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The T41 from 4SQRP and V11 boards. 9
All: Recent there was a negative post about the V11 boards and the T41 from 4SQRP. I got this private email from Neville Marr, ZL2BNE, who has been following the T41 from its inception. He has a T41 from 4SQRP and speaks positively about it. I asked him if I could re-post his email because I know there are a lot of 4SQRP radios out there and he wants everyone to know that it is a good radio that he uses on a regular basis. I, too, have a 4SQRP T41 and it is a very good radio. He gave me his okay to post his email. Jack, W8TEE =============== Hi Jack, We haven*t communicated in quite some time but I continue to check-in on the softwarecontrolledhamradio group from time to time. I*ve recently reviewed postings and one took my attention # for the wrong reasons. /g/SoftwareControlledHamRadio/message/33358 The post was pretty disparaging of the V11 receiver performance, among other things calling it an intolerable toy radio. I see no point in giving such posts oxygen on the forum but I felt a need to let you know my experience is totally different. You will recall I was an early adopter of the T41 project, I had V10 boards made and did my own thing. You will also recall I was quite critical of some aspects of the project. I always had issues with the transmit side of my V10 T41 but never the receive side. The receiver worked from day one. In my case I don*t hear any noise on rx with a dummy load connected. I can easily hear my Marconi sig gen set as low as it will go at -127dBm. It*s a very good receiver. Over time I made a number of hardware changes to my QSE, I built two filters of my own design, one follows the QSE the other follows the PA. Final transmit change is adopting the K9HZ PA. Today my radio works faultlessly using Greg*s T41EEE. I got everything where I wanted and started logging contacts in August 2023. I*m not much of an operator but do put my creations on the air. I*ve just interrogated my log to discover I*ve logged exactly 100 contacts using my T41. Quite a cool number. I*ve had the T41 on the air more times than that, mainly local nets, but all the same 100 in the log. Below is a breakdown of the 100. I*ve worked every continent except Africia (Africia is notoriously difficult to work from NZ, South Africia is the rarest DX from NZ). So thank you for getting the T41 up and running. I am a little sad that V10/11 got supplanted by V12 because V10/11 is a very good radio. I do hope people can get V12 to a place where V12 T41 are on the air too. My T41 is my go-to radio, my daily runner. Cheers, Neville ZL2BNE -- Jack, W8TEE
Started by jjpurdum @ · Most recent @
Updated Wiki Page: T41 EP Frequently Asked Questions #wiki-notice
The wiki page T41 EP Frequently Asked Questions has been updated by Greg KF5N <greg.electricity@...>. Compare Revisions
Started by Group Notification @
OT cool new toy
I am teaching Electronics Merit Badge and did not want to take a lot of gear to meetings. I stumbled on to this and did not really expect much but it turned out to be very nice piece of kit. Much better quality than I expected. Best $100 bucks I spent in long time. https://www.aliexpress.us/item/3256807265687076.html?spm=a2g0o.order_list.order_list_main.5.1ab018029o7Qr8&gatewayAdapt=glo2usa Tim W4YN
Started by Tim @
Boards and kits in the UK/EU 4
For those of you in the UK/EU# Andy Rutter, G8HCK, has graciously agreed to distribute T41/ K9HZ/ K9HZ-KI3P boards and kits there. I*ll attempt to ship him a load of stuff and he will make arrangements to ship to you. In the short term, you should give him your order and at a time in the near future# he can forward the combined order for me to ship to him. You can contact him at: arutter@... Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois Owner 每 Operator Villa Grand Piton 每 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@...
Started by K9HZ @ · Most recent @
No SSB output 30
I have output in CW mode, but 0 in SSB. Even doing TX IQ with 750hz tone or 2 tone TX 0 output. FW is the 66.9 Tim W4YN
Started by Tim @ · Most recent @
Power Amp Efficiency
I have 3 ways of measuring power; Direct LPF output on Tek Scope, RMS voltage out of Pearson current monitor, an HP363 Taidacent power meter. I get 9.7 +/-0.9 watts out at 7.2MHz. My DC power in to the amp is 20.0 wt for an efficiency of 47%. Is that what others are seeing? dave, n3ds
Started by D Solt @
Just curious. . . 2
But do you gain anything by populating 1 or 2 of the 8Mb SPI memory chips on the Teensy? Or do you loose some functionality by doing that? Just curious. Thanks, Duane - K5CA
Started by Duane B @ · Most recent @
Trying to build a AM Demod so I can see my CW signal 3
Noob trying to learn here: It looks like I need to build a demodulater to view my CW signal with my O-Scope. (I found a circuit that I can build, but it calls for 1n34A diodes. What would be a good substitute? I was thinking maybe a BAT46? I'm hoping to use this on a QRP rig. Any assistance will be greatly appreciated.
Started by Kevin Welna @ · Most recent @
Updated Wiki Page: Sources of Hardware and Software Variants 8 #wiki-notice
The wiki page Sources of Hardware and Software Variants has been updated by Greg KF5N <greg.electricity@...>. Compare Revisions
Started by Group Notification @ · Most recent @
Encoder question 3
V66.9. I'm using the encoders from my 4SQRP kit in my V12 but it skips a lot of counts unless I turn the knobs slow. Do I have a hardware problem or a software problem?
Started by Tom - AJ8X @ · Most recent @
Attenuator problem 2
V66.9, V12.6 RF board: In the 'RF in atten' sub-menu I get the proper 3.3v outputs on pins 21-26 on U21, but 'RF out atten' doesn't show any outputs on pins 1-6. I'm missing something simple, right?
Started by Tom - AJ8X @ · Most recent @
Need Solution 9
I got the main board working. When running the test program it finds the teensy hat, the switch panel and encoder boards. When I run the display test it comes back test completed but the screen stays blank. The screen did come one one time, turned off and back on no screen. I have resoldered the pins, tried ribbon cable and individual wires still nothing. Any suggestions? Tom
Started by Tom Schulte @ · Most recent @
[AmateurRadioBuilders] [SoftwareControlledHamRadio] T41 Hardware Directions 5
※I have mentioned to Bill and Oliver that I would like to see a small PCB hold the 4 connectors (mic, PTT, headphones, and key) just because the current direct wiring makes the front look like a rat's nest. It's purely aesthetics for me and something most people will never see. ※ I*ve been working on this for a while but have tied it to an overall audio system. Here*s what I have on the list (Comments welcome): For AUDIO OUTPUT: Stereo output for RX1 and RX2. Separate Line output with variable gain (TDA1308, TDA7050, TDA7313) Separate Headphone output variable gain/ headphone amp (LM4811, TPA6120, TDA7050, TDA7313). Speaker output with on-off and variable gain. 3+W amp for speaker output (TDA2030, LM4950). For AUDIO OUTPUT: 2x MIC input (front and back panel (TDA7309) Line Input (TDA7309) Connection boards: FRONT and BACK: Front: i. AUDIO: Mic, PTT in, Phones, ii. Key? iii. On/off Back: i. AUDIO: Mic, Line in, Line out, speaker (internal). ii. Key iii. PTT IN iv. KEY OUT (from LPF) v. ACC Connector (BAND0-BAND3 from LPF Inverted). vi. USB2 vii. RS232 This is all sitting in a box here waiting to proto it up and try. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois Owner 每 Operator Villa Grand Piton 每 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@...
Started by K9HZ @ · Most recent @
T41 V12 software development path forward 16
As Jack mentioned in a recent post, I've accepted the weighty responsibility for maintaining the code for the T21 V12 radio. I've learned so much by participating in the T41 project, I'm happy to help keep this project going so others can get as much enjoyment and knowledge as I have. Here's how we're going to manage the code. Jack and Al have written a fourth and final edition of their book describing the T41 theory and operation of the T41 radio. We will maintain Version 66-9 of the code on GitHub in a state that reflects the book so that anyone buying the book in the future can download code that corresponds to the structure and features described in the book. We'll fix bugs, but not add any new features to this code. It will live here: https://github.com/KI3P/SDTVer066-9 New features and changes to the code will be hosted in a new repository on GitHub: https://github.com/KI3P/T41-V12-SDT At the moment these two repositories are identical (other than a change in the name of the sketch). Expect them to diverge over time. So what comes next? A lot of discussion in this forum over the last few years has centered around the display and the need to restructure or reformat the code to make it easier to change this code. Similarly, the changes to the hardware between V11 and V12 necessitated making many changes sprinkled through the code base. Updating the code to accommodate changing hardware becomes very challenging. Both of these issues are derived the same root cause: the software is not structured in a way that abstracts the hardware implementation. Before leaping into any major feature upgrades, I think that restructuring the code to make it more modular and hardware-portable would be a good idea. So I'm thinking a lot about how the software works and what a different architecture might look like.
Started by Oliver KI3P @ · Most recent @
NanoVNA SV4401A 4
Hi everyone. Is the NanoVNA SV4401A any good? Thanks for your input. Duane, K5CA
Started by Duane B @ · Most recent @
T41 Hardware Directions 6
Like Oliver on the Software side, I have graciously been handed the hardware side of the T41 development moving forward. (Just my take with this next statement) The software side is easier to experiment with# basically because its easier to ※roll it back§ if the experiment fails. To that end it requires more discussion and engineering calculation on the hardware side to make measurable steps forward. I do have a stable of engineers that work for me# but they are not here to work on the T41 project (unless they do it off-hours). To that end, I will start permanent ※hashtag§ sub-groups in the AmateurRadioBuilders when there is a growing interest in any aspect of the T41 hardware to address and discuss. There will be some changes to the building process tools I want to announce today. I will begin to stock solder masks shortly# something I have not done in the past. I originally considered stocking solder masks and ※renting them out§ for reuse. But after understanding that the SHIPPING for return would cost about the same as purchasing a mask outright# I will simply sell them outright. Then you can share them on a local/ club level. I*ve shipped about 50 of the display driver hardware devices. I have about 150 more in stock and then I will restock. Eventually, this hardware can be moved to the main board if there is an update. Remember, there is a difference between the T41 hardware and my K9HZ, and the K9HZ/KI3P hardware projects that we may or may not allow group think due to the fact that there may be external requirements that you are not aware of (e.g. the 100W PA module, the VHF/UHF Module, ETC.). Here are a few hardware things I am thinking about for the existing T41 boards. If we update the main board to a 12.7 at some point, I think we should consider placing the hardware from the audio hat directly on the main board. I would also put the SPI display driver on the board# a pair of ultra-low noise references for the A/D and D/A as needed, and possibly update the linear regulators with ultra noise LT3045 (etc.) devices. Maybe splitting the A/Ds and D/As to a separate card# off the Main board may facilitate more experimentation at that level too# making it easier to change. All of these are small changes# but if you are an experimenter, it might be up your alley. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois Owner 每 Operator Villa Grand Piton 每 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@...
Started by K9HZ @ · Most recent @
[AmateurRadioBuilders] [SoftwareControlledHamRadio] T41 Hardware Directions
Forgot the TDA7312#. One of my favorite parts! Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois Owner 每 Operator Villa Grand Piton 每 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@...
Started by K9HZ @
boards and kits and stuff 85
Hey for those that want boards, I*ll be in town for about 5 days so now it the time to order# ALSO I*d like to get a couple of these display driver boards into peoples hands (yes, build and free) to see if they work. Everyone of my 4 radios is in a different state and I don*t really have the freeze-up issue# but I do want to fix it permanently. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois Owner 每 Operator Villa Grand Piton 每 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@...
Started by K9HZ @ · Most recent @
Noise Floor 6
Hey 'yall, I'm still working off a 2' wip in the basement, so not the best environment. Lots of noise on 20M but still picking up 4's and 5's !!! Anyhow, I may misunderstand what the book (3rd ed) is saying but when I adjust the noise floor, the spectrum goes UP and the waterfall colors get more out of wack (my opinion). I mod'ed the code to allow the Noise Floor to go negative and it does what I was hoping/expecting/understanding. Is there something here I don't understand? Do I misunderstand what the book is saying? I'm running the latest 66.9, v12. I'm still working my noise problems. Thanks Mark KU3O
Started by epif18@... @ · Most recent @
FYI... 3
I do have part of my new system for invoicing for boards and kits up and running. Invoices for will come to you from Paypal and have the email address sales@.... Please don*t ignore them! After 5 days I will cancel them and you go to the back of the line again. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch 每 K9ZC Staunton, Illinois Owner 每 Operator Villa Grand Piton 每 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@...
Started by K9HZ @ · Most recent @
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