jks

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Username: jks
Email: fhcsupcbeporg@xt@kvjviwisdr.com
Joined: February 2016
Visits: 34,037
Last Active: 4:01AM
Roles: Member, Administrator, Moderator
Points: 452

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KiwiSDR boot-up - problems?

jks

January 2017

It's very difficult to tell, but my first guess is a power supply that isn't supplying sufficient current. If the voltage sags below about 4.7V the power controller on the Beagle will shutdown. That'… (more)

It's very difficult to tell, but my first guess is a power supply that isn't supplying sufficient current. If the voltage sags below about 4.7V the power controller on the Beagle will shutdown. That's why the single power LED on the opposite side of the Ethernet connector from the 4 status LEDs goes dark.

The other thing to try is a re-install of the software from the supplied micro-SD card as discussed above.

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Warning: possible Forum malware

jks

December 2016

We've had several reports of people seeing this pop-up appear asking you to download software. Please don't click on anything in this image. Try reloading the Forum using a different URL until the… (more)

We've had several reports of people seeing this pop-up appear asking you to download software. Please don't click on anything in this image. Try reloading the Forum using a different URL until the popup goes away. We'll try and get this sorted out as soon as possible.

Thank you.

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Help diagnosing interference issues

jks

December 2016

Okay, first of all my apologies for not understanding the sophistication of your setup. It is absolutely excellent. Hopefully my long-winded explanation above will help someone else because you… (more)

Okay, first of all my apologies for not understanding the sophistication of your setup. It is absolutely excellent. Hopefully my long-winded explanation above will help someone else because you clearly understand the issues.

Now the problem: You've got the worst case of a bad switching power supply I have ever seen. The first clear carrier is on 167.9 kHz @ -66 dBm and appears about every 30.5 kHz up to 30 MHz. The carrier is narrow and stable but has "static" mixed in. This is a classic trait I've seen many times. The UVic beta site had a horrible signal like this around 14 kHz. Fortunately the harmonics died out in the LF spectrum. After almost a year it was traced to a bad power supply in an Ethernet switch.

The fact that the harmonics go to 30 MHz and are so loud makes me wonder if it's a problem with one of the switchers on the Beagle. Like a bad filtering cap or something. The overall 0-30 MHz spectrum looks similar to the high noise problems we had with an early Element 14 manufactured Beagle. I assume this is a BeagleBone Green? I'd be happy to send you a replacement.

There is also another huge signal (-56 dBm) at 86.5 kHz that is about 2 kHz wide and has the classic look of a "spread spectrum" (flattop) clock. It has harmonics in the NDB band every 9.5 kHz but dies out at MF.

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Help! display partly dead.

jks

December 2016

v1.28, and a few releases afterwards, were completely FUBAR unfortunately.
kiwi.bin fails on PMUX check

jks

December 2016

In case anyone is interested I'll explain: For various reasons a user program (one with privileges) cannot directly change the pin mux (PMUX) that determines which device functions and attributes are… (more)

In case anyone is interested I'll explain: For various reasons a user program (one with privileges) cannot directly change the pin mux (PMUX) that determines which device functions and attributes are assigned to the I/O pins of the Sitara processor used on the Beagle. This is specified by device (cape) overlay files used by the kernel and by some other mechanisms. So there is some checking code to make sure the pins are in the state the Kiwi server expects. The panic you saw occurred when one of the unused expansion pins on the P8 connector was detected to have been set as an input with a pull-up rather than a plain input with no pull-up or pull-down. More pins were in unexpected states as shown in the file you attached.

Now this by itself is not a problem. But the real question is why is this different all of a sudden when there are hundreds of other units out there running without an issue? This is one of the reasons why the Kiwi is shipped with a fixed, known-working Debian distribution. To try and eliminate the side-effects of dependancies like these.

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Do you want a Facebook Page for KiwiSDR?

jks

December 2016

"A" on 2097 is one of HF pirate beacons. Some of the best info is on HF Underground: https://www.hfunderground.com/board/index.php/topic,9478.0.html

For a discussion of military "letter/marker… (more)

"A" on 2097 is one of HF pirate beacons. Some of the best info is on HF Underground: https://www.hfunderground.com/board/index.php/topic,9478.0.html

For a discussion of military "letter/marker beacons", some of which are in the Kiwi dx list, see here: https://en.wikipedia.org/wiki/Letter_beacon

I personally boycott Facebook, but you guys can obviously do what you want. But I won't be contributing there if you do.
At some point we'll need subcategories for the Kiwi discussions here.

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Is there any gain control?

jks

November 2016

Hi Neil,

If you press the "more" button on the lower right control panel you'll see various AGC parameters that can be adjusted. Changing the Threshold and Slope will effect the gain. There is also a
… (more)

Hi Neil,

If you press the "more" button on the lower right control panel you'll see various AGC parameters that can be adjusted. Changing the Threshold and Slope will effect the gain. There is also a Manual Gain slider that becomes active if you turn the AGC off.

There is the volume control of course. There is no hardware gain control in the RF front-end. This was a cost tradeoff.

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WSPR Upload Fails?

jks

December 2016

Okay, I think I know now what this might be. I'll try and get a fix in the next release so everyone can test.
Thanks for the help!
Blank web page problems

jks

November 2016

Something is dreadfully wrong here. Try pulling from git first:
cdp
mst
m git
mc
m
mi
ku
Blank web page problems

jks

November 2016

This looks like the files in the in-program/in-memory cache have become corrupted somehow. Try building and installing the daemon from scratch:
cdp
more Makefile -- the first two lines: what version… (more)

This looks like the files in the in-program/in-memory cache have become corrupted somehow. Try building and installing the daemon from scratch:
cdp
more Makefile -- the first two lines: what version number does it say you're running?
msa
mc
m
mi
ku

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Howdy, Stranger!

jks

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