Frame for a spiral resonator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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When experimenting with spiral resonators, there was a problem with the frames for their execution. The implementation of frameless resonators is difficult, because there are problems with ensuring their rigidity. Glass vials turned out to be the best material for them, but they also turned out to be the most inconvenient material for their construction. Firstly, it is difficult to fix the resonator turns rigidly on the glass, and secondly, their dimensions do not always satisfy the necessary ones. The implementation of the frame of plastic is structurally more preferable.
However, in most cases its permittivity and losses are unknown. The suitability of such plastic for the frame is determined very easily. To do this, pieces of the material of the resonator frame are placed in the coil of the P-circuit of an amplifier with a power of 100 - 200 W. "Warming up" these pieces with a frequency of 28 MHz for 5 - 10 minutes (depending on their size), you can determine the suitability of the material by touch. Warm, and especially hot pieces of material are unsuitable.
If you do not have a RA or its power is low, you can successfully use an ordinary household microwave oven. After heating for 10 - 15 minutes (together with another, more natural load for the furnace), it is possible to determine even more accurately than when using heating in the transmitter, whether or not the frames are suitable for use in spiral resonators. I draw your attention to the fact that many ceramic, plastic and fluoroplastic frames did not pass this test.
Author: I. Grigorov (RK3ZK), Belgorod; Publication: N. Bolshakov, rf.atnn.ru
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