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Re: K9HZ PA
Wayde,
The attenuator on the amp is made with 1/8 W SMD resistors, so 100mW would about the most power you could drive it with. It only needs 1 mW to drive it to full power so you would have to dissipate nearly all the 100mW of drive in the attenuator. I think you need to consider an external attenuator which absorbs most of the drive power. In any case, if you already have a 5W rig, why do you need a 20 W amp? For 6dB?
Gary
W9TD |
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Re: USPS Ban on China - Follow up...
开云体育I order a lot of stuff from that part of the world. ?No issues or differences from usual. ?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@... ? On Feb 22, 2025, at 1:48?PM, Doug W via groups.io <dougwilner@...> wrote:
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Re: K9HZ PA
Thank-you Bill,
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I'm working through the build, and would like to ask; Does anyone have some guidance on a good target input drive power to configure the input pad for? I have 2 K9HZ kits and I plan to build the first one, initially for use with a qrp rig, which can be set in 100mW increments from 0.1W to 5W. ( Although, I'm not convinced of the accuracy of those 100mW increments, necessarily).
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Is there a "typical" , practical input drive current that is used, a rule of thumb or something like that?
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Thanks,Wayde VA3NCA/AD2GX |
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Re: [SoftwareControlledHamRadio] T41 SDT Code Issues
Huh.... I also use a separate data server (with a hot spare... dual
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connections to drives that are mirrored) using Samba to backup all of my files (for my business)... and our 96TB video server in the house. I've got an old Dell tape drive that I make incremental backups as well. Looks like some of us are scared of data loss! Looks like you should be able to get you data back to at least a week ago... 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@... -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of jerry-KF6VB Sent: Friday, February 21, 2025 11:18 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] T41 SDT Code Issues On 2025-02-21 06:47, jjpurdum via groups.io wrote: Also, I have other distractions now. At some time yesterday my main*** That sucks. Did it die completely, or just lose data? Sometimes they can be read by putting the drive in the fridge. I have a unique system. I don't keep anything important on my desktop PC. Instead, I have a Linux server running the Samba suite that acts as a windows fileserver. I actually have three of those servers; two active, and the third being upgraded to a newer Linux. Also, I do an encrypted incremental backup to the cloud once a week. The server in use backs itself up to the second hot server every night. So far, I've been lucky. Have had some close calls, but never lost it all. My email queue goes back to 1989! Back then I didn't have real Internet. My PC ran a program called "UUPC" that dialed up another computer and transferred mail and netnews via the UUCP protocol. I had it on a 24 hour timer. In the middle of the night, it would come on for a few hours. UUPC was in the autoexec.bat. - Jerry, KF6VB |
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Re: [SoftwareControlledHamRadio] CAT
开云体育Like this? ? ? ? ? ? ? ? ? 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@... ? ? -----Original Message----- ? Or we could use one of the traditional serial ports built into the Teensy hardware. There are eight of them.? But looking at the Main Board schematic, I don't see much in the way of unused pins. ? On 2025-02-19 17:56, K9HZ wrote: > Here’s another thing.? There are other ways to interface USB to the > Teensy if you need more USB hardware.? The FT201, FT233, FT311, FT2222 > are all devices that sit on one of the I2C busses as a USB translation > device.? There appear to be Arduino libraries for all of these > devices. ? *** For low-performance USB serial - like CAT, that would be fine.? But then we wind up with two USB cables, unless we shoehorn a little hub into the radio somewhere.? I *really* like the idea of having one cable from the radio to the computer. ? ????????????????? - Jerry ? ? ? ? > > 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: [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 K9HZ > SENT: Wednesday, February 19, 2025 7:41 PM > TO: [email protected] > SUBJECT: Re: [SoftwareControlledHamRadio] CAT > > That’s a good idea and actually, I think I saw an article on someone > using a USB server device with their T41.? I don’t know how that works > but its out there… > > 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: [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 Mark J Culross > SENT: Wednesday, February 19, 2025 7:34 PM > TO: [email protected] > SUBJECT: Re: [SoftwareControlledHamRadio] CAT > > Jerry: could you just use the standard Serial + Audio USB > configuration on the primary microUSB port, then add an external > USB-to-serial adapter plugged into the USBhost port & use that > additional interface for your CAT control ??? Just a thought... > > Mark J Culross > > KD5RXT > > Sent from AT&T Yahoo Mail on Android [2] > >> On Wed, Feb 19, 2025 at 5:54 PM, jerry-KF6VB >> >> <jerry@...> wrote: >> >> 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 > > > Links: > ------ > [1] > [2] > > rowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal& > amp;af_sub2=Global_YGrowth&af_sub3=EmailSignature&af_web_dp=ht > tps://more.att.com/currently/imap [3] > /g/SoftwareControlledHamRadio/message/32805 > [4] /mt/111280742/243852 > [5] /g/SoftwareControlledHamRadio/post > [6] /g/SoftwareControlledHamRadio/editsub/243852 > [7] > /g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy |
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RF Board update.
开云体育BTW… the new stack of RF Boards here… have the following updates: ?
? This is not intended as a replacement for existing V12.6 RF boards… but rather convenience upgrades if you need a new RF board. ? I think the RF board is incredible.? It rivals many of the commercial radios I have in my radio room.? Lots of people here and all over the world helped with prototyping, building, suggestions and insight, and testing to make this so. ? ? ? 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: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? |
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Re: For you designer builders...
开云体育Yeah that’s where I am too… ? ? 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: ? 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 Phil Taylor via groups.io
Sent: Wednesday, February 19, 2025 9:01 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] For you designer builders... ? I was looking into this when I purchased all my parts. ? A lot of these devices like the Aliexpress ones don't have the matching pinouts for LMx17 - the Vi and Vo are wrong. The 78xx versions seem ok. The devices from that Audiophonics site seem ok but there is no actual datasheet - so are they?? Besides the are way expensive at 25 euro.? ? So be careful what you buy ready built. ? I think building your own is the way to go. ? ? Regards? Phil VK2KKZ On Tue, Feb 18, 2025 at 01:57 PM, K9HZ wrote:
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Re: For you designer builders...
开云体育Have you ever used one from aliexpress?? Interested to hear if they actually work… because they sell those replacements for less than what I can buy just the chips for. ? ? 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: ? 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 glenn percy via groups.io
Sent: Monday, February 17, 2025 7:41 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] For you designer builders... ? They pop up on Aliexpress at about US$4 |
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Re: For you designer builders...
开云体育Kind-of, yes! ? ? 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: ? 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 Bennett via groups.io
Sent: Monday, February 17, 2025 11:40 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] For you designer builders... ? A great thing about the LT3045 is that you can parallel them for higher current and even lower noise (with careful PCB layout). John Bennett AE0AM |
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Re: For you designer builders...
开云体育Yep.? I can get then for the same price here but I must order them for future delivery…? Yeah.? Make some small boards and… Fanny and Bob are both in the house! ? ? 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: ? 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 mk3msm via groups.io
Sent: Monday, February 17, 2025 10:51 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] For you designer builders... ? and in 1K lots they cost $3.37 each On 17/02/2025 16:28, John Bennett via groups.io wrote:
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Re: For you designer builders...
开云体育Yep that’s the ticket!? I had in the back of my brain designing a board identical to that little guy… that would simply replace the regulator and there it is!? ? I think I could do it for less than half that cost though…? If time permits, I’ll give making it a try.? It certainly would be a major improvement for us radio guys that use A/D and D/A converters in our radios! ? ? 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: ? 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 Bennett via groups.io
Sent: Monday, February 17, 2025 10:28 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] For you designer builders... ? Great idea - a French DIY audio company offers these for sale (not cheap): ? ? John Bennett AE0AM ? ? |
Gary
K9HZ
Wayde VA3NCA/AD2GX
JP McGinley