A couple of things about the two-step tuner... The innovation in the Palstar patents appears to be the use of a transformer (unun) on the transmitter side, so matches are made to 450 ohms. The patents claim this allows the use of just one L-network topology for all antenna impedances. Another, reversible transformer on the antenna side broadens the impedance range of the tuner.
The AD8302 looks like a very useful IC, and a good alternative to phase detector designs like the mixers in the NanoVNA. The only drawback is, it costs $22 in quantity one.
73,
Wes AC8JF
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Re: FW: [Elecraft] HI CUR warning on K3
It is the best we could do, and it has worked magnificently for us through three or four years of local, state-wide, and federal participation. ?It has also been excellent in our field day efforts. ??
It¡¯s difficult to explain how much work it takes to move anything through a heavily forested area with branches everywhere. ? The underbrush makes even walking difficult. ?Furthermore the chiggers ate us up the first time.
However the discussion was about common mode current and notably, we just haven¡¯t had any problem with that. I believe the use of the Guanella Balun ?which notably reduces common mode current, plus a one to one current choke has basically eliminated the problem.
We are very familiar with the issues of common mode current from end-fed half wave antenna¡®s but we have also use those successfully many times, by using precautions.
The commonly sold Windom type of OCFD antennas use a voltage Balun ?which does not reduce common ?mode current and we have stayed ?away from those. ?
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On Nov 9, 2023, at 22:58, K9HZ <bill@...> wrote:
? Well¡ yes.? ? I have a slew of tools that I usually use on antennas before I comment particularly when I do it for contract work.? I have not done that here so I guess I have no further comment other than if it works for you.? Great. ? ? 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@... ? ? ? Hi, Bill, something got lost in the translation.
- The antenna is not nonresonant
- The antenna is not end fed
- The issue being discussed was I thought off-center fed dipoles & common mode current
- The reason the antenna is relevant is that it is a 160 m off center fed dipole (OCF) & therefore works on a slew of bands above that ; The point being that we have experienced no difficulties with common mode current with our extensive digital operations
what you might not know is that this goes through an extremely densely treed forest and it took hours and hours and hours of work nearly to get a single straight section of wire through. Many many slingshot efforts in dense ?underbrush. ?Trying to put up a loop or any other more complicated antenna is unreasonably difficult in that physical setting , and with increase the chance of us losing the antenna in a hurricane, the very system for which we are trying to provide back up communications. This was the best we could do because the radiated nearfield noise from electrical equipment within the building was 30 or more dB stronger so we had to move to the woods. ?
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Re: FW: [Elecraft] HI CUR warning on K3
Well¡ yes.? ? I have a slew of tools that I usually use on antennas before I comment particularly when I do it for contract work.? I have not done that here so I guess I have no further comment other than if it works for you.? Great. ? ? 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@... ? ?
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From: [email protected] < [email protected]> On Behalf Of Gordon Gibby Sent: Thursday, November 9, 2023 9:25 PM To: [email protected]Subject: Re: [AmateurRadioBuilders] FW: [Elecraft] HI CUR warning on K3 ? Hi, Bill, something got lost in the translation.
- The antenna is not nonresonant
- The antenna is not end fed
- The issue being discussed was I thought off-center fed dipoles & common mode current
- The reason the antenna is relevant is that it is a 160 m off center fed dipole (OCF) & therefore works on a slew of bands above that ; The point being that we have experienced no difficulties with common mode current with our extensive digital operations
what you might not know is that this goes through an extremely densely treed forest and it took hours and hours and hours of work nearly to get a single straight section of wire through. Many many slingshot efforts in dense ?underbrush. ?Trying to put up a loop or any other more complicated antenna is unreasonably difficult in that physical setting , and with increase the chance of us losing the antenna in a hurricane, the very system for which we are trying to provide back up communications. This was the best we could do because the radiated nearfield noise from electrical equipment within the building was 30 or more dB stronger so we had to move to the woods. ?
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Re: FW: [Elecraft] HI CUR warning on K3
Hi, Bill, something got lost in the translation.
- The antenna is not nonresonant
- The antenna is not end fed
- The issue being discussed was I thought off-center fed dipoles & common mode current
- The reason the antenna is relevant is that it is a 160 m off center fed dipole (OCF) & therefore works on a slew of bands above that ; The point being that we have experienced no difficulties with common mode current with our extensive digital operations
what you might not know is that this goes through an extremely densely treed forest and it took hours and hours and hours of work nearly to get a single straight section of wire through. Many many slingshot efforts in dense ?underbrush. ?Trying to put up a loop or any other more complicated antenna is unreasonably difficult in that physical setting , and with increase the chance of us losing the antenna in a hurricane, the very system for which we are trying to provide back up communications. This was the best we could do because the radiated nearfield noise from electrical equipment within the building was 30 or more dB stronger so we had to move to the woods. ?
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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 of wire. ?With that space, ?I would have encouraged you to put up wire beams, delta loops, phased sloping dipoles, etc. that would contain essentially cost the same and take the same real estate, but greatly outperform an end-fed wire (as could be confirmed by true field strength tests).? ?Even a good fan dipole with out perform an end-fed wire every time.? The only time I recommend it is if you have no other choice. ? The objective for any antenna is to couple as much RF energy to the atmosphere (E+H) as possible.? Resonant antennas do that better than non-resonant antennas.? Transformers are not 100% efficient, but are better than impedance mis-matches.? Baluns and chokes are good for keeping RF off the feedlines and transforming it to the antenna so that is done correctly.? It demands a good ground or counter poise at the antenna feed point in order to work properly.? EFWAs are lowest impedance at the radio connection and therefore the maximum RF current (which creates most of the electromagnetic radiation) is generated there instead of at the antenna where you want it.? Unfortunately that counter-acts the fact that he UNUN (choke) should be as far away from the transmitter as possible to keep the radiating element is away from the radio and less likely to cause EMC problems.? However the coax is really part of the antenna, so that UNUN should be as close to the radio as you can get it too. ? Too much work for too little gain. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operatort 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@... ? ?
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From: [email protected] < [email protected]> On Behalf Of Gordon Gibby Sent: Wednesday, November 8, 2023 2:49 PM To: [email protected]Subject: Re: [AmateurRadioBuilders] FW: [Elecraft] HI CUR warning on K3 ? Well I bet you guys have more experience than we do, but Alachua County ARES(R) has been using a 270-foot off center fed dipole on multiple bands for several years with up to 600 watts.? ? We also use them on summer Field Day.? ? ? In order to reduce common?mode currents, we do these things: a)? use a CURRENT BALUN instead of a voltage balun.? ? ?We build our own 4:1 Guannella?type current baluns. b)? Add a 1:1 current choke type balun near the transmitter.? ? We hand construct THOSE also. (Yes, I know, these are more properly called UN-UNs, but we all know what we re talking about).?? Using these techniques we are very?successful with both voice and digital techniques for several years.? ? ? On Wed, Nov 8, 2023 at 2:59?PM K9HZ <bill@...> wrote: I could not have put this better but was afraid to say it because sooooo
many people have these silly antennas.
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@...
-----Original Message-----
From: elecraft-bounces@... <elecraft-bounces@...> On
Behalf Of Jim Brown
Sent: Wednesday, November 8, 2023 1:55 PM
To: elecraft@...
Subject: Re: [Elecraft] HI CUR warning on K3
On 11/8/2023 8:21 AM, Pete Smith N4ZR wrote: I've fairly well established that the problem is not at the antenna,
but arising somewhere in the grounding/RFI protection in my station,
since it occurs only on one band and (more importantly) because it
stopped totally after I re-tightened all the connections in my
grounding system yesterday
That can certainly be a major cause of problems with RF in the shack.
The Carolina Windom incorporates a line isolator 22 feet down from the
feedpoint, but technical questions have been raised about exactly what
you describe, and I'm not technical enough either to question the
analysis or to experimentally measure the common mode current on the
feedline.
ALL off-center-fed antennas are a train wreck for RF in the shack, and for
blowing "line isolators" and chokes. This is because their strong imbalance
puts huge common mode current on the feedline. They are a very bad idea,
especially if running high power. Anything done to try to "fix" them is
putting lipstick on a pig.
73, Jim K9YC
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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 - 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@... ? ?
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From: [email protected] < [email protected]> On Behalf Of Bruce VA3BKI Sent: Thursday, November 9, 2023 6:44 PM To: [email protected]Subject: Re: [AmateurRadioBuilders] 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 been trying to understand how to make that work. I have some of the software pieces set but haven't got all the referenced libraries down loaded yet.
2. To test your unit I need more test equipment. With xmas coming budget is a bit strained and I need to wait to buy some of the equipment. In particular a TinySA Ultra which acts as a signal generator. I have a lot to learn so I am taking step by step.
I appreciate all the assistance that you have offered.
I am also waiting for v012 boards to be published. I need them and a few of the others.
I am certainly as knowledgeable as most of the others in this group but I enjoy the learning and building aspect the most.
73, Bruce
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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 been trying to understand how to make that work. I have some of the software pieces set but haven't got all the referenced libraries down loaded yet.
2. To test your unit I need more test equipment. With xmas coming budget is a bit strained and I need to wait to buy some of the equipment. In particular a TinySA Ultra which acts as a signal generator. I have a lot to learn so I am taking step by step.
I appreciate all the assistance that you have offered.
I am also waiting for v012 boards to be published. I need them and a few of the others.
I am certainly as knowledgeable as most of the others in this group but I enjoy the learning and building aspect the most.
73, Bruce
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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 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@... ? ?
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From: [email protected] < [email protected]> On Behalf Of Paul Christensen Sent: Wednesday, November 8, 2023 10:10 PM To: [email protected]Subject: Re: [AmateurRadioBuilders] 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 antenna analyzer module.? Transmission line software like TLW can mathematically find precise component values that convert the complex Z into 50+j0.? In this case, I selected a high-pass L network option.? The resulting component values are 43 pF series C and 5.36 uH shunt L at the line side.? No fuzzy logic needed to ignorantly step relays until a VSWR value under 1.5:1 is achieved.? By joining an S11 analyzer with the transmission line software into one unit: (1) the mag + phase is measured; (2) component values are computed; and (3) the analyzer module switches L and C components to those values in one switching event, perhaps through an I2C interface.? ?Images below.
Paul, W9AC
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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 settling out of court as a cheesy way to make money.?? It¡¯s a despicable way to operate, yet some companies live this way.? I guess that¡¯s all Palstar has to offer these days. ? My youngest son is a big-name intellectual property lawyer¡ he would have these patents vacated in 30 seconds. ? ? 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@... ? ?
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From: [email protected] < [email protected]> On Behalf Of Scott Dupuie Sent: Thursday, November 9, 2023 9:03 AM To: [email protected]Subject: Re: [AmateurRadioBuilders] 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 was shopping it around to companies that manufacturer tuners.
Maybe their intent was to license the technology, but I suspect it was to set up a future patent infringement suit should someone independently develop a tuner using this approach and sell it. The clue was that the only representative from Palstar in the room was their lawyer. There is a big difference in patent litigation between accidentally and knowingly violating a patent. When their lawyer made the rounds, he was likely looking to eliminate any chance that a company could argue they were unaware of the patent. Ham radio companies are not generally run by savvy business people and the people in the room I was in did not understand his intent.
The concept has obviously been around for a while and is a solution that anyone skilled in the art could come up with. I don't bring this up as an issue anyone developing one for hobby use should be concerned about. Just an interesting anecdote on the subject.
73,
Scott
AK5SD
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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 was shopping it around to companies that manufacturer tuners.
Maybe their intent was to license the technology, but I suspect it was to set up a future patent infringement suit should someone independently develop a tuner using this approach and sell it. The clue was that the only representative from Palstar in the room was their lawyer. There is a big difference in patent litigation between accidentally and knowingly violating a patent. When their lawyer made the rounds, he was likely looking to eliminate any chance that a company could argue they were unaware of the patent. Ham radio companies are not generally run by savvy business people and the people in the room I was in did not understand his intent.
The concept has obviously been around for a while and is a solution that anyone skilled in the art could come up with. I don't bring this up as an issue anyone developing one for hobby use should be concerned about. Just an interesting anecdote on the subject.
73,
Scott
AK5SD
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On 2023-11-08 16:42, K9HZ wrote: Most of the commercial antenna tuners for hams (MFJ, Elecraft, LDG,
etc.) are built with fixed components (fixed caps and coils) *** 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 250-foot coax run. It is not, however without annoyances. MFJ basically took their desktop autotuner and packaged it in a weatherproof case. There is no remote control - all I can do from the shack is to interrupt power to it. It has memories; once it has completed a tuning sequence for a frequency, it remembers it and returns to it instantly. But if things change up at the antenna - maybe a connection got a little corroded, or a bush grew up, or ??? , the tuner does not retune. It keeps using the memories, and the SWR at the shack degrades. The only way I can make it retune is to trek up the hill, remove the umpteen screws for the weatherproof cover, and push a sequence of buttons to get a factory default. Thankfully that isn't necessary very often. - Jerry, KF6VB
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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 get phase and mag info.? The thing about the article is that he only uses one-of-four possible arrangements of the L and C? (series L on input, shunt C to ground) which gives the largest transform space (270 degrees) but not situations where the antenna is inductive and when its less than 50 ohms real.? That¡¯s when you need the ability to swap the inductor and capacitor (series C input, shunt L to ground) and (Series C output, shunt L to ground) to cover those cases when the antenna is inductive or and/pr less than 50 ohms real.? Of course that means two more sets of equations to solve too basis what structure is selected.? The initial phase and magnitude is used to select the right structure and then solved just like in the paper. ? ? 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@... ? ?
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From: [email protected] < [email protected]> On Behalf Of Karl Heinz Kremer Sent: Wednesday, November 8, 2023 9:20 PM To: [email protected]Subject: Re: [AmateurRadioBuilders] 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:
de Karl Heinz - K5KHK
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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 antenna analyzer module.? Transmission line software like TLW can mathematically find precise component values that convert the complex Z into 50+j0.? In this case, I selected a high-pass L network option.? The resulting component values are 43 pF series C and 5.36 uH shunt L at the line side.? No fuzzy logic needed to ignorantly step relays until a VSWR value under 1.5:1 is achieved.? By joining an S11 analyzer with the transmission line software into one unit: (1) the mag + phase is measured; (2) component values are computed; and (3) the analyzer module switches L and C components to those values in one switching event, perhaps through an I2C interface.? ?Images below. Paul, W9AC 
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On Wed, Nov 8, 2023 at 9:55?PM Lou Scalpati < lscalpati@...> wrote:
On Wed, Nov 8, 2023 at 9:32?PM Todd Cottle < tjcottle@...> wrote: There are five used copies at Abe's Book going for $75 to $120
On Wed, Nov 8, 2023 at 7:58?PM K9HZ < bill@...> wrote: 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 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@... ? ? ? 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, Blocksome, Snider, Church, Sabin, Groshong, etc¡ all giants in their respective fields.? All written at Collins by the engineering staff back when they were leading the pack.? Was published in 1995 and still as relevant today as when it was written.? The last two photos show tuner operating space (Re+Im) for different arrangements of the inductor and capacitor (series and to ground), and the last photo shows a way to ¡°Autotune¡± any transmitter¡ as a perfectly tuned PA (amplifier) is purely resistive and 180 degrees out of phase with the input. ?  ????  ?????
 ??????
? ? ? 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@... ? ? ? What is the title of Sabins book that you referenced.
Dick K9IVB
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On Wed, Nov 8, 2023 at 9:32?PM Todd Cottle < tjcottle@...> wrote: There are five used copies at Abe's Book going for $75 to $120
On Wed, Nov 8, 2023 at 7:58?PM K9HZ < bill@...> wrote: 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 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@... ? ? ? 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, Blocksome, Snider, Church, Sabin, Groshong, etc¡ all giants in their respective fields.? All written at Collins by the engineering staff back when they were leading the pack.? Was published in 1995 and still as relevant today as when it was written.? The last two photos show tuner operating space (Re+Im) for different arrangements of the inductor and capacitor (series and to ground), and the last photo shows a way to ¡°Autotune¡± any transmitter¡ as a perfectly tuned PA (amplifier) is purely resistive and 180 degrees out of phase with the input. ?  ????  ?????
 ??????
? ? ? 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@... ? ? ? What is the title of Sabins book that you referenced.
Dick K9IVB
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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 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@... ? ?
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From: [email protected] < [email protected]> On Behalf Of Bruce VA3BKI Sent: Sunday, October 1, 2023 12:07 PM To: [email protected]Subject: Re: [AmateurRadioBuilders] 20w rf amp - need help ? Bill:
I am responding this way as I can't read your email address. The ending is blocked and I don't know how to get around that. ? I became a ham in Dec 2021. Passed Basic with Honours. So I am very new. ? I can¡¯t send a picture since I tried 3 times to do the winding so it would look like your picture. The last time taking it apart I didn¡¯t pay enough attention and lost the FT50-43 toroid. ? I always seemed to be short about a half inch. I used vice to hold toroid, alligator to hold first end and pulled hard- no luck ¨C and wire piece measures 6 inches. ? Comments and questions: - Can I use any 20 gauge coated wire or is special wire required?
- I can buy toroid from kits and parts. I requested a quote on 3 ft of the wire from NNC if they will sell me such a small amount. Siill waiting their quote.
- Can I buy replacement parts from you? Both parts of L2 2ft wire and toroid.. I am in Canada and how would I pay you?
? Thank you for responding to me. ? ?My email is Kuppersbruce@... 73, ? Bruce Kuppers VA3BKI
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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:
de Karl Heinz - K5KHK
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There are five used copies at Abe's Book going for $75 to $120
On Wed, Nov 8, 2023 at 7:58?PM K9HZ < bill@...> wrote: 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 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@... ? ? ? 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, Blocksome, Snider, Church, Sabin, Groshong, etc¡ all giants in their respective fields.? All written at Collins by the engineering staff back when they were leading the pack.? Was published in 1995 and still as relevant today as when it was written.? The last two photos show tuner operating space (Re+Im) for different arrangements of the inductor and capacitor (series and to ground), and the last photo shows a way to ¡°Autotune¡± any transmitter¡ as a perfectly tuned PA (amplifier) is purely resistive and 180 degrees out of phase with the input. ?  ????  ?????
 ??????
? ? ? 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@... ? ? ? What is the title of Sabins book that you referenced.
Dick K9IVB
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It is available on the internet archive:
On Wed, Nov 8, 2023 at 8:54?PM K9HZ < bill@...> wrote: 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, Blocksome, Snider, Church, Sabin, Groshong, etc¡ all giants in their respective fields.? All written at Collins by the engineering staff back when they were leading the pack.? Was published in 1995 and still as relevant today as when it was written.? The last two photos show tuner operating space (Re+Im) for different arrangements of the inductor and capacitor (series and to ground), and the last photo shows a way to ¡°Autotune¡± any transmitter¡ as a perfectly tuned PA (amplifier) is purely resistive and 180 degrees out of phase with the input. ?  ????  ?????
 ??????
? ? ? 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@... ? ? ? What is the title of Sabins book that you referenced.
Dick K9IVB
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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
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K9HZ
Scott Dupuie
Paul Christensen
Johnny AC0BQ