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The files for All Projects generated in this forum are housed here: Https://github.com/DRWJSCHMIDT/T41

Hi all I have just completed my first 20 amp build. This is my first foray into surface mount soldering and I think all has gone well. Really cool stuff. I am building this amp to accompany a Hermes Lite to turn it into a full 15w blowtorch. The Hermes has an "RF Out" that bypasses the internal 5 Watt PA. I have measured that output on all bands. It ranges from 72mws on 10 meters Down to 42mw on 40 meters. My hunch is to calculate the Pi Attenuator for 41 mw. Is that a good bet? Here are my numbers - check me out and let me know what will be best. I failed Algebra 2 in High School. To attenuate 42 mw to 1mw, I need to attenuate 41mw or 16.12 db The values I come up with are 68.5276 156.026 68.5276 So real values 68 160 68 Does this look right to you guys ? What would you all suggest? Thanks again for this great group. Looking forward to building the T41 ! 72 David W0NP

After HamVention, we have a few signed copies of the latest version left over. We are offering them for the HamVention price of $40.00 + USA shipping of $8 for USPS media rate. (a bit slower, but lots cheaper). Note: Amazon sells the non-signed copies for $5 more. Outside the US, international shipping rates apply. If you want one, please: Send a private note to me with your name, address and how you would like the book personalized (Name & Call) This will verify that we still have copies. I will reply with mailing information Then send a check for $48.00 to me at the address specified in the reply. We have limited quantities, so first come, first served. We sold a bunch at FDIM and Hamvention, but some still remain. Al AC8GY

On Sunday, May 18, 2025 at 07:25:46 PM CDT, Jack, W8TEE via groups.io <jjpurdum@...> wrote: This is a good video and should convince others that soldering SMD parts to a PCB isn't that tough. Keep in mind, this is a difficult part to solder to a board. By comparison, a 1206 SMD resistor or cap is child's play. This technique can also be used on the Si5351 which is probably one of the hardest parts to solder in the T41. If my fat fingers and poor eyes can do it, anyone can. Jack, W8TEE On Sunday, May 18, 2025 at 07:05:43 PM EDT, Phil Taylor via groups.io <philbyt1@...> wrote: John This may help. This guy uses an alternate method. Microscope is an absolute necessary item. One extra thing I do is add some flux paste to the chip edge before running the soldering iron along the pins to neaten and remove any bridges. Easy Solder Paste Technique without Stencil Regards Phil VK2KKZ -- Jack, W8TEE

I Just a few boards left at Hamvention. When they are gone its back to mail order sales. Drop by and get what you need. Ps i also have 7 signed (by Jack and Al) third editions of the book available at a discount from the Amazon price!!! 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@...

Hey everyone! Tim, W4YN donated some very nice 3 wire pre-made cables, twisted, to be used to connect the teensy audio hat to the main board (the 90 degree pins). I will include these free of charge… one with each main board. Thanks Tim! 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@...

I am currently at Hamvention with a plethora of boards and kits. All set up in booth #2607 just across the floor from ICOM. 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@...

As of close of business today, I’ll have to stop talking board and kit orders for the T41 and associated electronics. I’m preparing for Hamvention now. We will have plenty of boards, kits, and books there. Our booth was moved from Building #4 into Building #2 this AM… now in a very nice spot… #2607. In with many of the international groups ad the ARRL. Very excited to be there. In any case, if you have orders, please get them in by close of business today. Otherwise catch us at Hamvention… or wait until the week after Hamvention. Dr. William J. Schmidt - K9HZ J62K(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@...

I shipped the UK/EU T41 V12 /K9HZ /K9HZ+KI3P boards and kits order to Andy Rutter today for sales and distribution in that region. Thanks Andy! And I really appreciate everyone’s patients with me in solving the shipping issues in crazy times. The tracking says the package should arrive in 4 days. Please take it easy on Andy over there as I know what it’s like when boards and kits are announced for sale… The emails never stop! Dr. William J. Schmidt - K9HZ J62K(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@...

...with my repaired T41. Good report from a station in Oregon. Power out was about 13W. With my homebrew LDMOS linear - 950W. - Jerry, KF6VB

Wow… $66K for 100 diodes… 100pcs 1N4007 1A 1000V Rectifier Diode | eBay Dr. William J. Schmidt - K9HZ J62K(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@...

All, As you may remember, my T41 has been oscillating on all frequencies above 20M. Today, I replaced U8, the first analog switch in the receive path on the K9HZ LPF card. Problem solved, no more oscillation. To get access to U8, I removed all four antenna relays. When I put it back together, I installed only one of them - because I only use it with one antenna. Luckily, the needed antenna relay is the farthest one from U8. So the next time it pops, I should be able to replace it without removing any relay. I'm not the only person who has fried U8. Why does it break? I can only guess that somehow, Big RF got into the receive input. Sure would be nice if I could protect it somehow.... - Jerry, KF6VB

John Owens K1JO <johnowenschina@...> added folder /BuyDisplays DataSheets

For anyone that wants them… FREE… I have hundreds of pill bottles.. several different sizes. Good for screws and washers, organizing parts, etc. They are yours for the taking. Dr. William J. Schmidt - K9HZ J62K(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@...

I think my notes are getting caught somewhere in someone’s spam folder so I’ll post this in the forum hoping that you both get this note. Dr. William J. Schmidt - K9HZ J62K(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@... From: Dr. William J. Schmidt <bill@...> Sent: Saturday, April 26, 2025 3:08 PM To: 'mikebales73@...' <mikebales73@...> Cc: 'drexful@...' <drexful@...> Subject: FW: [AmateurRadioBuilders] Pill Bottles Hey Mike… two things. If you are going to Hamvention (Dayton), I can bring them in my luggage so they really cost you nothing… I’ll be selling the 20W kits there and there will be no postage or paypal fees there. The pill bottles are junk (although only once used) as far as I’m concerned so I don’t want anyone to spend any money shipping them. The other thing, I got a note from JJ (cc’d on this note) who is in the process of adding that 20W PA to his sBITx and could use a guiding hand in how you did yours since I’m a little indisposed getting ready for Hamvention at the moment. I suspect what he will want to know it where you tapped in to get: The input to the PA The output from the PA Where the 12V came from, And where you tapped in for the PTT (the bias circuit on switch). And of course pictures are worth a thousand words. I’ve been way too busy with the T41, some health issues, gathering a 30 foot dish before its gets tossed out, and family to help. Dr. William J. Schmidt - K9HZ J62K(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@... From: [email protected] <[email protected]> On Behalf Of Michael Bales via groups.io Sent: Saturday, April 26, 2025 2:46 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] Pill Bottles I will take a couple dozen. Next week I have an order to put in for another 20w pa and a 100w kit too. You can send with them. FYI, I just worked South Africa on ft8 with your amp. Granted, after the lpf and tuner, I was only putting out 6.6w, but damn impressive! -------- Original message -------- From: K9HZ <bill@...> Date: 4/26/25 2:28 PM (GMT-05:00) To: [email protected] Cc: tdxs-list@... Subject: [AmateurRadioBuilders] Pill Bottles For anyone that wants them… FREE… I have hundreds of pill bottles.. several different sizes. Good for screws and washers, organizing parts, etc. They are yours for the taking. Dr. William J. Schmidt - K9HZ J62K(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@... -- Mike - K8MCB