Hi Al,
Ver 066_4 is a "Winner,Winner, Chicken Dinner" as a couple of T41
experts I know would say. I was able to calibrate Xmit IQ all bands
without a problem using the receiver of my FT991A. Had a couple of
minor issues, one with display, which you are probably aware of. When
adjusting IQ Phase with .001 resolution the last digit appears to not
being erased but overwritten with the new numbert and after a couple
of twists of the dial you cannot read the number. I have also copied
the EEPROM dump and SD card dump (attached PDF) after copying EEPROM
to SD and it looks like a formatting issue in the EEPROM Dump first
line. The 80M number seems to not being copied into the SD, throwing
the number to band correlation off. Not sure how that would affect
the order and placement and did not want to try coping the SD back to
EEPROM for fear of shifting the placement order. Thanks again for
getting this working correctly.
Rick, KN4AIE

On Fri, Feb 28, 2025 at 8:26?AM Albert Peter via groups.io
<albertfpeter@...> wrote:

Hi Everyone,
Had some good feedback on the versions 66.1 and 66.3. The attached update fixes the known problems.
Fixes include issues with the SSB transmit cal and power levels, which were caused primarily because of improper initial values. I tried these several times and everything appears to work properly.
The initial setup should be performed in the following order:
1. Frequency Cal
2. Receive cal
3. Set SSB Power Level to 10W
4. Preliminary SSB PA Power cal to ensure levels are nearly correct
5. Transmit IQ calibration
6. Set CW Power level to 10W
7. CW PA Power level cal
8. Check SSB PA Power Cal. one final time

Again, it is best to erase the Teensy to start over with the new EEPRM values and be sure to uncomment line 3163 of the .ino file. Comment out again after the initial download.

Other changes were primarily to fix a couple of the increments and to correct the on-screen text in a few spots.

A revised instructions PDF will follow.
Al
AC8GY

Hello all,

I was trying out my station with a second antenna - an 65-foot End Fed Half Wave. I had built it to the kilowatt level, with a big toroid core on the matching transformer. Instead of a counterpoise, I used an 8-foot ground rod - the kind they sell to ground your house.
Probably needs a counterpoise also...

The far end of the antenna is supported by a monster oak tree on my property. Got it up there with a slingshot.

I hooked up a spare MFJ998RT autotuner to the EFHW and thence to my station through
a 40-foot length of Davis Buryflex RG/8.

It worked fine on the base T41 - decent SWR on 40, 20 & 15M. And it actually worked
on 80 - although the autotuner was clearly struggling.

HOWEVER, when I turned on my KW amp, I pushed the PTT, and the power immediately rose to 950W or so out...without me talking. And somebody on the frequency said "what's that noise?".

I figure that RF is getting back into the T41.

Probably need to stick a counterpoise on the EFHW, and maybe a common mode choke.

My main antenna does not give me any such problems; it's a trap vertical up the hill,
and it has an excellent ground - an Ufer ground, consisting of 80 feet of thick copper wire embedded in a 10 by 70' concrete slab.

I'm trying the EFHW to see if it's any quieter than my vertical. So far, it's about the same.

- Jerry, KF6VB

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--
Jack, W8TEE

On 2025-02-28 06:29, Jack, W8TEE via groups.io wrote:

All:
I've also experimented with the XIAO processor from Seeed Studio. It's
about the size of your thumbnail and costs $5:

*** Hardware debug?

- Jerry, KF6VB

--
Jack, W8TEE

On 2025-02-28 08:46, jjpurdum via groups.io wrote:

I think the Teensy could work with only 3 function calls to the Pico
(or whatever??) processor for each page:

*** It should be more granular than that. If a new S-meter reading comes in,
the Pico shouldn't have to update the entire display.

- Jerry,KF6VB

--
Jack, W8TEE

On 2025-02-28 06:06, Jack, W8TEE via groups.io wrote:

All:
I just read that the RP Pico 2 is now capable of running at 200MHz

I actually have a couple pico 2's. No wifi, though. It does do SPI,
so it could control our current display - assuming that there's an RA8875
library available.

The first step would be to isolate all access to the display. Make sure it's
all in one file. I would use C++ objects to encapsulate it. Pages and items.
A "page" would be an entire display - say the normal radio display. Or the BIT
test display. Or the IQ calibrate display. An "item"
would be one of the things that the page displays.

Once something like that was in place, it would be straightforward to substitute
"page" calls with calls to a different file that squirted the info out to the Pico.
The object of the exercise is to minimize this info. Only the Pico would know exactly
where on the screen something goes, for example.

So if the Teensy can just say "display the main screen" to the Pico, that's a lot less
work for the Teensy. There's no way around sending the individual readings for the spectrum. But the Pico would maintain the waterfall.

The Pico supports hardware debug, so development could be relatively fast.

A quick websearch revealed that there IS a working RA8875 library for the Pico.

- Jerry, KF6VB

--
Jack, W8TEE

--
Jack, W8TEE

The Main, RF, BPF, encoder boards, offset, etc are all public and part of
the T41.

MY K9HZ 20W PA, 100W PA, LPF, Antenna Tuner, etc are all my design that I
sell for multiple radios in addition to the T41... so the only thing I don't
provide with those are the gerbers.


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: www.VillaGrandPiton.com

Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.

email:? bill@...

Yeah that's probably wrong. See the instructions. It follows Olivers report.


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: www.VillaGrandPiton.com

Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.

email: bill@...

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