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#1
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Back around 2007, with the radio shop in Los Angeles, I wanted
to make a antenna distribution system. So one antenna could "source" multiple radios. having an antenna to test radios being repaired on the bench and showing off radios up in the front to customers. I built a small amplifier to do that with. Didn't work. Got distracted and went onto other things that took priority. Around January, I decided to have another go at it. Found out why it didn't work and wet about fixing it. Turns out it NEVER would have worked at all. Sigh, always something. Then sitting in the bathroom, re-reading a 4-5 year QST magazine I stumbled across a nice "antenna multi-coupler" project. Except that the parts used were already obsolete. So I came up with a substitute and surprisingly that worked quite well. Now I need an antenna that works across a broad spectrum. From broadcast band (0.54 to 1.7 MHz) and up through 30 MHz. Enter the whole terminate folded dipole project up on the roof. It's finally up and assembled. All 122 feet of it. And it seems to work amazingly well over the entire range. Technically, I have accomplished my goal. But of course, it _would_ be nice if I could use this antenna for transmitting as well since I'm am licensed to do so. So that's where the extra "flailing around" comes in. I have ordered some commercial parts for less than it would have cost me to fabricate them myself. Those should be here Friday or next Monday. I'm hoping that solves the transmit issue. But as I said, the original goal has been met. Quite well. Jeff-1.0 wa6fwi |
#2
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On 6/6/2013 12:23 PM, Foxs Mercantile wrote:
I have ordered some commercial parts for less than it would have cost me to fabricate them myself. Those should be here Friday or next Monday. I'm hoping that solves the transmit issue. The parts came in. A 300 watt 800 ohm termination and a 1 KW 16:1 balun. Without any antenna tuner, the as measured SWR is at or below 2:1 to one and in some cases 1.5:1. This is on all bands from 1.8 MHz to 30 MHz. This is well within the range of "ok" as is and the internal antenna tuners make quick work of it. Jeff-1.0 wa6fwi |
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