You may find it works OK on 2 meters. Probably not good enough for a repeater though. There has been discussions here before about extending the elements and building new harnesses. The harness is made up of 75 ohm and 35 ohm Vaporlock weather proof coax cut to multiples of 1/4 wavelength. There was an article on the net about this by kc4fwc, one by wb0upj, and another by kc5dgc. Also look at Kevin's article here; http://www.repeater-builder.com/rbtip/exposeddipole.html
Paul kb9wlc --- chuckmf1135 <[EMAIL PROTECTED]> wrote: > Thanks i found out its a Andrew dB224 - > 155-165mhz, i was hoping it > would be in the 145mhz - 2 meter ham band range but > it seems you cant > adjust this type of antenna. > > > > --- In [email protected], "skipp025" > <[EMAIL PROTECTED]> > wrote: > > > > > > > The characteristic impedance of a folded dipole > is 300 ohms. > > > > Depends on who you ask really. The impedance of > what most people > > call a classic folded dipole is about 300 ohms. > But measure the > > various dipoles by Decibel and Sinclair you'll > probably find they > > are not all standard size dipoles. > > > > What Decibel does to match their dipole arrays is > nothing like the > > method used by Sinclair. > > > > cheers, > > skipp > > > > > 4 of them, fed in-phase, will present an > impedance of 75 ohms at > the > > > feedpoint of the phasing harness, which will > present an > acceptable > > > 1.5:1 SWR to a 50-ohm transmitter. As Nate > mentioned, some > > > manufacturers build the phasing harness with > different impedances > of > > > coax to transform the antenna array's impedance > to 50 ohms. > > > > > > As far as frequency goes, if you're saying that > the length of an > > > element, from the center of the top bend to the > center of the > bottom > > > bend is 34 inches, it's definitely a high-band > antenna. The > larger > > > the element tubing diameter, the broader the > frequency range the > > > antenna will cover, so you may get that to > perform acceptably at > 2 > > > meters. See the construction article on the > Repeater Builder > website > > > at > www.repeater-builder.com/projects/exposeddipole.html > - it's > > > pretty much the antenna you have. > > > > > > George, KA3HSW / WQGJ413 > > > > > > > > ____________________________________________________________________________________ Food fight? Enjoy some healthy debate in the Yahoo! Answers Food & Drink Q&A. http://answers.yahoo.com/dir/?link=list&sid=396545367
