jks
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- jks
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Demo of new user interface [now available in v1.154]
Here is a demo of a new user interface under development. There is no antenna connected at present. http://kiwisdr.jks.com:8073/
Changes:
- New "option tab" bar that categorizes controls and status information.
- Frequency history next/prev buttons. Up/down arrows to right of frequency entry field. Keyboard users: press return key when desired frequency appears. If no selection with return key is made within 3 seconds frequency field will return to current frequency. Mobile device users: this feature is not useable at the moment.
- Added numeric value (in dBm) to S-meter.
- Add URL parameter wf={0, off, 1, 1hz, s, slow, m, med, f, fast}. E.g. kiwisdr.local:8073/?wf=1hz
- Removed less buffering and compression buttons until working.
- New "option tab" bar that categorizes controls and status information.
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Add waterfall rate to URL arguments
No, the WSPR extension would actually still work because the DSP part is done on the Beagle. The transmission of the WSPR spectrum, decode information etc. happens separately from the audio and wf streams. You are correct that some extensions process the audio/IQ data in the browser. And for those a Mute cannot stop the audio/IQ data. That's one of the reasons handling the audio mute case is a little more complicated. -
Save money on another Kiwi or tell a friend [KiwiSDR sometimes on drop.com for $100 off MSRP]
December 14/15: Massdrop is active again for 7 days. US$230 for a KiwiSDR kit if they get 3 orders. Limited to 6 units total. Best deal out there!
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Important: updated assembly guide (v1.1) for the aluminum enclosure
There is an updated assembly guide (version 1.1) for those of you who have purchased the new aluminum enclosure. Corrections to the parts list, clearer photos and an important note about removing one of the two pieces of sticky tape attached to the fan. Special thanks to Dave, PJ4VHF, from Bonaire for discovering the issue. -
OV Worries
I've explained this somewhere before (it really needs to be a FAQ so people can find it).The current FPGA logic just records an OV event if a single overflow is reported by the ADC. This is nonsense of course. You'll get overflows during normal operation as all those sine wave peaks from strong HF signals just happen to sum up during one ADC sample. That in itself is not a bad thing. You won't hear distortion because of it. Some sort of averaging of the ADC overflow output needs to occur and only when a threshold is exceeded should an OV event occur.And that's really your question: what should the threshold for ADC overflows be before an error indication is given? You could even imagine a a couple of different threshold being shown, done e.g. with colors. -
Wideband pulsing noise & Noise Blanker absence: I'm in trouble! [NB added in v1.152]
1 / 12 kHz = 83 usec. And the NB needs a couple of gate samples to work properly. So going below 100 usec doesn't get you any improvement.Moving the NB to a higher sampling rate in the FPGA is one option. But that will take some effort. Or increasing the audio bandwidth, which has its own problems. -
Wideband pulsing noise & Noise Blanker absence: I'm in trouble! [NB added in v1.152]
Okay. v1.153 is out with a threshold slider (get it now by rebooting). @Markone your Kiwi is already updated. Here is a screenshot with three different settings. The waterfall shows from bottom to top: no NB, NB 100 usec 50% thresh, 1000 usec 65% thresh. The last two sound the same but note how the waterfall is cleaned up a bit more.[re-uploaded image below]
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Wideband pulsing noise & Noise Blanker absence: I'm in trouble! [NB added in v1.152]
I found that on some weaker sources increasing the gate time to 1 msec (1000 usec on the slider) improved the noise reduction.@sv1btl ;I was going to add a threshold slider but ran out of time before yesterday's update deadline.
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Direction Finding and linking existing KiwiSDRs
Wow -- check Christoph's latest post: https://github.com/jks-prv/Beagle_SDR_GPS/issues/130#issuecomment-347206064It's a plot of a ground wave TDoA solution for DCF77 using three Kiwis relatively close by.
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Sound recording from multiple opened browse windows for diversity reception?
When you include the --kiwi-wav flag the GPS timestamps will also be added to the files when recording in IQ mode. This will allow post-processing the data for the very interesting projects now ongoing: Christoph's HFDF work and zfyoung's diversity reception.There is code in the repository (proc.m, read_kiwi_iq_wav.cc) for Octave (Matlab) to read the files and create various plots. I haven't tried this myself but see the Github GPS timestamp issue (https://github.com/jks-prv/Beagle_SDR_GPS/issues/130#issuecomment-346085747) for examples.
