Off Center Fed (OCF) Dipole Baluns

1783887027 - Off Center Fed (OCF) Dipole Baluns
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50:50 (1:1) CUBE™ Ladder line to Coax Balun, 1.8-61 MHz, 5 KW, G5RV/ZS6BKW - FREE USA Shipping

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/Ladder Line to coax transformers
SKU CB-1-5000AT
$129.95
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50:50 (1:1) CUBE™ Ladder line to Coax Balun, 1.8-61 MHz, 5 KW, G5RV/ZS6BKW - FREE USA Shipping
Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/Ladder Line to coax transformers
Product Details
MPN: CB-1-5000AT
Input ohms/Output ohms: 50 ohms in, 50 - 150 ouhms output
Frequency Range < 2:1 SWR (MHz): 1.8-61 MHz
PEP Power Rating (watts): 5000

The CB-1-5000AT Antenna Tuner Balun is a 50 ohm to 50 ohm, triple core feed line choke designed to provide high choking impedance between a balanced ladder line feed line (zepp, G5RV/ZS6BKW, extended double zepp, etc.) and short 50 ohm coax feed line (to antenna tuner) at a power of 5000 watts PEP from 1.8 to 61 MHz. The CB-1-5000AT is configured as a Guanilla transmission line transformer with balanced outputs (current balun configuration). It is best used when ladder line impedance seen at the end of the ladder line to balun connection is close to 50-150 ohms. Enclosure box is 4″ x 4″ x 2″. Typical choking impedance range is 1K-10K ohms from 1-31 MHz.


Typical ZS6BKW multi-band antenna with CB-1-1500 or CB-1-5000

ZS6BKW at AK6R png - Off Center Fed (OCF) Dipole Baluns

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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