Off Center Fed (OCF) Dipole Baluns

1725564652 - Off Center Fed (OCF) Dipole Baluns
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DC-AC Inverter Common Mode RFI/Noise Filter Kit for DC in and AC Output

RFI-INVERTER
$34.95
In stock
1
Product Details
MPN: RFI-INVERTER
Type: NEW
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): n/a
RFI Suppression Range (MHz): 150 KHz - 10 MHz
Typical Use:: DC-AC switch mode inverters common mode noise suppression

The RFI-INVERTER is a common mode noise filter set which filters both the DC input and AC output of DC-AC inverters. These filters effectively isolate the DC power cord and AC output cable from acting as antennas for the internal switching power supply. The filters suppress RFI from 150 KHz to 10 MHz. Simple to install on cables without any device modification. DC filter is a ring and AC output filter is a snap on with 1" inside diameter hole.

For larger cables use the ACCF-3 and DCCF-3 ring filters with 3" inside diameters and use multiple turns on each cable for best results.

AC power strip shown in picture NOT INCLUDED - this is user supplied and shown for illustration of filter installation.



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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