The LA-250 is a 200W 140-150MHz amplifier, at 1 to 20W input (13.6V 30A). It uses 4 Mitsubishi RD70 Mosfets mounted on a copper heat spreader (200x60x3mm).
It is available in two versions one with and one without top mounted fans. There is an external PTT input but it can be used also without due to the built-in HF-VOX. The front panel features an LCD display which shows input power, output power, heat sink temp and output VSWR. There is the ability to change the intensity of the backlight.
The CPU keeps an eye on input power, temperature and VSWR and will if necessary disable the amplifier from transmitting if there is fault. Any errors will also be recorded and will be available for later recall for diagnostic purposes by either the manufacturer or his distributors.
Weight is approximately 4kg. Dimensions are approximately 240x420x70mm for the non fan version and an extra 10mm of height, 80mm, for the fan version.
Review of LA 250 on eham
VHF 140—150 MHz Linear Amplifier
Operation Frequency: 140—150 MHz (2m Amateur VHF Band)
Modulation Types: SSB,CW,AM, FM, data etc (All narrowband modes)
Transistor: 4x Mitsubishi RD70HVF1
Power Supply: 13VDC+/- 1V 40A
Input Fuse (Internal): 3x10A (5x20mm Fast)
Input RF Power: 1-20W (All modes)
Output RF Power (Nominal): 30 – 210W ; 230W max AM/FM/CW
230W max. AM/FM/CW/SSB Average Power
Maximum bypass power (Amplifier off): 50W
Input VSWR: 1.1—1.5:1
Output VSWR Maximum: 2.8:1
Protection: Reverse Polarity, High Temperature, Load VSWR and Excessive I/P power
This product was added to our catalog on Thursday 09 October, 2014.
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