Off Center Fed (OCF) Dipole Baluns

3567247745 - Off Center Fed (OCF) Dipole Baluns
+3

FLEX PGXL Linear Amplifier RFI Kit - Single/Dual I/O Options

RFI-LA-FLEX-1
$59.95
In stock
1
Product Details
MPN: RFI-LA-FLEX-1 or RFI-LA-FLEX-2
RFI Suppression Range (MHz): 1-100 MHz

PURPOSE

These kits are designed to choke common mode currents going into or exiting from your amplifier cables.Filters are supplied for the RF In, RF Out, Relay Cable/control lines, and AC power line.Use of the filters often helps cure SWR problems between amp exciter and amp and between amp and antenna tuner or direct to antenna.The AC power line choke helps keep common mode current out of the power line which could cause interference to other devices connected to the same power line if not suppressed.

USE

Standard kit for amplifiers with single input, single output, relay keying and AC input

Deluxe Kit for amplifiers with dual inputs/outputs, frequency/keying control lines

KIT INCLUDES

Filter Type

Usage

Standard Kit

Deluxe kit

F240 Ring (1.4” ID)

RF Exciter input

1

2

Snap On (1/2” ID)

Ethernet, PTT control

2

2

Snap On (1” ID)

RF Output

1

2

Snap On (1” ID)

120/240 VAC Input

1

1

Total Filters

5

7

INSTALLATION GUIDELINES

Standard Kit - Part# RFI-LA-FLEX-1

RF Input:Ring Filter (1.4” ID) – 5-9 turns of RG-58/8X size through center

RF Output:Snap On Filter (1” ID) – 3 turns of coax cable through center

PTT Relay Cable:Snap On Filter (1/2” ID) – multiple turns through center

Ethernet Cable:Snap On Filter (1/2” ID) – multiple turns through center

AC Power:Snap On Filter (1” ID) – 3 turns of power cord through center

Deluxe Kit - Part# RFI-LA-FLEX-2

RF Input (2)Ring Filter (1.4” ID) – 5-9 turns of RG-58/8X size through center

RF Output: (2)Snap On Filter (1” ID) – 3 turns of coax cable through center

PTT Relay Cable:Snap On Filter (1/2” ID) – multiple turns through center

Ethernet Cable:Snap On Filter (1/2” ID) – multiple turns through center

AC Power:Snap On Filter (1” ID) – 3 turns of power cord through center

Also make sure you connect a good RF ground to the amplifier ground post.

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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