4405471818 - Off Center Fed (OCF) Dipole Baluns

MINI-BALUN 4:1 Coax Interface to Ladder Line, Loop, OCF antennas 500 Watts PEP, 1-61 MHz

Name: MINI-BALUN 4:1 Coax Interface to Ladder Line, Loop, OCF antennas 500 Watts PEP, 1-61 MHz
Brand: Palomar Engineers
SKU: MB-4-500SS
Price: 69.95 USD
Availability: InStock

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:200 ohm (4:1) Transformers

SKU MB-4-500SS

$69.95

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MINI-BALUN 4:1 Coax Interface to Ladder Line, Loop, OCF antennas 500 Watts PEP, 1-61 MHz

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:200 ohm (4:1) Transformers

Product Details

Brand: Palomar Engineers

MPN: MB-4-500TS

Country/Region of Manufacture: United States

Effective Frequency Range (MHz): 1-60

PEP Power Rating (watts): 500 SSB (25% duty cycle), 250 Watts CW/FT8 (50% duty cycle)

Estimated Insertion Loss (db): .25 db

Input Connector Type: SO-239 female

Output Connector Connector Type: Dual 1/4" stainless steel studs

Enclosure Size (LxWxH inches): 3" long, 2 in wide, 1.25" high

MINI-BALUN Features:

- Uses proprietary Multi-Turn, Multi-Ferrite technology for maximum power transfer and minimum SWR

- 500 Watts PEP, 50 ohm SO-239 connectors In, Dual Side Stud Output, 1-61 MHz (usable to 100 MHz) - AKA 4:1 BALUN

- Works for coax fed antennas from 1.8-61 MHz (160-6 meters) - excellent for multi-band loops, OCF, G5RV/ZS6BKW or Flag Pole OCF antennas fed with ladder line.

- 2-5 times more wider bandwidth and higher power then competing baluns of similar power ratings

This balun has a SO-239 input and 1/4" side studs output.

For Higher Power needs use our CB-4-1500TS or CB-4-5000TS

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:

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

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

73, Ernest – W4EG