|
Re: T41 SDT Code Issues
I will give it a try. At this point, I would put salt on a swallow's tail if I thought that would work. I did back up my personal photos, but not my past tax records. I also had about 8 months work on a "How-To" book and I never back any of it up. Stupid...just plain stupid. I'll let you know if it worked. Jack, W8TEE
On Friday, February 21, 2025 at 01:49:37 PM EST, Larry - AC8YE via groups.io <ac8ye@...> wrote:
Jack, Put the failed drive in a zip lock bag, then that in another zip .lock bag.? I usually put the double bagged drive in the freezer for at least 24 hours.? Once you take it out of the freezer, you have about 45 minutes to reconnect the drive and try to recover your data.? This has worked for me over the past 35 years. Larry - AC8YE
Sent with secure email.
On Friday, February 21st, 2025 at 12:47 PM, jjpurdum via groups.io <jjpurdum@...> wrote:
--
Jack, W8TEE |
|
Re: T41 SDT Code Issues
Jack, Put the failed drive in a zip lock bag, then that in another zip .lock bag.? I usually put the double bagged drive in the freezer for at least 24 hours.? Once you take it out of the freezer, you have about 45 minutes to reconnect the drive and try to recover your data.? This has worked for me over the past 35 years. Larry - AC8YE
Sent with secure email.
On Friday, February 21st, 2025 at 12:47 PM, jjpurdum via groups.io <jjpurdum@...> wrote:
|
|
RF Board
¿ªÔÆÌåÓýJack.. .you said you want a new V12 RF board? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? |
|
Re: Excessive Noise
¿ªÔÆÌåÓýMark¡ I¡¯m fully restocked with T41 boards¡ latest revisions too.? I have at least 100 of each board gearing up for Hamvention. ? Unplug the RF board so its just the MAIN board and see if it still happens (maybe you already did this experiment).? If it¡¯s still there, it has to be either the A/D, the D/A or the Audio hat.? They are the only things on the main board that are associated with the I2C Clock. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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 epif18 via groups.io
Sent: Friday, February 21, 2025 11:55 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Excessive Noise ? Hey yall' I've tried everything I can think of.? The pulsating noise corresponds to the sclk signal (pin 13 led which also pulsates) which seems to be modulated by the spectrum update rate that is then getting onto the power lines.? It's on the 12v,? 3.3v and 5v lines. Pulsating level and rate varies by band, particularly 20M. This pulsating happens with a full up system and with only MAIN and the display running (happens without the display hooked up too). I've rebuilt the power supplies on main, encased the display in copper, wrapped the rebuilt display cable in copper and grounded one end, retouched most of the solder joints, all to no avail.? I've changed the teensy and looked at the whole card under the microscope and nothing!? I'm using a metal case, single point ground, nothing is grounded to the case.? Using 50.2. So I need a MAIN circuit card.? Are card sets still available?? Does anyone have a V12 set they want to sell or an extra MAIN they want to get rid of?? Everything else works great, BPF, LPF, RF including the attenuators (which surprised me!). Thanks Mark KU3O |
|
Re: RF Board update.
¿ªÔÆÌåÓýWith the addition of the following: ?
? That¡¯s it.?? You don¡¯t NEED to do any of this, but you can do it¡ to get better performance from your existing T41.? That includes better RX S/N and better TX audio bandwidth and spectrum and calibration.? We are splitting hairs a bit here though.? IF you have a perfectly good working RF board that you are happy with¡ then just leave it. ? I think the jury is still out on if it makes sense to use 0 Ohm jumpers for ?C32, C36, C42 and C51 too¡? We should have this resolved shortly. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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 Greg, KM5GT via groups.io
Sent: Friday, February 21, 2025 11:44 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] RF Board update. ? In terms of reworking an existing board it looks like I need to: 1. Remove U19, U20, U22 and U23 along with associated capacitors (capacitor removal looks optional as they are no longer connected).? Install JP18 and JP 19.?? 2. Add a 0.1uF capacitor at the junction of L7 and Y1 VDD.?? ? Does this look correct? ? ------------------------ |
|
Re: T41 SDT Code Issues
I have the C boot drive which is a SSD, but only 500G, my D drive, which holds everything and is 1 TB and the drive that died, and drive F which is a 2T hot-swap backup drive. D no longer shows up in Windows Explore or the Disk Manager. I'm hoping it's a faulty/dirty connector which I will check when I tear the system down later today. If that doesn't work, how long in the fridge? If that fails, I'll go over to Al's and put it in an old system he has and see if that controller can find it. If that doesn't work, I've lost a tremendous amount of non-T41 stuff and I'll start shopping for a large pile of kindling and a very flammable Viking ship. Jack, W8TEE
On Friday, February 21, 2025 at 12:18:23 PM EST, jerry-KF6VB <jerry@...> wrote:
On 2025-02-21 06:47, jjpurdum via groups.io wrote: > Also, I have other distractions now. At some time yesterday my main > data drive died *** That sucks.? Did it die completely, or just lose data?? Sometimes they can be read by putting the drive in the fridge. ? I have a unique system.? I don't keep anything important on my desktop PC.? Instead, I have a Linux server running the Samba suite that acts as a windows fileserver.? I actually have three of those servers;? two active, and the third being upgraded to a newer Linux.? Also, I do an encrypted incremental backup to the cloud once a week.? The server in use backs itself up to the second hot server every night. ? So far, I've been lucky.? Have had some close calls, but never lost it all. My email queue goes back to 1989!? Back then I didn't have real Internet.? My PC ran a program called "UUPC" that dialed up another computer and transferred mail and netnews via the UUCP protocol.? I had it on a 24 hour timer.? In the middle of the night, it would come on for a few hours.? UUPC was in the autoexec.bat. ? ? ? ? ? ? ? ? ? - Jerry, KF6VB -- Jack, W8TEE |
|
Re: T41 SDT Code Issues
¿ªÔÆÌåÓýIt seems to be a combination of things (not just one)¡ weak SPI line drivers on the Teensy T4.1 and cross-talk (capacitive coupling) between the data lines that gets worse as the cables get longer.? That¡¯s why shorter cables or cables with some form of ferrite can make the display work.? ? There are a few ways to fix this: ?
? There may be more but that¡¯s what we know about for sure¡ ? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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 jjpurdum via groups.io
Sent: Friday, February 21, 2025 11:07 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41 SDT Code Issues ? What would be the cause of the display issues when some of us have ribbon connectors to the display that are 4-5" long? ? Jack, W8TEE ? On Friday, February 21, 2025 at 11:57:46 AM EST, jerry-KF6VB <jerry@...> wrote: ? ? On 2025-02-21 07:58, K9HZ wrote:
|
|
Re: T41 SDT Code Issues
What would be the cause of the display issues when some of us have ribbon connectors to the display that are 4-5" long? Jack, W8TEE
On Friday, February 21, 2025 at 11:57:46 AM EST, jerry-KF6VB <jerry@...> wrote:
On 2025-02-21 07:58, K9HZ wrote: > If a new main board was designed... I think I would do what John did... > sort > of... I would put the main board right on the back of the display.? > That way > there is no display cable. *** Like the Ubitx.? Good idea. ? ? ? ? ? ? ? ? ? - Jerry, KF6VB -- Jack, W8TEE |
|
Re: T41 SDT Code Issues
If a new main board was designed... I think I would do what John did... sort
toggle quoted message
Show quoted text
of... I would put the main board right on the back of the display. That way there is no display cable. The thing is already a 4 layer board so the noise from the display encroaching into the audio portions should be relatively small (although I'd want to check that). Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. email:? bill@... -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of jerry-KF6VB Sent: Friday, February 21, 2025 9:50 AM To: [email protected] Cc: Greg KF5N via groups.io <greg.electricity@...> Subject: Re: [SoftwareControlledHamRadio] T41 SDT Code Issues If we were to redesign the Teensy - or just do a Main Board with a directly soldered iMXRT1062 - I'd want to free up the JTAG port for *hardware debug*!!!! It would speed up software development by an order of magnitude. - Jerry, KF6VB |
|
Re: [AmateurRadioBuilders] RF Board update.
¿ªÔÆÌåÓýAl was working on the TX calibration routines and noticed that the calibration worked fine above 350hz but not below.? There was too much phase shift between I and Q caused by the corner frequency of the Sallen-Key filter in the TC chain.? He changed the sampling (in software) and did some simulations to opened up the filters to a much higher frequency by changing the corner frequency of the filters.? Now the phase shift is much lower and the works to about 100hz (about the limit of the current Hilbert transforms as-is).? This effectively makes the calibrated radio easily meet FCC specifications and operate with a transmit audio frequency down to 100hz which is adequate for FT8 transmission (the upper end cutoff is above 4khz). ? So what does all of this gibberish mean for the average guy building a T41?? Well, you make the following changes to your V12 RF board and use the latest software (to be released shortly): ?
? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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 G0SDF via groups.io
Sent: Friday, February 21, 2025 4:28 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] [AmateurRadioBuilders] RF Board update. ? Bill So what are the changes that Al is referring to? John G0SDF |
|
Re: T41 SDT Code Issues
In its current state, I would say No, but others (Greg?) have added the extra memory chip but I don't know their results...perhaps they could enlighten us. Right now, our T41 code uses less than 3% of flash space, but eats about 70% of SRAM. I have been lax about getting rid of globals, which is a horrible admission on a number of fronts (e.g., encapsulation, memory use efficiency, etc). I'd like to say I'm going to go back after this next software release and clean that up, but that would likely be a lie as both Al and I have been at this for almost 7 years and we're getting a little burned out.? Also, I have other distractions now. At some time yesterday my main data drive died which I need to recover as it appears my backup hasn't run for several months! The good news is I've sent all the T41 code to Al all along, so he's never more than a few hours behind me. The bad news is everything else from current tax records to personal photos are on the lost drive. There's a lesson here, people... Jack, W8TEE
On Friday, February 21, 2025 at 09:27:29 AM EST, Tim via groups.io <w4yn@...> wrote:
Jack
I see that there are additional memory options that can added to Teensy.
At some point does it make sense to swap out current Teensy for one with added memory chips?
I see that it does not add a great deal of $$ to build.
Tim W4YN
-- Jack, W8TEE |
jjpurdum
Larry - AC8YE
K9HZ