Hi Harry, my goal is a drop-in replacement for the V11 boards.? I suppose they should be called V11.1.
The software change required is trivial.? In fact, you can run a combination of V11 and V11.1 boards if you want to.
I have already successfully done that with my QSD2 prototype and a V11 QSE.

--
73 Greg KF5N

Is the Master Bug List published ? I realise it is dynamic with items added and removed as sorted, I would like to be able to see if issues I have found are included and forward any not so.
My very experimental T41 is currently configured just as a receiver, QSD with two AD831's, Si5351 generating quadrature Local Oscillator, 9 bandpass filter front end with 18db switchable preamp.
Its performance? on 80M, noise floor -120 dB, MDS 200nV , 10db snr 800nV this equals the performance of my Watkins Johnson 8711 but with spectrum and waterfall display makes it superior.
Well done team!

John Knott 2E0KNJ

Thanks Andy

I'll check that

73 Harry

Hi Greg

Thanks for your reply

I don't have access to QEX.? I appreciate your assurances that this will work and will continue to modify my system as intended.

It seems to offer a better solution than the V12 boards as it includes "Top Band" and could include 6m.

Best wishes
Harry? GM3RVL

Hi Harry-

What you are describing will work and it is very similar to what I am already working on to fix the 10 meter problem.? I posted a video demonstration of "QSD2" which is the first working prototype.
Do you have access to QEX?? There is an article from earlier this year which describes almost exactly what you are proposing.

--
73 Greg KF5N

I was planning to convert my V10 system to run like V12 with two clocks phased 90 deg apart and was wondering what to do with the 74AC74s which are already mounted on the V10 QSD and QSE boards.

I’m going to try a different system which may have some advantages over V12 or, of course, it may not work at all.

I am going to run two Si5351 clocks at the same frequency as in the V12 but I’m not going to use phase control.? For that reason, the clocks can each run down to about 1MHz.? I am going to turn on invert on one clock so that the clocks are now 180 deg apart (they will be on the same PLL and there will be a PLL reset to sync them.

Both Si5351 clocks will run at twice the wanted output frequency and will each be divided by 2 by half a 74AC74 to give two output signals at the right frequency and separated by 90 deg ready to drive the demodulator and modulator in the QSD and QSE respectively.

The two clocks will tune down to about 500kHz which will allow top band to be included and they will probably still allow 6m at the other end.

I’m about half way through modifying the QSD so if you think this won’t work please explain why and save me some effort!!

One remaining issue is to sync the two divide by 2s so that their behaviour is predictable.? I think I have a simple solution.

Harry GM3RVL

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Howard:
The group continues to be very active. The lull is likely because of the several factors. First, to my knowledge, all but one bug have been eliminated from the Master Bug List. In the past, this was a major source of posting activity. Second, Dr. Schmidt is waiting for reports on his set of PCB for the T41 from the Beta testers. He doesn't want to release their design until he has enough data points to make the call. I have a set, but am being delayed as I rework the assembly documentation for the T41 kit from 4SQRP. Third, the task of redoing the T41's kit documentation is taking longer than expected because of changes that were made to the kit but not reflected in the BOM. David Cripe, NM0S, who is the lead on the 4SQRP T41 Project, was forced to make some design changes because of the supply chain problems manifested by Covid-19 and the worldwide chip shortage. He's waiting for my pass through the T41 documentation.

I will say this: because of the earlier work of the Beta testers and other members of this group, the performance of the T41 rivals rigs costing up to 10x as much. I have made contacts with the T41 on every continent except Antarctica. It's been a long journey, but it will be more than worth the wait.

Jack, W8TEE

There are also several software updates which are being tested by the betas, hopefully to be released soon.

--
73 Greg KF5N

Nope... just working hard trying to get the V012 prototypes finished....


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@...

Is everybody taking a break from the T41-EP group?

Has something happened to this group?

The last email that I received is from Sept. 13th, 4 days ago.? I also looked directly at the group, and there are no new emails since then.

73.. Howard, WA9AXQ

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Thanks Bill

I'd be surprised if a lot of folk don't want to modify what they've already built rather than binning most of it, especially as the existing 10/11 boards won't work on 10m.

Certainly if all it involves is routing the clocks.? Even the CW mods wouldn't be hard to add in.

Harry? GM3RVL

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Is there any basic reason why V10 and V11 board systems can’t be modified to run the V12 software?

There are obvious issues.

Clk0 and clk1 from the Si5351 have to be run to QSD and QSE

Clk2 has to be available for calibration and CW

The big question, for me, is whether there are other fundamental changes such as use of different Teensy pins for existing functions etc.

This is really a question for those who designed the V12 system.? What are the ‘hidden’ pitfalls of trying to convert V10 V11 boards to run the new software and operate on 10m and beyond?

Harry? GM3RVL

Open the web page for the group. On the top right click updated twice. That will result in a latest post sort.?

i can't find it ----i'm using linux? do I look thru all 9 pages of files?

It's in the group's Files section on the groups.io website. Sort the directories by date.

- Jerry

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