Persistence Spectrum

Simon Brown • December 22, 2023

Finally - it's here!

Dec 22nd, 2023: For a long time I've wanted to add a Persistence Spectrum, now I've had the time to do this and see how it enhances SDR Console. This is a powerful tool that allows radio enthusiasts to fine-tune their reception and transmission. With the Persistence Spectrum, users can explore a wide range of frequencies and persistently pursue the perfect signal

So, what is a persistence spectrum? From mathworks.com: The persistence spectrum is a time-frequency view that shows the percentage of the time that a given frequency is present in a signal. The persistence spectrum is a histogram in power-frequency space. The longer a particular frequency persists in a signal as the signal evolves, the higher its time percentage and thus the brighter or "hotter" its color in the display. Use the persistence spectrum to identify signals hidden in other signals.

And there's more good news - the persistence spectrum does not consume significant resources.

For more information:

Mathworks.com a simple explanation of a persistence spectrum, how to generate.
Signalhound implementation is an industry-leading solution.
ROHDE & SCHWARZ FSVR real-time spectrum analyser
Description
Flyer

In Action

Below is a video with an Airspy R2 running on Band II (stereo FM). The video starts with persistence off, then persistence is enabled and you see the spectrum building up.

< Older Post

Newer Post >

SDR Television Beta #5

By Simon Brown • July 18, 2025

SDR Television Found and fixed an unused massive memory allocation (up to 10GB), may have caused systems to freeze. Fixed fatal bug in matched filter array allocation. Changed the default transmit bandpass shaping filter roll-off to 0.20 in transmit and receive. Please look at the images below and apply the change. SDR Pluto Now show the AGC gain and RSSI. Added Default link to select the recommended gain - Fast Attack, 0dB visual. Known Problems Add support for tracking transmissions with (?) non-standard PCR data, example is G8GKQ. Using Pluto & variants, sensitivity is not as good as a NIM (hardware tuner). Will compare with SPECTRAN ECO in a week or so.

SDR Television Beta #4

By Simon Brown • June 30, 2025

Unexpected Beta #4 I wasn't planning to release another beta, but there was an error with a download link in the Blog port for Beta #3, also a few worthwhile improvements have been made, so here I go.

SDR Television Beta #3

By Simon Brown • June 18, 2025

Major Change Scroll down to the SDR Radio information. The bandwidths available for SDR Television when using a Pluto / LibreSDR have changed.

Simon (G4ELI) Live!

By Simon Brown • May 25, 2025

BATC Net, May 22nd 2025 Here's a snippet from the British Amateur Television Club net on QO-100. I hope it doesn't scare you.

Simon's World Map 1.5

By Simon Brown • May 25, 2025

UI Refresh And More...

No More Wireless

By Simon Brown • May 13, 2025

After too much grief, I've decided to stop using Wi-Fi to connect the small NUC systems in the computer room to my network: DX Cluster (Ubuntu) SDR Server (Windows) User Forums (Windows) These servers are in constant use, causing the wireless transmitter on my TP-Link AX50 to fail. By switching over to a wired network there's less demand on the wireless transmitter and the whole network has become far more reliable. In future I will only use Wi-fi when there's no alternative. I'm keeping a spare router ready just in case the AX50 fails.