Warning; Display Lcd; Ssb/Off; Front Panel Led's - RM Italy HLA 305 User Manual

The display shows the current operating parameters.

17.4.2.1 Display LCD

The first row indicates the state of the amplifier and the if the filter
choice is in manual or automatic mode.
The second row displays the temperature of the heat sink and the cur-
rent selected output filter.

17.4.2.2 Front panel LED's

17.4.2.2.1 TX ( )
Illuminates red when the amplifier is in transmission. A
small delay is normal for the LED, however this does not effect
the switching time of the relay.
17.4.2.2.2

WARNING ( )

Illuminates red indicating a problem with the amplifier, the de-
scription of the error is displayed on the LCD.
17.4.3 Controls
The front panel features several user controls. These should only be
operated when the amplifier is not in transmission.

17.4.3.1 SSB/Off ( )

When active adds a small delay (Adjustable) for the drop out
time of the TX relay before switching back to receive. When
inserted an 'S' is displayed at the first character of the second
row. This should only be required in SSB or CW modes if the
PTT input connector is not utilised.

17.4.3.2 Hi/Off (

This switch allows manual insertion of the input attenuator in
order to reduce the output power. When set to OFF an 'H' is
displayed on the display (second character of the second row).

17.4.3.5 Power ON/OFF (

Main On / Off power switch.

18. Protection

The HLA305 features several protection circuits that will interrupt opera-
tion if necessary in order to protect the amplifier from damage. These
are controlled by a microprocessor that can identify all possible fault
conditions and alert the operator with both an audible error tone and an
error message on the LCD display. If necessary the protection circuits
will shut down the amplifier and return the amplifier to Standby. In this
case it will be necessary to eliminate the cause of the problem and reset
the amplifier by switching the Power switch off and on. ( ).
Despite sophisticated protection, operating the amplifier repeated-
ly after an error has been reported without any correction may
cause permanent damage. The use of an incorrect band filter or
transmitting without a suitable antenna connected to the amplifier
at maximum power may cause irreversible damage.

18.1 Excessive Input Power

If the input power from the transceiver exceeds 10W
the input attenuator is automatically inserted and the
Display shows Power TRX >10W , when the input
power increases above 15W, the red
will illuminate ( ) and the display shows: Power TRX
>15W the amplifier will be shut down, an audible error
Nr Protec on
1
Input Power >10W
2
Over Input Power
3
Input Power >15W
4
Over Temp Temperature >56°C
5
Over SWR Antenna SWR >3,0:1
6
Filter Fault
Frequency out of
7
Frequency <1,5 o >30 MHz
range
warning LED
Cause
Power TRX > 10W
Error power TRX
Error SWR >3.0
Low efficiency
Err Power Filt.
Error Frequency
tone will be emitted and the
illuminated. In this case the LCD will show: Error
Power TRX. It will then be necessary to restart the
amplifier by switching the amplifier off and then back on
to reset the protection.
18.2 OVER Temp.
The temperature at the point of contact between the
transistors and the heat sink regulates the speed of the
heat sink cooling fan (only HLA305V). If the tempera-
ture is below 37°C the fans rotate at minimum speed,
between 38 and 49°C medium speed , between 50 and
54 °C at maximum speed. Above 55°C the speed is
maximum and the
both models, above 56 °C the amplifier will shut down,
the audible warning will continue and the
LED will remain illuminated. The amplifier will return to
normal operation when the temperature drops below
51°C. In this case the LCD Display will show:
OVER TEMP! on the first row and display the current
temperature on the second row.

18.3 Excessive VSWR

A sensor positioned after the Low Pass Filter section
measures the level of forward and reflected power on
the antenna. The microprocessor calculates the VSWR
and is used to protect the amplifier from excessive dissi-
pation from reflected power. The amplifier operates at
it's best when the VSWR is below 2.0:1. Above 3.0:1 an
audible error tone will be emitted and the
warning LED will illuminate, the amplifier will also be
shut down. The audible warning will continue and the
warning LED will remain on. To reset the amplifier it will
be necessary to switch the amplifier off and back on. In
this case the LCD display will show: ERROR SWR >3.0
on the first row.

18.4 FILTER FAULT

The band pass filter selection is controlled and moni-
tored by the microprocessor in order to verify that the
correct filter is selected. If the current filter is incorrect or
has a problem during use the processor will signal an
error. If the filter selection is incorrect or that there is a
problem between the amplifier and antenna, the opera-
tion of the amplifier is outside of its safety limits and will
sound the audible alarm and illuminate the
warning LED. The LCD will display: Err Power Filt.

18.5 Error Frequency

If the input frequency is outside of the specified limits,
the amplifier will shut down , an audible tone will be
emitted and the LCD will display 'Error Frequency'
Display Reset
No ac on
Switch Off amplifier
OVER Temp! Automa c >51°C
Switch Off amplifier
Switch Off amplifier
Switch Off amplifier
warning LED will remain
warning LED illuminates ( ). For
19. Warranty
Led Note
*
Reduce transmi er power
Check ven la on of amplifier
Check antenna tuning/fault
Incorrect Filter o Antenna Fault
Controllare la frequenza di trasmis-
sione
HLA 305
warning
( par.4)
( par.4)
*LED Flashing
11