Re: boards and kits and stuff

#33117

开云体育

Routing has already been optimized… with the 4-layer board.

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Dr. William J. Schmidt - K9HZ 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 Terrance Robertson, KN6ZDE via groups.io
Sent: Thursday, March 20, 2025 9:23 AM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

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I'll try mine out with a very long cable as well.

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Regarding future Main board designs, has routing the SPI traces to minimize crosstalk been considered?

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Re: boards and kits and stuff

#33116

开云体育

Plugs DIRECTLY into the display connector on the MAIN board and sits OVER the MAIN BOARD like the picture below:

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Dr. William J. Schmidt - K9HZ 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 Greg KF5N via groups.io
Sent: Wednesday, March 19, 2025 2:32 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

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Hi Bill-

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Is your board placed at the display end?? It seems like it is more of a "buffer board" rather than a driver board, if so.
I'm trying to visualize why it works.

?

--

73 Greg KF5N

Re: boards and kits and stuff

#33115

I'll try mine out with a very long cable as well.

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Regarding future Main board designs, has routing the SPI traces to minimize crosstalk been considered?

?

Re: boards and kits and stuff

#33114

开云体育

In your case, try out a LONG cable… say 3 feet and see if that works.? If it does, I’ll start mass-producing them… and possibly get Oliver to place the circuitry on a V12.7 main board for future builds.

?

Dr. William J. Schmidt - K9HZ 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 Albert Peter via groups.io
Sent: Thursday, March 20, 2025 4:33 AM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

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Bill,

My system is working and without freeze-ups, but I will try out your board.

Al

Re: boards and kits and stuff

#33113

Bill,

My system is working and without freeze-ups, but I will try out your board.

Al

Re: boards and kits and stuff

#33112

I believe that this is the "correct" solution.

Re: boards and kits and stuff

#33111

开云体育

I have both M and C parts, but it doesn’t seem to make a difference.

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If there is a software fix for this, I really wonder why someone hasn’t done it.? There are posts all over the PRJC site about it yet no one has done a damn thing to fix it.

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Dr. William J. Schmidt - K9HZ 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 Greg KF5N via groups.io
Sent: Wednesday, March 19, 2025 6:49 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

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I hope you got the M version.? The C version is only specified to 25 MHz.

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Also, remember there is a potential software solution to boost the Teensy drivers.

That will require drilling into the device specification and writing some low level code.

The TeensyDuino does not provide support for the faster and more powerful modes the GPIO is apparently capable of.

?

--

73 Greg KF5N

Re: boards and kits and stuff

#33110

I hope you got the M version.? The C version is only specified to 25 MHz.

?

Also, remember there is a potential software solution to boost the Teensy drivers.

That will require drilling into the device specification and writing some low level code.

The TeensyDuino does not provide support for the faster and more powerful modes the GPIO is apparently capable of.

?

--

73 Greg KF5N

Re: boards and kits and stuff

#33109

I use these ferrite sleeves for ribbon cables. Seems to work FB.

Tim W4YN

Re: boards and kits and stuff

#33108

Another wacky, but successful solution is to hand wire the display with the SPI signals separated by the ground/power lines.? I used the following order successfully on an 8.5" cable:

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1. SCLK (gray)

2. GND (white)

3. VCC (black)

4. CS (brown)

5. VCC (red)

6. MISO (orange)

7. GND (yellow)

8. MOSI (green)

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The display and Main board have a few other ground connections that could be used to make this more robust, but I didn't try that after this worked with just the display dedicated connections.

Re: boards and kits and stuff

#33107

开云体育

Well, the ISO7241 is a specially designed SPI buss buffer/ isolator/ driver chip…, it plugs into the T41 display socket on the main board (close to the Teensy) and the display cable plugs into it.? We know that the problem with the display lines are the poor SPI line driver transistors on the Teensy.? This essentially puts a much higher power (lower impedance) driver/ buffer after, but close to those transistors…? PS thinks this was genius… I’m thinking it was more desperation in searching for and finding it.? ?Short J3 and leave U2 off if the display is 3.3V.? Leave J3 open and add U2 if its 5V.? Super simple.

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Dr. William J. Schmidt - K9HZ 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 Greg KF5N via groups.io
Sent: Wednesday, March 19, 2025 2:32 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

?

Hi Bill-

?

Is your board placed at the display end?? It seems like it is more of a "buffer board" rather than a driver board, if so.
I'm trying to visualize why it works.

?

--

73 Greg KF5N

T41_Display_Adapter_3.3&5V_V2.00_02-06-25.pdf

Main_Board_Mockup_For_Display_Board_V1.00_071424.JPG

Re: boards and kits and stuff

#33106

Hi Bill-

?

Is your board placed at the display end?? It seems like it is more of a "buffer board" rather than a driver board, if so.
I'm trying to visualize why it works.

?

--

73 Greg KF5N

Re: boards and kits and stuff

#33105

开云体育

The driver board seems to extend that to 6 feet (I can only measure the effect on a scope, not with the display)… someone else will give me the real story.

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Dr. William J. Schmidt - K9HZ 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 Terrance Robertson, KN6ZDE via groups.io
Sent: Wednesday, March 19, 2025 1:40 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

?

I've continued my T41 v12 display experiments.? A 9mm clamp-on ferrite worked with my 5.5" ribbon cable.?

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It didn't work with the 11" or 15" cables I had on hand to test.? So somewhere between 6" and 11" seems to be the limit for this method.

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Re: boards and kits and stuff

#33104

I've continued my T41 v12 display experiments.? A 9mm clamp-on ferrite worked with my 5.5" ribbon cable.?

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It didn't work with the 11" or 15" cables I had on hand to test.? So somewhere between 6" and 11" seems to be the limit for this method.

?

Re: boards and kits and stuff

#33103

I have a 5V display.

Re: boards and kits and stuff

#33102

开云体育

Ok expect it. Is you display set up for 5V or for 3V?

?

Dr. William J. Schmidt - K9HZ 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 Terrance Robertson, KN6ZDE via groups.io
Sent: Tuesday, March 18, 2025 11:30 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

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On Tue, Mar 18, 2025 at 08:32 PM, K9HZ wrote:

Would you like to test out one of these display drivers (FREE)…?

Sure, I'll test one.? Thanks!

Re: boards and kits and stuff

#33101

On Tue, Mar 18, 2025 at 08:32 PM, K9HZ wrote:

Would you like to test out one of these display drivers (FREE)…?

Sure, I'll test one.? Thanks!

Re: boards and kits and stuff

#33100

开云体育

Ok I’ll send you one too…

?

Dr. William J. Schmidt - K9HZ 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: Tuesday, March 18, 2025 11:04 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

?

My rig with 7" display is working ok for most part. (PA needs some tweaking)

I have a 6" ribbon cable but it has ferrite sleeve. It was freezing up but that was several FW versions ago.

I can try the driver with and with out ferrites on ribbon cable. (not sure if it would freeze up with existing cable and no ferrite)?

Tim W4YN

Re: boards and kits and stuff

#33099

My rig with 7" display is working ok for most part. (PA needs some tweaking)

I have a 6" ribbon cable but it has ferrite sleeve. It was freezing up but that was several FW versions ago.

I can try the driver with and with out ferrites on ribbon cable. (not sure if it would freeze up with existing cable and no ferrite)?

Tim W4YN

Re: boards and kits and stuff

#33098

开云体育

Would you like to test out one of these display drivers (FREE)…?

?

Dr. William J. Schmidt - K9HZ 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 Terrance Robertson, KN6ZDE via groups.io
Sent: Tuesday, March 18, 2025 10:30 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] boards and kits and stuff

?

I have a v12 Main board where the 5-volt display works with a 3.5" cable but fails with a 5" cable.? I've done some experiments.? The display works if the ribbon cable wires are separated.? I've successfully tested the display with separated wires up to 9" long.? It looks like crosstalk on the signal wires is a problem.? I'm still experimenting.