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Re: Codec & ADC's
¿ªÔÆÌåÓýYou probably know this but there have been several papers written on the weak signal performance of A/D and D/A converters being a function of the quality of the voltage reference quality.? Noise at the reference (the reference is generated internally with the PCM1808) that comes in via the Vcc power supply line sets the zero signal bit range of the device. ?That does beg the question of how clean the power is that was used in the experiment (to correlate to the zero ¡°shorted¡± signal level).? I¡¯ll have to try this myself to see because ¡®ve been looking at some new low noise VRs for this very reason. ? ? Dr. William J. Schmidt - K9HZ J62K(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 Bob Larkin
Sent: Saturday, May 3, 2025 5:40 PM To: [email protected] Subject: [SoftwareControlledHamRadio] Codec & ADC's ? I recently did some ADC measurements in preparation for an update to my Audio VNA.? I mention it here as I think it has some stuff of interest to the T41 project.? The measurements are on-going, but as of now included the SGTL5000 (ADC side)and the PCM1808.? I believe it was the T41 use of the PCM1808 that got me to look at that part---thanks.? The web page for the study is ? For this group, one interesting element that came out is that the PCM1808 produces 24-bit output data, but this is lost back to 16 if you input I2S via the Teensy AudioInputI2S followed by a Q15 to F32 conversion.? If you do the input via AudioInputI2S_F32 of the , it will include all 24-bits automatically, as well as saving a conversion. ? ?Questions, comments and corrections are all appreciated.? Bob? W7PUA |
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Re: Initial Test of Main V12.6 board
¿ªÔÆÌåÓýJohn¡ ??Two options. ? If you programmed the teensy separated from the MAIN board and ran the teensy + hat off the just the USB cable powering the teensy thru the computer¡ and it doesn¡¯t see the hat¡ either the hat is bad, or the hat is not making connection with the pins on the teensy, or the teensy is bad.?? That¡¯s all there is. ? If the teensy is now on the MAIN board, build the front panel board and cable it up to the main board.? see if it sees that. ? ? Dr. William J. Schmidt - K9HZ J62K(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 John Owens K1JO via groups.io
Sent: Saturday, May 3, 2025 9:03 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Initial Test of Main V12.6 board ? Still no I2C device found :( I programmed the board with just the Teensy, adapter, and Audio board. Arudino IDE notice a? new board and port and did some automatic updates.? |
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Re: Initial Test of Main V12.6 board
Still no I2C device found :(
I ohmed out all the connections between the stacked header pins through the Teensy and to the Teensy Audio adapter. I found some intermittent connection issues, which I think is due to the Tayda A-4662 male pin set for the Audio Hat. I noticed that Tayda sent me a substitute part, and I noticed that the pins were not as long a normal pins. So, I started over with a new Teensy 4.1, offset Audio adapter board and Teensy Audio board and longer header pins. I took lots of time to ensure that all solder joints were good and then used an ohm meter to check each pin from the stacked header pins to the Audio board. All were good. I programmed the board with just the Teensy, adapter, and Audio board. Arudino IDE notice a? new board and port and did some automatic updates.?
The is started reporting no I2C device found. I'm not sure where to go from here...2 strikes. I am using Arduino IDE version 2.3.6 Maybe I am missing a library?? ?
Scanning Wire ...
No I2C devices found
?
Scanning Wire 1 ...
No I2C devices found
Scanning Wire 2 ... No I2C devices found ? |
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Re: t41 main board j22 connections
¿ªÔÆÌåÓýOk well I¡¯ll be selling boards and kits in spot #2607 and I can put up a sign to direct them to your booth for those cables if you want¡ ? ? Dr. William J. Schmidt - K9HZ J62K(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 Tim O'Rourke via groups.io
Sent: Saturday, May 3, 2025 7:59 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] t41 main board j22 connections ? Yes I will have 2 flea market spots in the new area, paved near where the EMC truck usually parks? Tim |
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Re: t41 main board j22 connections
¿ªÔÆÌåÓýYou be at Hamvention? ? ? Dr. William J. Schmidt - K9HZ J62K(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 Tim via groups.io
Sent: Saturday, May 3, 2025 6:49 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] t41 main board j22 connections ? If you need a nice clean jumper I have a lot of these. anyone who wants one I will send on my nickel. Tim? |
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Re: Initial Test of Main V12.6 board
¿ªÔÆÌåÓýIt should be finding the hat at WIRE at 0x0A¡ ? Its either not recognizing WIRE or its shorted somewhere. ? You can remove the teensy and hat off (as one unit)¡ jump the voltage tab that you cut in the instructions (UNTIL YOU REINSTALL THE TEENSY BACK ON THE MAIN BOARD), plug in the USB cable as if you were programming the Teensy, but rather to supply power and see if 0x0A shows up.? If not you have it located in a connection between the hat and the Teensy. ? You can also just build a small section of one of the other boards that includes the I2C stuff¡ cable it to the MAIN board and see if it sees it.? The logical choice is the Front Panel¡ and you just need to install the IC¡¯s, connectors, and the jumpers on the electronics board of it¡not the switches to see if it at least can read that board. ? ? Dr. William J. Schmidt - K9HZ J62K(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 John Owens K1JO via groups.io
Sent: Saturday, May 3, 2025 2:32 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Initial Test of Main V12.6 board ? It is still reporting No I2C devices found :( |
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Re: Latest DSP and SDR book color images
FDIM should be on every QRP'ers Bucket List. You can hit the conference and Dayton Hamvention all in one swoop! Jack, W8TEE
On Saturday, May 3, 2025 at 01:27:49 PM EDT, Duane B via groups.io <dbrantley@...> wrote:
Seems like a pretty interesting even.? Thanks for the info. Duane - K5CA On Sat, May 3, 2025, 12:49?PM jerry-KF6VB via <jerry=[email protected]> wrote: On 2025-05-03 09:17, Duane B via wrote: -- Jack, W8TEE |
K9HZ
John Owens K1JO
jjpurdum