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Doesn't; the Screwdriver's low feedpoint impendence mean it will be less
efficient not more? -- Radio K4ia Craig "Buck" Fredericksburg, VA USA FISTS 6702 cc 788 Diamond 64 "H. Adam Stevens, NQ5H" wrote in message ... QST It's been a while since I posted all that bazooka data that made me stick to dipoles, so here goes: I've been using Hustlers mobile for almost 40 years and find them adequate; The mast I bought in 1970 only recently failed. I'm reworking my HF mobile installation around a TS-480HX and decided to graduate to a screwdriver. I bought a Tarheel 200. I prefer to operate a mobile antenna at it's resonant frequency and match to the impedance of the transmission line with a transformer. So here I present the resonant feedpoint impedances of a Hustler (small resonators), the Tarheel 200 screwdriver and a 103" whip on a bug catcher on a 54" Hustler base. All antennas on the same ball mount. Measurements by MFJ. "Resonant" implies X=0. band Hustler Screwdriver 103"/BugCatcher/54" 80 21 ohms 9 ohms 23 ohms 40 25 11 na 20 30 30 10 40 32 I really thought the huge bug catcher would do better. The screwdriver shows encouraging results for signal improvement over the others on 80 and 40. Seems the diameter of that bottom conductor on the screwdriver makes a big difference at the lower frequencies. Since the TS-480HX has two antenna jacks, I think an additional small screwdriver is in order; One for 80-20; One for 20-6. 73 H. NQ5H |
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