Off Center Fed (OCF) Dipole Baluns

3185527342 - Off Center Fed (OCF) Dipole Baluns
+3

Audio RFI Suppressor for XLR cables - Simple in line filtering with male/female extension, Select AM Broadcast or Ham Band Filter Range

RFI-XLR-6AM
$29.95
In stock
1
Product Details
MPN: RFI-XLR-AM, -HAM
Country/Region of Manufacture: USA
Units in product: 1

Suppresses radio frequency interference (noise) on balanced audio lines using triple filtering with:

¨ Shielded cable protection

¨ Highly Effective Inductive Ferrite Filter

¨ Effective for RFI

Select RFI-XLR-AM for broadcast band filtering (500 Khz-5 MHz)

Select RFI-XLR-HAM for 3-30 MHz ham bands 80-10 meters

Up to 30 dB common mode noise suppression

Use for interference from transmitters, wireless mic, and noisy power supplies. Install in series with cables for mic, line, amp/preamp interconnects, and speakers.

Standard cable length is 6 feet.

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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