Precautions - JRC JRL-2000F Manual

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BASIC OPERATION
6
6.8 Precautions
The JRL-2000F is equipped with apower amplifier with low IMD characteristics and high linearity,
and a power supply unit with a high power margin. The amplifier is designed to generate
and output signals of high quality and stability.
However, failure to use the JRL-2000F correctly may result in reduced performance such as
poor sound quality or radio interference. Therefore, special attention should be paid to the
following points during transmission:
Frequency display
Always verify that the frequency band indicated in the amplifier's central display matches the
exciter's transmission frequency.
I
MATCH
I LED color
Du ring transmission, the
I
MATCH
I
LED should be green in color. lf the color is orange or red,
proper antenna matehing has not been achieved. ln this case, you must implement the automatic
tuning operation as described in section 6.3.
I
DRIVE
I
LED color
Du ring transmission, the
I
DRIVE
I
LED should also be green in color. lf it is orange in SSB
mode, it indicates that the APC (Automatie Power Control) circuit inside the JRL-2000F has
been activated due to over-excitation.
Even when the ALC Ievei has been correctly adjusted, the amplifier's APC circuit may be activated
if the power control or microphone gain on the exciter or the gain on the speech processor
is too high. in this case, turn the power control or reduce mic gain until the DRIVE LED is
lit green.
Meters
The two meters should be checked regularly during transmission tö verify that the JRL-2000F
is operating normally.
• Check that the peak Po value is not over 1000 watts.
• Check if the antenna VSWR is abnorr.nally high.
• Check that the Vo voltage is set at about 80-85 V.
• Check that the lo current is set at the correct value. When the continuous output power
is 1000 watts, the lo value should be approximately 22-27 A (input 1760-2160 W).
lf the meter values are different from their normal readings, one of the causes may be a change
in antenna impedance. ln such cases, try matehing again with the automatic tuning operation.
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