Re: T41 Locking up again!
I have driver boards for this available when I return on Tuesday. ?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com
email:??bill@... ?
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On Mar 14, 2025, at 3:38?PM, Phil Taylor via groups.io <philbyt1@...> wrote:
? Robert
?
Do you have a driver for the SPI to the display? If not, how long is the cable? Try a very short cable if you have no driver. Humor me.
?
My theory is that lockups occur because the SPI fails after startup, I was having a similar issue, and then I shortened the display cable from 5 in to 2 in and the problem ceased.
?
Regards
Phil VK2KKZ
|
Re: T41 Locking up again!
Phil, thanks.
I solved that issue months ago. Shortened the cable to ~2.5",
worked solid until I clicked OK on a update libraries
message(never again). Switching between my IC7610 and the T41,
comparable reception. Nothing has changed hardware wise and SDT
versions that worked before now lockup at the Main screen or
earlier. I'm going to remove the IDE and reload the libraries. I
had a similar problem before and that was the only thing that
fixed it. Teaching a class tomorrow, so I probably won't get it
done until Sunday.?
Never found out what caused it. I'm going to bug Dr. Schmidt
again about the Display Driver I ordered. It can't hurt.
The first time it happened I had a 6" cable and it would come up
and start drawing random lines and colors on the screen. Moving
the Main Board got rid of the random lines but it still locked up
when it started drawing the Spectrum and Waterfall. It seems to be
waiting for a reply from the Display, which never happens.
On 3/14/2025 6:38 PM, Phil Taylor via
groups.io wrote:
Robert
?
Do you have a driver for the SPI to the display? If not, how
long is the cable? Try a very short cable if you have no driver.
Humor me.
?
My theory is that lockups occur because the SPI fails after
startup, I was having a similar issue, and then I shortened the
display cable from 5 in to 2 in and the problem ceased.
?
Regards
Phil VK2KKZ
--
73
Bob W3RDL
|
Re: T41 Locking up again!
Robert
?
Do you have a driver for the SPI to the display? If not, how long is the cable? Try a very short cable if you have no driver. Humor me.
?
My theory is that lockups occur because the SPI fails after startup, I was having a similar issue, and then I shortened the display cable from 5 in to 2 in and the problem ceased.
?
Regards
Phil VK2KKZ
|
Re: T41 Locking up again!
Oliver, thanks, I remember that now. I got confused due to the
comment in SDT.h for the #include <RA8875.h> that gives the
url for the RA8875_4 library. It should probably be removed.
However, it didn't make any difference. I removed the RA8875
libraries and reinstalled Teensyduino. Tried several clean
versions back to Ver50.0-1? and all locked up at the main screen
or before. As I recall, the last time I had a similar problem, I
wound up removing the IDE and reinstalling everything.
On 3/13/2025 8:12 PM, Oliver KI3P via
groups.io wrote:
You should be using the RA8875 library that comes
bundled with the Teensyduino package, so you can remove the
Adafruit library. That might be the source of your issue.
-------- Original Message --------
On 3/13/25 4:54 PM, Robert Luken W3RDL via groups.io
wrote:
I went back to W8TEE's Ver 66-3 release and compiled,
with no changes. It compiled and loaded and it makes it to
the main screen. Serial monitor gets to Setup Complete.
Totally frozen, no shut down.
Memory Usage on Teensy 4.1:
? FLASH: code:302212, data:129248,
headers:8852?? free for files:7686152
?? RAM1: variables:177600, code:278728, padding:16184??
free for local variables:51776
?? RAM2: variables:462400? free for malloc/new:61888
Seems like I've been here before, so I suspect a
library(Display!). What is the correct version of the
RA8875 library:
??? Adafruit RA8875
???
Neither fixes lockup, however the RA8875_4 makes it to the main loop.
Nothing has changed hardware wise. Any suggestions?
--
73
Bob W3rdl
--
73
Bob W3RDL
|
Re: T41 Locking up again!
The Teensy display library is different than the Adafruit library. Try changing libraries.
Jack, W8TEE
On Thursday, March 13, 2025 at 04:54:59 PM EDT, Robert Luken W3RDL via groups.io <now.w3rdl@...> wrote:
I went back to W8TEE's Ver 66-3 release and compiled, with no
changes. It compiled and loaded and it makes it to the main
screen. Serial monitor gets to Setup Complete. Totally frozen, no
shut down.
Memory Usage on Teensy 4.1:
? FLASH: code:302212, data:129248, headers:8852?? free for
files:7686152
?? RAM1: variables:177600, code:278728, padding:16184?? free for
local variables:51776
?? RAM2: variables:462400? free for malloc/new:61888
Seems like I've been here before, so I suspect a
library(Display!). What is the correct version of the RA8875
library:
??? Adafruit RA8875
???
Neither fixes lockup, however the RA8875_4 makes it to the main loop.
Nothing has changed hardware wise. Any suggestions?
--
73
Bob W3rdl
-- Jack, W8TEE
|
Re: T41 Locking up again!
You should be using the RA8875 library that comes bundled with the Teensyduino package, so you can remove the Adafruit library. That might be the source of your issue.
-------- Original Message -------- On 3/13/25 4:54 PM, Robert Luken W3RDL via groups.io wrote:
I went back to W8TEE's Ver 66-3 release and compiled, with no
changes. It compiled and loaded and it makes it to the main
screen. Serial monitor gets to Setup Complete. Totally frozen, no
shut down.
Memory Usage on Teensy 4.1:
? FLASH: code:302212, data:129248, headers:8852?? free for
files:7686152
?? RAM1: variables:177600, code:278728, padding:16184?? free for
local variables:51776
?? RAM2: variables:462400? free for malloc/new:61888
Seems like I've been here before, so I suspect a
library(Display!). What is the correct version of the RA8875
library:
??? Adafruit RA8875
???
Neither fixes lockup, however the RA8875_4 makes it to the main loop.
Nothing has changed hardware wise. Any suggestions?
--
73
Bob W3rdl
|
I went back to W8TEE's Ver 66-3 release and compiled, with no
changes. It compiled and loaded and it makes it to the main
screen. Serial monitor gets to Setup Complete. Totally frozen, no
shut down.
Memory Usage on Teensy 4.1:
? FLASH: code:302212, data:129248, headers:8852?? free for
files:7686152
?? RAM1: variables:177600, code:278728, padding:16184?? free for
local variables:51776
?? RAM2: variables:462400? free for malloc/new:61888
Seems like I've been here before, so I suspect a
library(Display!). What is the correct version of the RA8875
library:
??? Adafruit RA8875
???
Neither fixes lockup, however the RA8875_4 makes it to the main loop.
Nothing has changed hardware wise. Any suggestions?
--
73
Bob W3rdl
|
My Flex 6400 has found a new home.
Jack, W8TEE -- Jack, W8TEE
|
So you probably want to characterize the gain (loss) from the antenna input on the LPF to TP6 of the RF board since we specifically put U2 in to overcome the loss from the BPF and the attenuator on the RF board…? That is the gain that you would calibrate out for the s-meter. ? ? 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@... ? ?
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From: [email protected] <[email protected]> On Behalf Of Oliver KI3P via groups.io
Sent: Monday, March 10, 2025 6:22 PM
To: [email protected]
Subject: Re: [SoftwareControlledHamRadio] Transmit attenuator? The insertion loss of the attenuator chip when set to 0dB is roughly 2dB below 20 MHz and increases at higher frequencies, so the loss you're seeing is expected. See this plot of the receive attenuator insertion loss vs frequency and attenuation setting -- the transmit path should be the same. On Monday, March 10th, 2025 at 10:38 AM, John G0SDF via groups.io <jatkins295@...> wrote:
The transmit attenuator is working in that the amount of attenuation is able to be adjusted by the setting in the Menu. However at the 0dB attenuation setting I am getting -3dB. I have a 50 ohm load on RF_OUT (J6) on the RF Board. I am testing this on CW and the peak to peak signal (ignoring overshoot) going into the attenuator chip (U12) is 980mV but the peak to peak signal out is only 696mV. Has anyone else measured the performance of the transmit attenuator?
?
|
The insertion loss of the attenuator chip when set to 0dB is roughly 2dB below 20 MHz and increases at higher frequencies, so the loss you're seeing is expected. See this plot of the receive attenuator insertion loss vs frequency and attenuation setting -- the transmit path should be the same.
On Monday, March 10th, 2025 at 10:38 AM, John G0SDF via groups.io <jatkins295@...> wrote:
The transmit attenuator is working in that the amount of attenuation is able to be adjusted by the setting in the Menu.
However at the 0dB attenuation setting I am getting -3dB. I have a 50 ohm load on RF_OUT (J6) on the RF Board.
I am testing this on CW and the peak to peak signal (ignoring overshoot) going into the attenuator chip (U12) is 980mV
but the peak to peak signal out is only 696mV.
Has anyone else measured the performance of the transmit attenuator?
|
Re: LPF-Control PCB TX Logic at U3 & U7
Cool!
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com
email:??bill@... ?
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On Mar 10, 2025, at 9:51?AM, D Solt via groups.io <davesolt@...> wrote:
? Thanks to all for the help.? I was misunderstanding the signal path, thinking that the BPF was out of the signal path during transmit.? My T41 is working with several watts out!? Now to finish calibrating.
dave, n3ds When TX_BPF_SEL is LOW, then RF2 is selected on U3 and U7 (BPF is bypassed for the TX path). When TX_BPF_SEL is HIGH, then RF1 is selected and the BPF is placed in the path.
|
U3 |
U7 |
| TX_BPF_SEL |
Pin 6/A |
Pin 4/B |
RFC → |
Pin 6/A |
Pin 4/B |
RFC → |
| 0 |
0 |
1 |
RF2 |
0 |
1 |
RF2 |
| 1 |
1 |
0 |
RF1 |
1 |
0 |
RF1 |
On Sunday, March 9th, 2025 at 5:37 AM, John G0SDF via <jatkins295= [email protected]> wrote:
According to the data sheet this is correct, selecting the BPF for transmit sets TX_BPF_SEL high resulting in a high on pin 6 of U3 which in turn connects RFC to RF1 which is the BPF connector. So no should not connect to RF2.
|
Look at Oliver, sportin' V066.7?
Go Oliver!
|
Hi Bill-
?
That is a bit of roll-off in the baseband circuitry which follows the QSD (quadrature sampling demodulator).
That's a trade-off when using the demodulator for both demodulation and as a panadapter.
?
--
73 Greg KF5N
|
Re: LPF-Control PCB TX Logic at U3 & U7
Thanks to all for the help.? I was misunderstanding the signal path, thinking that the BPF was out of the signal path during transmit.? My T41 is working with several watts out!? Now to finish calibrating.
dave, n3ds
When TX_BPF_SEL is LOW, then RF2 is selected on U3 and U7 (BPF is bypassed for the TX path). When TX_BPF_SEL is HIGH, then RF1 is selected and the BPF is placed in the path.
|
U3 |
U7 |
| TX_BPF_SEL |
Pin 6/A |
Pin 4/B |
RFC → |
Pin 6/A |
Pin 4/B |
RFC → |
| 0 |
0 |
1 |
RF2 |
0 |
1 |
RF2 |
| 1 |
1 |
0 |
RF1 |
1 |
0 |
RF1 |
On Sunday, March 9th, 2025 at 5:37 AM, John G0SDF via <jatkins295= [email protected]> wrote:
According to the data sheet this is correct, selecting the BPF for transmit sets TX_BPF_SEL high resulting in a high on pin 6 of U3 which in turn connects RFC to RF1 which is the BPF connector. So no should not connect to RF2.
|
Need to calibrate it. ?Its not absolute.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com
email:??bill@... ?
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On Mar 10, 2025, at 7:38?AM, John G0SDF via groups.io <jatkins295@...> wrote:
? The transmit attenuator is working in that the amount of attenuation is able to be adjusted by the setting in the Menu.
However at the 0dB attenuation setting I am getting -3dB. I have a 50 ohm load on RF_OUT (J6) on the RF Board.
I am testing this on CW and the peak to peak signal (ignoring overshoot) going into the attenuator chip (U12) is 980mV
but the peak to peak signal out is only 696mV.
Has anyone else measured the performance of the transmit attenuator?
|
Good morning Greg,
Last night was able to get the T41-2 main board/qse2/qsd2 combination working in what was originally a 4SQRP T-41k. (so far just on receive)
I noticed that the right side of the waterfall display seemed to be more sensitive than the left. When I looked at the google drive pictures of your radio posted on this thread, I noticed the same effect. I am curious as to the reason for this.
73 Bill NX5AA
|
The transmit attenuator is working in that the amount of attenuation is able to be adjusted by the setting in the Menu.
However at the 0dB attenuation setting I am getting -3dB. I have a 50 ohm load on RF_OUT (J6) on the RF Board.
I am testing this on CW and the peak to peak signal (ignoring overshoot) going into the attenuator chip (U12) is 980mV
but the peak to peak signal out is only 696mV.
Has anyone else measured the performance of the transmit attenuator?
|
And this is what i get when i text on my phone at 5 AM…
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com
email:??bill@... ?
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On Mar 10, 2025, at 6:34?AM, K9HZ <bill@...> wrote:
? With the replacement of the follower and filter op amps post mixer, i see about a 7db improvement and at that point i believe the limit is the mixer, si 5351, and line shielding between the. ?We are in some stellar class radios at this point. ?Im very happy with the way this has turned out. ?
The QST review of the IC-7300 was madd public by icom so i may post that in the files section as a stick to compare against. ?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com
email:??bill@... ? On Mar 10, 2025, at 3:41?AM, Oliver KI3P via groups.io <oliver@...> wrote:
? Greg, I get a very similar number for the noise floor (-131 dBm) if I tune away from the display noise, so the V12 hardware is capable of achieving similarly low noise floors if you can fix the display noise. Hopefully folks who have solved this can share their stories of success for the rest of us to learn from.
|
With the replacement of the follower and filter op amps post mixer, i see about a 7db improvement and at that point i believe the limit is the mixer, si 5351, and line shielding between the. ?We are in some stellar class radios at this point. ?Im very happy with the way this has turned out. ?
The QST review of the IC-7300 was madd public by icom so i may post that in the files section as a stick to compare against. ?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com
email:??bill@... ?
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On Mar 10, 2025, at 3:41?AM, Oliver KI3P via groups.io <oliver@...> wrote:
? Greg, I get a very similar number for the noise floor (-131 dBm) if I tune away from the display noise, so the V12 hardware is capable of achieving similarly low noise floors if you can fix the display noise. Hopefully folks who have solved this can share their stories of success for the rest of us to learn from.
|
Greg, I get a very similar number for the noise floor (-131 dBm) if I tune away from the display noise, so the V12 hardware is capable of achieving similarly low noise floors if you can fix the display noise. Hopefully folks who have solved this can share their stories of success for the rest of us to learn from.
|
K9HZ
jjpurdum
Tom - AJ8X