Overview

STAMPFL HAM Electronics VT5-S Active HF Receiver Multicouplers

STAMPFL HAM Electronics VT5-S Active HF Receiver Multicouplers were developed according to a design by Günter Fred Mandel DL4ZAO especially for SWL (Shortwave Listener) covering 9 kHz to 52 MHz. The VT-5S distributes a single near zero-Ohm star point (HF antenna input) to five outputs with a passive distribution network. This decoupling of the individual outputs prevents connected devices from influencing each other without level losses using a low-noise, high-dynamic RF amplifier and a push-pull output stage. These HF Multicouplers ensure high signal stability, minimal self-noise, and strong isolation between outputs. Additional protections include ESD protection on the input and short-circuit protection for the bias-T, which can remotely power active antennas.

The VT5-S Multicoupler is designed to supply an external stabilized DC voltage . With an operating voltage in the range of 11.7 to 15VDC. The DC voltage must be free of hum and noise. The current consumption is approx. 150mA (at 13.8VDC). The DC supply is connected via a center positive 2.1mm ID (5.5mm OD) DC barrel plug. With its compact, lightweight design, the VT5-S delivers reliable performance for professional and hobbyist HF monitoring stations.

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