Off Center Fed (OCF) Dipole Baluns

811140044 - Off Center Fed (OCF) Dipole Baluns
+3

Slip On Feed Line Choke/Isolator - 1/4"/6mm coax cable, RG-58/LMR240, 1-100 MHz

SLO31-1/4-5
$17.95
In stock
1
Product Details
UPC: Does not apply
Brand: Palomar Engineers
MPN: SLO31-1/4-5, -10, -15 - old part # is BA-58-5, -10, -15
Effective Frequency Range (MHz): 3-300 (5 bead), 1.8-300 (10, 15 bead)
PEP Power Rating (watts): same as coax cable rating
Choking Impedance Range (ohms): 5 bead: 500-1300, 10 bead: 600-1800, 15 bead: 1000-2100
Common Mode Attenuation (db): 5 bead: 16-22 db, 10 bead: 17-25 db, 15 bead: 21-27 db
Estimated Insertion Loss (db): .025
Input Connector Type: none
Output Connector Connector Type: none
Ground Connector (Y/N): none
Enclosure Size (LxWxH inches): none

Includes protective heat shrink

1/4″/6.4mm max Cable Size Chokes

For use with RG-58, RG-6, RG-59, LM-240 and similar size cables – all cable impedances, 160-6 meters. Choke diameter 0.6 inch. Requires 9-1/2 inches of cable for installation of SLO-1/4.Choose SLO-1/4 (5 beads) or for extended choking, choose SLO-1/4-10 (10 beads) or for super extended choking choose SLO-1/4-15 (15 beads).Use SLO-1/4 on RG-6 to stop RFI on cable/satellite systems.


Select chokes with minimum of 500 ohms at your frequency of interest for best results or upgrade to our CUBE(TM), or Super Choker(TM) or Maxi-Choker(TM) chokes up to 10,000 ohms choking

Use on RG-6 coax to stop RFI on cable/satellite systems.

Select 10 bead version for 160 meter use, 15 bead version for even higher choking power.

Snap On and Slip on Feed line chokes available in sizes to fix cables with outside diameters of 1/4", 3/8", 1/2", 3/4", 1" - check website for other size options.

This product was previously named BA-58

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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