Can't down load ARRL for loaded coil dimensions. Did find something that said 10" dia - 5" tall with 14 GA wire. From the plans I had gone off of it was mor like 1/2"dia - 5"tall with 14 ga. Can I get a verification on the 10" so I can refit it...Thanks on the other dimensions I will refit those too. You have been a Great help.
Thanks, Gayle KF5LVZ On Sun, Jan 8, 2017 at 5:15 PM, Rick Hiller -- W5RH via BVARC < [email protected]> wrote: > Using 52 MHz for the design freq...your lengths are off. > > A typical 5/8wl ground plane is a total of 1 wl worth of vertical, > matching/loading coil and gp radials all in series. > > Feed point is shield to the radial set / bottom of coil point and the coax > center to a tap up the coil at the 50 ohm point. > > Vertical should be 5/8 wl or about 11.5 feet. The matching / loading coil > makes up an electrical 1/8 wl and the GP radials make up 1/4 wl or about > 4.5 feet (54 inches). The coil turns/size/etc.can be figured using the > ARRL Antenna Handbook and the charts for a loaded dipole of 50% length and > coil at the center feedpoint...divided by 2. > > I have always found that 5/8ths systems are tricky to homebrew and get > tuned....but that is just me. Use a GDO to see what your system resonance > is. Once you get resonance to 52 (or so) MHz, then you can start matching > the coax...but you got to get the lengths right first. > > Hope this helps.....GL and 73...W5RH > > > > Rick Hiller > *The Radio Hotel* -- W5RH > > > > On Sun, Jan 8, 2017 at 4:16 PM, Gary Sitton via BVARC <[email protected]> > wrote: > >> Get SWR at 3 freqs. to get a feel for where the lowest SWR freq. might >> be. Then you can change the loading coil tap or antenna length. >> Gary >> >> Sent with AquaMail for Android >> http://www.aqua-mail.com >> >> On January 8, 2017 3:56:23 PM Gayle Dotts via BVARC <[email protected]> >> wrote: >> >>> Almost finished my first home built 6 Meter antenna, 13.5 feet tall with >>> 49" radials. This is coil loaded from the bottom 10 turns. The plans say >>> 14GA coated wire and tap. I think the wire should be bare for the tap >>> (aligator clip) to connect to. Plans don"t say this. By the way SWR is way >>> high.3.0. Any advice. >>> >>> Thanks, >>> Gayle >>> KF5LVZ >>> _______________________________________________ >>> BVARC mailing list >>> [email protected] >>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>> >>> >> _______________________________________________ >> BVARC mailing list >> [email protected] >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> >> > > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > >
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