Hi Fez.. i hope you had a good Christmas and wish you a good New Year... Im always happy to se a new video from you.. but on the other hand then I knowI still have a backlog og your Videos i still haven't had time to sit down and enjoy/digest...
An interesting question is: at what frequency does the transformer cross over from transmission line mode to a more conventional mode where the line impedance is not a determining factor of performance.
I remember reading somewhere that this point is around when the line length is 1/10 to 1/12th of the signal wavelength. So when its shorter than this, it will work in the "conventional" mode and above you start seeing the transmission line mode
You would have the two (or more) magnetic fields interacting with each other if all lines are using a single magnetic core. This would not produce the same results as using different magnetic cores. The multiple magnetic cores keep respective multiple magnetic fields separated from each other.
I think this is the first time of hear of this circuit; maybe you can give me some details on what you would like to use it for and when it is needed; also what sort of simulation issue did you run into?
Nice video and very informative. But have you tried an LTspice simulation of 1:4 transformer with transmission lines, to see the low frequency dropoff ? It must be depending on lengths of the lines...
In the previous episode of this series - the one on Ruthroff transformers, I do show a method to simulate impedance transformers using transmission lines in which you can also see the low frequency drop off.
Do a search for the "Kellermann Balun". It might be of interest to you and others, possibly try to simulate it and figure out how it works, the theory behind it. I contacted a few people on the subject, not much was given out. I'm a retired RF engineer, and also a Radio Amateur for 50 years. If I get the time I will also build one to test. Mind you that it is a 1:1 Balun. From what I can understand, it will handle plenty of power, depending on the size of the coax used, eg: rg142 or rg393. Should be a perfect Balun for a Balanced Tuner, on the input side of course, 50 ohms unbalanced in , output balanced.
Thanks for discussing this. You are forgiven for your pronunciation of balun since English is not your first language. (Balanced to unbalanced) Baal-un. Not Bail-un. Not bay-lun.
A very balanced presentation that did not impede, but rather transformed my understanding of the subject. 🙂
Congrats! Yet another very good video. Applause!
Hi Fez.. i hope you had a good Christmas and wish you a good New Year...
Im always happy to se a new video from you.. but on the other hand then I knowI still have a backlog og your Videos i still haven't had time to sit down and enjoy/digest...
Thanks fesz, u are the one who deepen my interest in ltspice.
Happy New Year, FesZ.
Happy New Year!
where to find one 😅 had one blown to bits on a pcb. tiny thing
Thanks, FesZ 👍
Happy New year 🎉💐💥
An interesting question is: at what frequency does the transformer cross over from transmission line mode to a more conventional mode where the line impedance is not a determining factor of performance.
I remember reading somewhere that this point is around when the line length is 1/10 to 1/12th of the signal wavelength. So when its shorter than this, it will work in the "conventional" mode and above you start seeing the transmission line mode
Hope you making money from all this videos, very useful they are
What would be the disadvantage of using the same magnetic core for all lines on the Guanella transformer?
You would have the two (or more) magnetic fields interacting with each other if all lines are using a single magnetic core. This would not produce the same results as using different magnetic cores. The multiple magnetic cores keep respective multiple magnetic fields separated from each other.
Hi FesZ, wondering if you can analyze the DC Blocker circuit. I tried simulate the circuit with LTspice but I got rather strange result.
I think this is the first time of hear of this circuit; maybe you can give me some details on what you would like to use it for and when it is needed; also what sort of simulation issue did you run into?
Nice video and very informative. But have you tried an LTspice simulation of 1:4 transformer with transmission lines, to see the low frequency dropoff ? It must be depending on lengths of the lines...
In the previous episode of this series - the one on Ruthroff transformers, I do show a method to simulate impedance transformers using transmission lines in which you can also see the low frequency drop off.
Do a search for the "Kellermann Balun". It might be of interest to you and others, possibly try to simulate it and figure out how it works, the theory behind it. I contacted a few people on the subject, not much was given out. I'm a retired RF engineer, and also a Radio Amateur for 50 years. If I get the time I will also build one to test. Mind you that it is a 1:1 Balun. From what I can understand, it will handle plenty of power, depending on the size of the coax used, eg: rg142 or rg393. Should be a perfect Balun for a Balanced Tuner, on the input side of course, 50 ohms unbalanced in , output balanced.
😃😄😁😆😅 5 Smile's.
Thanks for discussing this. You are forgiven for your pronunciation of balun since English is not your first language. (Balanced to unbalanced) Baal-un. Not Bail-un. Not bay-lun.