Off Center Fed (OCF) Dipole Baluns

1059403587 - Off Center Fed (OCF) Dipole Baluns
+3

Solar Micro-inverter/PV Module Noise Filters (2)-ID=1.4" Ring, 1/2" Snap On

RFI-PV-MI
$24.95
In stock
1
Product Details
MPN: RFI-PV-MI
Type: New
Country/Region of Manufacture: United Stats
Filter Power Rating (PEP watts): not applicable
RFI Suppression Range (MHz): .1-10
Enclosure Size (inches): none

The RFI kit is designed to suppress RFI caused by Solar micro-inverters, power optimizer, and solar arrays by electrically isolating the “antenna” wires used to connect the various devices.The cabling between the PV array, the micro-inverters or power optimizers and their connection to the electrical bus combining their individual outputs can be considered “antennas” for the pulse switching circuits of the individual devices thereby causing radiation at very low fundamental frequencies with harmonics that can cause undesirable radio interference in the 1-30 MHz (and sometimes higher) frequency range.This interference may be objectionable to the owner of the solar installation as well as neighbors who may also experience the interference to their electronic devices.

THE RFI KIT FILTERS ONLY SUPPRESS COMMON MODE CURRENT (SIGNALS) THAT ARE COMMON TO ALL WIRES IN THE CABLE, AND DOES NOT EFFECT INDIVIDUAL DIFFERENTIAL SIGNALS ON EACH WIRE. THE FILTERS HAVE NO EFFECT ON THE NORMAL SIGNALS CARRIED WITHIN THE CABLE.

Micro-inverter RFI

Ferrite cores (snap on) are snapped over the two (+/-) cables from the solar array module and the two wires hooked to the “string” connecting the micro-inverters together. Suppressing RFI on all wires in and out of the micro-inverters helps to reduce any broadband RFI “noise” generated in the SOURCE switching circuits (typically at 50-200KHz and harmonics thereof). Two ferrite cores are required for each micro-inverter/PV array – one ring for the PV DC cables and a snap on for the micro-inverter cable to the string bus – size to fit the trunk cable with 1 or 2 turns.

Application Note for Enphase M190/M215/M240/M250 series Micro-inverters (and similar other brands). For each PV array/micro-inverter use a RFI-PV-MI filter kit with a ring (ID=1.4″/36MM) ferrite for installation on PV module DC cables to micro-inverter and a snap on (ID=.4″/10mm) filter for the data/trunk cable output of the micro-inverter. At the connection of each junction box and the Engage cable install a RFI-PV-JB filter (ID=1″/26MM) with multiple turns through the center.

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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