couple magnetron output into direct load
couple magnetron output into direct load
(OP)
hello fellows, is it possible to properly connect the output of the magnetron into a conducting wire??.
what i did so far.
1. the antenae off the anode block appears to be 2,25 inches long. surprising not 1/4 wavelength, that was new to me. however, i believe it oscillates with respect to ground or metal shell of magnetron. i soldered a wire to the antenae without destroying vacuum tube, i then soldered other end of wire to shell of magnetron. the wire lentgh was exactly 10 times length of the antenae length(i was trying to approuch some kind of imppedence matching criteria).
2. i dont expect the 2.45 ghz as i now introduce an inductance/short/opon across the magntron, but i am hoping for some kind of high frequency device for power extraction.
3. if this is then possible?? i will then place an electromagnet on the back of the maggie and vary the applied magnetic field to see if the frequency is slightly adjustable.
4. not too many really good books on the finer details of magnetron i have found--can someone recommend the maggie bible.
thank you kindly
sam
what i did so far.
1. the antenae off the anode block appears to be 2,25 inches long. surprising not 1/4 wavelength, that was new to me. however, i believe it oscillates with respect to ground or metal shell of magnetron. i soldered a wire to the antenae without destroying vacuum tube, i then soldered other end of wire to shell of magnetron. the wire lentgh was exactly 10 times length of the antenae length(i was trying to approuch some kind of imppedence matching criteria).
2. i dont expect the 2.45 ghz as i now introduce an inductance/short/opon across the magntron, but i am hoping for some kind of high frequency device for power extraction.
3. if this is then possible?? i will then place an electromagnet on the back of the maggie and vary the applied magnetic field to see if the frequency is slightly adjustable.
4. not too many really good books on the finer details of magnetron i have found--can someone recommend the maggie bible.
thank you kindly
sam





RE: couple magnetron output into direct load
The length of the wires you are attaching should not be used to define an impedance. You need a load! The launcher is a matching device to the waveguide and then to the cavity. It will only be matched when loaded.
You should be using a coaxial output from the magnetron, not a pair of wires. The ratio of internal to external diameters will give you the impedance from standard formulae. You must first read the safety warnings presented on the other threads however. Then you need a load to terminate the magnetron.
RE: couple magnetron output into direct load
The bible for magnetrons is by Collins in the MIT RadLab series. If you are a student, you can get the whole series on CD for a reasonable price. There is another two-volume book that is good, but I can't remember the author's name right now. I will post it later when I remember.
What do you want to do with the power you extract?
RE: couple magnetron output into direct load
sam
RE: couple magnetron output into direct load
I would say the magnetron frequency cannot be "pulled" significantly. It will stay where it started plus or minus a few percent (guesswork).
You output wire is not dissipative and is therefore not a load. It will act as a matching transformer but a tesla coil at 2.45GHz is somewhat doubtful. If your tesla coil is resonant at 100MHz it will not couple much at all.
This whole project sounds like something between suicide and homicide.
RE: couple magnetron output into direct load
thank you
RE: couple magnetron output into direct load
Self immolation for beginners.
RE: couple magnetron output into direct load
Not many people use two wire transmission at that high frequency. Hence, your power at the load will be less than what you expect. Keep your wires from varying in separation distance from themselves. You may want to change the wires to a finline transmission using FR4. Finline is like having a circuit board with copper on one side only, then etching a slot out of the center. Result is two identical halves of copper clad board. Impedance is usually 100+ ohms but varies with the gap spacing you've etched.
KCH
RE: couple magnetron output into direct load
accelerated by 1 V.
For 1 mV you don't need a magnetron -- I would check gunn-diode or similar device.
----------------------------
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RE: couple magnetron output into direct load
start by budgeting the research instutute about the size
of the Manhattan-project...
----------------------------
Please read FAQ240-1032
My WEB: <http://geocities.com/nbucska/>