2023-K-041-U | Kit - SVXLink Analog HotSPOT 70cm UHF 500mW
2023-K-041-U | Kit - SVXLink Analog HotSPOT 70cm UHF 500mW
Included: our enclosure, a Raspberry Pi Zero 2 W, a 16GB SD card and a 805SP Nagoya Triple Band Antenna.
Needs some soldering. (2 headers, RF module and an SMA connector)
Also available pre-assembled: https://shop.rf.guru/products/2023-k-041-u-pa
Also available as a PCB: https://shop.rf.guru/products/2023-p-041-u
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.
Datasheet
- 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) !
Hotspot
- 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 805SP Nagoya Triple Band 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
Antenna
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.
Software
https://github.com/Guru-RF/SVXSpot?tab=readme-ov-file#svxlink-bookworm-image
https://github.com/Guru-RF/SVXSpot
Disclaimer
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.