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It includes a microprocessor, A/D converters, and a low-power "transmitter" with 4 digit frequency readout, continuously variable from 0.5 to 32 MHz in 6 bands.
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It runs on a 9V battery which is not included.Description from online reference:The pocket-sized VA1 is designed to check and adjust antennas, feedlines, and RF networks. It has only been used occasionally inside the ham shack, never up a tower, never out in the weather.
AUTEK VA1 FOR SALE MANUAL
AUTEK VA-1 RF Analyst Antenna Analyzer VERY GOOD This is an Autek VA1 with printed manual information from online, which is in very good condition. Modification to Attach PL259 to the end of the Fishing RodĢ0m Elevated Vertical G8ODE iss 1.3.Item: 302766659443 Autek Research VA-1 RF Analyst Very Good VA1. The modification by firmly screwing on the end cap. Remove any flux residue and insert the washer & PL259 connector into the end cap. Over the top of the washer and into the gap between the washer and connector to firmly secure the PL259Ĭonnector. Carefully position the PL259 connector in the washer ready for soldering. The washers hole is enlarged to be very slightly larger than the diameter of the The rubber disc is discarded and replaced Unscrew the nylon end cap with a rubber disc off the fishing rod. Shows the last value recorded after the antenna was optimised The MMANA-GAL calculated value.Mario G8ODE In practice, it was not possible to achieve the ideal 42 angle, however, the SWR measured with an Autek VA1 antenna analyser at the feed point is 1.4:1 and closely matches
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The three other plots are screen snapshots takenįrom the 3D Far Field screen showing the vertical polarisation. The small Farįield plot table shows the R +jX values and gain and the vertical field. Shows the antenna is tuned close to 14.15MHz corresponding to the minimum value of SWR (1.38:1).
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MMANA-GAL calculated results before, and after, optimizing the vertical wire are displayed below. See also Study of 20m quarterwave vert - elevated groundplane 1.3.pdf in the e-LibraryĢ0m Elevated Vertical Antenna G8ODEMMANA-GAL Model of the Antenna The antennas main characteristic is that it produces relatively low angle radiationĭevelopment of the elevated quarter wave vertical antenna The ground, if lower then ground losses start to increase unless the ground is good. Ideally the antenna should be at a height of about 0.2 above The currents i1 and i2 in the radials flow in oppositeĭirections and their fields cancel, consequently only the verticals current i3 produces radiation. Radials at about 45 that the antennas impedance isĪ Ground Plane antennas radials are provided in pairs and are slightly longer( 5-ġ0%) than the radiator. It can be seen from the graph that by dropping the Plane antenna becomes an vertical dipole and Of 90 the radials will combine and the ground The graph on the right shows the effect of an The radiator is carefully trimmed 1-2 cm at a time until a low SWR is obtained The design of the counterpoise system has been dictated by the Impedance to around 50 ohms ( see page 4 Theory). The elevated vertical antenna counterpoise wires are intentionally drooped as this increases the input The four radials wires should be cut to the same length as the antenna wire, but these should not be trimmedĭuring tuning. The wire lengths are calculated using theġ/ 4 wave = 234/ Frequency ( MHz) feet or 75/F (MHz) metresĬut the antenna wire slightly longer than the result given by the formula (+10% approx) and trim the wire for the best Other types with a forward powerĬalibrate will require re-calibration to full-scale whenever the SWR changes. The vertical and reposition the halo slightly on the poleĪn antenna analyser such as the Autek VA 1 is useful for this task, but with care a transceiver on low power and a good It may be necessary to dismount the fishing pole from the aluminium plate several times in order to adjust the length of The counterpoise wires are cut 5-10% longer than the antenna wire, and are used to support the antenna. NOTE:- The antenna wire is cut to the length calculated by the formula 1/4 = 234 / F MHz (Feet) or 1/4 = 75/F MHz (metres).