jks

Please don't do this. But there is a much better way using that 6.3 VAC transformer. In fact, it's perfect.

Use a modern low-dropout linear regulator chip (LDO) to get exactly 5V. E.g. a modern LTC / Analog Devices LT1085-5 in a friendly 3-pin TO-220 package can handle 3A output. It's $2-3 USD. It will need to attach to a small heatsink. There are complete schematics in the data sheet and on the web.
https://www.analog.com/media/en/technical-documentation/data-sheets/1083ffe.pdf

Just because you have a 6.3VAC transformer doesn't mean you'd get 6.3 VDC. If you use a full-bridge rectifier you'd get 6.3*sqrt(2) = 6.3*1.4 = 8.9 VDC. But this is fine for the LDO input which always needs to be higher than the output anyway. Yes, the 8.9 to 5V difference will be burned away as heat by the regulation (and you'll need a good heatsink for the LDO to handle that). You don't need an output inductor with an LDO. Just the recommended input and output capacitors to the chip (see data sheet).

You would essentially be building one of those ~$60 Ebay power supplies we recommend on our webpage. They use the same design.

List updated to include new CNR frequencies: 15440, 17660, 17725, 17745, 17845, 17790

50 kHz wide? Good reception of a Russian or Chinese OTHR no doubt. You can better confirm this by zooming all the way in (z14) and looking for a "picket fence" structure to the signal on the spectrum display.

So it appears the Debian project and Beaglebone.org have stopped making updates to the Debian 8 (Jessie) release. For the Beagle, Debian 8.11 seems to be the last release. It has been run by a number of customers for a long time and also by us. So it seems safe now for Kiwi owners generally to do an upgrade and get the benefit of whatever security patches there have been between 8.5 and 8.11.

To do this login as root using ssh/PuTTY and use the following commands. (this can not be done from the Kiwi admin console tab)
If you haven't logged in this way in a while remember that your Debian root password has likely been changed to either the Kiwi admin password or the Kiwi's serial number if no Kiwi admin password has been set. The Debian root password has not been touched if you had set it to something other than the default of having no password.
See this post for details: http://forum.kiwisdr.com/discussion/1801/v1-354-security-improvements-debian-root-password-no-longer-unset-blank

cdp
mst      (stops the Kiwi server)
cd
pkup     (shell alias for "apt-get -y install debian-archive-keyring; apt-get update")
pkug     (shell alias for "apt-get -y dist-upgrade")

(lots of output, takes roughly 10 minutes)

reboot

A few minutes after the reboot the Kiwi server should be responding again. If you login to the Beagle and type the "dog" command you should see:

Debian 8.11
BeagleBoard.org Debian Image 2016-05-13
Linux kiwisdr 4.4.9-ti-r25 #1 SMP Thu May 5 23:08:13 UTC 2016 armv7l GNU/Linux

There is still the open question of how the Kiwi distribution, and thousands of Kiwi customers, will migrate to the current Debian 9 (Stretch) and/or Debian 10 (Buster) releases which are available for the Beagle. This needs time for research as there are many issues involved.

The DRM mistuning detection is extremely good. Screenshot below is Radio Marti, received in PA, mistuned by +1 kHz (!) It locks and decodes fine. It also probably helps that they are running a very conservative configuration.

The DRM spec has a little more information about the frequency pilot cells, section 8.4.2, page 121, http://kiwisdr.com/files/DRM/DRM.spec.v4.1.2.pdf

From the CHANGE_LOG file:

v1.394  May 31, 2020
    Noise blankers and filters:
        Added the spectral noise reduction filter by Frank, DD4WH and Michael, DL2FW, via the
        Teensy-ConvolutionSDR and UHSDR projects. See: github.com/df8oe/UHSDR/wiki/Noise-reduction
        This noise filter works really, really well. Especially for voice signals.
        A good alternative to the LMS filters.

    Note that the Wild blanker and all the noise filters (wdsp, LMS, spectral) don't currently work
    with the modes: IQ, SAS and DRM (i.e. the 2-channel IQ modes). This will be fixed at some point.

This filter is on the main control panel, audio tab, "noise > filter" menu. Click the "more" button to the right of the menu to adjust the filter parameters, although the filter works well with the defaults. In some cases you might have to increase the filter gain to match the filter-off level, especially during A/B comparisons. Try it with a weak station on the AM broadcast band or ham band SSB signal.

Note that some noise filters always require their sections be enabled via the "more" panel. Otherwise simply selecting their menu entry does nothing. In particular the wdsp and LMS filters since they have independent denoiser and autonotch sections that are enabled separately (or both simultaneously).

From the CHANGE_LOG file:

v1.392,393  May 28, 2020
    Noise blankers and filters:
        Added the Michael Wild noise blanker. Not a lot of operating experience with this yet.
            It seems not to work on some noise sources compared to the standard blanker.
            A good test source is 100 kHz Loran-C in AM mode using a UK Kiwi.
            Increase the gate time (standard blanker) or impulse samples (Wild blanker) to
            account for the longer Loran-C pulses compared to the usual impulse noise.

        Fixed wdsp filter: the control sliders had no effect previously!
            Now it works quite well. You have to adjust the gain carefully to prevent overload.

        Added test pulse gain and pulse width controls. And also whether the pulse is
            applied before or after the passband filtering. The Wild blanker seems only
            effective on post-filter pulses. Probably because the filter is turning the
            pre-filter step function pulses into nicer band-limited pulses.

From the CHANGE_LOG file:

v1.391  May 23, 2020
    User interface changes:
        SAL, SAU mode passband image will only show single sideband (just like LSB, USB).
        Ctrl/alt-click on mode button toggles modes backwards (most useful with SAM modes).
        Same works with keyboard shortcuts, e.g. ctrl/alt-A toggles SAM modes backwards.
    
    Noise blankers and filters:
        Reworked the audio tab user interface to support multiple blanker/filter algorithms.
        New algorithms planned but not yet available are greyed-out in the menus.
        From Warren Pratt's wdsp package added the variable-leak LMS algorithm.
    
    Merged Howard Su's RPi changes.
        Note: RPi is not officially supported by KiwiSDR. Ask for help on the KiwiSDR forum:
            http://forum.kiwisdr.com/discussion/1986/port-kiwisdr-to-raspberrypi-3b
    
    Bug fixes:
        Audio recordings made in SAS (synchronous AM stereo) mode now work.
        Fixed problem with ITU region 2 Kiwis and shift-clicking waterfall in 75/80m band segment.
        from lazywalker: fixed problems with frequency memory and reload value when transverter offset used.

From the CHANGE_LOG file:

v1.391  May 23, 2020
    User interface changes:
        SAL, SAU mode passband image will only show single sideband (just like LSB, USB).
        Ctrl/alt-click on mode button toggles modes backwards (most useful with SAM modes).
        Same works with keyboard shortcuts, e.g. ctrl/alt-A toggles SAM modes backwards.
    
    Noise blankers and filters:
        Reworked the audio tab user interface to support multiple blanker/filter algorithms.
        New algorithms planned but not yet available are greyed-out in the menus.
        From Warren Pratt's wdsp package added the variable-leak LMS algorithm.
    
    Merged Howard Su's RPi changes.
        Note: RPi is not officially supported by KiwiSDR. Ask for help on the KiwiSDR forum:
            http://forum.kiwisdr.com/discussion/1986/port-kiwisdr-to-raspberrypi-3b
    
    Bug fixes:
        Audio recordings made in SAS (synchronous AM stereo) mode now work.
        Fixed problem with ITU region 2 Kiwis and shift-clicking waterfall in 75/80m band segment.
        from lazywalker: fixed problems with frequency memory and reload value when transverter offset used.

Aluminum enclosures: Mouser now has 40+ in stock.