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Re: TTiny85 and Revers Polarity Protection
¿ªÔÆÌåÓýI think Oliver answered this perfectly but to reiterate¡ ? The Main board was designed so that when building it¡ you can select ONE of TWO options. ? OPTION 1:?? You can select the Reverse Polarity option¡ which is essentially the kit that Oliver and I are selling built into the Main board.? It does not allow reverse voltage to flow if you connect your radio backwards.? If you select this option, you CANNOT do option #2. ? OPTION 2:? This option is the soft-on-off approach to controlling the power to the radio.? Push the momentary contact button once and the radio comes on.? Then, later, push the button again momentarily and the power goes off¡ but before it does, it can run routines in the radio to do shutdown stuff¡ like put up a splash screen, save things you have selected to the memory card, etc.¡ then turn off¡ until the next push on again.? You don¡¯t get the reverse polarity protection of OPTION #1 using OPTION #2¡ BUT you CAN add one of our stand-alone reverse polarity kits and essentially get both for less than $10. ? The schematic show part positions for both options¡ and the BOM and build instructions have BLUE writing for one option and RED for the other.? The ATTiny85 is for OPTION #2 and was selected because it took up less board space than the flip-flops needed otherwise to do the same thing¡ and is programmable (!) for software timing and other things using its spare pins (like turning on and off the display at a different time¡ sequencing). ? ? ? ? ? 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: ? 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 Michael
Sent: Saturday, August 3, 2024 6:32 PM To: [email protected] Subject: [SoftwareControlledHamRadio] TTiny85 and Revers Polarity Protection ? Fellow ham and I are starting the main board consy. Following Dr. Bill's comprehensive instructions we are a little confused regarding the use of Reverse Polarity Protection along with the TTiny85. Option 3 states "...ATTiny85 was shipped with your V012 board sets. If you don't want to use this module, please populate the two parts shown in the blue box on the schematic and blue on the BOM..." Does this mean the TTiny85 provides Polarity Protection? I am thinking that if I don't want to use the TTINY85, then I should install the parts in red. Hope this makes sense ? |
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Re: BPF board
Nice! I'm working on a article for winding toroids. Could I use this image? I would give credit to you, of course. Jack, W8TEE
On Saturday, August 3, 2024 at 10:57:14 PM EDT, Paul KL7FLR <657subguy@...> wrote:
A long time ago winding a toroid for a balun wasn¡¯t too bad as they were large, easy to hold for winding and not too many at a time. Fast forward 25 years and holding these little buggers isn¡¯t so easy with arthritic hands and the number that needs to be wound. I made a simple tool to help me out and made winding a toroid a less of a pain. The top toroid is a T-37 and the lower is one for the bandpass board. One tool for many sizes although I did make another spindle for the larger sizes. These attach to a 3¡±x3¡± 3/4'¡¯ steel base with rubber feet so you don¡¯t chase it around when using it. The spindles are hardwood, your choice; oak, maple or whatever is at hand. A shallow groove in the spindle will allow you to pass the wire up for each turn then lifting the toroid up and slightly rotated and set back down to secure the wire. Rinse and repeat until done. I fear No toroid! Paul KL7FLR -- Jack, W8TEE |
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Re: 192kHz usb audio patch for Teensyduino - testers?
¿ªÔÆÌåÓýBut are you working with a V11 system or a V12 system? ? ? 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: ? 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 david mugridge
Sent: Sunday, August 4, 2024 3:31 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] 192kHz usb audio patch for Teensyduino - testers? ? Bill, ? >> What version of code are you modifying? ? I'm modifying Teensyduino V1.59, and modified a few files in the <core> section (). I've tested it on Windows Arduino 1.8.19 (portable mode) and Windows Arduino 2.3.2. ? Dave M0JTS ? |
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Re: BPF board
A long time ago winding a toroid for a balun wasn¡¯t too bad as they were large, easy to hold for winding and not too many at a time. Fast forward 25 years and holding these little buggers isn¡¯t so easy with arthritic hands and the number that needs to be wound. I made a simple tool to help me out and made winding a toroid a less of a pain. The top toroid is a T-37 and the lower is one for the bandpass board. One tool for many sizes although I did make another spindle for the larger sizes. These attach to a 3¡±x3¡± 3/4'¡¯ steel base with rubber feet so you don¡¯t chase it around when using it. The spindles are hardwood, your choice; oak, maple or whatever is at hand. A shallow groove in the spindle will allow you to pass the wire up for each turn then lifting the toroid up and slightly rotated and set back down to secure the wire. Rinse and repeat until done. I fear No toroid! Paul KL7FLR |
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Re: 192kHz usb audio patch for Teensyduino - testers?
¿ªÔÆÌåÓýNext main board revision¡Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Aug 3, 2024, at 3:14?PM, jjpurdum via groups.io <jjpurdum@...> wrote:
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Re: 192kHz usb audio patch for Teensyduino - testers?
¿ªÔÆÌåÓýI looked at this myself. ?I dont think it makes sense to run the complete radio that way¡ rather you would take the I/Q input and outputs from the RF board straight into the appropriate audio card in the computer, and then use [your fav SDT program here] to direct the audio card in the computer as its interface while using USB cat control to run the radio functions (set mode, frequency, t/r, etc). That actually works today just plugging cables in different places. ?Bice versa¡ if you have another SDT/ SDR that you want to use with the T41?main/display/ demod/mod.. you can do that too with a small bot of work.? Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Aug 3, 2024, at 2:16?PM, ken WA2MZE <wa2mze@...> wrote:
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Re: 192kHz usb audio patch for Teensyduino - testers?
¿ªÔÆÌåÓýWhat version of code are you modifying?Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Aug 3, 2024, at 10:33?AM, david mugridge <dave@...> wrote:
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Re: BPF board
¿ªÔÆÌåÓýRemember¡ you CAN use canned smd inductors and variable caps if you want to save time. ?You still have to tune the filters though. ?Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Aug 3, 2024, at 9:26?AM, JP McGinley via groups.io <j.p.mcg@...> wrote:
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Re: [AmateurRadioBuilders] BPF board
¿ªÔÆÌåÓýLooking good!Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Aug 3, 2024, at 8:59?AM, Jack, W8TEE via groups.io <jjpurdum@...> wrote:
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Re: 192kHz usb audio patch for Teensyduino - testers?
Again, I'm really bad at EE topics, but in all fairness, Al designed the T41 ADC processing 5 years ago and COVID was just starting to rear its ugly head. At that time, some high performance ADCs were almost $60 each, which seems out of reach at the time. Today, ADCs with 500ksps are around $15. My guess is that it would be doable now without breaking the bank. Jack, W8TEE
On Saturday, August 3, 2024 at 02:16:19 PM EDT, ken WA2MZE <wa2mze@...> wrote:
I was wondering about using the USB interface on the T41 as a "sound card" interface.? Then you could plug the T41SDT into your computer and run GNU radio.? Now I know the whole idea behind the T41EP software is a 'stand alone' radio that doesn't need a PC. However, it might be interesting to run it the other way as well. If in the future the hardware could be upgraded to faster ADC's in the receiver side (394khz sampling rate or higher) you would be able to see a wider slice of spectrum in the FFT display running under GNU radio.? A poor man's Flex radio? -- Jack, W8TEE |
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