................................................ 10 Kohms balanced. XLR input connector.
b) Measurements in Stereophonic Mode:
Baseband Input Impedance .............................................................. 10 Kohms unbalanced. BNC Female connector.
Total Harmonic Distortion .............................................................................................................................. < 0.27 %.
Baseband Signal to Noise Ratio .................................................................................................................... > 67 dB.
Conditions: 400 Hz tone measured in 30-20,000 Hz band.
