Constructing Properly Loaded Antennas for the Lower End of the AM Band - Below 800 Khz.

philcobill · 2006-02-13T22:15:15Z

I am operating an AM25 on 650 khz. All of the free frequencies here are in the lower part of the band, and 650 is about the best of them, so using a 1500 khz plus frequency is out of the question. Most of the Part 15 antenna I see here on this site and on other sites are for the higher frequencies, with one for the longwave band. I understand there are differences in efficiency between the lower and higher frequencies, but I am willing to live with it. So, without getting too complicated, can someone help me figure out how to construct a properly loaded antenna for a lower frequency like 650 khz? Currently, I am using a 3 meter long piece of pipe sitting right on top of a ground stake, with the lead-ins attached appropriately. I tried the Ramsey antenna suggestions in their manual, and it was even worse than the current set-up. Wouldn't the basic models for the higher frequency antennas would work for the lower frequencies if the electronic values for the components were properly substituted? I am operating an AM25 on 650 khz. All of the free frequencies here are in the lower part of the band, and 650 is about the best of them, so using a 1500 khz plus frequency is out of the question. Most of the Part 15 antenna I see here on this site and on other sites are for the higher frequencies, with one for the longwave band. I understand there are differences in efficiency between the lower and higher frequencies, but I am willing to live with it. So, without getting too complicated, can someone help me figure out how to construct a properly loaded antenna for a lower frequency like 650 khz? Currently, I am using a 3 meter long piece of pipe sitting right on top of a ground stake, with the lead-ins attached appropriately. I tried the Ramsey antenna suggestions in their manual, and it was even worse than the current set-up. Wouldn't the basic models for the higher frequency antennas would work for the lower frequencies if the electronic values for the components were properly substituted? PhilcoBill AKA Bill Harms Elkridge, Maryland Old Time Radio on 650 Khz

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Anonymous

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Yves,

I posted it a few hours ago in a new thread. scwis kindly linked to it from the bottom of this thread.

I hope you find it useful.

Neil

Posted : 25/02/2006 8:01 pm

Anonymous

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www.part15.us/node/637

Enjoy!

Posted : 26/02/2006 6:46 am

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