Posted: 1/19/2010 5:52:59 PM EDT
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Anybody have any luck with the inverted L type antennas? Ive been browsing the internet looking for all the info I can on them and think I have the basics down. I know they are used quite a bit on 160m just to make things easier to fit compared to a dipole for the band.
Due to the size of my yard and wanting to make an easier fit with performance to boot I am wanting to build one for 80m (3.58mhz psk freq) thus using the standard formula 234/freq to come up with 65.4' total length. I am hoping to run it up my 35' tree and use a pulley at the top and then run the remainder out to either a pushup pole or run it down as a sloper like my current end fedz. Also, am aiming to install around 16 random length radials attached at the base and fanned underneath the horizontal part of the wire. I have read and also found conflicting info in needing a 4:1 unun at the base to allow for multibanding. Multibanding for me would be 80m-17m if possible with this design. Since my only coax is RG-8x I would probably try and find some RG-213/u or something similar for the 125' run out to the base. I'm thinking I should probably pick up around 140-150' coax length so I could make 17 or so turn around a 4" pvc pipe to prevent any rfi probs coming back. And of course this all fed into a MFJ-993b or MFJ-929 external tuner. Anybody have any ideas or insight into the inverted L's and anything I need to do different? |