¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
Re: FW: [Elecraft] HI CUR warning on K3
I got lost in other things and forgot to respond to this. If you have room to put up a 270 foot wire antenna¡­ surely you can put up something much more substantial than a 270 foot non-resonant piece
By K9HZ · #2650 ·
Re: 20w rf amp - need help
Great Bruce! Just let me (or anyone here) know if you need any help. Most of us live for this stuff¡­ Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner -
By K9HZ · #2649 ·
Re: 20w rf amp - need help
It is going well. By my counting I get 10 1/2 loops before I run out of room in the center. I have not quite finished for 2 reasons, 1. I read your notes, recently got a teensy and display and have
By Bruce VA3BKI · #2648 ·
Re: Tuner interests
Yep. We are saying the exact same thing. I can build that programming into an Arduino. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal
By K9HZ · #2647 ·
Re: Tuner interests
Oh yeah¡­ I¡¯ve seen this move MANY times before. They put out a patent that they know full well contains public/ common knowledge technology and then use It as a way to blackmail companies into
By K9HZ · #2646 ·
Re: Tuner interests
I have the original first edition of the book published in 1987. I guess that makes me an OM now. FYI, Palstar got a couple of patents on this concept in 2019-2020 (you can patent a ham sandwich) and
Re: Tuner interests
*** I have an MFJ998RT kilowatt remote autotuner at the base of my vertical. It mostly works well, and magically produces low SWR across most of the HF bands. Which is important, because I have a
By jerry-KF6VB · #2644 ·
Re: Tuner interests
Yep familiar with this. It¡¯s almost exactly what I was talking about¡­ just solving the equations to generate a transform that gives a pure resistive load. The AD8302 is a sweet device to use to
By K9HZ · #2643 ·
Re: Tuner interests
Here's a typical example I was attempting to describe: Consider that the Z at the input end of a 50 ft section of Zo=600 ohm line is 227+j521.? Assume that's the measured S11 value from a single-port
By Paul Christensen · #2642 ·
Re: Tuner interests
second edition for $53 https://www.amazon.com/Single-sideband-systems-circuits-William-Sabin/dp/0070544077/ref=monarch_sidesheet
By Lou, KI5FTY · #2641 ·
Re: Tuner interests
Amazon has it for $70.42 https://www.amazon.com/Single-Sideband-Systems-Circuits-William/dp/0079120385
By Lou, KI5FTY · #2640 ·
Re: 20w rf amp - need help
How is this build going? 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
By K9HZ · #2639 ·
Re: Tuner interests
Hi Bill, are you familiar with this QEX article? After I read it, I found a ton of information about using mixers as phase detectors:
By Karl Heinz Kremer · #2638 ·
Re: Tuner interests
There are five used copies at Abe's Book going for $75 to $120 https://www.abebooks.com
By Todd Cottle · #2637 ·
Re: Tuner interests
It is available on the internet archive: https://archive.org/details/singlesidebandsy0000unse
By Lou, KI5FTY · #2636 ·
Re: Tuner interests
Ge Bill and the Group This tuner concept sounds very interesting. You guys have my attention. Keep up the good design work Bill. 72 Johnny AC0BQ -- 72 JOHNNY AC0BQ .. 4sqrp Group
By Johnny AC0BQ · #2635 ·
Re: Tuner interests
By the way¡­ this is my second book. One of my (so called) friends stole my original copy! Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big
By K9HZ · #2634 ·
Re: Tuner interests
Its ¡°Single Sideband Systems and Circuits¡±. You are gonna think I¡¯m nuts, but I keep it in my safe because its so valuable to me. Look at the names that wrote the sections. Guys like Bruene,
By K9HZ · #2633 ·
Re: Tuner interests
What is the title of Sabins book that you referenced. Dick K9IVB
By dick faust · #2632 ·
FW: Stuff
Here was out dialogue¡­ 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
By K9HZ · #2631 ·