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Re: Tiny Ten Transceiver
This is another update on my Tiny Ten transceiver, and particularly one trying to understand noise figure issues with the receiver side. ?I have done noise figure and distortion measurements and posted data. See
http://www.janbob.com/electron/TinyTen/TinyTen.htm down near the bottom at, "Dynamic Range, Noise Figure and Distortion" and at, "Noise Figure of the Mixer Alone." This receiver circuit is closely related to that of the T41 and other QSD projects, so maybe there is other noise figure data around to compare with?? I'm still hunting for the source of about 10 dB of extra noise! ? Any thoughts on this?
?
Thanks, and 73, Bob? W7PUA
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Re: T41 partially thawed
On 2025-03-17 17:29, Robert Luken W3RDL via groups.io wrote:
Jerry, do you have the part numbers for the regulators that you used?OKI-78SR-5/1.5-W36-C OKI-78SR-3.3/1.5-W36H-C They cost about $5 apiece. The 5V one is a direct drop-in. For the 3.3V one, you have to switch the wiring on two of the pins. Actually, you shift the regulator over one pin and put a little wire to one of the pins. Because for some unfathomable reason, linear 3v3 regulators don't have the standard 7805 pinout. - Jerry, KF6VB |
Re: T41 V66.4 with Code Revisions
¿ªÔÆÌåÓýSomething is wrong. ?The hardware is set up to select 17M and 10M differently. ? The truth table in in the design note directory, the I2C addresses document, the LPF tab. ?Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Mar 17, 2025, at 3:01?PM, Tim via groups.io <w4yn@...> wrote:
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Re: T41 partially thawed
¿ªÔÆÌåÓýJerry, do you have the part numbers for the regulators that you
used? On 3/17/2025 1:38 PM, jerry-KF6VB via
groups.io wrote:
On 2025-03-17 09:25, Kees Mos via groups.io wrote: --
73
Bob W3RDL |
Re: T41 Announcement from PJRC
¿ªÔÆÌåÓýYeah i wonder how that will go¡ particularly the price curve. ?Although the customs forms for CA were always a problem for shipping and that wont be a problem any longer. ?Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Mar 17, 2025, at 3:30?PM, Greg KF5N via groups.io <greg.electricity@...> wrote:
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Re: T41 V66.4 with Code Revisions
You can check the software to ensure that it didn't get messed up somehow. In BPF_Control.h, make sure that the definitions of the control words for those bands are OK: #define BPF_BAND_10M ? ?0x0002 #define BPF_BAND_17M ? ?0x4000 Then, in BPF_Control.cpp, make sure that setBPFBand applies those control words: ? ? case BAND_17M: ? ? ? BPF_GPAB_state = BPF_BAND_17M; ? ? ? break; ? ? ... ? ? case BAND_10M: ? ? ? BPF_GPAB_state = BPF_BAND_10M;????? break; Finally, check that your definition of the bands structure in the ino file hasn't got messed up. Look for the bit that starts with this line: struct band bands[NUMBER_OF_BANDS] = If all those are correct, then the problem is in hardware. I'd look for a solder short somewhere in this part of the board: The anode of D1 should go high when the 17m band is selected -- all other diode anodes should be low. The anode of D4 should go high when the 10m band is selected.
On Monday, March 17th, 2025 at 4:01 PM, Tim via groups.io <w4yn@...> wrote:
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Re: T41 V66.4 with Code Revisions
This needs to be verified with others, I get same BPF for 17 and 10M.
17M BP looks OK?
10M it selects 17M filter bank.
I was about to pull all the torroids off and start over, I had another BPF board that uses BCD, (I installed 0 resistors and cut feed back to main) and it did exactly the same.
?
Ver 66.? I think 66.4
Tim W4YN? |
Re: T41 partially thawed
¿ªÔÆÌåÓýJerry, I plan on building a new Main board with the regulators
and heatsinks on the rear of the board so any heat from them
doesn't go directly to the Teensy. I may try the switchers. My
temp - ~42C in an air-conditioned room, would like more margin if
used outdoors. On 3/17/2025 1:38 PM, jerry-KF6VB via
groups.io wrote:
On 2025-03-17 09:25, Kees Mos via groups.io wrote: --
73
Bob W3RDL |
Re: T41 partially thawed
¿ªÔÆÌåÓýKees, thanks for the input. I have a 40mm Noctua fan for the Teensy and a 30mm fan mounted on the heatsinks. Temp runs 41.9C to 42.5C. I noticed that you're running at 46.4C. I'm not sure that temperature is a major factor since I could previously run all versions up to 66.7. Now most versions only run at 600MHz. I think I still have a library problem so I'll probably do a clean (delete) rebuild of the IDE and libraries.On 3/17/2025 12:25 PM, Kees Mos via
groups.io wrote:
--
73
Bob W3RDL |
Re: T41 partially thawed
On 2025-03-17 09:25, Kees Mos via groups.io wrote:
Robert:*** I keep mine cool by eliminating sources of heat. I replaced the linear 3-terminal regulators with Murata switchers. No fan, no freezes. Can't hear any noise from them. Any noise is drowned out by the noise from the display. And the noise from the display is drowned out by band noise. - Jerry, KF6VB Kees, PA0KME |
Re: T41 partially thawed
What happens with a 528MHz clock and smallest code? This seems a tad small. Jack, W8TEE
On Monday, March 17, 2025 at 12:25:50 PM EDT, Kees Mos via groups.io <kmos3@...> wrote:
Robert:
?
Downloaded and compiled version 66.7 here. Works ok and no freeze. (Still clicks when tuning though.)
What helped with me is keeping the Teensy cool. I use a small fan in Justin's kit. Without fan version 66.2 also froze.
?
Kees, PA0KME
?
Faster with LTO, 600mHz , Dual serial
?
Memory Usage on Teensy 4.1:
? FLASH: code:311516, data:133432, headers:8676 ? free for files:7672840 ? ?RAM1: variables:195712, code:287880, padding:7032 ? free for local variables:33664 ? ?RAM2: variables:483744 ?free for malloc/new:40544 -- Jack, W8TEE |
Re: T41 partially thawed
Robert:
?
Downloaded and compiled version 66.7 here. Works ok and no freeze. (Still clicks when tuning though.)
What helped with me is keeping the Teensy cool. I use a small fan in Justin's kit. Without fan version 66.2 also froze.
?
Kees, PA0KME
?
Faster with LTO, 600mHz , Dual serial
?
Memory Usage on Teensy 4.1: ? FLASH: code:311516, data:133432, headers:8676 ? free for files:7672840 ? ?RAM1: variables:195712, code:287880, padding:7032 ? free for local variables:33664 ? ?RAM2: variables:483744 ?free for malloc/new:40544 |
Re: T41 partially thawed
I've had Covid three times now and the second one I used Palovid and it was wonderful. I should have had a prescription for this last round, but for some reason I didn't. Big mistake. Jack, W8TEE
On Sunday, March 16, 2025 at 09:51:53 PM EDT, Robert Luken W3RDL via groups.io <now.w3rdl@...> wrote:
Jack, sorry to hear about the Covid, Paxlovid is the only way to
go, but you have to take it within a couple of days. I caught it
at 79 and was feeling pretty good after three days, gone in 5. On 3/16/2025 9:43 PM, jjpurdum via
groups.io wrote:
Robert:
Thanks for the offer, but I
think we're okay. If not, I'll let you know. When I'm back on
line, I'll let you know if I find anything that might be
helpful. I feel badly it's taken this long, but this last bout
with Covid really knocked the slats out from under me. I still
can't get rid of the cough and I'm tired all the time. Perhaps
part of that is because I'm two years younger than dirt.
Jack, W8TEE
On Sunday, March 16, 2025 at 09:34:53 PM EDT, Robert
Luken W3RDL via groups.io
<now.w3rdl@...> wrote:
Jack, thanks again for the help. Actually I already
removed and reinstalled the IDE and everything else.
I had a problem like this before and doing that
fixed it, but not this time. Maybe I should delete
everything and start with a clean slate. Good luck
on the book. Did you need any updated drawings? On
3/16/2025 9:25 PM, jjpurdum via groups.io wrote:
Robert:
I wouldn't do it yet, but over the
years I've had to reinstall everything from the
IDE to the TeensyDuino to all the libraries. After
doing that, it worked. I have no clue why...it
just did. I've worked 40 of the last 48 hours on
Al's edits to the book, plus adding my own. This
will be the last update for the book. If I work a
few more hours tonight, I should have only 3
chapters to go, which I'll hopefully finish
tomorrow night. Then I'll get back to finishing my
T41 and can start testing it again. I'll keep you
posted.
Jack, W8TEE
On Sunday, March 16, 2025 at 08:10:19 PM
EDT, Robert Luken W3RDL via groups.io <now.w3rdl@...>
wrote:
Jack, thanks for the help. I'm still trying to figure out what has changed. All of the SDT Versions were working until I changed the position of the Temp display and compiled. There was a popup message about some libraries had updates and I made the mistake of clicking ok. Every version freezes now. The only exception is Ver50.2 when compiled with Faster and not Faster with LTO.? I reinstalled the IDE and all of the libraries, but they were probably the latest versions, so if it's a new library version, I have no idea which one. I did some more tests Ver50.2 : Version 66.1: It appears that system runs at 600MHz
and freezes at 528MHz. On
3/16/2025 2:21 PM, jjpurdum via
groups.io wrote:
The stack space is
probably large enough here not to be a
problem. The other version make me
uncertain. My system is still in parts
as Al and I are finishing up the last
update for the book. I'm still a week
away from a working system..
Jack, W8TEE
On Sunday, March 16, 2025 at
11:15:46 AM EDT, Robert Luken
W3RDL via groups.io <now.w3rdl@...>
wrote:
Jack, I recompiled SDTVer066.1_2-24_25 (Arduino IDE 2.3.4) unmodified(original config.h) with: Smallest Code with LTO 528MHz Serial Statistics: Memory Usage on Teensy 4.1: Compiled with Smallest code Memory Usage on Teensy 4.1: The
header in the .ino file
says it should be:
Memory
Usage on Teensy 4.1:
?
?RAM1: variables:219584,
code:210408,
padding:18968 ? free for
local variables:75328
?
?RAM2: variables:409920
?free for
malloc/new:114368
I
don't know what this means,
but if I run from a cold
start(CPU Temp ~ 30C, it
runs for about 15 secs, Temp
32.5C.
The
hotter it is the shorter the
run time.
Running
with the Ver50.x, it
stabilizes ~41C and runs
fine.
All
of the Ver66.x releases have
run before with Faster with
LTO and I was able to go
through the Freq and Receive
IQ cal.
Also
between Ver 50.x and 66.x
the Tx and Rx LEDs are
swapped.
On
3/16/2025 9:48 AM, jjpurdum
via groups.io wrote:
What happens
if you compile with the
smallest code option? In
the compile statistics,
what values do you see
Memory Usage on
Teensy 4.1:
? FLASH: code:10228, data:3016, headers:8256?? free for files:8104964 ?? RAM1: variables:3808, code:7664, padding:25104?? free for local variables:487712 ?? RAM2: variables:12416? free for malloc/new:511872 (These data
are for the ASCII table
example program.)
Jack, W8TEE
On Saturday, March
15, 2025 at 10:28:04
PM EDT, Robert Luken
W3RDL via groups.io <now.w3rdl@...>
wrote:
I removed the
Arduino IDE
2.3.4 and
reinstalled it
along with
Teensyduino and
the libraries. I
compiled
SDTVer50.2 and
it loaded and
ran. Everything
worked. Thought
problem was
fixed so I
compiled and
loaded SDT
Ver66.7. It
froze at random
points every
time I restarted
it. I went back
to the
SDTVer50.2 and
recompiled and
it froze this
time. What's
going on? Then I
realized that
the first time I
compiled the
SDTVer50.2 I had
forgotten to
change the
compile options
to those
suggested
(Faster with
LTO, 528 MHz and
Serial). It was
set for Faster
and 600MHz. I
compiled again
with the Faster
and 600MHz and
it ran fine. I tried
compiling
SDTVer66.1 with
Faster and
600MHz. Compile
failed with an
out of memory
message. Tried
SDTVer66.1 with
Faster with LTO
and 528MHz.
Compiles but
freezes. It ran
prior to this,
hardware wasn't
changed, so I
don't know what
it takes to run
the Ver66 code.
Is Arduino IDE
2.3.4 what
others are
using? 73 Bob W3RDL -- Jack, W8TEE -- 73 Bob W3rdl -- Jack, W8TEE --
73 Bob W3RDL -- Jack, W8TEE --
73 Bob W3RDL -- Jack, W8TEE -- 73
Bob W3RDL -- Jack, W8TEE |
Re: T41 partially thawed
¿ªÔÆÌåÓýJack, sorry to hear about the Covid, Paxlovid is the only way to
go, but you have to take it within a couple of days. I caught it
at 79 and was feeling pretty good after three days, gone in 5. On 3/16/2025 9:43 PM, jjpurdum via
groups.io wrote:
--
73
Bob W3RDL |