Specifications

Temperature (Celsius and Fahrenheit scales). You can use them to monitor the technical state of the

amplifier and the associated parameters in digital form.

Selection is made by the PREV and NEXT buttons. You may change them in a closed loop, while the

amplifier is used and controlled in operate and standby modes, changes transmit and receive, without any

influence by the measuring process.

b) You can control LCD adjustment and Auto-Operate feature selection also while "ON LINE". The method is

the same as described for "OFF LINE", so see S.5-1 and S.5-2 for details.

4-5. Auto-Protection System

When any abnormal condition is detected, the amplifier will evaluate the risk and may use three different

degrees of protection, depending on the nature of the problem. Each event is accompanied by a text telling

you the reason. The back-light of the LCD is flashed meanwhile in order to attract the operator's attention.

a) The first degree of protection is issuing a warning message only, without any influence on the transmitting

process. This might be for instance "Reduce Drive", "Plate Current", etc. You could continue to transmit under

such conditions but you are close to a trip threshold.

b) The second degree of protection is a trip in standby mode (Soft Fault). You'll get an appropriate message,

for instance ** GRID CURRENT **. All Soft-Fault messages are marked with two asterisks on both screen

edges. The message remains on the display until you press any button (or Auto-Operate function returns to

operate mode automatically). The Soft Faults are of such kind where you can correct exploitation conditions

operatively (using less drive, improving VSWR, etc).

c) The third degree of protection is a trip in off mode (Auto-Protection).

You'll get the corresponding signature (see S.6-5 - Troubleshooting). If you cannot guess what the reason is,

you may try to turn the amplifier on again in order to check whether it's not an accidental condition. If the

problem persists, you'll need to contact your dealer - see S.1-2.

N O T E

The 6dB input attenuator is automatically inserted about 1 second after a bad tuning is detected at drive

levels above 20W. It is switched off at every PTT release (unless inserted manually).

5. "OFF LINE" OPERATION

There are two control functions and 14 information screens available in this state of the amplifier. You can

control the LCD contrast and back-lighting or enable/disable the Auto-Operate feature. You can also list the

auto - protection signatures. The tube is not powered at all (only the micro-controller is active) during these

operations.

5-1. Contrast and Back-lighting control

Press the PREV+NEXT buttons simultaneously and hold them for two seconds. The back-lighting of the LCD

will light and the "Contrast=... B.Light=..." screen will appear on the bottom line. Control the contrast of the

LCD using the PREV button in steps from 1 to 9. Control the back-lighting of the LCD using the NEXT button

in steps from 1 to 5.

Press shortly the PREV+NEXT buttons in order to reach the Auto-Operate function (see next S.5-2), or leave

buttons unused for 20 seconds if you want to accept these selections only (in order not to change Auto-

Operate inadvertently).

5-2. Auto-Operate enabling and disabling

When enabled, this function will save manual actions and operating time for you. It will automatically execute

operate commands every time when needed. The OPER button will be still functional, so you'll be able to

change to standby and back to operate manually at any time. After returning to operate the first time (by

pressing OPER button again), the Auto-Operate feature will be restored.