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I have a major problem with the main board. I built it with the reverse power protection. When I first built it I had 3.3vand5v at the test points. Now when I added the teensy and audio hat and test it I get I2C devices not found. Also I have 1.35 amps and 14 watts per the power supply meters. No longer have 3.3 v and the LM117 is very very hot to the touch. I blow one teensy replaced with new one and resoldered all pins still no luck. Can someone point me in the right direction to look for the problem? Tom AB9EK

I was just browsing their website, and I noted that Hans has finally released beta SSB software for the QMX. Downloaded it, ran it...holy crap, it works! SSB is created by doing magic with the IQ signals and simultaneously amplitude modulating the power feed to the *digital* PA - which is four tiny BS170 MOSFETs in parallel-push-pull delivering nominal 5W. The IQ calibration is done via the serial interface terminal menus. You tell it to start, it prompts you to connect a dummy load - and it just does the whole thing UNATTENDED. All bands. Takes a while, at least a half hour. It supports CESSB, predistortion, compression, a transmit equalizer, and something called "Mic noise cancellation". This is unique: Hans found that his CPU's ADCs were noisy. There were noise spikes every 500Hz. So what he does is he monitors an unused ADC channel, and uses the noise in that to cancel the noise in the main ADC mike channel. Wow. Unfortunately, the software is both closed source and encrypted. I've interfaced it with my Tiny Linear project, and am seeing about 50W out. - Jerry, KF6VB

I sent out five of those new display driver boards about a week ago and only saw posted that Terrance got his working as was able to use a 3-foot long display cable without display-T41 errors/lockups. Anyone else built it yet? I know i didnt publish an assembly manual before i headed out of the country but the thing is pretty simple and i did send out a note re how to make it work on 5v or 3.3v. Anyone else? I think its a winner but would like to know so i can get parts and boards ordered to send these out before Hamvention Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email: bill@...

I've sent a message several times asking about the digital post processor that was in the book "microcontroller s for amateur radio" and have gotten no response so no need for me to belong to the group.... Steve

I’m starting to get T41 V12 boards and other kits back in stock. I have a shipment of 100+ boards of each type for the T41 showing up on Friday. Two new boards and kits that will work with the T41 are 1) a dual concentric encoder board (two encoders in one for volume and RF gain, etc.), and 2) A 20W RF Attenuator KIT to be used for calibration and for predistortion elimination. Meanwhile, here is what I have as of today (all plus shipping): BOARD IN STOCK COST Main V12 0 $ 1.18 RF V12 23 $ 1.22 BPF V12 18 $ 0.85 LPF Control V12 0 $ 1.27 LPF Filter V12 1 $ 1.27 LPF Carrier - RLY V12 8 $ 0.45 Front Panel Switch 15 $ 1.40 Front Panel Electronics 13 $ 1.40 Encoder Boards 304 $ 0.25 2nd RX Adapters V12 24 $ 0.68 Teensy Hat Offset V12 94 $ 0.32 ATTiny85 With Latest Code 6 $ 2.50 100W PA Semi-Kit 0 $ - 20W PA Semi-Kit 101 $ 19.28 Fixed RF Attenuator (NEW!) 0 $ - Digital RF Attenuator 61 $ 0.75 20A Reverse Polarity Prot Kit 9 $ 8.99 50A Reverse Polarity Prot Kit 27 $ 9.99 20A Power Distribution Kit 104 $ 5.99 PA Driver Kit (NEW!) 25 $ 6.99 PE4302 Attenuator Chips 14 $ 2.50 LC Meter ? ? VHF-UHF T41 Kit ? ? 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@...

I have asked for some help and to purchase some boards through this site. I have not seen my posts or have a reply to them. Am I being black balled? If that's the case would someone please let me know. Tom AB9EK

Working with the Version 66.9 T41 software. This particular weirdness affects nobody but me.... I use four unused i/o bits to control my homebrew linear amplifier. They tell the amplifier what band the transceiver is on. These bits ( 28,29,30,31 ) were used in the V11 system to control its four-band LPF. There was an 80M pin, a 40M pin etc. They are not used at all in the V12 system. So I hooked them up to some transistor buffers and hence out to the linear. V12 does have internal Yaesu codes in the LPF control card, but they are the wrong polarity. Instead of adding hardware inverters, I just used those other four pins. Now - with the V66.9 software, I am unable to write to those pins! The linear stays at its default - 6M. The reason for that particular default is that it minimizes the risk of transmitting on the wrong band. If you use an LPF that is too high, you run the risk of annoying the FCC. If OTOH you transmit through an LPF that's too low, you run the risk of frying the expensive LDMOS final. I do have protection against that in the linear, but I am a "belt & suspenders" guy... Back to the problem: I have verified that the code to write to those pins is being executed. ALSO, I wrote separate code at the top of loop() to write to them. No joy, no output. BUT - I wrote a throwaway sketch - not a radio at all - to just write to those pins - actually an incrementing count. Yup, they work fine. And the linear cycles through its bands. SO; Something in the code is preventing me from writing those pins. Gotta be one of two things: 1. Something else is writing to them. or 2) Something is pinMode-ing them to INPUTs. Darned if I can find it though. There are some legacy places where those pins are written, but I'm pretty sure I found them all. It has worked on other versions, just not this one. - Jerry, KF6VB

I just downgraded to V50.0. No oscillation. So it is a software problem. "Ver 063-1-beta" - oscillates. "Ver 066-7-SWR" from 3/5/2025 - oscillates "Ver 065" from 2/20/2025 - oscillates "Ver053" - does NOT oscillate. "Ver050.0" from Oliver 1/20/2025 - does NOT oscillate. "Ver066-9" from Oliver - oscillates. - Jerry, KF6VB On 2025-03-22 13:41, K9HZ wrote: > Its not a hardware problem. The radio has been working fine until > recently when some software mods were made. > > Use some sound deductive reasoning here. This problem did not exist a > month ago with any transceivers that were build. Then work was done > on the software in a mad dash to close it out for the next version of > the T41 book. All of a sudden, there are issues with most/ everyone's > radio. What conclusion and action would you take from that? Bobb > some hardware out of you radio?... or go back and check out an earlier > version of the software? > > 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 [1] > > 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 Rick Price via > groups.io > SENT: Saturday, March 22, 2025 3:14 PM > TO: [email protected] > SUBJECT: Re: [SoftwareControlledHamRadio] LPF-Control PCB TX Logic at > U3 & U7 > > Oliver, I was having some kind of feedback/oscillation problems a > couple of weeks ago and traced it back to the T/R switch also. The > relays and associated parts all checked out but, when I removed the > 3-"0" ohm resistors that were there in place of the Low Pass Filter > (160M) and inserted the parts for the LPF the problem stopped. I > wanted to go back and remove the filter parts and place just two "0" > ohm parts at c14-c16 and a single cap at c-15 but never did. > Wondering if the oscillation problem boards have the "0" ohm resistors > and not the LPF filter in place. Maybe, I will try it later just > thought I would mention what I had, when you suggested a possible > feedback issue. > > Rick, KN4AIE > > ------------------------- > > FROM: [email protected] > <[email protected]> on behalf of Oliver KI3P via > groups.io <oliver@...> > SENT: Saturday, March 22, 2025 1:40 PM > TO: [email protected] > <[email protected]> > SUBJECT: Re: [SoftwareControlledHamRadio] LPF-Control PCB TX Logic at > U3 & U7 > > The situation I think we might have is that both TX_BPF_SEL AND > RX_BPF_SEL are HIGH during SSB transmit. This lets a little bit of the > transmitted signal leak through the TR switch back into the amplifier > input through the BPF selection stage, like this: > > These two lines are controller by GPIO register bank A: > > This register is set by the function call setBPFPath [2]; the code > there looks correct and unchanged. Scanning the code, it all appears > to be correct. Some judiciously placed statements like this will > confirm: > > Debug("Set LPF GPA state: "+String(LPF_GPA_state,DEC)); > > The fix that I implemented (major change to radio layout) to cure the > short that caused the burning smell has created a display freeze > issue, so I'm not able to test this myself right now. > > > > Links: > ------ > [1] http://www.villagrandpiton.com/ > [2] > https://github.com/KI3P/SDTVer066-9/blob/92d058bf13cd11e4f6f7ac35aa1e69b1d91b7c38/SDTVer066-9/LPF_Control_V12.cpp#L139 > [3] /g/SoftwareControlledHamRadio/message/33179 > [4] /mt/111571221/243852 > [5] /g/SoftwareControlledHamRadio/post > [6] /g/SoftwareControlledHamRadio/editsub/243852 > [7] > /g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy

My CW side tone is very loud, the volume setting in the CW menu does not have any affect. I am using V12 boards and running Ver 50.2. Any ideas on what to look for? Paul M. KC2TVJ

Hi Group! Maybe you need a few minutes break from the fun of the T41, so let me mention that I put together a SDR TRansceiver using the Teensy 4.1 and associated libraries. It is not intended as a big radio like is talked about here with all the home station stuff, but rather is a carry around, less than 1-lb radio. The whole story is summarized at http://www.janbob.com/electron/TinyTen/TinyTen.htm Enjoy! 73, Bob W7PUA

In my efforts to track a PA oscillation problem I noticed that in the SSB mode, the receive solid state switches (U1 & U8 on the LPF-Cntl) do not change state when the PTT is engaged but the transmit SSS's (U3 & U7) do change state. I'm using ver 66.4. In the CW mode, all 4 SSS's change state on key down. I would expect all the switches to change state in CW and SSB so that the BPF is used in Tx and Rx. Am I understanding this correctly? dave, n3ds

All: I can't seem to find Rob's transceiver ranking list. Anyone have a URL that works? Jack, W8TEE -- Jack, W8TEE

https://www.pjrc.com/sparkfun-to-manufacture-teensy/ -- 73 Greg KF5N

I went back to W8TEE's Ver 66-3 release and compiled, with no changes. It compiled and loaded and it makes it to the main screen. Serial monitor gets to Setup Complete. Totally frozen, no shut down. Memory Usage on Teensy 4.1: FLASH: code:302212, data:129248, headers:8852 free for files:7686152 RAM1: variables:177600, code:278728, padding:16184 free for local variables:51776 RAM2: variables:462400 free for malloc/new:61888 Seems like I've been here before, so I suspect a library(Display!). What is the correct version of the RA8875 library: Adafruit RA8875 https://github.com/mjs513/RA8875/tree/RA8875_t4 Neither fixes lockup, however the RA8875_4 makes it to the main loop. Nothing has changed hardware wise. Any suggestions? -- 73 Bob W3rdl Virus-free.www.avast.com

My Flex 6400 has found a new home. Jack, W8TEE -- Jack, W8TEE