EchoTracer3 — Technical Overview
EchoTracer3 WideBand eProbe (10 kHz – 1.5 GHz)
The EchoTracer3 is a rugged active E-field receive probe (“eProbe”) designed for predictable, linear wideband monitoring. It combines a 1 m whip element in stainless steel or brass — optionally top-loaded with a 15 cm capacitive hat — with a high-impedance wideband RF amplifier, multi-stage protection, selective FM broadcast rejection, and an isolated coax interface.
With the HF-focused whip configuration, EchoTracer3 delivers strong performance from ~10 kHz up to ~200 MHz. For VHF/UHF and monitoring into L-band, EchoTracer3 supports shorter whip options, extending practical coverage to ~1.5 GHz. The useful frequency range always depends on the selected whip.
Core Specifications
| Parameter | Value |
|---|---|
| Frequency Range | ~10 kHz – 1.5 GHz (whip-dependent) |
| Default HF Focus | 1 m whip + optional 15 cm hat: ~10 kHz – 200 MHz |
| Whip Options | 1 m / 75 cm / 50 cm / 25 cm (see recommendations table) |
| Polarization | Vertical (E-field) |
| Strong-Signal Linearity (indicative) | Output P1dB: ~+20 to +22 dBm • OIP3: ~+40 to +44 dBm |
| Broadcast Suppression | Integrated FM broadcast notch (88–108 MHz) |
| Powering | Bias-T over coax, with internal filtering and regulation. Bias-T is available separately and not included. |
| Interface | Low-impedance, isolated coax output with integrated common-mode suppression at the probe |
| Protection | Multi-stage surge and ESD protection at the whip input, active circuitry, and coax interface |
| Power-Off State | The whip is automatically grounded when Bias-T power is removed |
| Important Safety Note | Receive-only device. Integrated protection improves robustness but does not make it lightning-safe — disconnect during thunderstorms. |
Whip Length Recommendations (10 kHz – 1.5 GHz)
| Whip setup | Best use | Trade-off |
|---|---|---|
| 1 m stainless steel + top-loading hat (default) | 10 kHz – 200 MHz (HF focus) | Strongest wideband HF results within the recommended 2–4 m installation range |
| 75 cm | < 400 MHz | Less lower-HF compromise vs 50 cm |
| 50 cm | < 600 MHz | More compromise on lower HF vs 75 cm / 1 m |
| 25 cm | 10 MHz – 1.5 GHz | Best choice when focusing on VHF/UHF up to 1.5 GHz |
For whip-to-mount connections and hardware:
• If you opted for the 1 m stainless-steel whip, use an aluminium anti-corrosion paste for best long-term corrosion resistance.
• If you opted for the brass whip, use a copper anti-corrosion paste to preserve conductivity and reduce oxidation.
How often? Apply once during installation. In harsh coastal or polluted environments, reapply every 2–3 years during inspection, or sooner if you disconnect and reconnect the whip.
Key Design Features
- Multi-stage surge & ESD protection: coordinated protection at the whip input, active circuitry, and coax interface improves robustness while preserving wideband sensitivity.
- FM broadcast notch (88–108 MHz): attenuates strong local FM energy to reduce overload and VHF intermodulation risk.
- Wideband RF amplifier: high-impedance input behaviour and a controlled, low-impedance output support long coax runs.
- Controlled output level: improves matching and limits excessive VHF levels where receiver overload is most likely.
- VHF/UHF response control: frequency-dependent feedback keeps operation above ~100 MHz predictable and linear rather than simply maximizing gain.
- Coax interface noise control: isolated coupling and broadband common-mode suppression help reduce feedline-noise coupling.
- Bias-T power extraction & regulation: internal filtering and voltage regulation improve repeatability across installations.
- Fail-safe whip grounding: removing Bias-T power automatically connects the whip to ground.
When Bias-T power is removed, EchoTracer3 automatically grounds the whip. For stations where receiver protection must follow transmit activity automatically, the complementary RX Disconnect on TX is available separately. It is not included with EchoTracer3.
EchoTracer3 uses a coordinated protection strategy that preserves the high-impedance input and wideband response. Avoiding unnecessary series loss helps maintain sensitivity, matching, and predictable performance across the covered bands while the multi-stage protection system provides practical robustness.
Placement & Grounding (This Matters for Every E-Probe)
- Place it away from local noise: outdoors is best; otherwise at least away from switching power supplies, routers, LED drivers, and house wiring.
- Use a non-metallic mast: plastic or fiberglass is recommended. A practical mast height is ~2–4 m for most installations.
- The coax shield is the reference: an E-probe needs a stable ground reference to convert the local E-field into a voltage. EchoTracer3 intentionally uses the coax shield as its primary reference.
- Ground at the mast base: bond the coax shield to a suitable earth connection at the bottom of the mast, using a short, low-impedance connection.
- Common-mode control: the probe includes common-mode suppression at the interface; in noisy locations, add a high-quality receive-line isolator or choke where needed.
- Clearance: keep at least ~1.5 m from large conductive structures; ~2 m is a good target when possible.
Integrated protection increases robustness, but it does not make any outdoor antenna system lightning-safe. Always disconnect outdoor antennas during thunderstorms.
Recommended Mounting Height
- General starting point: use a non-metallic mast approximately 2–4 m high, with a good ground connection at the mast base.
- HF focus: use the 1 m whip with top-loading hat within this installation range.
- VHF/UHF focus: use the appropriate shorter whip. A clear, low-noise location and controlled feedline currents normally matter more than adding excessive mast height.
Metal roofs or large conductive surfaces can alter both coupling and received noise. Always evaluate the resulting signal-to-noise ratio at your location.
Performance Notes (What to Expect)
- Default configuration is HF-strong: the 1 m whip, optionally hat-loaded, provides higher effective capacitance than a small plate-style probe, typically translating into more usable signal voltage in LF/HF.
- VHF intermodulation risk is actively addressed: FM suppression, controlled output level, and frequency-dependent response shaping help keep behaviour above ~100 MHz more predictable.
- Coverage to 1.5 GHz is whip-dependent: for best VHF/UHF/L-band monitoring, use shorter whips, especially 25 cm, and accept the trade-off of reduced lower-HF performance.
- Install quality matters: the probe can only be as quiet as its reference. Poor grounding and uncontrolled common-mode currents can make any E-probe noisier than it needs to be.
Whip Material Comparison
| Property | Brass | Stainless Steel |
|---|---|---|
| Conductivity | High | Moderate |
| VHF efficiency (practical) | Slightly higher | Reference |
| Corrosion Resistance | Requires periodic care | Marine-grade resistant |
Result: Choose brass when optimizing for maximum weak-signal performance at VHF/UHF; choose stainless steel for long-term outdoor durability with minimal maintenance.
PSKReporter Statistics
Statistics taken on 2025-10-12. The antenna is mounted on a 1.25 m wooden pole in an RFI-infested area, yet still receives remarkably well — even DX on the top bands!
Note: These measurements were made using a WEB-888 SDR receiver, which has limited dynamic range. If performed with a higher-end Airspy or a quality transceiver, the results would typically be even stronger and cleaner across all bands.
160M Top Monitors by Number of Different Countries Reported
80M Top Monitors by Number of Different Countries Reported
60M Top Monitors by Number of Different Countries Reported
Package Contents
- EchoTracer3 module with sealed outdoor enclosure
- Stainless-steel mounting plate
- Selected whip configuration
Complementary products, available separately and not included:
- Bias-T for supplying power through the coax
- RX Disconnect on TX for automatic receiver protection during transmission
- Top-loading capacitive hat, depending on the selected whip configuration
- Ground peg with integrated receive-line isolator
- Low-loss 75 Ω coax and suitable connectors
- Alternative whip lengths (75 cm / 50 cm / 25 cm) depending on target band coverage
Mini FAQ
- Q: Can I monitor up to 1.5 GHz? — A: Yes, with the right whip choice. Use 25 cm when focusing on VHF/UHF/L-band; keep in mind this trades away lower-HF performance.
- Q: Does the FM notch affect 6 m? — A: No. The notch targets the 88–108 MHz broadcast band, well above 50 MHz.
- Q: Is a Bias-T included? — A: No. A Bias-T is required to supply power through the coax and is available separately.
- Q: What happens when Bias-T power is removed? — A: EchoTracer3 automatically grounds the whip.
- Q: How should I protect the receiver in a QRO station? — A: Removing Bias-T power grounds the whip. For automatic protection that follows transmit activity, use the separately available RX Disconnect on TX; it is not included.
- Q: Why does grounding matter so much? — A: E-probes use a reference point, which is provided here by the coax shield. A better, quieter reference, combined with good grounding and common-mode control, usually means better SNR.
- Q: Is the whip material important? — A: Brass can give a small edge at VHF/UHF; stainless steel is tougher outdoors and needs less maintenance.
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