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 high isolation between outputs. Additional protections include ESD protection on the input and short-circuit protection for the bias-T, which can also remotely power active antennas.

The VT5-S Multicouplers are 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.

Note: There is no need to terminate "open" outputs with 50 ohms.

Specifications

- Frequency Range: 9kHz – 52MHz

- Frequency Response:

• 50MHz -2dB

• 24MHz -1dB

• 5.0MHz 0dB

• 1.0MHz 0dB

- IP2: 72dBm, Each +4dBm (+10dBm pep) with 6.0MHz/ 7.0MHz

- IP3:

• 1.0MHz +38dBm

• 10MHz+33dBm

• 30 MHz+18dBm

• +4dBm (+10dBm pep) Spacing 10kHz

- Reverse Isolation: 0-50MHz >90dB, It is even and very high.

- 1dB Compression Point: Up to +10dBm output power not yet reached (10MHz).

- Noise Figure: 6dB

- VSWR / Reflection Attenuation, Input:

• 50MHz 1.22/20dB

• 24MHz 1.21/20dB

• 5.0MHz 1.15/23dB

• 1.0MHz 1.10/26dB

- VSWR / Reflection Attenuation, Outputs:

• 50MHz 1.26/18dB

• 24MHz 1.14/23dB

• 5.0MHz 1.04/33dB

• 1.0MHz 1.02/37dB

- Harmonic f2: Measuring Transmitter HP8640, Input 14.0MHz / 0dBm f2 -62 dBc Distance. (The 62dB gap does not deteriorate by looping in VT-5S.)

- Outputs: 5 SMA ports, isolated

- Inputs: 1 BNC port

- Input Protection: ESD surge protection

- Bias-T: Remote switchable, short-circuit protected

- Power Supply: 11.7–15VDC (stabilized), approx. 150mA at 13.8VDC

- Power Connector: 5.5/2.1mm DC barrel plug, center positive

- Dimensions: (WxHxD)5.24 x 3.43 x 0.98in. (133 × 87 × 25mm)

- Weight: 0.34lbs.(153g)