jks
About
- Username
- jks
- Joined
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- Member, Administrator, Moderator
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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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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
Christoph's latest post on https://github.com/jks-prv/Beagle_SDR_GPS/issues/130 shows how his GPS timestamps are within 20 usec of DCF77 (77.5 kHz) as received by a couple of Kiwis a few hundred km distant. Really fantastic work!
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Direction Finding and linking existing KiwiSDRs
There have been three or four people recently express interest in working on HFDF. Some on here or on Github issues or in private emails to me. I'll try and point everyone to this thread.It is important to note that V/UHF DF is significantly different from the HFDF problem due to the issues imposed by the nature of the ionosphere at HF. It is much more complicated than you would expect. But we have this wonderful resource: lots of geographically diverse Kiwi installations and now GPS timestamped IQ data thanks to Christoph's recent work (https://github.com/jks-prv/Beagle_SDR_GPS/issues/130)A recent example of V/UHF DF using RTL-SDRs: https://www.rtl-sdr.com/localizing-transmitters-to-within-a-few-meters-with-tdoa-and-rtl-sdr-dongles/Slideshow about HFDF techniques: http://www.g4axx.com/HF_Radio_Direction_Finding.pdf
