New Dimensions: Airspy HF+ Discovery

A big achievement: The new Airspy HF+ “Discovery” is even smaller than the Airspy HF+.

From start, Airspy SDRs with their unique block diagram received an overwhelming reputation in the challenging HF bands. They feature a high dynamic range in a small case – and even match a small wallet, too. Now their new “Discovery” enters new dimensions in every respect. The photo on top shows the small black beauty in the foreground compared to the already known Airspy HF+ in the background.

It is already running here with e.g. SDR# and SDRC V3 software, see below. The very first impression is that of an SDR with an exceptionally low noise level and, thanks to its tracking filters, a matching dynamic range. Alas, being a bit short in time these days, I hope to come back with some more solid comments in due time.-

A first look onto the 19m broadcast band shows the low noise level plus the high sensitivity, resulting in a great SNR.

Specified to receive already from 0.5 kHz, it is a true performer also on VLF – see screenshot below with reception of US Navy Cutler/Maine on 24 kHz, about 35 dB down of Germany powerhouse DHO38 just 600 Hz below. Reception: August 2nd, 2019, 14:38 UTC in Germany with vertical active dipole (2×2.5 m) MD300DX.

Fine VLF reception of MSK signal MIL-STD-188-140 from US Navy in Cutler/Maine on 24 kHz. Horizontal lines are from thunderstorms, and the “hill” peaking near 34.5 kHz is local noise.

3 comments

  • DrThamminanaKR

    Excellent review. Thanks…

  • Leck Harris, K9RJ

    Looking at the 19m waterfall it looks like you have a very high noise floor. Why do you say “low noise level” . Thanks for the review.

    • Thanks, Leck, for your comment. The SNR is the pivotal thing. And measured with software SDRC V3, the noise level of the receiver is -140 dBm/Hz at 30 MHz and -132 dBm at 15 MHz. That’s a world-class result, see also Bob Sherwood’s tests_ http://www.sherweng.com/table.html Reading this, please bear in mind that sensitivity is just one feature of a receiver … 73 Nils, DK8OK

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s