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RF Guru

2023-K-041-U | Kit - SVXLink Analog HotSPOT 70cm UHF 500mW

2023-K-041-U | Kit - SVXLink Analog HotSPOT 70cm UHF 500mW

Regular price €121,05 EUR
Regular price Sale price €121,05 EUR
Sale Sold out
Tax included.


Included: our enclosure, a Raspberry Pi Zero 2 W, a 16GB SD card and a Diamond SRH-805 Antenna. 

Needs some soldering. (2 headers, RF module and an SMA connector)

Also available pre-assembled:

Also available as a PCB:

Experience the power of the SVXLink Analog Hotspot, a cutting-edge HAT designed exclusively for the Raspberry Pi Zero.

Packed with a formidable UHF 70 cm band radio module, this versatile device is accompanied by a state-of-the-art DAC/ADC, enabling it to function flawlessly as an EchoLink/SVXLink analog hotspot.

What's more, with the combination of a remote SVXLink with AnalogBridge (DVSwitch), you gain access to digital networks, including the Brandmeister and OpenDMR network, unleashing a world of limitless possibilities.




  • Raspberry PI Pin compatible
  • PCB ENIG (Electroless Nickel Immersion Gold)
  • UHF 70cm band frequency: 400~480 MHz
  • Tx and Rx frequency, Tx and Rx CTCSS, CDCSS can be set separately.
  • Band width 12.5KHz / 25 KHz
  • Output power 27dBm / 500mW
  • RX Sensitivity:-124 dBm
  • Adjustable RX en TX volume
  • 1 ppm KDS TCXO crystal
  • Wolfson WM8960 ADC/ 1W DAC 48khz
  • Signal/Tone Blue LED
  • TX/PTT Blue LED

Power consumption in combination with a Raspberry PI Zero W

  • Receive modus 220mA
  • Transmit modus 370mA

Kit Components

While we offer the option to purchase pre-assembled devices for your convenience, kit assembly is fairly easy (only 3 parts to solder) !


  • 1 x Rf.Guru PCB
  • 1 x 40 Pin Header
  • 1 x SMA socket
  • 1 x Frontplate
  • 1x Raspberry PI
  • 1x 16 GB SD Card
  • 1 x UHF SA818S Radio module
  • 1 x SRH805 Antenna

Hotspot enclosure

  • 1 x Enclosure Top Part
  • 1 x Enclosure Bottom Part
  • 2 x LED cover
  • 4 x standoff FtF 11mm
  • 3 x standoffs MtF 8mm
  • 7x 2.5M 6mm screws


The RF 50 ohm output requires an antenna with a SWR (Standing Wave Ratio) of less than 4:1, which is considered reasonable. If you experience sound distortion, it could indicate that the antenna being used has a high SWR, leading to common-mode currents that may affect the RF chip. To test, use a 50-ohm dummy load (for UHF) and consider using a more suitable antenna. We recommend and sell antennas that work without any issues.

Assembly / soldering

Begin by soldering the RF chip, aligning it according to the layout. Next, solder the 40-pin header, and finally, solder the SMA connector.



For those planning to connect their hotspot to a base antenna, we strongly advise incorporating an additional band filter. This essential component acts as a safeguard, preventing any potential signal interference due to harmonics.

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