Off Center Fed (OCF) Dipole Baluns

3434492443 - Off Center Fed (OCF) Dipole Baluns
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DSL/Cable Modem/Router/Ethernet/Internet RFI Kit - 3 Filters

RFI-ROUTER-4
$19.95
In stock
1
Product Details
MPN: RFI-ROUTER
Type: New
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): n/a
RFI Suppression Range (MHz): 1-300 MHz
# Ferrite Filters: 3 or 5 depending on model
Enclosure Size (inches): n/a
Typical Use:: 1-2 turns on all I/O cables

Use for DSL/cable modems, routers, access points, repeaters, Ethernet switches, etc.

The RFI-ROUTER-4 kit is meant to be used with a DSL Modem/Router with incoming DSL signal, up to 4 Ethernet lines and a single power DC power supply line coming into the device.Included are one snap on ferrite (3/4” hole) and two (3/4” hole) snap on split ferrite beads for the Ethernet outputs (2 per snap on using multiple turns for each cable). The additional 3/4" snap on is for the power supply line. The RFI-ROUTER-8 kit is identical but has 2 additional ferrite snap on for up to 4 additional ports,

Useful for all brands of computer equipment.
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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