jonohudson
Member
Over on YouTube, ICAS enterprises have posted a video demonstrating “Signal Adaption” using an RSPduo. This is one of the new capabilities offered by a Dual-Tuner SDR and is a good example of the kind of feature SDRplay will be adding to their own SDRuno software in a future release.
This experimental setup used SDRuno and Linrad software with RSPduo hardware to receive a weak Japanese beacon, and then inject an interfering signal, which could be removed. The Linrad software provided the Signal Adaption. Signal Adaption can either combine the wanted signals on both antennas to improve S/N, or it can be used to cancel out an unwanted signal.
The accompanying notes from the video read as follows:
“RSPduo/SDRunoを使用したノイズキャンセルの実験です。 This video shows an noise canceling experiment using RSPduo and Linrad in combination. 詳細は、下記URLを御覧ください。 Please refer to the following URLs for details...”
There are then two links to Japanese description which we have translated into English using Google translate:
Settings: https://www.sdrplay.com/wp-content/uploads/2018/06/Linrad-demo-by-ICAS-Enterprises-Part-1.pdf
Operation: https://www.sdrplay.com/wp-content/uploads/2018/06/Linrad-demo-by-ICAS-Enterprises-Part-2.pdf
The YouTube video is here: https://youtu.be/o5-jLNAn-1s
Other details of the set-up are understood to be as follows:
Settings of RSPduo/SDRuno:
-Tuned to the same freq with the same LO (listening to a 50MHz beacon.) -Assigned Ant 1 to instance 0, and Ant 2 to instance 1 -Fed to Linrad using the VBA cable – L and R
Settings for Linrad:
-0 deg: receiving with Ant 1
-90 deg: receiving with Ant 2
-injected an artificial QRM using VNWA signal generator -Adaptation is enabled.
-Clicking “O” on Linrad shifts the phase 90 degrees and the artificial signal disappears
Linrad, authored by SM5BSZ, is available as Windows software from Linrad home page. Download Linrad or update Linrad here.
Yas at ICAS also noted: We do not have to use a hardware 90 deg shifter. I just used an LZ1AQ loop and a discone. Linrad has a capability to enhance the combined signal (adaptation) to the maximum (both antennas combined), which is set as the origin, while “O” button on Linrad shifts the phase by 90 degrees from the origin where the maximum signal at 0 degrees gets offset (namely, gone).
We are grateful to channel partner SDR-Kits https://www.sdr-kits.net/ who worked closely on this with ICAS Enterprises and who also supplied the VNWA
We hope to write this up more fully as an application note. But meanwhile it is a good indication of the promising new capabilities provided by the RSPduo - perfect for tough DXing conditions
This experimental setup used SDRuno and Linrad software with RSPduo hardware to receive a weak Japanese beacon, and then inject an interfering signal, which could be removed. The Linrad software provided the Signal Adaption. Signal Adaption can either combine the wanted signals on both antennas to improve S/N, or it can be used to cancel out an unwanted signal.
The accompanying notes from the video read as follows:
“RSPduo/SDRunoを使用したノイズキャンセルの実験です。 This video shows an noise canceling experiment using RSPduo and Linrad in combination. 詳細は、下記URLを御覧ください。 Please refer to the following URLs for details...”
There are then two links to Japanese description which we have translated into English using Google translate:
Settings: https://www.sdrplay.com/wp-content/uploads/2018/06/Linrad-demo-by-ICAS-Enterprises-Part-1.pdf
Operation: https://www.sdrplay.com/wp-content/uploads/2018/06/Linrad-demo-by-ICAS-Enterprises-Part-2.pdf
The YouTube video is here: https://youtu.be/o5-jLNAn-1s
Other details of the set-up are understood to be as follows:
Settings of RSPduo/SDRuno:
-Tuned to the same freq with the same LO (listening to a 50MHz beacon.) -Assigned Ant 1 to instance 0, and Ant 2 to instance 1 -Fed to Linrad using the VBA cable – L and R
Settings for Linrad:
-0 deg: receiving with Ant 1
-90 deg: receiving with Ant 2
-injected an artificial QRM using VNWA signal generator -Adaptation is enabled.
-Clicking “O” on Linrad shifts the phase 90 degrees and the artificial signal disappears
Linrad, authored by SM5BSZ, is available as Windows software from Linrad home page. Download Linrad or update Linrad here.
Yas at ICAS also noted: We do not have to use a hardware 90 deg shifter. I just used an LZ1AQ loop and a discone. Linrad has a capability to enhance the combined signal (adaptation) to the maximum (both antennas combined), which is set as the origin, while “O” button on Linrad shifts the phase by 90 degrees from the origin where the maximum signal at 0 degrees gets offset (namely, gone).
We are grateful to channel partner SDR-Kits https://www.sdr-kits.net/ who worked closely on this with ICAS Enterprises and who also supplied the VNWA
We hope to write this up more fully as an application note. But meanwhile it is a good indication of the promising new capabilities provided by the RSPduo - perfect for tough DXing conditions
