ARLA/CLUSTER: Disponivel OpenSDR v 3.2.28 da Apache Labs SDR Radio

[João Costa > CT1FBF]

Apache Labs - PowerSDR 3.2.28

Waters & Stanton Europe’s Ham store confirm the release of *OpenSDR v
3.2.28* which compliments the Apache Labs SDR Radio products.

The new release has enhancements to the Radio Astronomy functionality
within PowerSDR along with a new Spectral Noise Blanking system to
complement the existing NB and NB2 noise blanking features. Other
enhancements and more details of the release include the following:

PowerSDR/OpenHPSDR mRX PS v3.2.28 has been released.

This release can be downloaded from the openhpsdr.org website.
http://openhpsdr.org/download.php

This release contains the following changes:

Radio Astronomy (RA) Joe, K5SO
- added Rx2 to the RA feature to allow both Rx1 and Rx2 data to be
simultaneously collected/viewed
- added a new control to the RA display to allow the selection among options
of
1) simultaneous display of Rx1 data and Rx2 data,
2) display of Rx1 data only, or
3) display of Rx2 data only
- added Rx2 data to the read/write-to-disk option from the RA window; data
format for each line of the .csv file is time(secs), Rx1(dBm), Rx2(dBm)
regardless of what option is selected for display in the RA window
- added a compiler directive to try to resolve the EU vs US formatting
issue of the previous RA read/write to .csv files

Spectral Noise Blanker (SNB)

Following the release of new Noise Reduction technology, NR2, earlier this
year, this release includes another new tool for your "Noise
Toolbox": SNB, a Spectral Noise Blanker. There are many different types of
noise/interference and so having an assortment of tools at your disposal is
of great benefit. The Spectral Noise Blanker is of a very different type
than our Wideband blankers, NB and NB2, and will address some additional
impulse noise issues. It can be used along with NB/NB2 when beneficial. It
also plays quite nicely with NR/NR2 to address both Impulse Noise (SNB) and
Random Noise (NR/NR2) simultaneously.


Example PowerSDR display on 15m during a contest

While NB/NB2 operate on wideband spectrum data and impact both the
panadapter display and the S-meter, SNB operates differently and impacts
only audio. SNB uses Linear Predictive Coding (LPC) to evaluate the
spectral formants of its input. It then uses that spectral information to
identify impulses and to synthesize replacement samples for the signal in
regions where it has been corrupted by those impulses.
Yes, it does not just zero or interpolate across corrupted samples, it
synthesizes approximations of the original signal using the spectral
information and the samples before and after the impulse. This technology
largely does not depend upon amplitude to identify impulses; therefore it
can often detect impulses that are equal to or smaller than the amplitude
of the signal and can clean signals when other blankers fail. Computing
replacement samples requires quite a bit of matrix computation; so, to keep
compute requirements within reasonable limits, SNB currently restricts
audio bandwidth to roughly 300Hz to 5400Hz.
This is a design trade-off which will be revisited as faster processors
become available.

To turn this blanker on, simply click the "SNB" button on the main console.
(Note that NB and NB2 have now been moved to the same button.)
In Setup, there are a couple threshold adjustments, "Threshold 1" and
"Threshold 2". However, the algorithm is self-adjusting and you probably
will not be able to achieve much improvement by fine tuning these.

Summary of your current Noise-Interference Toolbox:

Impulse Noise
* NB (Wideband)
* NB2 (Wideband)
* SNB (Spectral)

Random Noise
* NR (Variable-Leak LMS Algorithm)
* NR2 (Signal/Noise Power Density Algorithm)

Carriers & Similar
* ANF (Automatic Notch Filter - Variable-Leak LMS)

Noise / Interference Null
* Diversity Reception [Requires a radio model with two ADCs]

Peaking Filters
* Audio Peaking Filter [for CW]
* Dolly Filter [for RTTY]

Expect future additions!

Various Bug Fixes and features
- added the ability to split the open collector outputs between VFOA
(1-4) and VFOB (5-7). To use, click on the "4x3 Split" checkbox on the
Setup=>General=>(Penny/Hermes/ANAN Ctrl) page.
- added a 'mask' field to the static IP address feature. This allows using
the correct broadcast address for the specific port the radio is on. This
corrected a problem when using a static IP address when multiple adapters
are present. See the Setup=>General=>Hardware Config. page.
- added multilingual for ToolTip comments
- fixed the 6m panadapter display reading for the Anan-10E
- fixed a problem with PowerSDR crashing on start-up when the Disable PA
for HF/VHF is enabled
- fixed an intermittent issue with diversity

You WILL need to reset your database.
If you have release v3.2.28 dated prior to 3 Oct 2015 you will need to
manually uninstall it before installing this release. The installer will not
automatically uninstall it for you. This only applies to the pre-release of
v3.2.28 and not prior version numbers.

Thanks for Dough, W5WC for his dedication to the development of PowerSDR
which can be used on many SDR platforms outside of that of the Apache Labs
range.

Waters & Stanton (W&S), Europe’s Hamstore are European distributors for the
Apache Labs range of products and are one of the longest standing Ham Radio
suppliers in the World with more than 42 years in business.

W&S also provide the largest dedicated Ham Radio demonstration facility in
Europe with 12 independent operator positions and contest-grade antennas
ranging from 160M through to 23cms.

For more information contact:
Justin.johnson  wsplc.com

www.wsplc.com
www.apache-labs.co.uk
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