To add to Shirley's great response:

When first released, the RPi 4 had heat issues, but shortly after the RPi 4 was released, updated firmware was released that corrected the issue.

Firmware updates happen in the background when you run a recent OS image from the Raspberry Pi Organization.

You shouldn't have an issues with heat, the RPi in the sBitx is 'floating' over the digital board with ample air-flow in my opinion.

Ken, N2VIP

On Aug 15, 2022, at 12:29, Shirley Dulcey KE1L <mark@...> wrote:

The Raspberry Pi in the sBitx does not work especially hard. The processor gets warm but is well within specs. Mine has small paste-on heat sinks, but that's because I had already installed them when I was using that Pi for other purposes; I bought the basic kit. (I have switched to an RPi Model 400 for what the one in my sBitx used to do.) If you want to install heat sinks similar to mine they won't do any harm, and might help if you operate your sBitx in very hot conditions (say, on a picnic table in the sun); they are readily available for a couple of dollars. A more substantial heat sink like one of the tall tower ones (with or without fan) should never be necessary, and might cause a problem fitting the Pi into the sBitx case.

David,

Shielding is not the issue. Losses are. Lower Q leads to higher losses. The Q is determined by the material inside the toroid. Air/Vacuum is the best material with least losses for an inductor, whether a solenoid or a toroid.

On Tue, Aug 16, 2022, 6:23 PM David McGaw <david.g.mcgaw@...> wrote:

Toriodal inductors are inherently shielded by their geometry, no matter what the core material is, air, ferrite or other.

73,

David N1HAC

On 8/15/22 8:24 PM, Ashhar Farhan via wrote:

David,

The inside of the toroid should be hollow and it not hollow it should have as little in-fill as possible. This is the key to high performance 3D printed toroids. PLA or ABS are lossy and they can lead to lossy filters.

- f

On Tue, Aug 16, 2022, 4:16 AM Siegfried Jackstien <siegfried.jackstien@...> wrote:

would not a simple tubing do the same?? .. the "shielding" of a coil wound on a ferrite core comes from the core material ... so i guess a normal pastic tubing will work equally well if not better (fewer loss cause fewer plastic inside the coil)

so ... what is the reason to print plastic toroids??

dg9bfc sigi

Am 15.08.2022 um 23:50 schrieb David R. Hassall WA5DJJ:

Dear group,

I asked a friend of mine to build a master toroid stl file that we can put in our 3D printer software and come up with the plastic toroids almost any size we want.?? The Master was built on the basic size of 1 inch in diameter with a height of 1/2 inch and a thickness of? 0.2 inches.?? I use the CURA program to build my 3D printer files and it will allow me to scale all three axes once the basic 25mm toroid.stl file is loaded into the software.? It also allows you to print almost any number of a basic design in one printing.?? Here are some examples that I printed this morning:

I just used the scaling values of 25%, 50%, 75% and 100% to get the different sized plastic toroids pictured above.? So with the master stl file anyone with a 3D printer should be able to print almost any size plastic toroid form that you would need.?? I have attached the master stl file to this Message and it should enable anyone with a 3D printer to make the plastic Toroids that they need for the Daylight Radio Project.

Take care and have fun.

73 Dave WA5DJJ
SUPER QRSS GRABBER

On Aug 16, 2022, at 11:53, david todd via <ac9xh@...> wrote:

Justin ,i went to their website and it looks like a keyer.


its something i wouldnt install in my ubitx v6 but to each their own.probably has a decoder for those who like to send way faster than they can copy cw.HI HI.
Im a purist. decoders for cw are an insult to the cw community as a whole if you operate cw.this is from their website:K3NG’s arduino code, such as LCD display, USB keyboard, rotary encoder and CW decoder etc.

looks nice for shortwave listeners who like to tune in those secret signals, but just my opinion,? my decoder is my ears. you always know someone is using a decoder when there is a little bit of adjacent noise and the decoder cant tune it in. even though your signals and theirs are 599.

decoders for those who try to appear to copy way way faster than they are able to.sometimes they use the programmable keyrs to make canned contacts too.Sometimes "SOME" those who use decoders? are the ones who apply for fast code decoding awards from the ARRL w1aw bulletins.

73
David
ac9xh

Hello,

In theory, it is advisable to weld the arduino on the side opposite the components. This to avoid capturing too much interference on components.
I’ve read about how much.......
So that may explain an inverted pinout.? I also believe that it is automatically inverted in Kicad models.

cdt

A quick lesson on ancient history.

The Bitx40 originally had an analog VFO, as did the first Bitx20 of two decades ago.
The VFO tended to wander quite a bit, especially after things got warm
from transmitting.? Various schemes were used to cure this:
/g/BITX20/message/40

In December of 2016, Farhan started shipping the Bitx40 with the Raduino,
which has a Nano clone and an Si5351:
/g/BITX20/message/19177

But the Nano was soldered down to the Raduino, and occasionally somebody would
let a lead from the Nano touch the 12v supply and blow the Nano away.
It was a pain to replace.
So we eventually figured out how to socket the Nano on the Raduino.
/g/BITX20/message/49986

Jerry, KE7ER

On Tue, Aug 16, 2022 at 05:34 AM, Rafael Diniz wrote:

One question: is there any reason why the uBitx uses "inverted"
pinout of arduino nano?