R.V.R. Elettronica TEX20-NV, Техническое руководство

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TEX20-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 36
6) Switch the power switch to the ON position and check that the both
green voltages presence leds (2 Fig.1A and 1B) and the red UNLOCK
led (12 Fig.1A and 7 Fig.1B) are both ON.
Select the desired operating frequency using the corresponding
selector (8 Fig.1A and 6 Fig.1B).
The red UNLOCK led should switch off within 30 seconds, indicating
that the oscillator has locked onto the operating frequency.
The frequency selector comprises five figures of which the three
to the left of the decimal point represent (from left to right)
hundreds of MHz, tens of MHz and MHz. The two figures to the right of
the decimal point represent (from left to right) hundreds of KHz
and tens of KHz.
Eg: 098.45 = ninety eight megahertz and four hundred and fifty
Kilohertz.
Eg: 103.94 = one hundred and three Megahertz and nine hundred and
forty Kilohertz.
Furthermore, if a frequency is selected beyond the two limits of
the 87.5-108MHz band, the amplifier will continue to work even though
the displayed frequency no longer corresponds to the operating
frequency of the unit.
N.B. Transmitting outside the legal band (87.5-108 MHz) is an
offence and may lead to prosecution.
7) After having verified that the UNLOCK led (12 Fig.1A and 7 Fig.1B)
is switched off and that the unit is therefore locked to the selected
operating frequency, switch the switch connected to the INTERLOCK
connector so as to remove the short circuit between the central
conductor and ground. The RF output is now enabled and should corre-
spond to a power level of about 2W.
To check this reading, select PWR on the PWR/DEV selector (10 Fig.1A
and 3 Fig.1B) and FWD on the FWD/REF (11 Fig.1A and 5 Fig.1B), and
then read the power on the 50W FSD scale.
8) Using a small screwdriver, rotate the PWR ADJ control clockwise;
the power output should increase progressively to a maximum of 20W.
Check the value with the bypass wattmeter which should be within
±10%.
9) With the power output at 20W, select a new operating frequency well
away from the current value.
Eg: 107 MHz: the UNLOCK led should switch on and the power output
should fall to zero at the same time. Only when the UNLOCK led
switches off (unit locked to new frequency) should the power output
resume its previous level.
Automatic power control check