J Pole Vs Collinear

Collinear Super-Js work pretty well and are cheap to build. The J Pole often suffers because most tend to ignore common mode issues which leads back to lame incomplete antenna design.

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By replacing the phasing stub with a simple coil the answer is yes.

J pole vs collinear. Indeed although many folks like to bandy the gain advantage of a collinear arrangement as 3 dB greater than a single section we rarely obtain in real antennas more than about a 20-25 dB. The calculator can be used for designing a Super J-Pole antenna for just about any frequency or it can be used for the standard J Pole antenna by leaving out the top section. Note the collinear 58 wave J-Pole does indeed perform about as well as a regular J-Pole in these circumstances at this particular azimuth.

This causes the two collinear 12 wave radiators to be fed in-phase causing their signals to reinforce. A traditional J-Pole consists of a 12 wave radiator and a roughly 12 wave tuning U at the bottom of that radiator. J-poles are actually end-fed half wave antennas.

Hey Danny great questions. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. The collinear J-Pole adds a 12 wave phasing section to the top end of that radiator with another 12 wave radiator above that.

As many attest there is an advantage when vertically combining 12 radiating sections to have a bit of separation between the half-wave end points. Because the J-pole and Zepp are electrically identical in function and are similar to all other end-fed antennas in problems pages on J-poles Zepps and end-fed verticals overlap. The half-wave collinear J-Pole beats out both antennas by about 2 dB.

Fret not J-Pole lovers. The collinear J-pole will radiate 1000 watts with no sweat. Properly aligned and phased a collinear array can provide a 3 dB or more increase in signal strength.

Get 08 dB more gain out of the trusty Super-J by replacing the traditional phasing stub with a long coil. Thank you Danny ZS6XOX 73s ZS6XOX May 8 2016 1. While not found often in commercial environments the J-Pole still has a place.

The Super J Pole yields about 6dB gain - over a 14 wave ground plane by adding one 12 wave section to the top of the regular J Pole with a matching section between the two. If true this is considerably more that a j-pole. There is an advantage when vertically combining 12 radiating sections to have a bit of separation between the half-wave end points.

WB3AYW and KK1CW VHFUHF COLLINEAR J Pole with Short SpacedCoils for 146mHz. Again all three antennas gain is very dependent on the height above ground. I hope some folks answer your first would the.

The result is the Collinear J-Pole. Build and Review Dual Band J-Pole 144440Mhz New River Valley Amateur Radio Club N4NRV. This value is about 23-24 dB higher than the average gain of a single-radiator J-pole.

The collinear J-Pole often known as the Super-J does improve the behavior over a regular J-Pole. Feel free to browse the forums for information articles and much more. The antenna I constructed was made of 12 tubing.

J-Pole or Half-Wave End-Fed Zepp Antennas. The Super J-Pole antenna for 430 - 450MHz was constructed and used for FM simplex and repeater operation at my previous residence in Melbourne Victoria from 2002 - 2007. Commercial collinear base antennas multiple ⅝ wave elements means more gain lower takeoff angle watch out for overstated gain figures.

Gain is 3Dbi not Dbd. Welcome to 4x4 Ham. J-Pole Radio Antennas.

Otherwise the J-Pole is just a half-wave radiator like the coaxial dipole with a slight height advantage. The J-Pole enjoys the most gain at around 6 dBi with the other two antennas pretty close to this value. Yes you will have to add the cost of quality coax as you would with the most expensive antenna.

The J-Poles adjustable feed-point makes it easy to match choked or baluned feed-line to the antenna assuming the J-Pole resonates correctly of course. The Super J Pole antenna is a co-linear vertical consisting of a number of half wave length vertical elements separated with half-wave length stubs Tuning stub feed with a. Thus the J-Pole always has a slight advantage.

Here is a closeup of the lobes on the right Close up of EZNEC J-Pole Lobes. Why not just buy a collinear designed for ham band. Also would a Super J-Pole collinear be better for my application than a normal J-Pole.

A collinear J-pole will match 1 to 1 across the band and give you about 9db of omni-directional gain for about 2500. The coax shield has to be at zero volts potential. A collinear antenna also called co-linear or collinear antenna array is a set of dipole antennas aligned along their length so they form one long line.

K4KRW Collinear J-Pole Bob K9TMUs Slim Jim Variation on J-pole dual band easily built from a piece of 450 ohm ladder line. K6CLS Ham Member QRZ Page. The claimed gain is 5Dbd.

The Super J-Pole AntennaCollinear Design Below is a Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole. 4x4 Ham - Status Update 2019. The Antenex appears to be a collinear.

The traditional collinear J-Pole aka Super-J improves the basic J-Pole. Are further improvements possible. Improving Gain of the Super J-Pole Antenna - The collinear J-Pole often known as the Super-J does improve the behavior over a regular J-Pole.

This community is dedicated to Amateur Radio and the ways we use it outdoors and offroad. Improved 2 Meter Performance with a Three Element Collinear J-Pole. WB3AYW and KK1CW VHFUHF COLLINEAR J Pole with Short Spaced Coils for 146mHz.

Both can be greatly helped by adding decoupling sections at. Each element of the dipole antennas is 12 wavelength long. 11 Meter CB Radio J-Pole Antenna.

The bottom J-Pole is roughly a. An Even Better J-Pole - Electrically The gain is about 74 dBi. Build a short spaced vhf uhf collinear J Pole with very high gain.

Design your Own Super J Pole. It is tuned for 465Mhz so it would not work well in the 70CM band. The buck0 58ths wave collinear J-Pole does perform.

Illustration Of The J Antenna And Four Other Variations Including Slimjim Super J 5 8ths Super J And Collinear J Ham Radio Antenna Ham Radio Radio Antenna

J Pole Antenna Variations Source Wikipedia Antennas Antenna Ham Radio Antenna