Off Center Fed (OCF) Dipole Baluns

442300386 - Off Center Fed (OCF) Dipole Baluns
+3

Ferrite Snap On Combo Pack, Mix 31, 61, 75 ID=1/4"/6.3mm, RFI Range 150 KHz-2000 MHz, 10 Filters

FSCP-316175-1/4-10
$49.95
In stock
1
Product Details
MPN: FSCP-3161-1/4
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .25/6.3
OD (A) - in/mm: .788/20
ID (B) - in/mm: .26/6.6
Length (C) - in/mm: 1.55/3.94

Now you can get a ferrite snap on combo pack of 10 RFI filters in 1/4" size with all three filter ranges (great if you don't know the interfering frequency and need to cover the entire range when troubleshooting an RFI problem).

Mix 75 covers 150 KHz to 10 MHz (3 filters)

Mix 31 covers 1-300 MHz (usable to 500 MHz) (4 filters)

Mix 61 covers 200-2000 MHz (3 filters)

Use multiple turns for best results. (2 turns - 4 times a single turn, 3 turns = 9 times a single turn, etc.)
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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