Off Center Fed (OCF) Dipole Baluns

1153643713 - Off Center Fed (OCF) Dipole Baluns
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Icom A220 A220T VHF Aircraft Transceiver RFI Kit - 2 Noise Reduction Filters

RFI-Icom-A220
$19.95
In stock
1
Product Details
MPN: RFI-ICOM-A220
Type: NEW
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): = Cable Rating
RFI Suppression Range (MHz): 1-300 MHz
# Ferrite Filters: 2
Enclosure Size (inches): n/a
Typical Use:: 15 Pin Plug, Antenna Coax

BUY THIS KIT NOW TO SOLVE YOUR RFI PROBLEMS! WORKS WITH MANY BRANDS OF COMMERCIAL VHF RADIOS INCLUDING ICOM A120, A220, A220T.

Quick installation - immediate RFI/noise reduction. No radio mods required.

This kit will help reduce or eliminate:

1. Radio Frequency Interference (RFI) to electronic devices including instrumentation and GPS systems.

2. RFI from other electronic devices such as switching power supplies, LED instrument and cockpit lights, battery chargers, GPS and computer systems which generate common mode currents on your radio interface or coaxial antenna feed lines.

3. These filters help reduce SWR problems between transceiver and antenna. The DC power line filter helps keep common mode current out of the power line which could cause interference to other devices connected to the same power source.

These chokes use a ferrite core material that is effective in suppressing RFI from transmitters and receivers experiencing a high noise floor in the 1-300 MHz range.

The ferrite split bead filters are easy to use, don’t require modification of the protected equipment and work in almost all cases, even when plug-in filters fail.

Kit Includes 2 noise reduction split bead (they snap on like a clam shell) filters for coax and AC/DC power/ standard 15 Pin connector cable. 3/4" whole ID - just wrap 2-3 turns of coax cable thru 1 bead and 2-3 turns of the DC power/15 Pin cable thru the other split bead. Does not affect signals carried by the cables, only the common mode interference noise is suppressed.

For additional RFI suppression, use a feed line choke at the antenna feed point to suppress common current on the coax feed line during TRANSMIT and a CMNF-500-50 coax noise filter at the radio end of the coax to reduce common mode noise during RECEIVE.

Visit our website for all your RFI needs!

Note: Icom A220 radio shown NOT included in this kit.

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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