INTRODUCTION
Thanks for the preference granted us in the purchase of our solid state HF/VHF linear amplifier
model HVLA700M (in succession called amplifier). The professional construction, the use of selected and
oversized components and the technical solutions adopted make it a high quality product, accurate and reliable
during the time. We recommend a suitable use of this amplifier and only for high distance links.
Finally, we advise to read this manual before operating this equipment.
This manual may be subject to changes and updates.
GENERAL DESCRIPTION
The amplifier covers all the amatorial bands from 1.8 MHz to 54 MHz and all the operative modes. Its
peculiarities can be summed up in: no warm-up, no tuning operations, low consumption, noiseless and
lightweight. It can be piloted by every type of transceiver (also vintage). The absence of a software does not
diminish the quality of the amplifier, on the contrary, it protects it from all the problems due to the software
time response, however short they are, are sometimes source of serious damage.
It is composed by these circuits:
-Activ input match/attenuator able to match perfectly the output impedance of the transceiver with the
input impedance of the amplifier and to protect, in a very effective way, the amps in case you exceed the drive
power.
-Power amplifier stage push-pull AB class type composed by 4 X VRF151 RF Power Vertical Mosfets chosen
for their robustness, resistant to high impedance mismatches and low Intermodulation Distortion (IMD).
-Output filters it is the only amplifier, built with high quality components planned for having an high
suppression of the unwanted emissions (harmonics and spurious frequencies).
-ALC circuit essential for reduce the drive power level in the case the output power of the amplifier get to
values that produce distortion. It works also when we are in the presence of an excessive level of antenna
SWR.
-Protections that, thanks to the high quality of the “directional couplers” used, protect the amplifier in case of
wrong change of the filter band, excessive VSWR, open antenna and short circuit antenna. The temperature
sensors preserve the RF power Mosfets from excessive thermic stress and “shift” in the working class of the
amplifier.
-Power supply of switching type, oversized, no “noise” and equipped with “Power Factor Corrector” circuit
according to the new European Rules on energetic efficiency.
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