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Could this design be adapted to have the power supply through the coax? Cor Beijersbergen van Henegouwen For a simpler and better acitve dipole that really works, I have one, try

Hi, In the article on the active antenna the author shows two versions ... one version is a mono pole, the one you mention that uses a ground rod. The other version uses a dipole. The dipole version

I think you are seeing the capacitors he added. He says he added 1 mf ceramic capacitors, and that the diodes were not noisy, because they "did not reduce the noise at the lower end of the NDB". He

Are you speaking of the active whip that he mentions works well at SW too? As this one needs a ground rod its one of the antenna's I wont be able to use (4th floor apartment building no lighting rods

Hi Will, You are right it is important to take care when dressing antenna feed line, especially when dealing with a dipole (balanced) antenna in order to minimize antenna/feed line interaction which

Note that of the second power supply here, 12 volt AC/DC #273-1776, Dallas says; "It turned out that the diodes in this power supply were not noisy like the diodes in the bridge I used for the 24 VDC

Here is an interested active antenna: http://www.elecdesign.com/Articles/Print.cfm?ArticleID=6244 Has somebody in this group built one? --- timo

Richards, The MFJ-956 and MFJ-16010 tuners are both intended for use with random length wire antennas... not loops. MFJ does make loop tuners. The MFJ-933 and -935 but they are not Z-match designs.

Hi: Let me help with your questions .... the short (1 meter) antenna is connected to the FET in either a mono pole or dipole version of his circuit. The gas discharge tube is a safety device that will

frederick1444 schreef: http://amradioantennas.com/ about 40 cm dia. I have made FM loop with dia 86cm, good directivity. Marc -- -- Shortwave transmissions in English, Francais, Nederlands, Deutsch,

<http://www.kongsfjord.no/dl/Antennas/Some%20Of%20My%20Favorite%20Small%20Antennas%20For%20MW%20And%20LW%20rev%202.pdf> OK... There are some issues I see with my VERY little experience (basically,

--- In loopantennas@..., "gfreport1" <gfreport@...> wrote: <snip> Thank you William, much appreciated. If you have any additional info later about the power supply its most welcome. I will

Hi, I am looking for an effective antenna to use that will pull in local AM stations more clearly, about all I hear on AM now is static. Do loop antennas work for FM stations? I would like better FM

OK -- yet most Z match tuners seem to be home brew. Does either my MFJ-956 or MFJ-16010 tuner qualify? Or do I need something else? IS there an inexpensive commercially made one that works for cheap?

Richards, Like Jim Dunstan said the loop doesn't need to have a tuning cap. You can use a simple wire loop with a remote tuner. Google for "Z-match" and you will find a simple and very capable tuner.

Not easily done. Loops are inherently low impedance antennas, and when you're well below the first resonance they look a lot like an inductor. As you approach the resonance, they begin to look like a

I wish I could find a simple design for a SWL loop antenna that would cover, at least, say, between 5 and 10 MHz. Just something simple I could stick up in the yard, maybe. All these amplifiers,

Hi Len, You are correct on all counts. The original purpose of the arrangement was to provide a decent antenna for my SWL activity (Sony 7600 receiver) from 5mhz to 15mhz. The tuner sits inside the