RSP and HL2+

What SDR program works best with RaspberryPi-4? I have a Mac and use SparkSDR which works, but I think is limited.?

73,

Craig?

Southeastern VHF Conference?2025 Announcement &?Call For Papers

Quality Inn, 3095 Wilma Rudolph Blvd, Clarksville, TN 37040
April 4th and 5th, 2025

Papers and presentations are solicited on both the technical and operational?aspects of VHF, UHF and Microwave weak signal amateur radio. Some suggested areas of interest are:
? Transmitters, Receivers, Transverters
? RF Power Amplifiers, RF Low Noise Preamplifiers
? Antennas
? Construction Projects
? Test Equipment and Station Accessories
? Station Design and Construction
? Contesting, Roving, DX-peditions
? EME, Propagation (Sporadic E, Meteor Scatter, Troposphere Ducting, etc.)
? Digital Modes, Digital Signal Processing (DSP), Software Defined Radio
??(SDR) Amateur Satellites, Amateur Television

In general papers and presentations on non-weak signal related topics such?as FM repeaters and?packet will not be accepted but exceptions may be made?if the topic is related to weak signal. For example, a paper or presentation on?the use of FM simplex in contests or on the use of APRS to track rovers?during contests would be considered.

?

Formats:

All submissions for?publication in the proceedings should be in Microsoft Word (.doc or?.docx) formats. Submissions for presentation at the conference?should be in Microsoft PowerPoint (.ppt or .pptx) format and?delivered at the conference on a USB memory stick. Please?understand that your PowerPoint Slide presentation will not be?accepted to be published in the proceedings; only meaningful text?will be published in the proceedings, not slides that need?description for understanding.
Paper: Size should be?81?2 x 11-inches.
Margins: Top and sides should be 0.75 inches; bottom must be 1?inch.
Font: You may choose your font, however, try and use standard?fonts. The font should be clean and easy to read?12 pt.
Layout: Either a one or two-column format.
Page numbers: Do not include page numbers.
Headers/Footers: Do not include Headers and/or Footers.
Drawings: Drawings should be embedded in the files. Place them?where you’d like them to appear.
Photos: Color or black-and-white digital images if utilized should be?embedded in text files. Place them where you’d like them to appear.
Printing: We print what we receive. We do not copy edit (but will?correct something if we notice it – or if you notice it and let us know).

We try to make all papers somewhat uniform, but we do not rework?each article. Page numbers are added as we prepare the files for our
printer.?

The deadline for the submission of papers and presentations?is February 15, 2025.?

Please indicate when you submit your paper?or presentation if you plan to attend the conference and present?your paper in person or if you are submitting solely for publication.

Papers and presentations are being handled by Mike Stipick,?KC4RI,?and should be sent to:?KCRI@ATT.net. Mike may be contacted at the same email address if you have any questions.

All Electronics former employees now operate Aretronics

#15905

The former employees of All Electronics have formed a new electronic surplus store called Aretronics:?

Re: Winlink + VARA on Pi 5 tests

#15904

开云体育

Thank you Pete, I hope that will be fixed.

73, Denis

On 1/13/2025 11:58 PM, Peter VK3PYE via groups.io wrote:

Show quoted text

Denis, looks like this has been reported as an "issue" on the Wheezy Github site -- ..? "Vara HF PTT issue #91", but no reply from "Mr Wheezy" as yet.

?

I had a look at what the ports were doing, and when I had an RMS Exress / Ardop session going, ports 8200 & 8201 were in LISTENING mode, which is what they suppose to be doing it seems ...

?

Then I opened an RMS Express / VARA session and the VARA ports 8300 &? 8301 were not showing, so that seems to be the issue -- the ports that VARA tries to use do not open.

?

-----

73 de Pete VK3PYE

Re: Winlink + VARA on Pi 5 tests

#15903

Denis, looks like this has been reported as an "issue" on the Wheezy Github site -- "https://github.com/WheezyE/Winelink/issues/91" ..? "Vara HF PTT issue #91", but no reply from "Mr Wheezy" as yet.

?

I had a look at what the ports were doing, and when I had an RMS Exress / Ardop session going, ports 8200 & 8201 were in LISTENING mode, which is what they suppose to be doing it seems ...

?

Then I opened an RMS Express / VARA session and the VARA ports 8300 &? 8301 were not showing, so that seems to be the issue -- the ports that VARA tries to use do not open.

?

-----

73 de Pete VK3PYE

Re: Winlink + VARA on Pi 5 tests

#15902

开云体育

Thanks Pete, If I find anything I will let you know.

73, Denis

On 1/12/2025 4:13 PM, Peter VK3PYE via groups.io wrote:

Show quoted text

Hi Denis.

?

On the 64bit OS, I had a look at VARA's log and it tells me that it is not communicating with any apps on port 8300.? That is strange, as the RMS - VARA HF session can see VARA on port 8300. But it does explain why RMS Express can not see my registration.

?

?

Yesterday (12JAN2025) I installed the 32bit Bookworm OS on the Pi5 and got RMS Express and VARA working, but it is much buggier on the 32bit. I used Pi-Apps to get VARA? installed then installed RMS Express manually.

?

?I will keep you posted if i can find out what's going on.

-----

73 de Pete VK3PYE

Re: Winlink + VARA on Pi 5 tests

#15901

Hi Denis.

?

On the 64bit OS, I had a look at VARA's log and it tells me that it is not communicating with any apps on port 8300.? That is strange, as the RMS - VARA HF session can see VARA on port 8300. But it does explain why RMS Express can not see my registration.

?

Yesterday (12JAN2025) I installed the 32bit Bookworm OS on the Pi5 and got RMS Express and VARA working, but it is much buggier on the 32bit. I used Pi-Apps to get VARA? installed then installed RMS Express manually.

?

?I will keep you posted if i can find out what's going on.

-----

73 de Pete VK3PYE

Re: Winlink + VARA on Pi 5 tests

#15900

开云体育

Hi Pete,?

I am having the same problem running pi5 RMS Express/VARA and VarAC/VARA and APRIS32/VARA.

73, Denis

WB8SKP

On 1/11/2025 10:12 PM, Peter VK3PYE via groups.io wrote:

Show quoted text

On Sun, Feb 4, 2024 at 11:53 PM, Kenneth R. van Wyk wrote:

I got things running. (The version of Box64 was really important.)

Hi Ken and all ...

?

I am having issues getting PTT to work with VARA HF ....

?

My Pi5 has the latest (11JAN2025) 64bit Bookworm installed, with Pi-Apps and that is about all. It is all running on a 64Gb micro-sd-card.

?

So I had a go at installing the latest edition of "Winelink - RMS Express - VARA" from the command line. The install went well.

I have setup RMS Express with my credentials, and setup VARA HF with my licence details.?

?

But,?I can not get an RMS Express / VARA HF Winlink session to trigger the PTT in the VARA modem.

RMS Express with an Ardop session works fine. PTT is OK with that, but VARA is a non event.

?

One thing that may be related, is that RMS Express is not recognizing my VARA licence.

?

I have also tried VarAC v10.2.1 on the Pi5, but it also refuses to activate the PTT for a 'beacon' session.? If I click on the "tune" button in VarAC, it also tells me that my VARA is not licenced.

But, in the setup section of VarAC, where you get to test your COM setup, PTT works! So, that is promising.?

??

I have been using RMS Express / VARA successfully for sometime now with Windoze10, so I do know how to set it up properly.? I even have an RMS Express / VARA HF setup running fine on one of my Pi4s using a BAP3 version of KM4ACK's? 32bit software.

?

So, any ideas of what may be preventing the PTT function in VARA would be welcome.

?

-----

73 de Pete VK3PYE

Re: Winlink + VARA on Pi 5 tests

#15899

On Sun, Feb 4, 2024 at 11:53 PM, Kenneth R. van Wyk wrote:

I got things running. (The version of Box64 was really important.)

Hi Ken and all ...

?

I am having issues getting PTT to work with VARA HF ....

?

My Pi5 has the latest (11JAN2025) 64bit Bookworm installed, with Pi-Apps and that is about all. It is all running on a 64Gb micro-sd-card.

?

So I had a go at installing the latest edition of "Winelink - RMS Express - VARA" from the command line. The install went well.

I have setup RMS Express with my credentials, and setup VARA HF with my licence details.?

?

But,?I can not get an RMS Express / VARA HF Winlink session to trigger the PTT in the VARA modem.

RMS Express with an Ardop session works fine. PTT is OK with that, but VARA is a non event.

?

One thing that may be related, is that RMS Express is not recognizing my VARA licence.

?

I have also tried VarAC v10.2.1 on the Pi5, but it also refuses to activate the PTT for a 'beacon' session.? If I click on the "tune" button in VarAC, it also tells me that my VARA is not licenced.

But, in the setup section of VarAC, where you get to test your COM setup, PTT works! So, that is promising.?

??

I have been using RMS Express / VARA successfully for sometime now with Windoze10, so I do know how to set it up properly.? I even have an RMS Express / VARA HF setup running fine on one of my Pi4s using a BAP3 version of KM4ACK's? 32bit software.

?

So, any ideas of what may be preventing the PTT function in VARA would be welcome.

?

-----

73 de Pete VK3PYE

Re: Has anyone used a Raspberry Pi to run Slow Scan Television

#15898

Hi there,?

?

I've been running a Raspi 4 with QSSTV and a Signal link to a TS-50 for the past four days, testing it, and it's working FB. I also used it for the ISS event, and it worked fine, too. For the OS, I'm running Ubuntu 24.04 LTS.

Jason, WV3V

node-red-confit-remote

#15897

node-red-contrib-remote had been working perfectly. I had to rebuild my Raspberry PI OS after it became corrupted. I reinstalled node-red. I imported the latest of my flows. Remote-access node indicated Configuration From Backup. When I clicked on the button "Connect Node-RED app" the QR code would not appear, instead I received the following error message "Error while registering app: Request failed with status code 400 / Missing parameters. I believe I had been following the author's instructions to delete and reinstall the node. I also checked the latest remote-config and the data appears to be correct. I have tried this on two different Win11 systems to no avail. Any suggestions about what to do?

Re: RPi Kernel Panic on Bookworm

#15896

? Hi David,

?

Sorry, I didn't see your response until just now. ?While the bug isn't specific to ax25d, it does relate to freeing kernel resources and cleaning up after a received (inbound) connection has terminated. ?If you were to have a packet service that does all of its own socket code, then it would likely still be affected. ?However, since packet apps like rmsgw and node leave the socket code to ax25d, in practical terms, the bug only presents itself when running ax25d.

?

? Cheers

? Mike

Re: Low voltage solution +WARNING+

#15895

Maybe the cap is defective. I’m no expert but it sounds like it’s pulling too much current, for some reason. You should setup an amp meter to find out how many amps are going through it

?

73,

Robert, AG6LK

Re: Low voltage solution +WARNING+

#15894

开云体育

WARNING
+++++++
I purchased three of these (see URL below) a few weeks ago. Perhaps I received a faulty batch but all three of them performed the same.

On a 'soak test' with an input of 14.2v and a 1R load on the 5v output. The 100uF 50v wkg capacitor next to the input terminals reached such a high temperature that I received a blister to my finger when I picked up the board. This was only after the unit had been supplying power for a few minutes. I doubt the capacitor will last for long before failing, perhaps causing the demise of the powered equipment.

I dont have a means of measuring the temperature it reached but it was hotter than my Weller soldering iron tip. I assume that this is caused by the current flowing through the cap, because 14.2v across a 50v cap should'nt get vaguely warm. The other 100uF 50v cap on the board was relatively cool, having only been heated by the dissipation of the silicone devices on the board.

Your experience may be different, but I would recommend a soak test before committing this board to use.

hth, Mike G8NXD

On 09/11/2024 13:15, Kevin Gray via groups.io wrote:

Show quoted text

?

?

Note: Input different voltage will output different power: input DC 9-24V, output 5.2V/6A/30W; input DC 24-32V, output 5.2V/5A/25W; input DC 32-36V, output 5.2V/3.5A/18W.

Re: Low voltage solution

#15893

That fast charging cable says it is only good to 3.1 amps

"[3.1A Fast Charging]: Supports safe high-speed charging at 3.1A and data syncing speeds up to (480Mb/s). The 56kΩ resistor provides outstandingly reliable conductivity & stability, protecting your devices and charging adapters from damage."

Get

N0YWB via groups.io wrote:

Show quoted text

The Raspberry Pi will deliver an "Under-voltage" warning when operating below 4.63 volts, as measured at GPIO pin 2 or 4. In Raspian OS, a lightning bolt appears in the upper right corner of the display.??In Raspberry Pi OS, a "Low voltage warning" text appears in the display upper right corner.??"Under-voltage detected!" is also logged in dmesg for each occurance.

?

Often the cause is too much voltage drop in a poor USB power cable. I have taken apart flimsy USB cables where the wires were not soldered and relied upon the rubber molding to contact the pins.

USE A BEEFY USB CHARGING CABLE designed to fast charge smart phones and laptops.

$5 USB A to C

$6 USB-C to C

?

To see what the Raspberry Pi internally measures on the 5V input, enter on the terminal:

? vcgencmd pmic_read_adc | grep EXT5V_V

You will be surprised at the voltage drop in most USB supply cables!

?

With all USB loads attached, enter in the terminal:

?dmesg | grep Under-voltage

To see if "Under-voltage" is occurring.

??

I have used these to successfully power my RPi5 with NVMe SSD:

$13 YIPIN HEXHA 10-32V DC in to 5.2V 6A dual USB-C

$10 Klnuoxj 8-32V to 5V. 5A. USB-C PD Converter.

?

The RPi5 will run fine with 3A or more at 5V, if there is no USB load, but a 5A 5.2V supply is recommended to draw the maximum 1.6A from the USB ports.

?

The USB-C Power Delivery 3.0 standard specifies 5 volts at 3.0 amperes, but the PD protocol allows for requesting higher current. The Raspberry Pi 5 wall wart acknowledges a PD request for 5 amperes. Normally, the RPi5 is configured to use USB-C Power Delivery (PD) protocol,

to negotiate 5A from the PD capable Raspberry Pi 5.1 volt mains power adapter, and shuts down if it fails to get PD acknowledgement that 5 A is available.

?

Add a line to the config.txt of the Raspberry Pi to ignore the USB Power Delivery communication and assume that the power supply can provide 5v and 5A.

sudo rpi-eeprom-config –editThen add the line:
 PSU_MAX_CURRENT=5000 
Or add the following to the end of //firmware/:

usb_max_current_enable=1

Zero if the USB port current limiter was set to the low-limit during boot, non-zero if the high limit was enabled.? Enabled if the USB Power Delivery (PD) supply claims 5A max-current OR if forced in config.txt

?

Forcing the RPi5 boot to ignore Power delivery will allow many 5.2 volt non-PD USB power adapters and automotive USB outlets to power the RPi5.

Re: Low voltage solution

#15892

The Raspberry Pi will deliver an "Under-voltage" warning when operating below 4.63 volts, as measured at GPIO pin 2 or 4. In Raspian OS, a lightning bolt appears in the upper right corner of the display.??In Raspberry Pi OS, a "Low voltage warning" text appears in the display upper right corner.??"Under-voltage detected!" is also logged in dmesg for each occurance.

?

Often the cause is too much voltage drop in a poor USB power cable. I have taken apart flimsy USB cables where the wires were not soldered and relied upon the rubber molding to contact the pins.

USE A BEEFY USB CHARGING CABLE designed to fast charge smart phones and laptops.

$5 USB A to C

$6 USB-C to C

?

To see what the Raspberry Pi internally measures on the 5V input, enter on the terminal:

? vcgencmd pmic_read_adc | grep EXT5V_V

You will be surprised at the voltage drop in most USB supply cables!

?

With all USB loads attached, enter in the terminal:

?dmesg | grep Under-voltage

To see if "Under-voltage" is occurring.

??

I have used these to successfully power my RPi5 with NVMe SSD:

$13 YIPIN HEXHA 10-32V DC in to 5.2V 6A dual USB-C

$10 Klnuoxj 8-32V to 5V. 5A. USB-C PD Converter.

?

The RPi5 will run fine with 3A or more at 5V, if there is no USB load, but a 5A 5.2V supply is recommended to draw the maximum 1.6A from the USB ports.

?

The USB-C Power Delivery 3.0 standard specifies 5 volts at 3.0 amperes, but the PD protocol allows for requesting higher current. The Raspberry Pi 5 wall wart acknowledges a PD request for 5 amperes. Normally, the RPi5 is configured to use USB-C Power Delivery (PD) protocol,

to negotiate 5A from the PD capable Raspberry Pi 5.1 volt mains power adapter, and shuts down if it fails to get PD acknowledgement that 5 A is available.

?

Add a line to the config.txt of the Raspberry Pi to ignore the USB Power Delivery communication and assume that the power supply can provide 5v and 5A.

sudo rpi-eeprom-config –editThen add the line:

 PSU_MAX_CURRENT=5000

Or add the following to the end of //firmware/:

usb_max_current_enable=1

Zero if the USB port current limiter was set to the low-limit during boot, non-zero if the high limit was enabled.? Enabled if the USB Power Delivery (PD) supply claims 5A max-current OR if forced in config.txt

?

Forcing the RPi5 boot to ignore Power delivery will allow many 5.2 volt non-PD USB power adapters and automotive USB outlets to power the RPi5.

Re: Low voltage solution

#15891

?

Note: Input different voltage will output different power: input DC 9-24V, output 5.2V/6A/30W; input DC 24-32V, output 5.2V/5A/25W; input DC 32-36V, output 5.2V/3.5A/18W.

Re: Low voltage solution

#15890

Sorry, don't have the details. I bought a 10 pack of them 4 or 5 years
ago. I'm powering some weather radios, a couple Pi-Zeros, and a few
other devices that take random voltage inputs. I think I have one Pi3
using them. Don't have any Pi4 or Pi5 devices. Still doesn't make sense
to me why they insist on continuing to power them via USB sockets.
Utilizing a 12V input is much more robust and almost as universal, much
more versatile, and the hardware and engineering differences are trivial.

Michael WA7SKG

Kirby, KL7VK wrote on 11/6/24 11:32 AM:

Show quoted text

Michael, which Buck Converters did you purchase? Will they handle 3
and/or 5 a? I have purchased B converters from Amazon but they provide
either 2 or 3 amps. The RPI 5 likes 5A. RPI 4 likes 3A.
73,
Kirby
KL7VK

Re: Low voltage solution

#15889

I was running 2 Pi5's of of one of these without issues. Now that I have a 24 port router with POE+ on all ports, it's been moved back to my project bench

12A Buck Converter DC 24V to 5V... https://www.amazon.com/dp/B09MVH3YN6?ref=ppx_pop_mob_ap_share

Get

Kirby, KL7VK via groups.io wrote:

Show quoted text

Michael, which Buck Converters did you purchase? Will they handle 3 and/or 5 a? I have purchased B converters from Amazon but they provide either 2 or 3 amps. The RPI 5 likes 5A. RPI 4 likes 3A.

?

73,

Kirby

KL7VK

Re: Low voltage solution

#15888

Michael, which Buck Converters did you purchase? Will they handle 3 and/or 5 a? I have purchased B converters from Amazon but they provide either 2 or 3 amps. The RPI 5 likes 5A. RPI 4 likes 3A.

?

73,

Kirby

KL7VK