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2 OPERATION
2.5. ELECTRONIC BIAS SYSTEM (EBS) only ALPIN 100 MK II
The amplifier has an integrated EBS which can be activated and deactivated after switching
on. The buttons UP and DOWN have to be pressed down while pressing the LINE switch on
the backside.
After this the display will show the message "EBS is on" or "EBS is off". The status can be
changed by doing this procedure again. The default configuration is an activated EBS.
2.6. TUNING PROCEDURE
Below, you can find a step-by-step description of the tuning procedure. It may vary from one
band to another, but these are the basic things to do. For a better and faster tuning use the tune
table in the following section to find a rough starting point.
Before tuning decrease the drive power to approximately 20W
to avoid damages! After you have found the correct tuning,
1) Set the Amplifier to the desired band with the BAND SWITCH on the left of the front
panel. Never change the position of the BAND SWITCH while transmitting!
2) Apply approximately 20W of drive power to the amplifier.
3) Tune the LOAD KNOB on the front panel while observing the CAP tune meter on the
LCD display. Turn the knob into the direction of the arrows of the CAP tune meter.
Please use the tune table in the next chapter for the first configuration of TUNE and
LOAD KNOBs.
4) Now we have to turn the TUNE KNOB on the front panel to the maximum reading of
the FORWARD POWER in the display. While tuning it is possible that the built- in
INPUT ATTENUATOR is activated and the ATT LED will light. Don't care about that
and try to find the optimum position for LOAD and TUNE. After releasing the PTT
and pressing it again the INPUT ATTENUATOR will be deactivated again (when
tuning is good) and in the next step some fine tuning can be done.
5) After readjusting the transceiver output power a slight retune could be necessary and
steps 4) and 5) have to be repeated.
ALPIN100 Manual © Copyright 2008 by Reimesch Kommunikationssysteme GmbH
!!! ATTENTION !!!
you may increase the drive power.
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