Youloop Balun Box with Preamp | Youloop Amplifier with WideBand Ultra-low Noise Bias-T | Youloop Upgrade

The youloop is of magics for all shortwave listening. It is a simple and quiet antenna of high performance, whatever the official youloop or even your diy ones. It is a quiet passive antenna, so we get a chance to add an amplifier for amplifying the weak signals. The balun box introduced here integrates a high performance preamp with a relay to control the amplifier’s ON and OFF. The amplifier is powered through Bias-T with a DC-12V. When the applied dc is OFF, the amplifier is shut down and the RF signals will bypass the amplifier and feed to the coax directly. In this case, the youloop is in passive mode and the performance is equal to your original youloop without an amplifier. When the balun box is in active mode, the RF signal is amplified by its internal amplifier and then fed to coax.

The balun box is able to replace your original balun box directly. The balun box is built in a black box of weather proof. However, when it is installed outdoors, the SMA connectors should be protected from water with waterproof tape.

A wideband Bias-T of low nosie is provided to power the unit up. Unlike other Bias-T used in HF, the DC voltage from the Bias-T here comes from a LT-3042, which is a ultra low noise linear regulator. An filter consisting of resistors, inductors and capacitors is also added on the DC output stage in order to filter the noises out. The output voltage on Bias-T is set by jumpers on the board, which provides 3.3V, 5V and 12V output, and the maximum current output is 200mA. If you have your own Bias-T at hand, do not forget to set your Bias-T to 12V output.

Features:

1. Replace your old balun box directly, no modifications needed.
2. Passive (Bypass) or active selectable.
3. The final output could be attenuated by the potentiometer (ATT).
4. Could be powered with our Wideband Low Noise Bias-T or the Bias-T you’ve already had.

Specification (Balun Box):

1. Working Frequency: 0.1MHz – 30MHz
2. Working Voltage: 12V
3. Working Current: 70mA
4. Gain: 18dB (Typical)
5. Intercept Point: 15dBm(IN), 33dBm(OUT) @14MHz
6. Insertion Loss: <0.5dB(Max@150MHz in Bypass Mode)
7. Dimension: 83x56x33(mm)
8. Weight: 83g

Specification (Bias-T):

1. Working Frequency: 0.1MHz – 1GHz
2. Insertion Loss: <0.3dB
3. Returnloss: > 27dB (Average)
4. Impedance: 50 ohm
5. Working Voltage: 5-16V (IN), 3.3V, 5V, 12V (OUT)
6. Working Current: 200mA (Max)
7. Dimension: 45x54x19(mm)
8. Weight: 37g

Shipping List:

1. Youloop Balun Box with Preamp X 1 (Option 1, No Youloop Included)
2. Low Noise Bias-T X 1 (Option 2, No Amplifier Included)