Off Center Fed (OCF) Dipole Baluns

3204621037 - Off Center Fed (OCF) Dipole Baluns
+3

Inverted L End Fed Antenna System with Coax Interface including 1:1 feed line choke - 160/80M and 1.5KW/5KW PEP options

PAL-INVL80-1500
$149.95
In stock
1
Product Details
MPN: PAL-INVL80-1500/5000 or PAL-INVL160-1500/5000
Country/Region of Manufacture: USA
Input Connector: SO-239
Output Connector(s): Eyebolts/Wing Nut
Hardware Type: Stainless Steel
Enclosure Size: 4"x4"x 2"(1.5KW), 6"x 6" x 4"(5KW)

Inverted L antenna with radiator and counterpoise for simple installation - choose 80/160 meters and 1.5KW/5KW feed line choke included inside weatherproof enclosure. Separate counterpoise and ground connections

* Complete package - just add coax

* works single band with ease

* can be configured as vertical or inverted L configuration

* Choice of 1.5K, or 5KW PEP rated choke to suit power needs

After many requests we have created a compact, special interface box with internal feed line choke and separate connections for counterpoises (not grounded) and ground connection. The 1:1 choke keeps RF current off the outside of the coax braid and on the antenna where it belongs. The extra choking action also means that the coax feed line will not act as a radiator causing unnecessary RF interference (RFI).

80 M radiator/counterpoise is 70 Feet (you get 1 each) - adjust length to your favorite frequency

160 M radiator/counterpoise is 130 Feet (you get 1 each) - adjust length to your favorite frequency

Antenna is tuned to you favorite frequency by shortening the counterpoise (roll it up or cur length) while keeping the radiator length constant.

Choose 1,5KW PEP or 5KW PEP options.

1.5KW and 5KW are in 4" x 4" x 2" enclosure. 1.5KW is 3 pounds, 5KW is 5 pounds. 2 antenna insulators are included.

ADD CMNF-1500 (1.5KW) or CMNF-5000 (5KW) common mode noise filter at radio end of coax to reduce common mode noise up to 6 "S" units on long coax runs!

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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