That's an old and valid technique for broad banding an antenna. Throw away 3 dB of power and you can avoid ever seeing an SWR over 2:1 across a huge frequency range. Sure, 3 dB may sound like a lot, but for applications such as the military where simple, broadband antennas are a must it's a worthwhile tradeoff. After all, they are not trying to bust a pileup halfway around the world with a QRP signal.
I believe B&W still sells their 90 foot "folded dipole" that features just such a broad banding technique to cover 1.8 to 30 MHz. The US Army uses a lot of them. The laws of physics still hold. A small, efficient antenna will be a narrow band antenna requiring adjustment of a matching network over relatively small frequency excursions. 73, Ron AC7AC -----Original Message----- Another two cents worth ... A few years ago there was a dipole advertised in QST and other places that claimed to be "broadband with a very low SWR on all bands". Turns out an XRAY of the junction box / center insulator revealed a resistor (50 ohms?) in parallel with the coax connector and the dipole. (;-) 73! Ken - K0PP ---------------------------------------------------------------------------- ------------------------ Excuse me for being ignorant... Cut and paste from the Chameleon web page "antenna base has an integral broadband impedance matching network allowing broadband antenna tuning. An external antenna tuner is required to provide a low VSWR." I see very little difference between this antenna, a PAR EFHW or any other EFHW that uses an impedance matching unit. Just my 2 cents worth Flame suit is ON.!! -- Dave G KK7SS Richland, WA '59 Morris Minor 1000 - working on it :| '65 Sprite - running :) '76 Midget - co-owned with #4 Son :) '06 Honda Civic Hybrid ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
