• Compact plastic Bias-T module, designed for powering the EchoTracer active wideband E-probe via coaxial cable.
  • SMA to BNC coaxial cable for connecting the EchoTracer active E-probe to receivers or other RF equipment.
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RF Guru

Bias-T 75Ω 10 KHz - 1.5 GHz

Bias-T 75Ω 10 KHz - 1.5 GHz

€39,00 EUR
€39,00 EUR
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Version
Handmade in Belgium. Fulfilment times may vary with order volume. Please allow 2–3 weeks for assembly and shipping.

Our RF.Guru Bias-T family lets you feed DC power over coax to an active receive antenna, LNA, or preamp while keeping your receiver port DC-free. These Bias-T units are designed around a practical real-world setup: 75 Ω coax + F-connectors on the feedline/antenna side, with a clean 50 Ω SMA output toward your SDR/receiver.

What a Bias-T does (in plain terms)
• The coax port to the antenna carries RF + DC on the same cable.
• The receiver port passes RF only (DC is blocked).
• The power port injects DC through a filtered feed so your supply noise doesn’t ride along as “fake RF”. Tip: A Bias-T is for receive chains. Do not transmit through it.

Choose Your Bias-T Model

We offer three ranges. Pick the one that matches your highest frequency needs (and your lowest frequency needs).

Model Frequency Range Best For Key Note
Bias-T 200 10 kHz → 200 MHz LF/HF + VHF (160 m through 2 m) Uses a 75→50 Ω transformer with 200 MHz max.
Bias-T 600 10 kHz → 600 MHz LF/HF + VHF + UHF scanning (up to 70 cm and beyond) Discrete wideband Bias-T network + 75→50 Ω transformer.
Bias-T 1500 10 MHz → 1.5 GHz VHF/UHF/L-band (incl. 70 cm, 23 cm, ADS-B @ 1090 MHz) Starts at 10 MHz (not for LF/HF below that).

Connectors & Typical Wiring

  • Coax to antenna (RF + DC): F-connector (75 Ω)
  • Receiver output (RF only): SMA female (50 Ω)
  • DC input: Powerpole (typical ham shack 13.8 V supply)
Recommended Hook-Up
1) Connect your 13.8 V DC supply to the Bias-T power input.
2) Run 75 Ω coax from the Bias-T F-port to the active antenna/LNA.
3) Use a short jumper from the Bias-T SMA output to your SDR/receiver.
For best noise performance: keep DC leads short and add a clip-on ferrite on the DC cable near the Bias-T.

Why 75 Ω on the feedline/antenna Side?

In receive systems, 75 Ω coax is often the best value: low loss at VHF/UHF, good shielding, and easy outdoor connectorization with F-connectors. Your receiver is typically 50 Ω, so we use a 75→50 Ω transformer on the RF output to keep the interface clean and predictable.

Noise & Protection Done Right

  • Multi-stage DC filtering: a filtered DC feed reduces the chance that your power supply noise becomes “RF”.
  • Reverse-polarity protection and a resettable fuse help avoid “oops” moments in the shack.
  • Static bleed / ESD handling: the coax line includes a high-value discharge path and clamping elements to reduce static build-up.

A Bias-T is not a lightning arrestor. Use proper grounding and surge protection practices for outdoor installations.

Model Details

Bias-T 200 (10 kHz → 200 MHz)

The go-to option for LF/HF receive and VHF up to 2 m. This model uses a 75→50 Ω transformer that is intentionally limited to 200 MHz, which keeps performance solid where it matters for LF/HF work.

Use this if you primarily care about:
• 10 kHz–30 MHz (LF/HF SDR work, wideband active antennas)
• HF through 2 m receive coverage
If you want strong UHF coverage (433 MHz / 70 cm), choose Bias-T 600 or Bias-T 1500.

Bias-T 600 (10 kHz → 600 MHz)

Our wideband “do-most-things” Bias-T: it covers LF through UHF while keeping the DC feed clean through a discrete multi-stage network. It’s ideal for active antennas like EchoTracer-class E-probes that are used from HF up into VHF/UHF monitoring.

Bias-T 1500 (10 MHz → 1.5 GHz)

Built for higher-frequency receive chains where layout parasitics matter: VHF/UHF and L-band scanning, including 23 cm and ADS-B (1090 MHz). This model starts at 10 MHz, so it’s not intended for LF/HF work below that threshold.

Included

  • RF.Guru Bias-T (selected model)
  • Powerpole DC input with power LED
  • F-connector antenna port (RF + DC over 75 Ω coax)
  • SMA female receiver port (RF only, 50 Ω)
  • Short SMA-to-BNC jumper

Specs at a Glance

Parameter Value
Available Frequency Ranges 10 kHz–200 MHz / 10 kHz–600 MHz / 10 MHz–1.5 GHz
Antenna/Coax Port F-connector (75 Ω, RF + DC)
Receiver Port SMA female (50 Ω, RF only)
DC Input Powerpole (typical 13.8 V shack supply)
Protection Reverse polarity + resettable fuse + static/ESD handling

Power your device within its rated voltage/current. If you’re feeding a 5 V LNA, use a regulated 5 V supply; if you’re feeding ham-grade active antennas, 13.8 V is typical.

Mini-FAQ

  • Can I transmit through this Bias-T? ... No. These are intended for receive chains (active RX antennas / LNAs / SDR setups).
  • Which model should I pick? ... Choose based on your highest and lowest frequency needs: HF-focused = Bias-T 200, wideband to UHF = Bias-T 600, VHF/UHF/L-band = Bias-T 1500.
  • Do I have to use 75 Ω coax? ... It’s recommended for cost and loss, but many receive setups will still work fine with 50 Ω coax. The receiver side remains 50 Ω on SMA.
  • Will a noisy power supply ruin my receive noise floor? ... It can. We add multi-stage filtering, but a very noisy supply can still leak in. Use a decent supply and add a ferrite on the DC lead.
  • Is this lightning protection? ... No. Use proper grounding and surge protection for outdoor coax runs.

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Questions or experiences to share? Feel free to contact RF.Guru about Bias-T selection and installation.

 

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