Groups
Sign in
Groups
Amateur radio interferometry
Conversations
About
Send feedback
Help
Amateur radio interferometry
Contact owners and managers
1–30 of 87
This page hosts topics related to low frequency radio astronomy. Amateur and professional low frequency radio astronomy.
Mark all as read
Report group
0 selected
David Lonard
, …
Marcello Montisci
7
Jan 29
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
unread,
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
Jan 29
David Lonard
, …
John Yu
7
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
unread,
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 Sky
3
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
unread,
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
David Lonard
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
unread,
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
David Lonard
4
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
unread,
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 Sky
4
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.
unread,
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
David Lonard
3
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
unread,
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
David Lonard
2
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
unread,
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
David Lonard
4/4/22
Updated 143 MHz interferometer
Hello everyone, I made a mistake in the interpretation of some of my previous interferometer data. I
unread,
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 Dawson
14
4/1/22
VLBI !!!
I haven't tried either the USRP B210 or the BladeRF 2.0 SDR myself, but they should work. I have
unread,
VLBI !!!
I haven't tried either the USRP B210 or the BladeRF 2.0 SDR myself, but they should work. I have
4/1/22
David Lonard
2
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
unread,
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
David Lonard
2
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
unread,
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 Sky
3
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
unread,
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
David Lonard
3
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,
unread,
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 Lonard
2
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
unread,
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
unread,
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 Lonard
13
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
unread,
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
David Lonard
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
unread,
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
David Lonard
2
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
unread,
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
David Lonard
2
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,
unread,
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
David Lonard
2
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
unread,
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 Paz
4
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
unread,
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
David Lonard
6/29/21
AM radio carrier analysis
Hello everyone, I've been dabbling some more with lower frequency polarimetry and thought I would
unread,
AM radio carrier analysis
Hello everyone, I've been dabbling some more with lower frequency polarimetry and thought I would
6/29/21
David Lonard
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
unread,
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 Lonard
10
6/15/21
Introduction
David, For the rear end, I've pre-ordered the Lime SDR. I'll have the computer built long
unread,
Introduction
David, For the rear end, I've pre-ordered the Lime SDR. I'll have the computer built long
6/15/21
David Lonard
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
unread,
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.com
2
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'
unread,
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
David Lonard
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
unread,
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
David Lonard
,
Leif Johansson
5
2/24/21
C band interferometer data
On 2021-02-23 16:22, David Lonard wrote: > > Hello Leif, > > This line of code is used to
unread,
C band interferometer data
On 2021-02-23 16:22, David Lonard wrote: > > Hello Leif, > > This line of code is used to
2/24/21
David Lonard (via Google Drive)
2/23/21
C band interferometer - Invitation to collaborate
dmlo...@gmail.com has invited you to contribute to the following shared folder: C band
unread,
C band interferometer - Invitation to collaborate
dmlo...@gmail.com has invited you to contribute to the following shared folder: C band
2/23/21