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Rob Sherwood rankings??
2
All: I can't seem to find Rob's transceiver ranking list. Anyone have a URL that works? Jack, W8TEE -- Jack, W8TEE
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I removed the Arduino IDE 2.3.4 and reinstalled it along with Teensyduino and the libraries. I compiled SDTVer50.2 and it loaded and ran. Everything worked. Thought problem was fixed so I compiled and loaded SDT Ver66.7. It froze at random points every time I restarted it. I went back to the SDTVer50.2 and recompiled and it froze this time. What's going on? Then I realized that the first time I compiled the SDTVer50.2 I had forgotten to change the compile options to those suggested (Faster with LTO, 528 MHz and Serial). It was set for Faster and 600MHz. I compiled again with the Faster and 600MHz and it ran fine. I tried compiling SDTVer66.1 with Faster and 600MHz. Compile failed with an out of memory message. Tried SDTVer66.1 with Faster with LTO and 528MHz. Compiles but freezes. It ran prior to this, hardware wasn't changed, so I don't know what it takes to run the Ver66 code. Is Arduino IDE 2.3.4 what others are using? 73 to you! 73 Bob W3RDL Virus-free.www.avast.com
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T41 Announcement from PJRC
2
https://www.pjrc.com/sparkfun-to-manufacture-teensy/ -- 73 Greg KF5N
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T41 Locking up again!
7
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
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Flex for sale -- sold
My Flex 6400 has found a new home. Jack, W8TEE -- Jack, W8TEE
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The transmit attenuator is working in that the amount of attenuation is able to be adjusted by the setting in the Menu. However at the 0dB attenuation setting I am getting -3dB. I have a 50 ohm load on RF_OUT (J6) on the RF Board. I am testing this on CW and the peak to peak signal (ignoring overshoot) going into the attenuator chip (U12) is 980mV but the peak to peak signal out is only 696mV. Has anyone else measured the performance of the transmit attenuator?
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Hey yall, I've built my boards and have them all hooked up. I've started with receiver checkout, and unlike my V11 which was amazing !, I have a lot of noise, specially on 40M. I'm not in an ideal environment yet, but the behavior is so different than V11. I can pick up very strong CW signals (one!) and a spanish AM broadcast at 7.35 something. So in the process of checking things out, I hooked up my SA to TX out on the RF board and TXed SSB, which looked fine. Then I switched to CW, and the freq was good but when I released the key and the RX returned, I got this. 25MHZ, and 3x, probably higher harmonics too. Square wave! These pop up after the first time I key the TX and remain. I'm running V50.2, metal chassis. This appears in slightly different forms forms all bands, 160M-6M, but the spurs always appear at 25MHz .... I have other integration issues I have to resolve in the mean time, but what's up with this? Thanks Mark KU3O
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All, I have been working on CAT ( remote control ) for the T41. I re-architected it to a data-driven approach that is much cleaner and will be easier to maintain and expand. I have the basics running: read & set the frequency, read & set the volume and mike gain, set the operation mode, make it transmit. It is an emulation of the Kenwood TS-2000. There is a LOT of stuff that we don't do yet. I have given the code to Jack. I hope it winds up in the permanent archive. Right now, I am getting nowhere fast with the next step: piping audio over the USB. With that, we would be able to run digital modes with nothing but a USB cable between the radio and a PC. USB function is selected by the "USB Type" pulldown at the Arduino IDE. There are various combinations of functions, but not the one that we need: two serial ports, plus audio. One serial port for the teensy uploads & Serial printf()s, a second serial port for CAT control, and an audio port. The code that implements these USB functionalities is buried in the Teensy "core" - the actual TeensyDuino code. In my system this is at: c/Users/Jerry/AppData/Local/Arduino15/packages/teensy/hardware/avr/1.59.0/cores/teensy4. The definitions of the USB choices are in usb_desc.h. It's basically a big array of #define's. Lots of sets of #defines, each set in an #elif section. ANYWAY, I hijacked the "USB_TRIPLE_AUDIO" section and replaced the third serial port with audio. Big fail. It compiles and loads, but then the "composite USB device" does not start, there not only no audio, there are no serial ports. Without serial ports, I have to hit the button on the Teensy to upload new code to it. I'm at a bit of a loss as to how to troubleshoot it. USB is pretty complicated...and no debugger. Can't even do debug printf's. One possibility would be to hook up a not-USB serial interface to a couple of teensy pins. Or do what I did once upon a time...find an unused I/O pin and have it emit morse code. The Teensy is limited to 8 USB "Endpoints". That limits the number of USB devices you can have active. Two serial ports plus audio maxes it out. Which is too bad. There's also a simulated disk drive, which could come in handy. Any USB experts out there? - Jerry, KF6VB
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T41 Spreading the word
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Here is the attachment Jack, I recently introduced my cousin, NJ9S, to the T41 project. He's a member of the INDIANA CW SECTION NET and today I received the attached net's monthly bulletin. I thought you'd like it. 73 Rocco, WJ6U
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T41 Spreading the Word
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Jack, I recently introduced my cousin, NJ9S, to the T41 project. He's a member of the INDIANA CW SECTION NET and today I received the attached net's monthly bulletin. I thought you'd like it. 73 Rocco, WJ6U
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Flex 6400 for sale
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All: I'm selling my one-owner (me), smokeless environment, Flex 6400, mainly because I rarely use it. All my activity lately is QRP, even though I still have an old FT891 if I need more power than 20 or less watts. It's three years old, but probably has less than 20 hours on it. It's in mint shape with no scratches or dents. I include the Flex 6400, the mic, an Anderson Power Pole cable, and I'll put the software on a flash drive. I never saw the need to update the software, so that's all original, too. I prefer a pick-up deal and am willing to drive up to 100 miles from Cincinnati to deliver it. Unfortunately, there are people out there who take delivery of equipment, strip out key parts, and then try to return it. As a result, this a cash-only deal with no returns. I realize that sounds harsh, but I got burned a few years back. As for me, I'm too easy to find to try and screw anyone over. The price is $1750, delivered. If someone wants to buy outside that radius, the buyer pays shipping and insurance charges. Interested parties should contact me at jjpurdum at yahoo dot com. Jack, W8TEE -- Jack, W8TEE
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Bill's SSB Contest Station 28.452
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Just worked St Lucia on 10M with my T41, the signal is hammering in to south Florida. I used an MFJ loop antenna, so my radiated power was probably on the order of 1 watt. The contest station call is J62K. -- 73 Greg KF5N
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T41 transmit died
So - I was trying to break in to one of those endless 40M roundtables. They weren't hearing me. Even with the amp. Looked over at the power meter - zero output! Huh? Switched to CW, hit the key - normal output. Stuck my oscilloscope on the IQ inputs to the RF card - no talky-waveform. OH, no! Did something break? Do I have to do hardware troubleshooting? Waah! Nope, I don't. The problem is the transmit equalizer. For some reason, if you turn it on, it sets all the bands to zero. Set them up properly, go back to transmit...and they're zero again. Guess I'll upload Al's latest and see how that does. WRT equalization: I'd like to have a couple quick-modes for that: "Ragchew mode" - nice flat response, mellow lows - and DX/Contest mode - lows suppressed, mid-highs accentuated for punch. Maybe I'll code something. - Jerry, KF6VB
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Feedback into T41
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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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[AmateurRadioBuilders] RP Pico 2
5
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
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[AmateurRadioBuilders] Alternative to Pico?
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*** Hardware debug? - Jerry, KF6VB
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RP Pico 2
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All: I just read that the RP Pico 2 is now capable of running at 200MHz, up from 133MHz earlier. Using CMake, the new speed setting in the compiler is a symbolic constant: PICO_USE_FASTEST_SUPPORTED_CLOCK=1. I don't know if the Arduino IDE recognizes this or not. There's been interest here in using the Pico as a second I/O processor in the T41. The Pico W has 26 I/O pins, 2Mb of Flash, and WiFi/Bluetooth support. No price was given for the Pico 2 nor did it say anything about WiFi/Bluetooth support, but the standard Pico W is about $8-$10. If I see additional info, I'll post it here. Jack, W8TEE -- Jack, W8TEE
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I was furtunate enough to received from Ron AG1P a T41 kit back in December of 2023. The plan to get to it in early 2024 didn't work out, I've just this last week gone through the box and have a good start on the book. Before I dive into building it are there modifications or other that I should do right away? The 5 inch display and other not included in the box I should get on order ASAP. Retirement should have happened in 2020, hopefully this later this year. Ron VE8RT -- Ron VE8RT <ve8rt@...>
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T41 BPF 6m confusion
3
I started to wind the coils for the 6m band and am confused about L601, L603, and L605. The directions say L601 and L605 are 39nH, 5" 24AWG, 5 turns on a 1/8" drill bit. However, L603 is 24nH, 4" 24AWG, 7 turns on a 1/8" drill bit. How can 7 turns require less wire than 5 turns and how can 7 turns have less inductance than 5 turns? Bob W3RDL -- This email has been checked for viruses by Avast antivirus software. www.avast.com
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Just some Friday sharing¡ Here is a finished dual encoder board with 3D Printed knobs (all out on the GITHUB). Replaced TWO encoders. One ribbon cable from the encoder board to the Fron Panel Electronics (FPE) board (one of 8 possible FPE boards BTW!). I guess I should make a video of the combo AF/RF gain on one encoder¡ 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@...
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Sat 8:39am
Sat 8:39am