Off Center Fed (OCF) Dipole Baluns

50:112 (2.25:1) CUBE™ Balun 3-30 MHz, 1.5KW/3KW/5KW

SKU CB-2.25-1500TS
$109.95
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List price $159.95
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Output Connector
Power rating (PEP)
Input Connector
1
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50:112 (2.25:1) CUBE™ Balun 3-30 MHz, 1.5KW/3KW/5KW
Product Details
Country/Region of Manufacture: USA
Type: BALUN
Input ohms/Output ohms: 50
Frequency Range < 2:1 SWR (MHz): 3-30
PEP Power Rating (watts): 1500/3000/5000
Enclosure Size: 4" x 4" x 2" (1.5KW), 4" x 4" x 4" (3KW/5KW)
Weight (pounds): 3
Antenna Compatability: loops, quads, 112 ohm input antennas

High Power rated at 1.5KW/3KW/5KW (option) PEP (FT8 mode at 1.5KW)

Broad frequency range of 3-30 MHz for < 2:1 SWR into matched load

Compact 4" x 4" x 2" (1.5KW) or 4" x 4" x 4" (3KW/5KW) light weight weatherproof enclosure

Quick, easy deployment with either halyard hoist and side eyebolts or to stud outputs (all 1/4" stainless hardware)

Choice of BALUN (balanced outputs) or UNUN (unbalanced output and ground)

Model CB-2.25-1500, 3000, 5000 is a 2.25:1 (112:50 ohm) multi-core balun used to translate a 50 ohm input to 112 ohms at RF power levels up to 5000 watts PEP when used with a matched load such as single band delta loop, quad or loop skywire. This assembled balun features a multi-core configuration for increased power handling and flatter frequency response to over 30 MHz. With a matched 112 ohm load the SWR over the frequency range is very consistent from 3-30 MHz and SWR is less than 2:1 over the range allowing easy tuning by most radio internal antenna tuners or an external tuner.

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