BLA703
HF 25—30 MHz Linear Amplifier
Specifications:
Operation Frequency: 25—30 MHz (10m Amateur HF Band)
Modulation Types: SSB,CW,AM, FM, data etc (All narrowband modes)
Transistor: 16x RM 3 MOSFET
Max I/P Current: 10A / 120V. 6A 230/240Vac
Power Supply: 110-120V or 230-240V Model specific
Input Fuse (Internal): 10A or 6A (5x20mm Fast)
Input RF Power: 1-30W max (All modes)
Output RF Power: 550W max
Maximum bypass power (Amplifier off): 50W max
Input VSWR: 1.1—1.5:1
Output VSWR Maximum: 2.5:1
Harmonic Output: >-50dBc 25-30MHz
Dimensions: 410mm x 175mm x 305mm
Weight: 13kg
WARNING: Before using this product please read carefully all of
the information in this manual or at least the quick start guide!!! To avoid dam-
age or incorrect operation this is extremely important!!!
Ver 1.1 Feb. 2024
2
Quick Start Guide:
A more complete guide to the installation is featured later
1. Connect the RTX input connector to transceiver with
50 Ohm patch cable.
2. Connect the ANT Output of the Amplifier to VSWR
Bridge / Wattmeter (If required), and then the ATU (If
required) then the Antenna (50 Ohm load Impedance).
3. Make sure that the amplifier AC switch is switched
off.
4. Connect the Amplifier AC power cable to the AC Net-
work. Pay attention that you have the correct BLA703
model for your countries AC voltage.
5. Adjust the Transceivers RF output power to 10 W
(30W max) if it is capable of more than 30W output
6. Switch on the Amplifier. After a short boot period
press the STB /OPR button until the LED turns green,
‘Operate mode’.
7. Try a brief transmission to check that the antenna
VSWR is acceptable with the amplifier in use. Any
large increase in VSWR indicates that the Antenna is
not suitable for the power being used. Operation
should be halted immediately to avoid damage to the
Amplifier / Radio / ATU etc.
8. If everything is OK you can increase the input drive
and / or change the output power level to suit your
output power requirements.
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