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#24
October 29th 14, 04:10 AM
posted to rec.radio.amateur.antenna
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Loop Antenna at ~60 kHz
rickman wrote:
On 10/28/2014 9:27 PM, wrote: rickman wrote: On 10/28/2014 8:18 PM, wrote: snip Not sure what you are saying. There are tons of examples. But when I did my search there was very little info on the design of loop antennas. At least not much in depth enough to let me figure out how much signal I might get from a given circuit. I am asking about specific details of loop antenna design. I'm not sure why people keep suggesting I look at "examples". WWVB is a US time and frequency standard station and the Internet is full of articles on DIY antennas and receivers for WWVB. Many of those articles go into great detail about their design. As you asked about 60 kHz, it would seem to me to be the place to start to look for words of wisdom on the subject, no matter what particular detail you are looking for. I believe I said I have read much of that info. I did this a couple of Yes you did, after you made the post I responded to. years ago and picked an approach. I was not able to convince myself it would work properly. So now, before I build anything more, I would like to fill in some of the details. Of all the design info I found, not one discussed optimizing the antenna for maximum voltage. When I was discussing this in another group, specifically about a spice simulation of the circuit, someone pointed out that I needed to include the effect of the radiation resistance. Again, I have not found any other discussions of the radiation resistance of a receiving antenna, specifically a tuned, shielded loop antenna. Is this a red herring? When designing an antenna with a very high Q, can the radiation resistance of a shielded loop antenna be ignored? The radiation resistance is a reciprocal property, i.e. it is the same for transmitting and receiving. I will assume you already know the relationship of resistance to Q. You say I should "start" with the many words of wisdom on the subject. I am not "starting" and I have found many words of wisdom on loop antennas in general, but not much on the specific questions I am asking. That's all well and good but not evident until way into the postings. It's a little bit funny, but when the one who shall not be named asked about short antennas the discussions were full of info on radiation resistance and details. Now that I am asking about my design, no one wants to discuss the technical issues and just recommend some site where they tell you how to build the antenna that suited their purpose. Again, radiation resistance is a reciprocal property. To determine such things, you need to use an antenna analysis tool and plug the resultant numbers into Spice which will tell you whether or not it can be ignored. -- Jim Pennino |
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