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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

Hi Jack, do you have any links where we can see that info about the *pi pico 2*? afaict, news has been released that the original Pi Pico has been bumped from 133MHz to 200MHz. I don’t see anything about the Pi Pico 2 though? Having said that, the Pi Pico 2 is interesting because… - it already clocks at 150MHz - it has FPU and DSP on the arm cores - is available as a ‘W’ version already (for about ?6.60 in the UK) with 4MB flash and 520KB RAM I won’t be surprised if a speed bump for Pico2 is announced later, but it has taken some time for that to come for Pico(original), and the Pico2 has not been out that long, so I guess we wait and see. Graham, 2E0WRW

Here is a revised version of the V66.4 calibration PDF. Al AC8GY

This version fixes the button response problem in Receive Cal and a couple of other small issues. Al AC8GY

Hi all, I have a set of V010 boards and the original? issue of "Software Defined Radio Transceiver". If I build the boards in accordance with the book, will I get a functional radio? 73 John M0JBA

I installed all of the required libraries and compiled this version. Looks good, but when I tried to do the Receiver Calibration, it worked like the directions(some of the switches were mapped differently), but when I pressed Select to save, it returned to the normal display with a lot of the text from the cal screen overlaid and was non functional. I had to cycle power to get it working again. I tried several bands and got the same behavior, however the I & Q corrections were stored in EEPROM. Do I just need to reset the Teensy to Blink and try again, or is there a S/W problem? -- 73 to you! 73 Bob W3RDL Virus-free.www.avast.com

Can someone please explain how to turn back on 160 metres and turn off any other band in SDTVer053? I've had a go at it but it seems there are several tabs involved. Roger G8JWT

When you get to L292 3.6 uH 20 38 T37-10 Black 20" of #28 wire, 38T on T37-10 You might want to drop down a wire size to #30 I had trouble getting the ones done with 32 turns let alone 38! #30 I was able to get 38 turns. Frim memory wire size is not that critical just number of turns. I will send SA plot of 30M later to see if it made a difference. These filters are fairly wide (I plotted 80 and 20m so far) to start with so I doubt there is much difference. Tim W4YN

here's the video for it..3 FDIM 2022 Al Peter and Jack Purdum 'T41-EP CW Decoder' FDIM 2022 Al Peter and Jack Purdum 'T41-EP CW Decoder' On Sunday, February 23, 2025 at 01:08:08 PM EST, Kees T via groups.io <windy10605@...> wrote: Jack, Thank you for sending the link but I'm having trouble playing the video. Do you happen to have a copy of the presentation you could forward ? I was trying to get a Digital Interface Text Transceiver to perform Texting functions like many do with their iPhones today. The idea was to add a RF section to transmit actual Morse Code so the Text Transmissions could be manually copied. The Transceiver would require no speaker, no headphones, no key.....no audio at all. The only human interface is a keyboard on the display, Text Received, and Housekeeping data. Since you would want to reduce the RF bandwith as much as possible reduce the Dv/Dt, etc. Call that "Fast CW". Using an external ADC and FAST Microcontroller to perform ANALOG signal processing .....is it a DOT or a DAH, remove unwanted noise, compensate background noise, etc, etc and be able to dig the signal out of the muck. Only then to you confirm it was the letter "P" and send it on for display. Weak signal detection NOT nearly as well as WISPR and other small signal algorithms but an improvement. Strong signals with minimal interference are always easier to decode. 73 Kees K5BCQ -- Jack, W8TEE

All: First, my thanks to all who tried to help me solve my drive D problem. My first attempt was to remove the connector, clean and D-ox it, and replace it see what happened, Happy Day! It came up immediately after which I backed it up to my backup drive. 929,000+ files and almost two hours later, the backup was complete. I've run several tests and all seems well. Again, thanks for having my back... Jack, W8TEE -- Jack, W8TEE

Folks, Looking for some ideas for an issues I am having compiling SDT code, to be clear it compiles and loads just fine but when running I get very jittery performance and a sort of "bip bip bip bip bip bip" from the audio, the movement of the waterfall display is in sync with the bip bip effect. In an effort to troubleshoot this I configured a new Arduino IDE 2.3.4, remove all of the old arduino library folders out of c:\users\.. so that I would have a clean slate, then installed Teensy 1.59, then all of the various required libs as per below... Using library Adafruit MCP23017 Arduino Library at version 2.3.2 in folder: N:\arduino\libraries\Adafruit_MCP23017_Arduino_Library Using library Adafruit BusIO at version 1.17.0 in folder: N:\arduino\libraries\Adafruit_BusIO Using library Wire at version 1.0 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\Wire Using library SPI at version 1.0 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\SPI Using library Chrono at version 1.2.0 in folder: N:\arduino\libraries\Chrono Using library Regressino at version 1.5 in folder: N:\arduino\libraries\Regressino Using library Regression at version 1.0.1 in folder: N:\arduino\libraries\Regression Using library Adafruit GFX Library at version 1.11.11 in folder: N:\arduino\libraries\Adafruit_GFX_Library Using library OpenAudio_ArduinoLibrary-master in folder: N:\arduino\libraries\OpenAudio_ArduinoLibrary-master (legacy) Using library Audio at version 1.3 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\Audio Using library SD at version 2.0.0 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\SD Using library SdFat at version 2.1.2 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\SdFat Using library SerialFlash at version 0.5 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\SerialFlash Using library Time at version 1.6.1 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\Time Using library Metro in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\Metro (legacy) Using library Bounce in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\Bounce (legacy) Using library Timer at version 1.2.1 in folder: N:\arduino\libraries\Timer Using library RA8875 at version 0.7.11 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\RA8875 Using library EEPROM at version 2.0 in folder: C:\Users\peter\AppData\Local\Arduino15\packages\teensy\hardware\avr\1.59.0\libraries\EEPROM Using library ArduinoJson at version 7.3.0 in folder: N:\arduino\libraries\ArduinoJson The settings are 600MHz, Faster with LTO and Dual Serial, it all compiles fine and uploads but I still have the issue as per above, now to be clear this is the 064 build of the code which I don't think has been released, BUT I had kind of similar issues using the 050 version of the code whereby if the SDR started up in the 20M band and I moved to the 40m band and then back to the 20m band I would get the same jittery performance, switching the SDR off and back on again it would start up just fine on the 20m band. Similarly if it booted in 40 or 80 meters and I moved up to anything higher than 10MHz I would get the same jittery performance until the SDR was powered off and on again. REALLY weird behavior. Now out of interest I loaded the hex file Jack posted a few weeks back for 064 and the SDR works perfectly with this image, no jittery performance at all, so this is definitely an issue with my build environment or something I am doing wrong in the config, can't think what though and moreover the build environment should be a blank slate. I just have the Main and RF boards at present. Kind of stumped and looking for ideas, can anyone spot an anomalies in the

OK, we're apparently running it at 192kHz. This is supported by the PCM5102 DAC device. Right now, I am looking through USB specs to figure out how to have the radio tell the PC that it's 192ksp. In the "Digital Audio Interface Properties" screen, there is a dropdown menu "Select the sample rate and bit depth to be used when running in shared mode". But it's grayed out. This tells me that Windows should at least be capable of using other bitrates than the standard 44.1ksp. I found an audio spec on usb.org: https://www.usb.org/sites/default/files/audio10.pdf Using Wireshark, I was able to find the exact USB packet where the radio tells the PC (erroneously) that the sample rate is 44100 samples per second. AND I found it in the USB teensycore. Gonna change it now, see what happens. - Jerry, KF6VB

So I have the two serial ports AND the audio device working. HOWEVER, the audio received by the PC is garbled. I think there is a sample rate mismatch. Are we running the Teensy audio library at a high rate? Even for audio output? - Jerry, KF6VB

Just a thought. The MAR-3SM+ Amp used for the CW transmission was biased at fairly close to the recommended current of 35mA. But now that R73 is added across C73 this has resulted in a reduced biasing current of nominally 17mA. I have changed R56 from the 1k8 to a 2k7 to bring the biasing back to just under 35mA.

Jack.. .you said you want a new V12 RF board? 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@...