Jetson Nano - Revision history

G8GKQ: /* Power Draw */

2023-02-06T17:10:46Z

Power Draw

G8GKQ: /* Software Build for the Jetson Nano (updated 3 Feb 23) */

2023-02-06T17:10:02Z

Software Build for the Jetson Nano (updated 3 Feb 23)

G8GKQ: /* Problem Solving */

2023-02-04T14:46:54Z

Problem Solving

G8GKQ: /* PTT Switching */

2023-02-04T14:45:54Z

PTT Switching

G8GKQ at 14:12, 4 February 2023

2023-02-04T14:12:37Z

G8GKQ: /* Performance */

2023-02-04T14:11:35Z

Performance

G8GKQ: /* Performance */

2023-02-04T14:10:10Z

Performance

G8GKQ at 17:09, 3 February 2023

2023-02-03T17:09:00Z

G8GKQ: /* Software Build for the Jetson Nano (updated 29 Jan 23) */

2023-02-02T20:12:52Z

Software Build for the Jetson Nano (updated 29 Jan 23)

G8GKQ: /* Problem Solving */

2023-02-02T17:17:36Z

Problem Solving

@@ Line 139: / Line 139: @@
 * CPU Frequencies at default: 0.3 - 0.6A depending on CPU & Network load
 * CPU Frequencies at max: 0.45 - 0.9A depending on CPU & Network load
-* CPU at max, LimeSDR Mini & C920 at 1MS 1080p H.265 DVB-S2 transmit: 1.8 - 1.9A
+* CPU at max, LimeSDR Mini & webcam at 1MS 1080p H.265 DVB-S2 transmit: 1.8 - 1.9A
 === GPIO ===

@@ Line 22: / Line 22: @@
 Fit the jumper link to the Nano PCB at J48 to select the use of the 2.1mm power socket, and connect the HDMI monitor, keyboard and mouse. and also a wired network connection with internet access.  The monitor, keyboard and mouse are only required during the set-up phase.
-On another computer, download the Jetson Nano Disk image from the links just under "JETSON NANO DEVELOPER KITS" on this page [https://developer.nvidia.com/jetpack-sdk-463 Jetpack SDK 4.6.3].  The direct link for the download is [https://developer.nvidia.com/embedded/l4t/r32_release_v7.1/jp_4.6.1_b110_sd_card/jeston_nano/jetson-nano-jp461-sd-card-image.zip here].  You should download a 6.4 GB file called jetson-nano-jp461-sd-card-image.zip.  Later versions of the "Jetpack" may or may not work.
+On another computer, download the Jetson Nano Disk image from the links just under "JETSON NANO DEVELOPER KITS" on this page [https://developer.nvidia.com/jetpack-sdk-463 Jetpack SDK].  The direct link for the download is [https://developer.nvidia.com/embedded/l4t/r32_release_v7.1/jp_4.6.1_b110_sd_card/jeston_nano/jetson-nano-jp461-sd-card-image.zip here]; the latest version for the Jetson Nano is 4.6.1.  You should download a 6.4 GB file called jetson-nano-jp461-sd-card-image.zip.  Later versions of the "Jetpack" may or may not work.
 Unzip the file (resulting in a 13.4 GB file called sd-blob-b01.img) and use Win32 Disk Imager or Etcher to write it to your SD Card.  No additional files are required on the card - simply insert it into the Jetson and boot up.

@@ Line 129: / Line 129: @@
 * The Pi Cam and EagleEye camera sources will not work unless a compatible USB Audio dongle is connected to the Jetson.
 * The ATEM and the Camlink 4K need to be connected to the Jetson with USB 3.1 cables (the blue connectors with the extra pins), not USB 2 cables.
-* Sometimes if the transmit selection is cancelled before the Jetson starts transmitting, the ATEM gets de-registered on the USB and is invisible to the Jetson.  This shows as a DVB-S2 lock with no service information or video.  The cure for this is to come out of transmit, recycle the power to the ATEM, pause for a few seconds and then reseklect transmit.
+* Sometimes if the transmit selection is cancelled before the Jetson starts transmitting, the ATEM gets de-registered on the USB and is invisible to the Jetson.  This shows as a DVB-S2 lock with no service information or video.  The cure for this is to come out of transmit, recycle the power to the ATEM, pause for a few seconds and then reselect transmit.
 == Hardware ==

← Older revision		Revision as of 14:45, 4 February 2023
Line 118:		Line 118:

	The Jetson GPIO pin 40 is set high when it is safe to energise the PA (after the LimeSDR calibration spike). This occurs about 15 seconds after the transmit selection. The controlling Portsdown GPIO pin 40 is also set high at about the same time. There is no PTT signal (or band switching signal) on the LimeSDR Mini GPIO connector.		The Jetson GPIO pin 40 is set high when it is safe to energise the PA (after the LimeSDR calibration spike). This occurs about 15 seconds after the transmit selection. The controlling Portsdown GPIO pin 40 is also set high at about the same time. There is no PTT signal (or band switching signal) on the LimeSDR Mini GPIO connector.
		+
		+	Note that the Jetson GPIO interface is not as robust as the Raspberry Pi GPIO and tends to latch-up if abused. It is recommended that an opto-isolator is used for isolation.

	===Problem Solving===		===Problem Solving===

@@ Line 9: / Line 9: @@
 Supported sources include:
-* ATEM Mini Pro
+* ATEM Mini Pro and ATEM Mini
 * EagleEye Mini USB Camera with (standard Portsdown) USB Mic dongle
 * Elgato Camlink 4K HDMI Dongle

@@ Line 113: / Line 113: @@
 ===Performance===
-Sadly, the Jetson is now 4 years old, and its performance has been eclipsed by modern PC cards.  The practical resolution limit for H265 333 kS FEC 2/3 is 720x1280 (720p).  For 1080p, 1 MS FEC 2/3 is required.
+Sadly, the Jetson is 2019 technology, and its performance has been eclipsed by modern PC cards.  The practical resolution limit for H265 333 kS FEC 2/3 is 720x1280 (720p).  For 1080p, 1 MS FEC 2/3 is required.  The Jetson/Lime combination struggles to transmit at more than 2 MS.
 ===PTT Switching===

← Older revision		Revision as of 14:10, 4 February 2023
Line 114:		Line 114:

	Sadly, the Jetson is now 4 years old, and its performance has been eclipsed by modern PC cards. The practical resolution limit for H265 333 kS FEC 2/3 is 720x1280 (720p). For 1080p, 1 MS FEC 2/3 is required.		Sadly, the Jetson is now 4 years old, and its performance has been eclipsed by modern PC cards. The practical resolution limit for H265 333 kS FEC 2/3 is 720x1280 (720p). For 1080p, 1 MS FEC 2/3 is required.
		+
		+	===PTT Switching===
		+
		+	The Jetson GPIO pin 40 is set high when it is safe to energise the PA (after the LimeSDR calibration spike). This occurs about 15 seconds after the transmit selection. The controlling Portsdown GPIO pin 40 is also set high at about the same time. There is no PTT signal (or band switching signal) on the LimeSDR Mini GPIO connector.

	===Problem Solving===		===Problem Solving===

@@ Line 16: / Line 16: @@
 [[File:Simple Nano.jpg|800px]]
-===Software Build for the Jetson Nano (updated 29 Jan 23)===
+===Software Build for the Jetson Nano (updated 3 Feb 23)===
 To start with, you need a Jetson Nano 4GB, a 32 GB SD Card (Sandisk Ultra 10 recommended), a 4A 5V PSU with a 2.1mm power plug, a 0.1 inch jumper, an HDMI monitor, a USB Mouse and a USB keyboard.  The 2 GB Jetson Nano might work (and will need a different SD Card Image) but has not been tested.
@@ Line 123: / Line 123: @@
 * The Pi Cam and EagleEye camera sources will not work unless a compatible USB Audio dongle is connected to the Jetson.
 * The ATEM and the Camlink 4K need to be connected to the Jetson with USB 3.1 cables (the blue connectors with the extra pins), not USB 2 cables.
 == Hardware ==

@@ Line 52: / Line 52: @@
   ./install_for_nano.sh
-If prompted to install a new version of any file, select Y.  Also, select Yes to automatically restart the Docker daemon.
+If prompted to install a new version of any file, select Y.  Also, select Yes to automatically restart the Docker daemon.  If asked whether you want to minimise the installation, say no.
 Eventually, the Jetson will reboot.  You can then disconnect the HDMI monitor, keyboard and mouse.  Connect the LimeSDR Mini to the Jetson (and the ATEM or webcam).

@@ Line 119: / Line 119: @@
 This is a complex configuration to get working.  Some pointers if it does not work for you:
-* Make sure that the Jetson 5v power supply and cabling is good enough to supply at least 5.0v to the LimeSDR Mini during transmit.  Measure this voltage on the edge connections of the LimeSDR Mini.  Lower voltages may not be reliable.
+* Make sure that the Jetson 5v power supply and cabling is good quality.  The Jetson can accept 5.25 V, so aim to give it 5.2 V at the barrel connector.  The LimeSDR Mini likes to have at least 5.0v to the LimeSDR Mini during transmit.  Measure this voltage on the edge connections of the LimeSDR Mini.  Lower voltages may not be reliable.
 * If the Jetson IP address changes, you will need to change it in the Portsdown settings '''AND''' re-approve the SSH connection from the Portsdown to the Jetson - just like you did in the set-up procedure.  Setting your router to always give the Jetson the same IP address can help prevent this.
 * The Pi Cam and EagleEye camera sources will not work unless a compatible USB Audio dongle is connected to the Jetson.