WebThe impedance of a half-wave dipole rises as we move the feedpoint off-centre - away from maximum RF current (minimum impedance of 70-72 ohms)... and into increasing RF voltage territory. Manufacturers of off-center-fed dipole antennas choose an offset feedpoint where the theoretical impedance is approximately 300 ohms on the antenna's ... WebImpedance Matching Methods . Literally thousands of articles have been written about antenna impedance matching. Whatever method you choose to achieve an impedance match is fine, as long as the antenna element is DC grounded! This can be accomplished using a shunt coil (preferred method), an UNUN, or stub matching, all covered below.
Homebrew Hamstick Dipole
WebMINI HORIZONTAL "V" 2 ELEMENT "HAMSTICK" 20M BEAM. by Russ Wilson, VE6VK Material Required: 4ea 20M "Hamsticks" 1 inch diameter boom 4 ft 6 inches long. ... Impedance 25 ohms SWR 2:1 The antenna was resonated to 14250 Khz. A hairpin match was made using #14 gauge electrical wire with insulation removed. Two lengths 18 … WebJul 5, 2024 · I guess next step is to check the impedence values at those frequencies. When the nmo30 and hamstick comes in about a week I will have to rerun the sweeps. The 1:1.7 swr I started to think was due to the terrible ground plane interactions. Bending the antenna away from a pillar resulted in an swr that dropped a few hundreths. peg ratio of axis bank
Question about using mobile HamStick on 75 meters - Google …
WebImpedance using omoga bridge: 48 ohms at 15 feet off the ground. FEEDING = 1 wavelength of RG58U and a 1:1 balun FREQUENCY COVERAGE = 14.070 to 14.295 flat TOTAL WEIGHT (INCLUDING CARRYING TUBE) = 12 lbs. ... Since there are several different "Hamstick" type antennas out there, some experimentation WebJul 31, 1999 · The 'Q' of a Hamstick is pretty low on 75m. The ARRL Handbook. reports that a 75m mobile antenna with 'Q'=300 for the coil has. a 16ohm feedpoint impedance (SWR=3:1) which does require some. form of matching at the base. But a 'Q'=50 coil will exhibit. a feedpoint impedance of about 47 ohms and not require any. matching at the … WebHamstick antennas, the values of capaci-tance that properly match the antennas are shown in Table 1. Antenna Mount with Capacitive Base Matcher A 1 pole, 12 position, rotary switch is used for the capacitor selection. The schematic of the capacitor switch is shown in Figure 3, and a photo of this switch fully loaded with capacitors is shown in ... peg ratio of amazon