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3/a FRONT PANEL
1.
POWER ON
Main switch of the equipment is on the power supply (ME3000-S).
2. ON LED
The LED indicator glows when the Linear is switched on. Doesn't lit in case the
15V DC – supply for the protection circuits and antenna switch - is missing.
3. OVR LED
The blinking LED indicates the active stage of the protection circuit. The
protection might be active du to overdrive, IG1 higher as specified, SWR > 3,
or any other case. (See specifications)
If the protection is active, the TCVR power by-pass the PA. To reset the
protection release the STBY button, than push it again. The reason of the
trouble has to be cleared first.
4.
AIR LED
The indicator glows while transmitting and the T/R relay is switched on.
Without driving power the PLATE meter indicates the base current of the PA.
5.
OPR LED
Glows when the PA is ready for transmission. During heating up period, when
the LED doesn't lit, the driving is blocked. The stby time is about 120 sec.
6.
WAIT LED
Blinking during the heating up period, indicating that the heating is in
progress. Required time is abt. 120 sec, when the light goes out and the OPR
led lit up.
7.
QRO LED
Indicates the high power mode of the PA. Can be activated by the push-
button below. In case the mode is not active, only the TCVR power is on the
aerial. (Small PWR STBY mode)
8.
Ua PUSHBUTTON
Selects the anode voltage (kV) indication on the POWER meter using the
PLATE scale. There is only one way selection between Ua - Ig2 pushbuttons.
9.
Ig1
The current of the grid (Ig1) can be checked. Current limit is 350 mA, when the
protection is activated.
6
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