Re: Quality USB-A to USB-C cable to avoid voltage drop
Those are prone to spuriously emit. 73
They're available on ebay for similar prices.
Here's an example:
On Tue, Jul 13, 2021 at 2:41 PM Tadd KA2DEW in NC via <tadd= [email protected]> wrote: I’m not sure there is NO noise, but there are 40 of them in use in our data network and I’ve heard no complaints. ? They are $15 from Amazon?
and $40 for 10 of them from Alibaba.?
But I can’t figure out how to send Alibaba money.? The web page is always broken in some way late in the purchase. ?
Can anybody buy from these people?? ? ?Tadd
We see linear supplies that waste half the power as heat and smps supplies that raise the noise floor noticeably.
Can you detect any noise from the DROK? Their website isn't very technical. Amazon is famous for selling EMI plagued devices. 73 The acid test for all this is whether the Raspberry PI complains about under-volt.? If the PI doesn’t complain, EVER, you are probably in great shape. ?
Measuring the voltage at the PI makes sense.? Measuring the current doesn’t help much since the PI will draw what it draws. I don’t think longer cables change how much current the Raspberry PI needs and a bigger power supply on the source end won’t change the current the Raspberry PI needs. ?
My solution is to use a 5.2v regulator and a six inch cable to the USB-c plug.? There are a host of inexpensive (< $20) variable output, 8v to 37v input, adjustable output supplies out in the world.? DROK makes a good one which actually has a variable voltage output into a USB-A socket and that’s the one our local radio club uses.? We like that the PI comes on when the radios are powered up.? Having the PI powered up whenever the radios are on is a good thing.? Having the radios powered and the PI not powered can be bad because voltage enough to start up some of the PI’s peripherals can show up on connections between the radios and those peripherals.? So if the PI is powered down and the radios are up, you can get bad glitches in the peripherals. ?
The point is, you need 5.2v at the Raspberry PI.? You can measure the voltage at the 40-pin AUX connector.? Wires drop voltage when the current draw is > 0.? Longer wires drop more voltage and higher current draw causes more voltage drop.? Thinner wires also cause higher voltage drop. ? So, ?if you have a voltage need, and a current need, and length of wire you want to keep the voltage high enough, the length short enough and the wire thick enough. ?
? ?Tadd
On Jul 12, 2021, at 10:15 PM, dwfunk4475 < dwfunk@...> wrote:
Measure the voltage and current at your Pi, don't guess.?
And FYI, power supplies according to? require 5.1 volts.
-david On Mon, Jul 12, 2021, 16:15 Jeremy Utley < jerutley@...> wrote: Hi all in the group! ? Been doing lots of Google searches, and while years ago I found this kind of info for the old micro-USB cables, I haven’t found similar information for USB-C – and I figure the Pi Ham Radio group is my best bet. ? I’ve got a Pi-4 8GB model, with an Argon One M.2 case and Samsung SSD as the boot device.? I’m building out this device for portable logging/digital mode usage when I’m on POTA activations – either by VNC from a tablet, or a small portable screen mounted in my radio case. ? So the problem I have is with voltage drop – I power the Pi via a PowerWerx USB-Buddy – which provides 5v DC @ 3A, connected to a Bioenno LiFePo4 battery.? In my testing here at home, using a 1ft long USB-A to USB-C cable, it works without any problems.? But, I wanted a longer cable, so I went to a 3ft cable from the same maker.? Once I used that cable, I was immediately getting low voltage warnings – so obviously I’m getting voltage drop on the longer cable.? But I’m having trouble finding heavier USB-A to USB-C cables to avoid voltage drop across that length. ? Anybody have knowledge of any good cables that fit the bill??? ? Thanks! ? Jeremy, NQ0M
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Re: Quality USB-A to USB-C cable to avoid voltage drop
Jeremy,?
I am useing the Buddipole powermini 2?
It has a usb out put of 5.2v 4amp . It is not cheap but it works great with a solar panel keeps battery charged and have power pole connectors is good to. Works with both lithium ion ,and sla batterys
John kj4wsr
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Re: Quality USB-A to USB-C cable to avoid voltage drop
They're available on ebay for similar prices.
Here's an example:
On Tue, Jul 13, 2021 at 2:41 PM Tadd KA2DEW in NC via <tadd= [email protected]> wrote: I’m not sure there is NO noise, but there are 40 of them in use in our data network and I’ve heard no complaints. ? They are $15 from Amazon?
and $40 for 10 of them from Alibaba.?
But I can’t figure out how to send Alibaba money.? The web page is always broken in some way late in the purchase. ?
Can anybody buy from these people?? ? ?Tadd
We see linear supplies that waste half the power as heat and smps supplies that raise the noise floor noticeably.
Can you detect any noise from the DROK? Their website isn't very technical. Amazon is famous for selling EMI plagued devices. 73 The acid test for all this is whether the Raspberry PI complains about under-volt.? If the PI doesn’t complain, EVER, you are probably in great shape. ?
Measuring the voltage at the PI makes sense.? Measuring the current doesn’t help much since the PI will draw what it draws. I don’t think longer cables change how much current the Raspberry PI needs and a bigger power supply on the source end won’t change the current the Raspberry PI needs. ?
My solution is to use a 5.2v regulator and a six inch cable to the USB-c plug.? There are a host of inexpensive (< $20) variable output, 8v to 37v input, adjustable output supplies out in the world.? DROK makes a good one which actually has a variable voltage output into a USB-A socket and that’s the one our local radio club uses.? We like that the PI comes on when the radios are powered up.? Having the PI powered up whenever the radios are on is a good thing.? Having the radios powered and the PI not powered can be bad because voltage enough to start up some of the PI’s peripherals can show up on connections between the radios and those peripherals.? So if the PI is powered down and the radios are up, you can get bad glitches in the peripherals. ?
The point is, you need 5.2v at the Raspberry PI.? You can measure the voltage at the 40-pin AUX connector.? Wires drop voltage when the current draw is > 0.? Longer wires drop more voltage and higher current draw causes more voltage drop.? Thinner wires also cause higher voltage drop. ? So, ?if you have a voltage need, and a current need, and length of wire you want to keep the voltage high enough, the length short enough and the wire thick enough. ?
? ?Tadd
On Jul 12, 2021, at 10:15 PM, dwfunk4475 < dwfunk@...> wrote:
Measure the voltage and current at your Pi, don't guess.?
And FYI, power supplies according to? require 5.1 volts.
-david On Mon, Jul 12, 2021, 16:15 Jeremy Utley < jerutley@...> wrote: Hi all in the group! ? Been doing lots of Google searches, and while years ago I found this kind of info for the old micro-USB cables, I haven’t found similar information for USB-C – and I figure the Pi Ham Radio group is my best bet. ? I’ve got a Pi-4 8GB model, with an Argon One M.2 case and Samsung SSD as the boot device.? I’m building out this device for portable logging/digital mode usage when I’m on POTA activations – either by VNC from a tablet, or a small portable screen mounted in my radio case. ? So the problem I have is with voltage drop – I power the Pi via a PowerWerx USB-Buddy – which provides 5v DC @ 3A, connected to a Bioenno LiFePo4 battery.? In my testing here at home, using a 1ft long USB-A to USB-C cable, it works without any problems.? But, I wanted a longer cable, so I went to a 3ft cable from the same maker.? Once I used that cable, I was immediately getting low voltage warnings – so obviously I’m getting voltage drop on the longer cable.? But I’m having trouble finding heavier USB-A to USB-C cables to avoid voltage drop across that length. ? Anybody have knowledge of any good cables that fit the bill??? ? Thanks! ? Jeremy, NQ0M
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FYI...The "Mute This Topic" function works well for those that consume the group via email.? There is also a "Mute This Topic" button for each topic when accessing conversations on the groups.io website.? Neither button, however, will mute topics for those that consume the material on the groups.io website.
73, Andy
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Re: Quality USB-A to USB-C cable to avoid voltage drop
Anker cables have proven to me to be the best at effectively transferring the power you are paying for. ?They simply wirk.
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Re: MiniProSC sound card info for BAP 3.0.8
I have added the CAT cable and have carefully watched Julian’s G90 Digital Modes Setup and I finally figured it out. ?FLRIG is your friend. Additionally, ?watching what nondescript audio codec he selected, and locating it among the 20+ options, I was finally able to get full access to my radio and digital modes through my RaspberryPi. ?The proper audio selection is: ?plughw:CARD=CODEC,dev=0
Once selected, my MiniPro worked like a champ and digital modes are ready to go!
Thank you Julian, OH8STN.
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Hi John Raspberry Pi 4 comes with Python 3 which is an upgrade from Python 2. The Pi is a great platform to get started with Python
My Raspberry pi 400 came with a nice book, the "Official Rasberry Pi Beginner's Guide, 4th Edition". In Chapter 6, "physical computing with Scratch and Python", pg 131 they have a paragraph that
discusses how to use the GPIO pins from Python. You will need a library called GPIO Zero.
you can install it with "sudo pip install gpiozero" if you are not already superuser.
has a example of how to use it.
You might also want to look at "Getting Started with MicroPython on Raspberry Pi Pico". The PI Pico sells for $4 from but you will also need to get 20 pin "headers" and solder them. Look at the pico link above to find the documentation.
I like buying from adafruit but it was a shock to me to find I needed pins
(and that I needed to solder the pins onto a "breadboard" )
to be able to easily attach wires and devices to actually manipulate hardware.
MicroPython is a version of python that makes programming the hardware a little easier.
CircuitPython comes from Adafruit and is based on MicroPython which can run natively on the Pi Pico.
There is lots of stuff to learn to be able to master programming python for a ham project.
What a splendid adventure lies ahead for you!
73
Paul Campbell KE7YK Bellingham, WA
On Fri, Aug 20, 2021 at 7:03 AM John < radio@...> wrote: Attempting to learn Python3 programming for a ham project.??
Will it run on Raspberry Pi4b?
If so, will it run well?
John,? W0GN
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It works as well as any other Python on any other computer.?
Mark? KD0QYN?
On Fri, Aug 20, 2021 at 9:03 AM, John <radio@...> wrote: Attempting to learn Python3 programming for a ham project.??
Will it run on Raspberry Pi4b?
If so, will it run well?
John,? W0GN
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Yes On 20/08/2021 10:03 John <radio@...> wrote:
Attempting to learn Python3 programming for a ham project.
Will it run on Raspberry Pi4b?
If so, will it run well?
John, W0GN
Nigel A. Gunn, ///shoulders.outwards.resolutions tel +1-937-971-0366 Amateur Radio G8IFF W8IFF and GMRS WRBV701, e-mail nigel@... www
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Attempting to learn Python3 programming for a ham project.??
Will it run on Raspberry Pi4b?
If so, will it run well?
John,? W0GN
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Re: MiniProSC sound card info for BAP 3.0.8
Thanks Dave, I’ll try that when I get back to my rig. ?I, too, was trying to replicate Julian’s set-up and having no luck. ?Again, thanks.
I appreciate all the help that referred me to the MiniPro information on how to set it up with Windows, however, Raspberry Pi is not running Windows and I do have all of the MiniPro info.
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Re: MiniProSC sound card info for BAP 3.0.8
I use a Digirig interface for my G 90. () when I get a chance to go portable. I have had to use the blue USB vfo control in the past when USB ports got messed up.?
73 Don Poaps
New Westminster, BC
VA7DGP DATA VA7QU ? VOICE Winlink: va7qu@...
Subject://wl2k ? ? ? ? ? ALLSTAR ?530780 HH# 5971 HH# 11384 Alberta Mesh# 5404
? ? ? ? ? ? ? ? ? ?
On Wed, Aug 18, 2021 at 3:12 PM David AJ6RE < dc1@...> wrote: Hi Dinoburb,
Just to clarify, you should add a CAT cable and then you will see the USB inputs you are looking for in FLRIG.
73
David
AJ6RE
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Re: Micropython I2S audio library?
Maybe this ?blog post (?helps.
73
Armin, DJ2AG
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I finally got Hampi back up and running today. Actually, it's Version 2.0 now, so at least I got a fresh upgrade for my trouble.
The issue was with the original SanDisk card, which apparently got damaged or corrupted at some point. I re-flashed it along with a new card at the same time for comparison. When I inserted the original card into the reader on the Ubuntu laptop it would hang for about 5 minutes on each of the partitions when I selected them before displaying their contents. The new SD card displayed its contents instantly.?
What I had believed to be a problem with the second card was not. First, I was unaware that the SD could be overwritten by Linux such that its files become invisible to Windows File Explorer, so what I had assumed was a wiped second card was not. Second, I was unable to access the second card on the Rpi via VNC because I first needed to disable the Hampi's autohotspot service which was preventing VNC from connecting to my LAN.?
Anyway, thanks again to you all for your help.?
73's,
David
AJ6RE
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Re: MiniProSC sound card info for BAP 3.0.8
Hi Dinoburb,
Just to clarify, you should add a CAT cable and then you will see the USB inputs you are looking for in FLRIG.
73
David
AJ6RE
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Re: MiniProSC sound card info for BAP 3.0.8
Hi Dinoburb,
I had the same experience, with the exact same configuration: G90, MiniProSC, Rpi mobile. I did the same thing, trying to emulate Julian's setup. In the end it turned out the addition of the CAT cable (USB) between the G90 and the Rpi was necessary. I was pulling my hair out for about 2 weeks until I figured that out.
Good luck!
73's
David
AJ6RE
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Consider using two TNCs? One for 1200 and one for 9600? NinoTNC does both speeds and is only $30, build it yourself.
toggle quoted message
Show quoted text
On Aug 18, 2021, at 5:11 PM, Don Ritchie <dritchie@...> wrote:
I'm not even sure that this is the correct group to ask this.
we are looking for a tnc that can "switch" itself from 1200 to 9600 baud.
we know that the Kantronics 9612 ex can, but I don't really want to
spend that kind of money.
an unattended digiapeater that will digirepeat whatever it gets would be
the answer.
I also am not sure I understand the difference between G3RUH and GMSK
9600 ??
Thanks
Don, K8ZGW
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The TNC-Pi9k6 is dual mode, and can switch modes with a few simple commands.? However, the radio is another problem, switching from 1200 to 9600 baud.
The latest PiGate software switches the TNC mode for you (if you have a TNC-Pi9k6 mounted), depending upon what RMS station you have selected for polling.
Mark KD0QYN
On Wednesday, August 18, 2021, 04:11:09 PM CDT, Don Ritchie <dritchie@...> wrote:
I'm not even sure that this is the correct group to ask this.
we are looking for a tnc that can "switch" itself from 1200 to 9600 baud.
we know that the Kantronics 9612 ex can, but I don't really want to
spend that kind of money.
an unattended digiapeater that will digirepeat whatever it gets would be
the answer.
I also am not sure I understand the difference between G3RUH and GMSK
9600 ??
Thanks
Don, K8ZGW
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Hello Don,
There used to be a write up on NW Digital's website of how to do
this but it seems to be withdrawn.? That said, there are some
pros/cons to trying to do this and they can be found in the
archives on the Direwolf email list but here is one for you to
read:
??
/g/direwolf/topic/34951406?p=Created,,,20,1,0,0
--David
KI6ZHD
On 08/18/2021 02:11 PM, Don Ritchie
wrote:
toggle quoted message
Show quoted text
I'm not even sure that this is the correct group to
ask this.
we are looking for a tnc that can "switch" itself from 1200 to
9600 baud.
we know that the Kantronics 9612 ex can, but I don't really want
to
spend that kind of money.
an unattended digiapeater that will digirepeat whatever it gets
would be
the answer.
I also am not sure I understand the difference between G3RUH and
GMSK
9600 ??
Thanks
Don, K8ZGW
|
Dave R
Nigel Gunn, G8IFF/W8IFF
John Hays - K7VE / WRJT-215
Don Poaps
Tadd KA2DEW in NC