|
Re: T41-EP Modifying V10/11 systems to run V12 software
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 |
|
Re: T41-EP Modifying V10/11 systems to run V12 software
Nope... just working hard trying to get the V012 prototypes finished....
toggle quoted message
Show quoted text
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 Howard Smith Sent: Sunday, September 17, 2023 4:45 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41-EP Modifying V10/11 systems to run V12 software 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 |
|
Re: T41-EP Modifying V10/11 systems to run V12 software
¿ªÔÆÌåÓýThat a lot of work and its gonna be hard to get the V011 QSE/QSD to work at and above 10M just because of the physical layout.? It will be far smarter to just add the new V012 RF board and leave the V011 QSE and QSD for experimentation. ? Here is something not talked about¡ you don¡¯t have to finish the entire RF board¡ you can just build the receive part if you want. ?That way all you really need is the MAIN and the RF boards for your receiver. ? ? 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 Harry Brash
Sent: Tuesday, September 12, 2023 10:13 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41-EP Modifying V10/11 systems to run V12 software ? Thanks Bill |
|
Re: T41-EP Modifying V10/11 systems to run V12 software
¿ªÔÆÌåÓýI suppose you COULD do that.? You need to bypass the DIV by 4¡¯s is all.? There are some additional subtle things (like CW generation) but a little surgery will, indeed, make it work at least on SSB. ? ? 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 Harry Brash
Sent: Tuesday, September 12, 2023 12:31 AM To: [email protected] Subject: [SoftwareControlledHamRadio] T41-EP Modifying V10/11 systems to run V12 software ? 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 |
|
Re: More T41 V12 Results
¿ªÔÆÌåÓýFiles section of this forum¡ ? ? 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 Harry Brash
Sent: Monday, September 11, 2023 12:49 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] More T41 V12 Results ? Al |
|
Re: T41 QSE carrier balance
¿ªÔÆÌåÓýIn RED below ? ? 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----- ? On 2023-09-10 21:14, K9HZ wrote: > There is more to it.? Its not naturally balanced the way it is > designed. ? *** What are the issues?? I was reading about the Tayloe detector this morning. Apparently, it's not a mixer at all - rather a sort of commutated capacitor filter. I remember reading about those in an article in 73 magazine back in IIRC the 70's or 80's. I was fascinated by them - they were so simple - and easy to understand. ??I think I actually built one.? It¡¯s a lot of things but it is a mixer too if you read he original paper.? I think I have it if you want it. ? ?? At first, I thought about the gains of U1 and U2, but that's probably not it;? the amplitudes of the incoming baseband IQ signals are adjustable via software.? Such adjustment nulls the opposite sideband, but has no effect on the carrier.? They are but that¡¯s not what you want to do.? You lose dynamic signal range at the A/D and D/A when you don¡¯t use them at full input (range). ?So you really don¡¯t want to make that adjustment in software. ? ?? So that leaves the RF side: U4, the dual D flipflop.? Delays in its flipflopperie?? I wonder if I could tack a small variable capacitor on each output?? There is some difference between flip-flops but not enough to make much of a difference in signal resolution.? The thing to do is get rid of them.? The real issue is the input trigger point.? Ideally, they should be balanced at the Vsg center point and a Schmitt trigger used to gate them¡. But we never do this in practice maybe to our demise. ? ?? I see that Hans Summer doesn't use a flipflop in the QCX+.? Rather, he just uses two outputs from an si5351a.? And he's not trying to transmit with it.? He gets the transmit carrier from the third si5351a output.? Yeah.? Why use them when you can perform very accurate quadrature IN THE si5351 from 1-110 MHz? !!!!!? You can even push or pull the quadrature angle a little if you need it.? MAGIC! (hint¡ you can even still drive the flip flops¡ use their output RF switched into the Tayloe and get VLF transceiver out if it!? WOW eh?? 250KHz to 100MHz transceive! Who wudda thunk?). ? ?? I know that this has all been discussed in the past, and I apologize for rehashing it.? I'm just trying to get useful output from my T41.? You have no idea! ? ??????????????????? - Jerry, KF6VB ? ? ? |
|
Re: T41 QSE carrier balance
Correct.
toggle quoted message
Show quoted text
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: Monday, September 11, 2023 11:08 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41 QSE carrier balance On 2023-09-11 08:35, Larry Acklin wrote: * I_N V12 WE HAVE MANAGED TO REDUCE THE CARRIER AMPLITUDE ON SSB TO*** Won't work. In V12, they're not using the D flipflops. They're using one si5351a clock for each phase. - Jerry |
Bart N3GQ
jjpurdum
K9HZ