Ocf Antenna Design

OCF Dipole Antenna Windom HF. Buckmaster Off-Center-Fed OCF Dipole – Multi-Band Antennas 4-Band does 40 20 10 and 6 meters no tuner requiredLegs are 23 and 45 feet 7-Band does 7580 40 20 17 12 10 and 6 meters no tuner requiredLegs are 45 and 90 feet 8-Band does 160 7580 40 20 17 12 10 and 6 meters tuner may be required for 160.


Ocf Dipole

Most people still believe a Windom MUST be fed at the 13 – 23.

Ocf antenna design. What you see is what you get. If feeding the antenna up to a ratio of D1D2 of 13 is more convenient to the shack then do so. Off Center Fed Dipoles are popular multi-band antennas.

W2AU Balun in place. Loren Windom W8GZW8ZG was the first to reveal the Windom antenna to the radio amateur community by describing the antenna in the September issue of QST. Its a dipole fed off center with a 41 current balun at the offset feedpoint.

The rationale for the design is that it is a short dipole not requiring. H w ev hc l ign si nc eb r- u d t oh p. These are measured results not a model.

The big advantage of this design is that you can make an antenna that does not require an antenna tuner by utilizing the constant impedance of the happy convergence that happens at. Design Parameters For an 80-10 meter OCF dipole antenna divide the ½ wavelength standard of 468 by the lowest operating frequency of 36 MHz and you arrive at an overall length of 130. The OCF or Off Center Fed Dipole antenna is much like a conventional dipole antenna in that the formula you use to calculate the length of it is the same.

Hence the best installation for an OCF is a matter of convenience. The Off-Center-Fed Dipole is a Dipole whose feedpoint is at a point removed from the center of the antenna. The center-loaded off-center-fed dipole is the original invention and work of Serge Stroobandt ON4AA.

A coax-fed 7-band 80m OCF for home use. This is the length of a standard dipole but instead of dividing the result in half use a 3664 offset to determine the feedpoint. If your are serious about playing with the design of the OCF antenna on your own do yourself a favor and invest in a good antenna analyzer which can scan the HF spectrum.

We have complete OCF antennas and also the impedance transformers and chokes as separate products see below for various options with and without vertical radiators. It is an off centre fed dipole with 10 feet of vertical radiator. The downside of this antenna is you are not able to adjust the SWR curves of the bands individually.

It also works fine on all bands above 40m with a tuner and even below 40m on 60m and 80m although the coax losses will be higher. I now have two OCF antennas in operation. The antenna was described in QST and a commercial version was available at time of writing.

If you cut the length for good coverage of the high bands the lower band resonances are lower than ideal. An antenna that will operate well on all Ham bands with minimal assist from the tuners included in many modern transceivers. The antenna shown covers 80 40 20 and 10 meters with 15 meters and WARC bands.

For a conventional antenna I would normally split this wire in half and place a feed point in the center. This is the length of a standard dipole but instead of dividing the result in half use a 3664 offset to determine the feedpoint. If you cut the length for good coverage of the.

After its initial publication on the Internet in 2007 the CL-OCFD was subsequently described in the following publications. For an 80-10 meter OCF dipole antenna divide the 12 wavelength standard of 468 by the lowest operating frequency of 36 MHz and you arrive at an overall length of 130. 468 Frequency Mhz will give you the overall length of the antenna.

A commercial antenna system the Buckmaster 7-band OCF Dipole exploits this property. Coax fed OCF Windom antenna. Again this is based on a feed point height of.

Design Parameters For an 80-10 meter OCF dipole antenna start with a total length of 13585 feet of insulated wire and place the offset at 3926 feet from one end. The very predictable pattern of a resonant dipole applies only to the lowest or design frequency of the OCFD and the patterns for all bands above will be distorted. Under Antenna Design Links.

The OCF does work. This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. Httpsamznto3hplfbnIsotip butane soldering iro.

The Design Principles of OCF Masters Antennas Introduction. Before we tackle the claims made about the OCF antenna lets start by saying that it will work but not significantly better than a dipole of the same length. Homemade Carolina Windom antenna.

Note 1 BACKGROUND FROM WINDOM TO OCFD 1927 September. I build an 80 meter off center fed dipole antenna for this years ARRL Field Day Event. OCF Dipole – This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning.

An swr indicator is needed an MFJ analyzer is hog heaven First get overall length for lowest swr at lowest freq. Here is my home HF antenna. On 40-20-17-15-12-10 meter models we use a resonance compensator to pick up the 15 meter band not present on many competing OCF antenna products.

The short end was placed at about 40 feet off the ground tied to a tree limb using about 10 feet of insulated rope. It needs no tuner on 40m 20m and 10m. Multiband HF antennas part 3 Windom and OCF dipole.

Both of these proved to be more suitable for modern day transmitters with a 50 ohm output than the original Windom antenna design. The OCF short vertical dipole for HF has become popular particularly disguised as a flag pole for low impact installations and encouraged by claims of outstanding performance. Legs are 90 and 180 feet.

The half-size version is known as the FD3 40-20-10m antenna. The antenna was a half. KF9F Revives an OCF Dual Feed Multiband Dipole This multiband 160 thru 10 Meter antenna design was adapted using the dual feedline technique from and old 73 Magazine Article published in 1984 by W4HDX Note that both ends of the feedline are.

MFJ 913 41 balun. The key to obtaining more bands from any Windom or OCF is the positioning of the feedpoint. The 7 band OCF Dipole antenna was erected at 25 to 30 feet on a hill side using a military style push up mast with a few customization on it.

40-10 m OCF antenna layout. They work pretty well but the resonances dont line up in all the bands as well as we would like. It is a dipole fed off center with a 41 current balun at the offset feedpoint.

The antenna was originally designed by Richard F o rm at sK1P O. Multi-band Windom antenna but fitted with a 200Ω 41 balun at its feed point and fed with 50 ohm coax at lower heights above the ground. OCF Dipoles – About windom antennas and OCF.

The 9045 OCF DP with 41 balun hanging from three pulleysropes in a inverted vee like configuration is a near perfect antenna if adjusted in this order.


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