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July 7th 03, 10:14 PM
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-=jd=- wrote: On 07 Jul 2003, N8KDV wrote: -=jd=- wrote: On 07 Jul 2003, N8KDV wrote: ...snipped... -=jd=- wrote: Well, the confusion I have arises when I see insulated wire wound around a core... Well, it had better be insulated to some extent... I'll take another look at the info you pointed me to. jd So far, looking over the .pdf on xformer construction, and looking at other sources, it seems to be the magnetism that is the key. In the .pdf (Fabricating Impedance Transformers for Receiving Antennas by John Bryant - May 2001)advises in it's last sentence: "May the forces (magnetic) be with you!" As to the insulation, one use (not the only use) for it is to maintain the spacing of the wires. One source stressed that a couple times. In general, the info tends to indicate that the winding's magnetic field interacts with the core's magnetic field in some manner to acheive the desired result. I can't find any mention as to the composition of the core having more of an effect... I'm continuing to look, though. If anything, you've peaked my curiosity about it enough to occupy my evenings for a bit. JD If you read the article carefully you may discern that the cores composition is indeed critical. It's indeed right there in front of your eyes. As I stated at the start of this discourse, I knew that there may indeed be some argument or perhaps reluctance. Been through it before... Meanwhile... I'll be enjoying the weak signal DX. I wish you the best of luck. I just give up! I'll leave the rest of you to your own devices, schemes, etc. I appreciate your voluntary replies. I apologize if, in some way, you felt obligated to "teach". I can assure you that was not my intent. I was just seeking opinions. I understand, I just give up. jd |
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