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Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I am a little unclear as to exactly what you are trying to do, but normally you want you antenna to be the same height as the secondary. What wire is is wrapped arround?
However, I would very highly recommend using a current transformer instead of an antenna, because they are much more compact and usually more reliable.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
... wrote ...
However, I would very highly recommend using a current transformer instead of an antenna, because they are much more compact and usually more reliable.
Sorry but i have to disagree here. In my experience the antenna catches reliable feedback with just very few volts on the bridge! And the feedback seems to be more stable, with CT the arcs sometimes sound funny as you move objects around the coil, and CT usually cannot stand ground arcs and it blows the bridge.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068
You can't have a class-e topology with feedback unless your range of frequency is extremely minimal. Proper class-e topology requires a precise frequency for operation and it must be tuned that frequency.
If someone has a feedback driven class-e circuit, then its really not class-e or not working properly as a class-e.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Dr. Shock wrote ...
You can't have a class-e topology with feedback unless your range of frequency is extremely minimal. Proper class-e topology requires a precise frequency for operation and it must be tuned that frequency.
If someone has a feedback driven class-e circuit, then its really not class-e or not working properly as a class-e.
Then what do you suggest i use? If not feedback the what? Like a tl494 or 555 or uc3842(im not too familiar with that one so i dont know about that one.).
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
you need to tune your resonator to the exact output frequency. if you want a true class-e design, then you want to look at Richie Burnett's class-e schematic.
other designs i've seen which claim to be class-e, really aren't. not to say they all aren't, but the ones i've seen aren't class-e.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Ken M. wrote ...
So Steve Wards isn't class E?
Steve's circuit is only designed for the one resonator frequency. Thats what i'm getting at. You can't take the driver from the one coil and simply connect it to another thinking the antenna is simply going to make the thing work at a different frequency. He designs the entire output stage to match the frequency of the resonator, but just uses the antenna to drive that.
So, yes, his is a Class-E. But it is fixed frequency meaning if it was designed for say 4.54MHz, its not going to run properly at 4.6MHz.
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Class E sstc antenna?
