Christoph

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Username: Christoph
Joined: November 2017
Visits: 4,593
Last Active: March 26
Roles: Member
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External GNSS-disciplined rubidium input?

Christoph

February 2021

I agree with @jks. The dominant source of error is ionospheric propagation. In addition, not all KiwiSDRs report their position accurately, i.e., their positions are either put manually by the owners… (more)

I agree with @jks. The dominant source of error is ionospheric propagation. In addition, not all KiwiSDRs report their position accurately, i.e., their positions are either put manually by the owners or get rounded in order not to reveal the exact location of a given KiwiSDR.
Also consider the fact that one sample at 12000 samples/sec corresponds to 25 km, and the bandwidth of most signals on shortwave is less than 12 kHz. So if the bandwidth of a signal is 3 kHz the corresponding pseudo-range resolution is 100 km.
Having said that, it would be interesting to compare the stability of the KiwiSDR GNSS-derived timestamps w.r.t. ones from a GNSS-disciplined rubidium standard.
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Early demonstration of "channel nulling"

Christoph

November 2020

To null, use SAS mode and select the "audio" tab on the main control panel. On the bottom SAM line you should find the "channel null" menu. Select "null LSB" or "null USB". Make sure the PLL carrier
… (more)

To null, use SAS mode and select the "audio" tab on the main control panel. On the bottom SAM line you should find the "channel null" menu. Select "null LSB" or "null USB". Make sure the PLL carrier is around 0 Hz (+/- 100 Hz maybe). If it's way off then make sure you're tuned to the station center frequency, switch to AM mode briefly, then back to SAM. The PLL should lock.
Did you mean SAM mode? It's the only mode in which I find the "channel null" menu.
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v1.419,423: added non-NBFM squelch

Christoph

November 2020

Small correction: as far as I know the squelch feature in kiwirecorder.py was implemented by its original author and not by me.
v1.419,423: added non-NBFM squelch

Christoph

November 2020

Small correction: as far as I know the squelch feature in kiwirecorder.py was implemented by its original author and not by me.
Measuring the AM Modulation in the AM and AMN Mode

Christoph

June 2020

see https://hcab14.blogspot.com/2020/06/am-modulation-index.html
and https://github.com/hcab14/gr-kiwisdr/blob/master/examples/am_rms_modulation_depth_kiwi.grc
Measuring the AM Modulation in the AM and AMN Mode

Christoph

June 2020

see https://hcab14.blogspot.com/2020/06/am-modulation-index.html
and https://github.com/hcab14/gr-kiwisdr/blob/master/examples/am_rms_modulation_depth_kiwi.grc
Fixing broken kiwirecorder installation [fixed now]

Christoph

October 2019

Hi Rob,

I can reproduce the problem. A fix is on its way. There is no need to reinstall python.
KiwiSDR as remote controlled RX

Christoph

March 2019

See kiwirecorder.py https://github.com/jks-prv/kiwiclient/tree/jks-v0.1
GNURadio package gr-kiwisdr

Christoph

March 2019

Following an idea by @WA2ZKD, the coherent combination of KiwiSDR streams was tested using a DRM signal. DRM data was successfully decoded from two coherently combined IQ data streams where the… (more)
GNURadio package gr-kiwisdr

Christoph

March 2019

Following an idea by @WA2ZKD, the coherent combination of KiwiSDR streams was tested using a DRM signal. DRM data was successfully decoded from two coherently combined IQ data streams where the… (more)

Howdy, Stranger!

Christoph

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