AM Broadcast RFI Kits

Off Center Fed Dipole Antenna, 20-6 Meters, 500/1.5KW/5KW PEP rated - FREE shipping in USA

SKU PAL-OCF2006-500
$139.95
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Off Center Fed Dipole Antenna, 20-6 Meters, 500/1.5KW/5KW PEP rated - FREE shipping in USA
Product Details
Brand: Palomar Engineers
Freq Range (MHz):: 14-54 Mhz
Power (PEP watts):: 500/1500/5000 watts digital
Length (ft):: 32

The PAL-OCF2006 covers 20-17-15-12-10 and 6 meters in a length of 32 feet. In most cases, no antenna tuner is needed and switching bands is as easy as changing the band on the radio. Super convenient and quick – great for contest operation! Choose 500, 1500 or 5000 watts PEP power levels.

Uses hybrid balun containing wide band 4:1 transformer + 1:1 common mode feed line choke to keep all your power on the antenna and off the feed line coax outer conductor!

Unlike Buckmaster OCF antennas (at twice the price, and no WARC band or 15 Meter operation), you can transmit and receive on 6, 12, 15 and 17 meters with our OCF - Better engineering and lower price - only from Palomar Engineers!

Also much quieter than end fed antennas!

INSTALLATION

For best results support balun at 30+ feet and ends over 15 feet. Angle of feed each side must be great than 45 degrees or 120 – 180 degrees total between each side preferred. Any length of 50 ohm feed line ok but longer feed lines over 50 feet may show reduced SWR on some bands due to losses in feed line and soil conductivity, nearby objects, etc. Due to local ground conditions, antenna height and feed line length, SWR may vary from samples shown and an internal or external antenna tuner may be required or some bands to bring SWR at end of feed line to acceptable levels. Overall length is 32 feet (7 feet and 25 feet sides).

FREE USA Shipping on orders over $100

NEED and END FED antenna covering the same bands but shorter at 25 feet and only requiring 2 supports? Check out the BULLET-2006

SWR TECH NOTE:The SWR graphs shown are specific to the conditions listed including antenna height, configuration (flat top, inverted V, inverted L, etc.) and direction, feed line length and type, geographic location and soil condition, calibration and accuracy of SWR instruments used. Your SWR measurements will probably be different and manufacturer takes no responsibility or liability for these differences beyond the purchase price of the antenna.


When considering solutions for AM broadcast (550 Khz – 1.8 Mhz) you should consider Mix 77 ferrites available in a variety of shapes and sizes.  Choose a size to give the maximum number of turns of the affected wire or cable.

AM broadcast transmits on a low frequency with large antennas.  Consequently it takes a large antenna to receive the signals.  Typical “antennas” are AC house wiring, phone lines, long satellite or cable TV cables, DSL/CAT5 lines running between rooms, etc.  The device wires that connect to these  “antennas” need to be choked with as many turns through the ferrite as possible.  Some installation examples are shown below on this page.

For AC/ DC power cords and coax cables the F240-77 (2.4″ OD, 1.4″ ID) “Donut” toroid is the most popular.  Also available are smaller toroid donuts and Mix 77 beads. Shown below is a graph with 8, 10, and 12 turns through the toroid – obviously more turns has higher choking impedance.  Mix 77 toroid products are HERE and Mix 77 small beads (for small wires) are HERE

F240 77 Turns Comparison 1024x648 - AM Broadcast RFI Kits

F240-77 Turns Comparison from .1 – 8.1 Mhz

Shown below is a graph of frequency response verses choking magnitude for a F240-77 in the AM Broadcast band for a 12 turn coil around the toroid. (Same info as above but different frequency range).

AM Band Choking Graph F240 77 1024x648 - AM Broadcast RFI Kits

F240-77 Choking Impedance in AM Broadcast Band

 

 

Typical Installations for Donut/Ring Toroids

20131210 114716 150x150 - AM Broadcast RFI Kits

AC Cable on F-240 Toroid – 6 turns

20131210 115137 150x150 - AM Broadcast RFI Kits

Ethernet Cable on F-240 Toroid – 7 turns

20131222 125533 150x150 - AM Broadcast RFI Kits

Audio or Mic cable on F240- 12 turns

 

 Extra Mix 75 Snap On Beads  HERE – VERY effective for AM Broadcast RFI