Airspy HF+ SDR Radio Receiver
We are pleased to introduce the brand new design that offers quite amazing performance.
The Airspy HF+ has improved the linearity of its mixers and the phase noise of the Local Oscillator. It adds extensive RF and IF filtering by the use of N-path filters and uses a very high dynamic range Sigma Delta ADC. All of which has made it the most wanted SDR radio of the year.
Like most high-end HF receivers, the HF+ uses very high dynamic range ADC's and front-ends. But unlike the current offerings in the market, it also brings more frequency agility by using high performance passive mixers with an excellent polyphase harmonic rejection structure.
No external band aid filters are required like the lower end HF receivers, which makes it the ideal companion for light portable high performance operation.
Both the architecture and level of integration achieved in this design allow us to bring top performance reception at a very affordable price.
Airspy HF+ achieves excellent HF performance by means of a low-loss band filter, high linearity LNA, high linearity tunable RF filter, a polyphase harmonic rejection (HR) mixer that rejects up to the 21st harmonic and multi-stage analog and digital IF filtering.
The 6 dB-stepped AGC gain is fully controlled by the software running in the DSP which optimizes the gain distribution in real time for optimal sensitivity and linearity. Harmonic rejection is a key issue in wide band HF receivers because of the large input signal bandwidth of the input signal. The output of the IF-filter is then digitalized by a high dynamic range sigma delta IF ADC for further signal processing in the digital domain.
Excellent VHF performance is also achieved by using optimized signal paths composed of band filters, high linearity LNAs with a stepped AGC, a polyphase harmonic rejection mixer and IF filters optimized for their respective bands.
The amplifier gain is switchable in 3 dB-steps and fully controlled by the AGC running in the DSP. The RF signal is converted to baseband by a high linearity passive mixer with a polyphase harmonic rejection structure. The low-IF signal is then converted into the digital domain by the same IF ADC used in the HF chain.
The IF analog to digital converter (ADC) is a 4th order multi-bit noise shaping topology; it features very high dynamic range and linearity. The IF-ADC sampling rate is determined by a control algorithm running in the embedded DSP.
This advanced technique adjusts the sampling rate depending on the tuning frequency with the goal of avoiding the disturbances and spurs generated by the switching discrete-time sections of the IF-ADC.
Digital Down Converter
Once the IF signal is digitalized, the high sample rate I/Q stream is then frequency translated and processed with cascaded CIC and FIR decimation stages. After every stage, the sample rate is reduced and the resolution increased.
The final signal at the output has 18bit resolution and an alias rejection performance of 108 dBc. The data is then scaled to 16bit and sent to the Micro-Controller for streaming over USB.
The main advantages over techniques from the legacy super-heterodynes up to the now mainstream direct sampling is that the whole receiver chain is well protected against out of band blockers while still relaxing the RF filtering constraints, making it simple and cost effective.
The natural filtering of the sigma-delta ADC combined with the excellent linearity and sensitivity of the analog chain reaches an unprecedented level of performance and integration.
Use it over the network!
Connect as many SDR applications as needed to the HF+, over the Internet or in your own local network with near zero latency thanks to the new SPY Server software.
This setup basically brings all the flexibility of Web based SDRs while still benefiting from the full power of desktop applications. The IQ data is processed in the server with state of the art DSP and only the required chunk of spectrum is sent over the network. What is sent is the actual IQ signal, not compressed audio.
This means you can use all your favorite plugins to process the IF, eliminate noise and perform heavy lifting of the signals as you are used to do with locally connected SDR's.
We have a tradition of building multi-tools, so we made sure the SPY Server runs on 32/64bit Windows and Linux on Intel and ARM processors without any compromises. Low cost Raspberry Pi 3 and Odroid boards are in the party.
HF coverage between 9 kHz .. 31 MHz
VHF coverage between 60 .. 260 MHz
-140.0 dBm (0.02 µV / 50 ohms at 15MHz) MDS Typ. at 500Hz bandwidth in HF
-141.5 dBm MDS Typ. at 500 Hz bandwidth in FM Broadcast Band (60 ? 108 MHz)
-142.5 dBm MDS Typ. at 500 Hz bandwidth in VHF Aviation Band (118 ? 136 MHz)
-140.5 dBm MDS Typ. at 500 Hz bandwidth in VHF Commercial Band (136 ? 174 MHz)
-140.0 dBm MDS Typ. at 500 Hz bandwidth in the upper VHF Band (> 174 MHz)
+15 dBm IIP3 on HF at maximum gain
+13 dBm IIP3 on VHF at maximum gain
110 dB blocking dynamic range (BDR) in HF
95 dB blocking dynamic range (BDR) in VHF
150+ dB combined selectivity (hardware + software)
120 dB Image Rejection (software)
Up to 660 kHz alias and image free output for 768 ksps IQ
18 bit Embedded Digital Down Converter (DDC)
22 bit! Resolution at 3 kHz channel using State of the Art DDC (SDR# and SDR-Console)
+10 dBm Maximum RF input
0.5 ppm high precision, low phase noise clock
1 PPB! frequency adjustment capability
Very low phase noise PLL (-110 dBc/Hz @ 1kHz separation @ 100 MHz)
Best Noise reduction of the market using state of the art algorithms
2 x High Dynamic Range Sigma Delta ADCs @ up to 36 MSPS
No Silicon RF switch to introduce IMD in the HF path
Routable RF inputs with simple modification
Wide Band RF filter bank
Tracking RF filters
Sharp IF filters with 0.1 dB ripple
Smart AGC with real time optimization of the gain distribution
All RF inputs are matched to 50 ohms
4 x Programmable GPIO?s
No drivers required! 100% Plug-and-play on Windows Vista, Seven, 8, 8.1 and 10
Industrial Operating Temperature: -45°C to 85°C
High Performance Networked HF/VHF Radio
Ham Radio (HF + 2m)
Short Wave Listening (SWL)
VHF-L TV DX
Remote Telemetry Radio Receiver
Low Bands IoT