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19" Rack Mountable Analog Simplex Repeater 70cm UHF or 2m VHF
19" Rack Mountable Analog Simplex Repeater 70cm UHF or 2m VHF
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19" Rack Mountable Analog Simplex Repeater
The Analog Repeater Module is a compact, CE-certified transceiver platform for building reliable analog SVXLink simplex repeaters, EchoLink gateways, and analog bridging solutions. Choose between the UHF 70 cm version (400–480 MHz) or the VHF 2 m version (134–174 MHz).
This repeater module uses a Compute Module 4 Lite (Wi-Fi) as the controller and is built inside a 2U 19" rack mountable shielded enclosure. To keep RF where it belongs (and to keep conducted noise out)
* Currently only an SVXLink Bookworm image is available for SVXLink and EchoLink.
What Makes the Repeater Module Different
- Compute Module 4 Lite (Wi-Fi) — higher robustness and a cleaner integrated platform than Pi HAT-style builds.
- External Wi-Fi via RP-SMA — Wi-Fi is routed to an external RP-SMA connector for proper shielding integrity.
- External RF via N connector — VHF/UHF RF is routed to an external N connector for a clean RF interface.
- 500 mW RF output — 28 dBm (~500 mW) for dependable linking and node coverage. (Optional PA is available 30W output)
- Integrated filtering — improved rejection and cleaner spectrum for continuous-duty repeater service.
Specs at a Glance
| Feature | Specification |
|---|---|
| Versions | UHF 70 cm (400–480 MHz) or VHF 2 m (134–174 MHz) |
| RF Output Power | 28 dBm (~500 mW) |
| RX Sensitivity (TX/RX module) | UHF: −109 dBm @ 12 dB SINAD VHF: −104 dBm @ 12 dB SINAD |
| Bandwidth | 12.5 kHz / 25 kHz |
| Clock Stability | 1 ppm KDS TCXO |
| Audio | Wolfson WM8960 ADC / 1 W DAC (48 kHz) |
| Controller | Compute Module 4 Lite (Wi-Fi) |
| RF Connector | External SMA (VHF/UHF) |
| Wi-Fi Connector | External RP-SMA |
| Power & PTT/GPIO Ingress | Filtered via screw-mount feedthrough capacitors (0.001 µF, 500 V, X5U) |
| Compliance | CE Certified (UHF worst-case spurious −86.23 dBc) |
Included with the Product
- Complete assembled and tested device in a precision all-aluminium enclosure
- Preloaded storage with our latest image
- External SMA (VHF/UHF) RF interface and external RP-SMA Wi-Fi interface
- A 2 W terminated indoor antenna (50 Ω) (useful for bench testing / short-range indoor coverage)
Key Features
- All-aluminium, fully shielded enclosure engineered for RF-tight repeater service
- ENIG-finished PCB (Electroless Nickel Immersion Gold)
- Independent TX/RX frequencies, CTCSS, CDCSS
- Adjustable RX/TX gain levels
- Status LEDs: Signal/Tone, TX/PTT
- Ultra-stable 1 ppm TCXO
- Filtered ingress for power and PTT/GPIO using feedthrough capacitors for improved EMC behavior
Power Consumption
- Typical (indicative): ~400 mA RX / ~600 mA TX
Values depend on configuration (Wi-Fi activity, audio levels, CPU load, and duty cycle).
Software - Howto - Instructions
UHF Version Measurements
All measurements in this section apply to the UHF version. VHF measurements follow in the section below.
Sensitivity Measurements
The 12 dB SINAD sensitivity was determined using a 1 kHz tone FM-modulated at a 2.5 kHz deviation and injected into the receiver. This provides an accurate representation of real-world listening performance, aligned with standard SINAD measurement procedures.
Compliance Measurements
All tests conducted with a calibrated Vector Network Analyzer (VNA) and 36 dB attenuator. Worst-case harmonic: −63.56 dBc (3rd), far surpassing ETSI EN 300 220 (≥43 dB below carrier for ≤30 dBm TX). This offers an extra safety margin of >20 dB. Spectrum confirms excellent spurious suppression and clean transmission inside the 12.5 kHz channel.
Compared with top brands like Kenwood, Icom, and Yaesu, our module demonstrates superior spectral purity, placing it on par with commercial-grade equipment.
Spectrum
Harmonics
Channel Power
VHF Version Measurements
Sensitivity Measurements
The 12 dB SINAD sensitivity was determined using a 1 kHz tone FM-modulated at a 2.5 kHz deviation and injected into the receiver. This provides an accurate representation of real-world listening performance.
Compliance Measurements
All measurements conducted with a calibrated Vector Network Analyzer (VNA) and 36 dB attenuator. Worst-case harmonic: −53.07 dBc (2nd harmonic), comfortably exceeding ETSI EN 300 220 CE RED requirements. This provides an extra safety margin of over 10 dB.
The spectrum confirms excellent spurious emission suppression and clean transmission within 12.5 kHz bandwidth. Compared to leading brands (Kenwood, Icom, Yaesu), our module delivers equal or superior spectral purity, placing it in the same performance league as established commercial radios.
Spectrum
Harmonics
Channel Power
Mini-FAQ
- Is it CE certified? — Yes. The hardware meets CE RED requirements and the certificate is available above.
- Which bands are supported? — UHF 70 cm (400–480 MHz) or VHF 2 m (134–174 MHz).
- Output power? — ~28 dBm (~500 mW).
- RF & Wi-Fi connectors? — RF via external N Connector; Wi-Fi via external RP-SMA.
