New Airspy HF+

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mbott

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The following is a cut & paste of two emails in the SDR-Radio-com Yahoo! group this morning.

Airspy HF+
Preliminary specs:
RX range: 0 .. 30 MHz (HF) and 60 - 270 MHz (+)
Architecture: Hybrid (Direct conversion + DDC) using 2 x sigma delta ADC's @ 36MSPS
Front end: Tracking Filters (all bands), High Dynamic Range LNA's and Mixers
AGC: Smart AGC controlled by the DSP
DSP: CIC, CFIR and a final (programmable) channel FIR - 18bit resolution
Final bandwidth/resolution after DDC: 18bit @ 600kHz - Scaled and streamed as 16bit
Image rejection: better than 120dBc
Blocking DR: 108 dB
Separate HF and VHF RF inputs - with option to use one multiplexed input if desired
USB 2.0 with Plug and play - No drivers needed
The RF section resides inside a metal shield
Aluminium enclosure about 60 x 100 x 15 mm^3

2 x 36MSPS IQ (equivalent to direct sampling at 72 MSPS) gives roughly 36MHz of bandwidth, however the ADC's used are sigma-delta with intrinsic anti-alias filtering.
We start with 16bit IQ at 36MSPS then it is frequency translated and decimated to 744.192 ksps 18bit IQ with a bit more than 600 kHz bandwidth plus the digital filter roll off. Given the very nature of sigma delta ADC's, the pressure on the front-end filtering is relaxed and the tracking filters are even more effective.
The image rejection is performed using a newly designed algorithm that matches the performance of the hardware.
All the decimation number crunching happens in the device like in most high end DDC receivers, so we only need a small USB throughput in the end (~23Mbps), and the CPU usage in the PC is very low.
Performance wise, the result is comparable to things like Perseus, RFSPACE, Elad, etc. but with a more modern full CMOS sensitive front end and at a fraction of the price.
 

mbott

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Simon Brown of SDR Console has been hinting about this receiver for the last couple of weeks. I took his comments to mean he might have had one. Time will tell.

--
Mike
 

Flatliner

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It's odd that they are focusing on limited features. The Airspy (Yay!... but where is HF?) Then the convertor appeared (Yay!... but where is the pass-though?) Then the Mini takes to the stage? (Yay!.. but what was the point?) and now the rumour of an HF/VHF only unit is leaked? The audience for that is even more limited.

Meanwhile... SDRplay are selling a DC to 2GHz, twin/triple input, all-in-one unit (in a metal box, if desired) and cheap.

One thing that history shows, is that niche functions are ultimately overtaken by cheaper general-purpose devices.
 

mtindor

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Of course, all of the Youssef haters [already see some in this thread] will talk about other cheaper options that provide more of this or more of that.

Fact is, for the price that any of the currently produced / past produced Airspys, there isn't anything else out on the market that could touch their performance on VHF/UHF. i'll stand by that statement forever.

I don't need to like Youssef [although I do] to like the products he comes out with.

I'm anxious to hear more about this.

Mike
 

mbott

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I am also anxious to hear more about this, too. Although I'm extremely happy with my 2 SDRplays, I enjoy listening to radio, and if the Airspy HF+ allows me to do that, then great!

--
Mike
 
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