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Amateur radio interferometry

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This page hosts topics related to low frequency radio astronomy. Amateur and professional low frequency radio astronomy.

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Juan Manuel, David Lonard3

11/22/24

XF Correlator in GNU Radio

Thanks David, the idea of the XF correlator is to perform some tests as part of my degree project,

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XF Correlator in GNU Radio

Thanks David, the idea of the XF correlator is to perform some tests as part of my degree project,

11/22/24

7/4/24

Interferometry with the BladeRF 2.0 SDR

Hello everyone, I recently purchased a BladeRF 2.0 SDR as a replacement for my older LimeSDR and XTRX

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Interferometry with the BladeRF 2.0 SDR

Hello everyone, I recently purchased a BladeRF 2.0 SDR as a replacement for my older LimeSDR and XTRX

7/4/24

David Lonard, … Marcello Montisci7

1/29/24

Channel crossover fix for LimeSDR and XTRX SDR radios - Best fringes yet

Hello Marcello, I don't have a USRP B210 myself, but I would look at this web site for some clues

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Channel crossover fix for LimeSDR and XTRX SDR radios - Best fringes yet

Hello Marcello, I don't have a USRP B210 myself, but I would look at this web site for some clues

1/29/24

David Lonard, … John Yu7

8/30/23

Real time FX correlator

John, I don't have the raw IQ files from my BladeRFs any longer. However, I have some integrated

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Real time FX correlator

John, I don't have the raw IQ files from my BladeRFs any longer. However, I have some integrated

8/30/23

David Lonard, Jim Sky3

12/30/22

430-440 MHz FX interferometer

Jim, It is already 'real-time' in that the FX step is done in the GPU and recorded to a file

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430-440 MHz FX interferometer

Jim, It is already 'real-time' in that the FX step is done in the GPU and recorded to a file

12/30/22

11/14/22

polarization of 160 meter FT8 signals

Hello everyone, Here is a polarization analysis of FT8 signals at 1.84 MHz using a pair of

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polarization of 160 meter FT8 signals

Hello everyone, Here is a polarization analysis of FT8 signals at 1.84 MHz using a pair of

11/14/22

11/7/22

CODAR bistatic radar using LimeSDR

Here is some math regarding the IFFT. I'm sampling at 2MSPS, so each horizontal bin represents a

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CODAR bistatic radar using LimeSDR

Here is some math regarding the IFFT. I'm sampling at 2MSPS, so each horizontal bin represents a

11/7/22

David Lonard, Jim Sky4

10/16/22

Starlink beacons

I hooked up my two lnbs to a pair of 80 cm dishes to get a more focused look at the Starlink beacons.

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Starlink beacons

I hooked up my two lnbs to a pair of 80 cm dishes to get a more focused look at the Starlink beacons.

10/16/22

5/25/22

143 MHz, 340 meter baseline integrated data you can play with

I'm still working on gridding to get a better image of this data. In the mean time, here is a 2D

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143 MHz, 340 meter baseline integrated data you can play with

I'm still working on gridding to get a better image of this data. In the mean time, here is a 2D

5/25/22

4/19/22

Night time 143 MHz interferometer observations

Here are two images of fringes from 10 days worth of integration (power and phase) when Sgr A, Cas A

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Night time 143 MHz interferometer observations

Here are two images of fringes from 10 days worth of integration (power and phase) when Sgr A, Cas A

4/19/22

4/4/22

Updated 143 MHz interferometer

Hello everyone, I made a mistake in the interpretation of some of my previous interferometer data. I

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Updated 143 MHz interferometer

Hello everyone, I made a mistake in the interpretation of some of my previous interferometer data. I

4/4/22

David Lonard, … Brett Dawson14

4/1/22

I haven't tried either the USRP B210 or the BladeRF 2.0 SDR myself, but they should work. I have

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I haven't tried either the USRP B210 or the BladeRF 2.0 SDR myself, but they should work. I have

4/1/22

3/30/22

143 MHz interferometer update - comparisons of two sidereal days

Here is a 1D phase plot from the complex visibility filterbank data that I showed yesterday to

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143 MHz interferometer update - comparisons of two sidereal days

Here is a 1D phase plot from the complex visibility filterbank data that I showed yesterday to

3/30/22

3/5/22

143 MHz 'regular' interferometery update

340meter2.jpeg is the power spectrogram 340meter1.jpeg is the phase spectrogram 138 to 148 MHz On

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143 MHz 'regular' interferometery update

340meter2.jpeg is the power spectrogram 340meter1.jpeg is the phase spectrogram 138 to 148 MHz On

3/5/22

David Lonard, Jim Sky3

3/5/22

141 MHz regular interferometry with QHA antennas

Yes, I agree that 2 meters is a great place for radio astronomy. To me, the biggest advantage is that

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141 MHz regular interferometry with QHA antennas

Yes, I agree that 2 meters is a great place for radio astronomy. To me, the biggest advantage is that

3/5/22

2/15/22

VLBI fringe stopping

Integration of the three sources shows a nice over S/N. No other sources are seen though. On Monday,

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VLBI fringe stopping

Integration of the three sources shows a nice over S/N. No other sources are seen though. On Monday,

2/15/22

Timothy Szymanski, David Lonard2

1/15/22

New website resource

I really like reading over Daniel Estevez's work. It has given me some ideas about how to use

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New website resource

I really like reading over Daniel Estevez's work. It has given me some ideas about how to use

1/15/22

Timothy Szymanski

11/24/21

Radio Sky Observations

Happy holidays everyone, I watched a really intriguing series of videos from the RF Get Down youtube

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Radio Sky Observations

Happy holidays everyone, I watched a really intriguing series of videos from the RF Get Down youtube

11/24/21

Brett Dawson, David Lonard13

11/9/21

C Band Interferometer

Brett, It looks promising to me. The noise on either side of the Orion A fringes appears to be random

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C Band Interferometer

Brett, It looks promising to me. The noise on either side of the Orion A fringes appears to be random

11/9/21

9/15/21

ATSC bistatic radar

Hello everyone, Here is a bit of dabbling that I've done to use an ATSC digital TV signal as a

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ATSC bistatic radar

Hello everyone, Here is a bit of dabbling that I've done to use an ATSC digital TV signal as a

9/15/21

8/9/21

Phase analysis of a geosynchronous satellite Ku band beacon

I would also add that by using a cross correlator, I can see the phase noise spreading out in

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Phase analysis of a geosynchronous satellite Ku band beacon

I would also add that by using a cross correlator, I can see the phase noise spreading out in

8/9/21

7/25/21

FMCW OTH radar programs

Google wont let me post the template and example .fit files for some reason. If you run OTHACQ3.py,

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FMCW OTH radar programs

Google wont let me post the template and example .fit files for some reason. If you run OTHACQ3.py,

7/25/21

7/8/21

Polarization analysis of HF over-the-horizon radar signals

Here is some more analysis of the evolution of phase angles of FMCW pulses from pulse to pulse. It

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Polarization analysis of HF over-the-horizon radar signals

Here is some more analysis of the evolution of phase angles of FMCW pulses from pulse to pulse. It

7/8/21

David Lonard, Rolando Paz4

7/2/21

Sgr A - 9 days of integration

Hi David. Thanks for the explanation! Regards El jue., 1 jul. 2021 8:37 pm, David Lonard <dmlonard

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Sgr A - 9 days of integration

Hi David. Thanks for the explanation! Regards El jue., 1 jul. 2021 8:37 pm, David Lonard <dmlonard

7/2/21

6/29/21

AM radio carrier analysis

Hello everyone, I've been dabbling some more with lower frequency polarimetry and thought I would

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AM radio carrier analysis

Hello everyone, I've been dabbling some more with lower frequency polarimetry and thought I would

6/29/21

6/17/21

50 MHz elliptical polarization study

Hello everyone, As a side project, I've been interested in using the 2x2 MIMO capability of the

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50 MHz elliptical polarization study

Hello everyone, As a side project, I've been interested in using the 2x2 MIMO capability of the

6/17/21

string, … David Lonard10

6/15/21

David, For the rear end, I've pre-ordered the Lime SDR. I'll have the computer built long

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David, For the rear end, I've pre-ordered the Lime SDR. I'll have the computer built long

6/15/21

5/11/21

C band interferometer update - 5 day integration

Hello everyone, I have some new data that integrates drift scans from my interferometer over five

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C band interferometer update - 5 day integration

Hello everyone, I have some new data that integrates drift scans from my interferometer over five

5/11/21

David Lonard, wglog...@gmail.com2

5/4/21

Polynomial fitting for interferometer phase alignment

Great results! On Tuesday, May 4, 2021 at 5:40:22 PM UTC-4 David Lonard wrote: Hello everyone, I'

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Polynomial fitting for interferometer phase alignment

Great results! On Tuesday, May 4, 2021 at 5:40:22 PM UTC-4 David Lonard wrote: Hello everyone, I'

5/4/21

4/26/21

Upper C band interferometer - Norsat LNBs

Hello everyone, Here is an update on my C band interferometer. I've made an upgrade to Norsat

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Upper C band interferometer - Norsat LNBs

Hello everyone, Here is an update on my C band interferometer. I've made an upgrade to Norsat

4/26/21

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