Analog Transceiver PCB 70cm UHF or 2m VHF 500mW

Analog Transceiver PCB

The Analog Transceiver PCB is now in its 3rd generation, featuring a redesigned power stage, improved filtering, and a more robust enclosure. We added additional DC-line filtering to eliminate noise sources, improved the thermal design and increased the output power to 28 dBm (~500 mW).

It is a compact and robust analog communications hotspot built around a Raspberry Pi. Choose between the UHF 70 cm version (400–480 MHz) or the VHF 2 m version (134–174 MHz). Thanks to its Wolfson WM8960 DAC/ADC, it runs flawlessly as an EchoLink / SVXLink / AllStar analog hotspot. When paired with AnalogBridge (DVSwitch), it can also bridge into BrandMeister, OpenDMR, and more.
*Currently only an SVXLink Bookworm image is available.

Specs at a Glance

Feature	Specification
Frequency Range	UHF: 400–480 MHz VHF: 134–174 MHz
Output Power	28 dBm (~500 mW)
RX Sensitivity	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 Codec	Wolfson WM8960 ADC / 1 W DAC (48 kHz)
Compliance	CE Certified (UHF worst-case spurious −86.23 dBc)
Power with Pi Zero W	~400 mA RX / ~600 mA TX

Included with the Product

• Complete tested device
• Preloaded SD card with our latest image
  

Key Features

• 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

Power Consumption with Pi Zero W

• Receive: ~400 mA
• Transmit: ~600 mA

Software

SVXSpot Repository and Image

 

 

 

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, fully aligned with industry-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.

Measurements

Spectrum

Harmonics

Channel Power