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VHF 140—150 MHz Linear Amplifier
Specifications:
Operation Frequency:
Modulation Types:
Transistor:
Power Supply:
Input Fuse (Internal):
Input RF Power:
Output RF Power:
Maximum bypass power (Amplifier off): 50W
Input VSWR:
Output VSWR Maximum:
Protection
WARNING:
the information in this manual or at least the quick start guide!!! To avoid dam-
age or incorrect operation this is extremely important!!!
LA 250 / V
140—150 MHz (2m Amateur VHF Band)
SSB,CW,AM, FM, data etc (All narrowband modes)
4x Mitsubishi RD70HVF1
13VDC+/- 1V 40A
3x10A (5x20mm Fast)
1-20W (All modes)
200W @1dB Gain Compression
1.1—1.5:1
2.5:1
Reverse Polarity, High Temperature, Load VSWR
and Excessive I/P power
Before using this product please read carefully all of
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Summary of Contents for RM Italy LA 250/V
- Page 1 LA 250 / V VHF 140—150 MHz Linear Amplifier Specifications: 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:...
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Page 2: Quick Start Guide
Quick Start Guide: A more complete guide to the installation is featured later Connect the input RTX connector to transceiver with 50 Ohm patch cable Connect the ANT Output of the Amplifier to SWR Bridge / Wattmeter (If required), and then the Antenna (50 Ohm load Impedance) Connect the Amplifier DC power Cable to a suitable 13VDC (±... -
Page 3: Front / Rear Panel Description
Front / Rear Panel Description Front Panel LCD Display LCD Backlight control two preset levels AM/FM or SSB operation (Only required if the PTT input is not con- nected) Amplifier ON/OFF switch ON LED TX LED illuminates when amplifier is in transmission Alarm indicator, flash for warning, solid colour for protection Rear Panel RTX SO239 RF input connector (Teflon Insulator) -
Page 4: Installation
Installation: Unpack the amplifier from it’s shipping carton and inspect for any signs of damage. The ampli- fier should be installed (either fixed or mobile installation), in a place that allows good ventila- tion and provides a suitable base to support it. Failure to allow for reasonable ventilation will cause the amplifier to overheat and shutdown prematurely. -
Page 5: Operation
The cross sectional area of the cables used to connect the amplifier to the PSU should not be ² less than 6mm or 10 AWG They should also be kept as short as practicably possible to avoid voltage drop due to ohmic losses. This is less of a problem in a fixed installation where the power supply may be placed close to the amplifier. - Page 6 The protection circuit for excessive input power should not be regarded as a 100% protection for all levels of input power. Up to about 50W the circuit will work very effectively and will save the amplifier from damage, above 50W for example accidental 100W or more applied to the input the protection circuit can not be expected to provide complete protection.
- Page 7 should be less than 1.5:1. Less than 2.0:1 is acceptable but some reduction in power may be seen and the amplifier will work less efficiently and generate more heat. At about 2.0:1 the am- plifier will signal an alarm by flashing the Alarm LED ( front panel) and when the VSWR reaches about 2.5:1 will enter protection, by removing the bias to the transistors and switching the RTX relays to bypass, operation of the amplifier will be blocked.
- Page 8 Protection: Excessive Heat sink temperature: 5 short beeps LED ( front panel) ON LCD “Over Temp” Automatic reset when temperature falls to an acceptable level Excessive Input Power: 5 short beeps Alarm LED ( front panel) ON LCD “Error Power TRX” Manual power reset required Excessive VSWR: 5 short beeps Alarm LED (...
- Page 9 Typical Output Power vs Input Power Pout (W) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Input Power (W) 1dB Gain compression approximately 11.5W I/P 3dB Gain Compression approximately 20W I/P Typical Gain vs Frequency 11W Input Gain (dB) Frequency (MHz)
- Page 12 Warranty: This product is covered by a 24 month warranty commencing from the date of purchase. The original purchase receipt will be required for any claim. This warranty does not cover aesthetic damage or damage to the RF power transistors from incorrect use. www.rmitaly.com e-mail: Info@RMItaly.com...
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