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Re: Confirmation of T41-EP Open Source Licenses
#t41-ep
#licensing
here was no intent to limit the use of the code. Jack, W8TEE
On Sunday, April 27, 2025 at 09:44:33 AM EDT, Terrance Robertson, KN6ZDE via groups.io <tmrob4@...> wrote:
You can decline granting trademark rights under the license.? So, you could require they submit a test copy to you if they want to call it the T41, if that name was trademarked.? That has costs involved though and enforcing it would be expensive.? You could simply require vendors to submit a unit for testing if they want to be on the approved vendors list.? That doesn't even have to be part of the license.
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My problem with the last clause is that it appears to limit use of the code to anything but the T41 and without exceptions for hobby use.? I use the display portion of the code in my remote head.? I also use the code in my Beacon Monitor.? I don't think it's your intension that those uses be forbidden, but the "any and all other uses" phrase seems to do just that.
-- Jack, W8TEE |
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Re: Confirmation of T41-EP Open Source Licenses
#t41-ep
#licensing
Al and I wanted to avoid the issues
Deiter faced when imitators started cloning his design but with little
to no QA. He had an "Approved" list of vendors where they had to given
them a unit for testing. Our hope was to avoid tying the T41 name to a
poor implementation of it by having them notify us first and submit one
for testing. I would still like to see that in place for commercial
units, but don't know a better way to state it. Jack, W8TEE
On Saturday, April 26, 2025 at 07:03:45 PM EDT, Terrance Robertson, KN6ZDE via groups.io <tmrob4@...> wrote:
I guess I'll answer my own question.? Looking back at SDTVer010.ino, we have the following copyright block:
?
? This comment block must appear in the load page (e.g., main() or setup()) in any source code
? that uses code presented as whole or part of the T41-EP source code. ?
? (c) Frank Dziock, DD4WH, 2020_05_8
? "TEENSY CONVOLUTION SDR" substantially modified by Jack Purdum, W8TEE, and Al Peter, AC8GY
?
? This software is made available under the Freeware license agreement, which prevents the use of
? the software for commercial use. If any commercial use of this software is planned, the interested ? parties must first get written approval from Jack Purdum, W8TEE, and Al Peter, AC8GY. User for non- ? commerical use is acceptable. ?
? Any and all other commercial uses, written or implied, are forbidden without written permission from
? Dr. Jack Purdum, W8TEE, and Al Peter, AC8GY. ?
Sometime later the copyright block was modified to adopt the GNU GPL v3 license which was required as the T41 software is derived from the Teensy Convolution SDR software which is covered by that license.? The current copyright block closely follows the above, with a few edits mentioning the GPL license.
?
? This comment block must appear in the load page (e.g., main() or setup()) in any source code
? that uses code presented as whole or part of the T41-EP source code. ?
? (c) Frank Dziock, DD4WH, 2020_05_8
? "TEENSY CONVOLUTION SDR" substantially modified by Jack Purdum, W8TEE, and Al Peter, AC8GY ?
? This software is made available under the GNU GPLv3 license agreement. If commercial use of this
? software is planned, we would appreciate it if the interested parties contact Jack Purdum, W8TEE, ? and Al Peter, AC8GY. ?
? Any and all other uses, written or implied, by the GPLv3 license are forbidden without written
? permission from Jack Purdum, W8TEE, and Al Peter, AC8GY. ?
I was interested in what uses were contemplated by the last clause.? That would be an interesting technical discussion, but it really doesn't matter.? The clause is invalid.? Section 7 of the GPL3 license says in part:
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All other non-permissive additional terms are considered "further restrictions" within the meaning of section 10. If the Program as you received it, or any part of it, contains a notice stating that it is governed by this License along with a term that is a further restriction, you may remove that term. ?
The cleanest way to address this would be to remove the clause from the official versions of the T41 software.? Absent that, per the GPL license, any user can remove the clause from their derived version.
?
-- Jack, W8TEE |
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Re: Adding PTT to Main Board
¿ªÔÆÌåÓýIt works but there is a problem with that.? It means the digital and audio grounds are now the same. ? ? 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 Tom - AJ8X via groups.io
Sent: Saturday, April 26, 2025 10:20 PM To: [email protected] Subject: [SoftwareControlledHamRadio] Adding PTT to Main Board ? I put a jumper on the V12 Main board to add PTT to the microphone jack. I'm finding it handy. |
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Re: More T41 V12 Results
¿ªÔÆÌåÓýOh BTW the 20W drives the 100W module to 110W with 8W. ?So its overkill for the 100W PA.?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 Apr 25, 2025, at 11:06?PM, K9HZ <bill@...> wrote:
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Re: More T41 V12 Results
¿ªÔÆÌåÓýThe amp itself (actually the first gain stage) is the limitation.? That was done on purpose to make the amp bullet proof (short or open the output to the antenna and things are just fine).? You CAN drive the final stage harder by increasing the feedback resistors on the OPA device.? I was more interested in longevity.? ? When you sell kits that for amateur builders, the fastest way to lose the builders focus is to design the PA (or any other part of the radio) so that its not robust to inadvertent mis-operating.? The uBITx and the sBITx falls into that category.? The final transistors on those radios pop like popcorn¡ Farhan when through several cycles of redesign to keep his PA transistors intact when the operator mis-stepped.? A lot of people were mad over that and their radios went up on the shelf after the first or second incident.? I don¡¯t design stuff like that. ? I design stuff so that the poor kid in the Caribbean that can barely afford antenna wire much less parts for his new radio if it blows up¡ doesn¡¯t experience a failure that puts his radio in the closet.? It¡¯s easy to do¡ its just that very few people do it because they want every Last watt out.? Truth is, my 20W PA is capable of about 45 watts¡ and will even operate class A (if you really want a very linear signal from it¡ just by boosting the bias).? But all of this reduces the safe operating margin.? So I under-rate and under-run the amp and keep everyone happy. ? ? 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 Nate Reik N8BTR via groups.io
Sent: Friday, April 25, 2025 2:33 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] More T41 V12 Results ? On Sat, Sep 9, 2023 at 10:01 AM, Albert Peter wrote:
What limits the current in this amplifier? Something on Bill's amp board or within the rest of the T41? ? -Nate? N8BTR? |
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Re: New book
You should be able to return them for a full refund. When you reorder, make sure the ad says that the book ad says it was publish on April 16, 2025. When they ask for the reason for the return, pick the "wrong item sent' option. Jack, W8TEE
On Friday, April 25, 2025 at 10:27:28 PM EDT, John Zhong via groups.io <john138@...> wrote:
I bought two paper copies of the "Revised Edition" books from , is it possible to get an updated copy for free? -- 74 John VA6kHz On Thu, Apr 17, 2025 at 1:38?AM Greg KF5N via <greg.electricity=[email protected]> wrote:
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Jack, W8TEE |
jjpurdum
K9HZ
Tom - AJ8X