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#1
December 3rd 07, 08:56 PM
posted to rec.radio.amateur.antenna
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ferrite antenna design...plz help
hi...
i am currently doin a project and am stuck at making a ferrite core antenna with tuning circuit to detect a 457 khz RF wave.can aneone help me in this regard... regards vedaprakash |
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#2
December 4th 07, 04:14 AM
posted to rec.radio.amateur.antenna
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ferrite antenna design...plz help
wrote in message ... hi... i am currently doin a project and am stuck at making a ferrite core antenna with tuning circuit to detect a 457 khz RF wave.can aneone help me in this regard... regards vedaprakash I would use one out of an old AM broadcast radio. You just have to increase the C a little. Tam |
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#3
December 4th 07, 04:40 AM
posted to rec.radio.amateur.antenna
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ferrite antenna design...plz help
Tam/WB2TT wrote:
... I would use one out of an old AM broadcast radio. You just have to increase the C a little. Tam Actually, a good idea, heck, tear apart two old am radios, use the cores side-by-side, cut down on the turns and allow you to go lower .... JS |
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#4
December 5th 07, 07:08 PM
posted to rec.radio.amateur.antenna
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ferrite antenna design...plz help
Christopher Cox wrote:
Actually, a good idea, heck, tear apart two old am radios, use the cores side-by-side, cut down on the turns and allow you to go lower .... JS er, you mean add. No, I meant what I said and said what I meant ... Two cores will not require as many turns as one ... cut down on the turns one core would require. Regards, JS |
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#5
December 5th 07, 08:03 PM
posted to rec.radio.amateur.antenna
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ferrite antenna design...plz help
"John Smith" wrote in message ... Christopher Cox wrote: Actually, a good idea, heck, tear apart two old am radios, use the cores side-by-side, cut down on the turns and allow you to go lower .... JS er, you mean add. No, I meant what I said and said what I meant ... Two cores will not require as many turns as one ... cut down on the turns one core would require. Regards, JS Why bother doing this? The AM coil will tune to within 10% of the frequency as is with about 400 PF. Add another 100 PF or so. Tam |
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#6
December 5th 07, 08:32 PM
posted to rec.radio.amateur.antenna
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ferrite antenna design...plz help
Tam/WB2TT wrote:
Why bother doing this? The AM coil will tune to within 10% of the frequency as is with about 400 PF. Add another 100 PF or so. Tam Because less conductor results in less conductor resistance and results in a higher Q. Regards, JS |
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#7
December 5th 07, 08:45 PM
posted to rec.radio.amateur.antenna
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ferrite antenna design...plz help
Tam/WB2TT wrote:
Why bother doing this? The AM coil will tune to within 10% of the frequency as is with about 400 PF. Add another 100 PF or so. Tam Well, there is also the "thing" about keeping the tuned circuit in the range of presented impedance you wish ... Regards, JS |
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#8
December 6th 07, 04:54 PM
posted to rec.radio.amateur.antenna
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ferrite antenna design...plz help
Christopher Cox wrote:
... er...whoops. Somehow I missed the using TWO cores wired together in series. Chris I have seen the lowfers use cores placed end to end, (sometimes superglued and placed in a plastic tube), however, two cores laid side by side with the turns surrounding both will, most likely, be suitable here ... Regards, JS |
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