Re: Initial Test of Main V12.6 board

开云体育

John… ??Two options.

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If you programmed the teensy separated from the MAIN board and ran the teensy + hat off the just the USB cable powering the teensy thru the computer… and it doesn’t see the hat… either the hat is bad, or the hat is not making connection with the pins on the teensy, or the teensy is bad.?? That’s all there is.

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If the teensy is now on the MAIN board, build the front panel board and cable it up to the main board.? see if it sees that.

?

Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

?

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

?

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it:

?

Moderator: North American QRO Group at Groups.IO.

Moderator: Amateur Radio Builders Group at Groups.IO.

?

email:? bill@...

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of John Owens K1JO via groups.io
Sent: Saturday, May 3, 2025 9:03 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Initial Test of Main V12.6 board

?

Still no I2C device found :(
I ohmed out all the connections between the stacked header pins through the Teensy and to the Teensy Audio adapter. I found some intermittent connection issues, which I think is due to the Tayda A-4662 male pin set for the Audio Hat. I noticed that Tayda sent me a substitute part, and I noticed that the pins were not as long a normal pins. So, I started over with a new Teensy 4.1, offset Audio adapter board and Teensy Audio board and longer header pins. I took lots of time to ensure that all solder joints were good and then used an ohm meter to check each pin from the stacked header pins to the Audio board. All were good.

I programmed the board with just the Teensy, adapter, and Audio board. Arudino IDE notice a? new board and port and did some automatic updates.?
The is started reporting no I2C device found. I'm not sure where to go from here...2 strikes.
I am using Arduino IDE version 2.3.6
Maybe I am missing a library??

Re: Initial Test of Main V12.6 board

#33755
Edited

Still no I2C device found :(
I ohmed out all the connections between the stacked header pins through the Teensy and to the Teensy Audio adapter. I found some intermittent connection issues, which I think is due to the Tayda A-4662 male pin set for the Audio Hat. I noticed that Tayda sent me a substitute part, and I noticed that the pins were not as long a normal pins. So, I started over with a new Teensy 4.1, offset Audio adapter board and Teensy Audio board and longer header pins. I took lots of time to ensure that all solder joints were good and then used an ohm meter to check each pin from the stacked header pins to the Audio board. All were good.

I programmed the board with just the Teensy, adapter, and Audio board. Arudino IDE notice a? new board and port and did some automatic updates.?
The is started reporting no I2C device found. I'm not sure where to go from here...2 strikes.
I am using Arduino IDE version 2.3.6
Maybe I am missing a library??

?

Scanning Wire ...

No I2C devices found

?

Scanning Wire 1 ...

No I2C devices found

Scanning Wire 2 ...
No I2C devices found

Re: t41 main board j22 connections

#33754

开云体育

Ok well I’ll be selling boards and kits in spot #2607 and I can put up a sign to direct them to your booth for those cables if you want…

?

Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

?

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

?

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it:

?

Moderator: North American QRO Group at Groups.IO.

Moderator: Amateur Radio Builders Group at Groups.IO.

?

email:? bill@...

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of Tim O'Rourke via groups.io
Sent: Saturday, May 3, 2025 7:59 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] t41 main board j22 connections

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Yes I will have 2 flea market spots in the new area, paved near where the EMC truck usually parks?

Tim

Re: Codec & ADC's

#33753

I've thought several times about creating a quad I2S object for the OpenAudio library.? At a glance it doesn't look that difficult.? Then I think if it was that easy, someone would have done it, so I put it off.

Re: t41 main board j22 connections

#33752

Yes I will have 2 flea market spots in the new area, paved near where the EMC truck usually parks?

Tim

Re: Codec & ADC's

#33751

Note that this 16 bit limitation of TeensyDuino is apparently why the dynamic range of the "software volume control" is limited.? 16 bits is enough, but you need to be able to output that into a 24 or 32 bit DAC with the 16 bits padded into 24 or 32 bit words.

The T41 is architecturally limited to the Teensy Duino I2S (quad I2S).? So the 16 bits get stuffed into 16 bit words, and when you get to lower volume levels, there is quantization noise.? At least that is the theory.

I've got it in my list of to-dos to hack a volume control into the receiver using the Open Audio library to see if it works better.

?

--

73 Greg KF5N

Re: t41 main board j22 connections

#33750

开云体育

You be at Hamvention?

?

Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

?

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

?

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it:

?

Moderator: North American QRO Group at Groups.IO.

Moderator: Amateur Radio Builders Group at Groups.IO.

?

email:? bill@...

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of Tim via groups.io
Sent: Saturday, May 3, 2025 6:49 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] t41 main board j22 connections

?

If you need a nice clean jumper I have a lot of these.

anyone who wants one I will send on my nickel.

Tim?

Re: t41 main board j22 connections

#33749

If you need a nice clean jumper I have a lot of these.

anyone who wants one I will send on my nickel.

Tim?

Codec & ADC's

#33748

I recently did some ADC measurements in preparation for an update to my Audio VNA.? I mention it here as I think it has some stuff of interest to the T41 project.? The measurements are on-going, but as of now included the SGTL5000 (ADC side)and the PCM1808.? I believe it was the T41 use of the PCM1808 that got me to look at that part---thanks.? The web page for the study is

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For this group, one interesting element that came out is that the PCM1808 produces 24-bit output data, but this is lost back to 16 if you input I2S via the Teensy AudioInputI2S followed by a Q15 to F32 conversion.? If you do the input via AudioInputI2S_F32 of the , it will include all 24-bits automatically, as well as saving a conversion.

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?Questions, comments and corrections are all appreciated.? Bob? W7PUA

Re: Initial Test of Main V12.6 board

#33747

开云体育

It should be finding the hat at WIRE at 0x0A…

?

Its either not recognizing WIRE or its shorted somewhere.

?

You can remove the teensy and hat off (as one unit)… jump the voltage tab that you cut in the instructions (UNTIL YOU REINSTALL THE TEENSY BACK ON THE MAIN BOARD), plug in the USB cable as if you were programming the Teensy, but rather to supply power and see if 0x0A shows up.? If not you have it located in a connection between the hat and the Teensy.

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You can also just build a small section of one of the other boards that includes the I2C stuff… cable it to the MAIN board and see if it sees it.? The logical choice is the Front Panel… and you just need to install the IC’s, connectors, and the jumpers on the electronics board of it…not the switches to see if it at least can read that board.

?

Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

?

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

?

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it:

?

Moderator: North American QRO Group at Groups.IO.

Moderator: Amateur Radio Builders Group at Groups.IO.

?

email:? bill@...

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of John Owens K1JO via groups.io
Sent: Saturday, May 3, 2025 2:32 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Initial Test of Main V12.6 board

?

It is still reporting No I2C devices found :(
Any advice?

Re: Initial Test of Main V12.6 board

#33746

It is still reporting No I2C devices found :(
Any advice?

Re: Initial Test of Main V12.6 board

#33745

Thanks Bill. Good idea Oliver.

Re: t41 main board j22 connections

#33744

Right behind you 78!

Re: Initial Test of Main V12.6 board

#33743

开云体育

I have found it very useful to solder some wires to the Teensy program button pons and attach them to a push button on the front panel so I can press the Program button without having to disassemble anything.

Show quoted text

-------- Original Message --------
On 5/3/25 12:47 PM, K9HZ wrote:

Yes, you can temporarily remove the hat.? Program the Teensy, turn the power off… and replace the hat if you want.
?
?
Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ
?
Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois
?
Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it:
?
Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.
?
email:? bill@...
?
?
From: [email protected] <[email protected]> On Behalf Of John Owens K1JO via groups.io
Sent: Saturday, May 3, 2025 11:19 AM
To: [email protected]
Subject: [SoftwareControlledHamRadio] Initial Test of Main V12.6 board
?
I'm following the Main Board build instructions. The first tests went well, i.e. 3.3 and 5v tests.
On the next test, i.e. loading the i2cscan.ino, the serial monitor reported No I2C devices found. However, in another popup window, it said Press Button on Teensy to manually enter Program Mode, with i2scan.ino.hex 1% used on the status line.
With the audio hat on top of the Teensy 4.1, I cannot access the "button". Should I remove the Teensy from the Main board, remove the Audio Hat, and then program the Teensy by itself first?
Best regards,
John K1JO

Re: Latest DSP and SDR book color images

#33742

I hear Hamvention has a pretty good swap meet...

               - Jerry, KF6VB

Show quoted text

On 2025-05-03 10:43, jjpurdum via groups.io wrote:
FDIM should be on every QRP'ers Bucket List. You can hit the
conference and Dayton Hamvention all in one swoop!
Jack, W8TEE
On Saturday, May 3, 2025 at 01:27:49 PM EDT, Duane B via groups.io
<dbrantley@...> wrote:
Seems like a pretty interesting even.  Thanks for the info.
Duane - K5CA
On Sat, May 3, 2025, 12:49?PM jerry-KF6VB via groups.io [1]
<jerry@...> wrote:

On 2025-05-03 09:17, Duane B via groups.io [1] wrote:
What is FDIM?  I'm familiar Hamcom and Hamcation.
Thanks,
Duane

- Jerry, KF6VB--
Jack, W8TEE
Links:
------
[1] 
[2] /g/SoftwareControlledHamRadio/message/33741
[3] /mt/112531002/243852
[4] /g/SoftwareControlledHamRadio/post
[5] /g/SoftwareControlledHamRadio/editsub/243852
[6]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy

Re: Latest DSP and SDR book color images

#33741

FDIM should be on every QRP'ers Bucket List. You can hit the conference and Dayton Hamvention all in one swoop!

Jack, W8TEE

On Saturday, May 3, 2025 at 01:27:49 PM EDT, Duane B via groups.io <dbrantley@...> wrote:

Seems like a pretty interesting even.? Thanks for the info.

Duane - K5CA

Show quoted text

On Sat, May 3, 2025, 12:49?PM jerry-KF6VB via <jerry=[email protected]> wrote:

On 2025-05-03 09:17, Duane B via wrote:
> What is FDIM?? I'm familiar Hamcom and Hamcation.
> Thanks,
> Duane
>

? ? ? ? ? ? - Jerry, KF6VB

--
Jack, W8TEE

Re: Latest DSP and SDR book color images

#33740

Seems like a pretty interesting even.? Thanks for the info.

Duane - K5CA

Show quoted text

On Sat, May 3, 2025, 12:49?PM jerry-KF6VB via <jerry=[email protected]> wrote:

On 2025-05-03 09:17, Duane B via wrote:
> What is FDIM?? I'm familiar Hamcom and Hamcation.
> Thanks,
> Duane
>

? ? ? ? ? ? - Jerry, KF6VB

Re: Nasa talks on EMC, Grounding, Bonding g& Shielding

#33739

Very interesting.? I'll have to go through the whole presentation again to have a better understanding, but here's what I recently did.

I've built a v12 on an aluminum chassis.? I have a single point ground for power.? I twisted the power lines for each board and then covered them with braid.? I grounded only one end of the braid to the chassis based on something I read a long time ago (Faraday shield).? I covered these with nylon braid to prevent random contact with the chassis.? This seems to have reduced my noise floor a bunch (10-15 pixels if you will) and it seems to reduced "birdies" at various points on each band but I'm not sure this is the right way based on the presentation.? The power lines are not signal lines so there is no need to have a current return path for a "signal" (opinion).

I don't know if the mounting screw holes on the boards are connected to the board ground plane, but I grounded each board to the chassis with a short braid (not a pig tail). The power lines braids are grounded at one end to the chassis at various convenient points, the braids not pig tails.? RF connectors are grounded to the chassis, but everything else (headphone, key, ptt, encoders, displays) are not grounded to the chassis.? The 20W PA is not grounded to the chassis.

This all gets back to my excessive noise thread.

Thoughts? Ground both ends of the shields?

Thanks

Mark

KU3O

Re: Latest DSP and SDR book color images

#33738

On 2025-05-03 09:17, Duane B via groups.io wrote:
What is FDIM?  I'm familiar Hamcom and Hamcation.
Thanks,
Duane


           - Jerry, KF6VB

Re: Initial Test of Main V12.6 board

#33737

开云体育

Yes, you can temporarily remove the hat.? Program the Teensy, turn the power off… and replace the hat if you want.

?

Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

?

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

?

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it:

?

Moderator: North American QRO Group at Groups.IO.

Moderator: Amateur Radio Builders Group at Groups.IO.

?

email:? bill@...

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of John Owens K1JO via groups.io
Sent: Saturday, May 3, 2025 11:19 AM
To: [email protected]
Subject: [SoftwareControlledHamRadio] Initial Test of Main V12.6 board

?

I'm following the Main Board build instructions. The first tests went well, i.e. 3.3 and 5v tests.

On the next test, i.e. loading the i2cscan.ino, the serial monitor reported No I2C devices found. However, in another popup window, it said Press Button on Teensy to manually enter Program Mode, with i2scan.ino.hex 1% used on the status line.
With the audio hat on top of the Teensy 4.1, I cannot access the "button". Should I remove the Teensy from the Main board, remove the Audio Hat, and then program the Teensy by itself first?

Best regards,

John K1JO