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RM Italy VLA 200 - User Manual

RM Italy VLA 200
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AMPLIFICATORE LINEARE VHF
VHF LINEAR AMPLIFIER
AMPLIFICATEUR LINEAIRE VHF
VHF LINEARVERSTÄRKER
AMPLIFICADORES LINEAL VHF
Mod. VLA 200
This is to certify that:
The linear amplifier Mod VLA 200
complies with the provisions of the Directive of the Council of the European Communities on the approxi-
mation of the laws of the Member States relating to electromagnetic compatibility (EMC Directive 89/336/
EEC).
This declaration of conformity of European Communities is the result of an examination carried out by the
Quality Assurance Department of
RM Costruzioni elettroniche
in accordance with European Telecommunicatons Standards ETS 300 684 - 300 339, of December 1995.
Interruttore SSB FM - SSB FM switch - Interrupteur SSB FM -
Betriebsartenschalter SSB FM - Interruptor SSB FM
Interruttore ON OFF preamplificatore - Preamplifier ON OFF switch -
Interrupteur ON OFF preamplificateur - Schalter ON-OFF EIN-AUS für
Vorverstärker- Interruptor ON OFF del preamlificador
Interruttore ON OFF lineare - Amplifier ON OFF switch -Interrupteur
ON OFF amplificateur - Schalter ON-OFF EIN-AUS für
Linearverstärker- Interruptor ON OFF del amplificador
Indicatore potenza d'uscita - output power meter - Indicateur de
puissance de sortie - Betriebsspannung -Indicador de potencia de salida
Led indicatore di trasmissione - Transmission led indicator - Led
indicateur de trasmission - Sende LED - Led indicador de tasmisión.
Led indicatore di accensione preamplificatore - Preamplifier switching
on led indicator - Led indicateur d'allumage du preamplificateur -
Eingangsverstärker schaltbar, LED Anzeige - Led indicador de
encendido del preamplificador.
Led indicatore di accensione lineare - Amplifier switching on led
indicator - Led indicateur d'allumage de l'amplicateur - Verstärker
LED Anzeige - Led indicador de encendido del amplificador.
Indicatore di stato di protezione - Protection state indicator - Indicateur
de protection - Überlastungschutz LED - Indicador de protección
Warning
Protection
OUTPUT POWER
VLA 200
VHF Linear Amplifier
FM
SSB
Lin
ON
Pre
ON
TX

ITALY
EC Certificate of conformity
(to EMC Directive 89/336/EEC)
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Question and Answer IconNeed help?

Do you have a question about the RM Italy VLA 200 and is the answer not in the manual?

Overview

The VLA 200 is a VHF linear amplifier designed to enhance radio frequency signals. It is certified to comply with the provisions of the European Communities' EMC Directive 89/336/EEC, as confirmed by RM Costruzioni elettroniche in accordance with European Telecommunications Standards ETS 300 684-300 339, dated December 1995.

Function Description:

The VLA 200 serves as a VHF linear amplifier, capable of amplifying signals within the 144-148 MHz frequency range. It features an electronic switch for operation and includes protection mechanisms against polarity inversion and excessive Standing Wave Ratio (SWR). The amplifier can operate in both FM and SSB modes, making it versatile for various communication needs. It also incorporates a preamplifier with an ON/OFF switch to boost weak incoming signals.

Important Technical Specifications:

  • Frequency Range: 144-148 MHz
  • Supply Voltage: 12-14 Volts DC
  • Current Consumption: 12-22 Amps
  • Input Power: 1-50 Watts
  • Output Power: 60-200 Watts
  • Input SWR (ROS ingresso): 1.1 - 1.5
  • Operating Modes: FM, SSB
  • Preamplifier Gain: 15-25 dB
  • Fuses: 2 x 12 A

The device includes several indicators:

  • Output Power Meter: Displays the power output.
  • Transmission LED Indicator: Illuminates during transmission.
  • Preamplifier ON LED Indicator: Shows when the preamplifier is active.
  • Amplifier ON LED Indicator: Shows when the linear amplifier is active.
  • Protection State Indicator (Warning LED): Illuminates to indicate an active protection mechanism, typically due to excessive SWR.

Usage Features:

For optimal performance and longevity, the VLA 200 should be positioned to ensure adequate airflow to its heat radiator. Power supply cables should be as short as possible, not exceeding 3 meters, and ideally connected directly to the battery with a minimum cross-section of 4 mm².

The 50 Ω antenna cable should be of high quality, suitable for the operating frequency and power. Its length should be minimized to prevent significant attenuation during transmission, which can lead to power loss and a degraded signal-to-noise ratio during reception. The antenna used should be capable of handling the amplifier's power and maintain an SWR not exceeding 1.5 at maximum power. High-quality Teflon connectors are recommended for all connections.

The connection between the transceiver (RTX) and the amplifier should be made with a 50 Ω cable, with a recommended length of approximately ½λ x 0.66. The VLA 200 is equipped with a PTT (Push-To-Talk) command that allows direct RX-TX switching from the transceiver, which is particularly useful for SSB, CW, and Packet modes as it significantly reduces switching times. When using this PTT connection, the mode switch should be set to FM.

It is advised not to remain in transmission for extended periods without reasonable cooling intervals for the transistors. For base station use, it is recommended to use a battery with a buffer charger.

Maintenance Features:

The device is protected against polarity inversion and excessive SWR. If the protection state indicator (Warning LED) illuminates, it signifies an intervention of the protection circuit due to an excessive SWR level. To restore the amplifier's functionality, turn the amplifier OFF and then ON again after resolving the cause of the protection activation (e.g., correcting the antenna SWR).

The VLA 200 comes with a 24-month warranty from the date of purchase. However, it is crucial to note that the warranty does not cover final transistors or aesthetic parts, and it is void if the instructions are not observed. The manufacturer emphasizes that the use of linear amplifiers is subject to specific laws, and users are responsible for knowing and complying with these regulations. The manufacturer disclaims any responsibility for incorrect use.

RM Italy VLA 200 Specifications

General IconGeneral
BrandRM Italy
ModelVLA 200
CategoryAmplifier
LanguageEnglish

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