Off Center Fed (OCF) Dipole Baluns

Slip On Sleeve Chokes

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sleeve balun 45 degrees gif - Off Center Fed (OCF) Dipole Baluns

Palomar 1:1 feed line choke kits are current baluns (split output) or ununs (coax output). They consist of several models with 5-15 large ferrite beads that slip over the coax (but will not slip over a connector). Also included are three lengths of shrink tubing to enclose the balun and hold the beads in place on the cable. They work from 1.8-300 MHz (see impedance table for each product for measured choking impedance levels for 5-15 beads) and allow use of full power rating of the coaxial cable at an SWR of 1:1. No tools are required for installation, just a source of heat to shrink the tubing using a heat gun, lighter, matches.

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3345961631 - Off Center Fed (OCF) Dipole Baluns
Slip On Coax Feed Line Choke - 1"/25.4mm cable, 1.8-300 MHz
Slip On Coax Feed Line Choke - 1"/25.4mm cable, 1.8-300 MHz
SKU BA-200-5
List price $149.95
Save 27%
$109.95
On Sale
811140068 - Off Center Fed (OCF) Dipole Baluns
Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1-100 MHz
Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1-100 MHz
SKU SLO31-1/4-5
List price $24.95
Save 28%
$17.95
On Sale
811140068 - Off Center Fed (OCF) Dipole Baluns
Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1.8-300 MHz
Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1.8-300 MHz
SKU BA-58-5
List price $24.95
Save 32%
$16.95
On Sale
775856126 - Off Center Fed (OCF) Dipole Baluns
Slip On Feed Line Common Mode Line Isolator - 1/2"/12.7mm coax cable, 1.8-300 MHz
Slip On Feed Line Common Mode Line Isolator - 1/2"/12.7mm coax cable, 1.8-300 MHz
SKU BA-8-5
List price $49.95
Save 60%
$19.95
On Sale
775856126 - Off Center Fed (OCF) Dipole Baluns
Slip On Feed Line Common Mode Line Isolator/Choke - 1/2"/12.7mm coax cable, 1.8-100 MHz, 5,10,15, 20 bead option, Mix 31
Slip On Feed Line Common Mode Line Isolator/Choke - 1/2"/12.7mm coax cable, 1.8-100 MHz, 5,10,15, 20 bead option, Mix 31
SKU SLO31-1/2-5
List price $29.95
Save 33%
$19.95
On Sale
775856126 - Off Center Fed (OCF) Dipole Baluns
Slip On Feed Line Common Mode Line Isolator/Choke - 3/4"/19.5mm coax cable, 1.8-100 MHz, 5,10,15,20 bead option, Mix 31, LMR600
Slip On Feed Line Common Mode Line Isolator/Choke - 3/4"/19.5mm coax cable, 1.8-100 MHz, 5,10,15,20 bead option, Mix 31, LMR600
SKU SLO31-3/4-5
List price $99.95
Save 30%
$69.95
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Testimonial

Hi Bob,

Radio: Flex-6700 running barefoot -10 to 100 Watts max.
Antenna: MFJ-1216 – 160/80 meter OCFD wire antenna with matching network.
Elevation: Over 60 feet AGL – fully extended.
Installed: Mid November 2013

I operate mainly on the digital modes running less than 50 Watts.  All of the sudden after a few days operating with this antenna, I start to have RFI and my radio was acting up; such as changing bands, SWR changing values, radio failures and turning off. However, when I used my Hy-Gain 18 HT vertical on the same band none of the abnormality occurred.
I contacted MFJ and confirm that what I was noticing was a failure of their “matching network” AKA balun.  They offered no solutions. Then I contacted Palomar Engineers and bought the 1:1 new toroid RF beads.  I called Palomar Engineers and I happened to talked to you directly; regarding the on going issue with the MFJ antenna. I found out that the 1:1 balun was not what I needed (I was miss-informed by MFJ that it was 1:1 matching network.)
You offered to make the required balun 4:1 and the rest is history.

Here are my findings:

  1. No more RFI displayed on the monitors.
  2. Radio not acting up or turning off.
  3. The SWR at 160/80 meter is 1.2:1
  4. No antenna tuner required.  (radio goes to Bypass automatically.)
  5. Worst SWR is on 10 meter with a 2:1 but still usable, with antenna tuner 1.5.
  6. One happy OCFD user!

Thanks to Palomar Engineers design and engineering for solving this issue.

73, Ernest – W4EG