AM Broadcast RFI Kits

FLEX TUNER GENIUS RFI Kit - SO2R/3 Antenna Option

SKU RFI-AT-FLEX-TG
$89.95
Ouput RF Ports
1
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FLEX TUNER GENIUS RFI Kit - SO2R/3 Antenna Option
Product Details
MPN: RFI-AT-FLEX-TG or RFI-AT-FLEX-TG3
RFI Suppression Range (MHz): 1-100 MHz

PURPOSE

These kits are designed to choke common mode currents going into or exiting from your Tuner Genius cables. Filters are supplied for the RF Input (s) RF Outputs, DC power and LAN input. The DC 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. The LAN cable choke keeps any RFI off the LAN cable input.

USE

RFI-AT-FLEX-TG Standard kit for tuners with SO2R option and RFI-AT-FLEX-TG3 for tuners with 3 antenna outputs option (1X3).

Note if you use other cables into the tuner such as PTT or otherwise, use FSB31-1/2 snap on ferrites for these lines and wind 2 or more turns thru center if possible. These ferrites sold separately.

KIT INCLUDES

Filter Type

Usage

SO2R Kit

3 Antenna Kit

Snap On (1/2” ID)

DC Power

1

1

Snap On (1/2” ID)

Ethernet/LAN input

1

1

FSB31-1
RF Output
2
3
FSB31-1
RF Input
2
1

Total Filters


6

6

INSTALLATION GUIDELINES

SO2R Kit - Part# RFI-AT-FLEX-TG (2 Inputs, 2 Outputs)

RF Output:Snap On Filter (1” ID) – 3 turns (1/2" cable) or 6 turns (1/4" cable) of coax cable through center for each output - Use 1 for channel A and one for channel B Output

RF Input Snap On (1" ID) - 3 turns (1/2" cable) or 6 turns (1/4" cable) of coax cable through center for each input - Use one for channel A and one for channel B Input

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

DC Power:Snap On Filter (1/2” ID) – 2 or more turns of DC (+ and -) power cord through center

3 Antenna Kit - Part# RFI-AT-FLEX-TG3 (3 Antennas, 1 input)

RF Output:Snap On Filter (1” ID) – 3 turns (1/2" cable) or 6 turns (1/4" cable) of coax cable through center for each output

RF Input Snap On (1" ID) - 3 turns (1/2" cable) or 6 turns (1/4" cable) of coax cable through center for TX input

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

DC Power:Snap On Filter (1/2” ID) – 2 or more turns of DC (+ and -) power cord through center

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


When considering solutions for AM broadcast (550 Khz – 1.8 Mhz) you should consider Mix 77 ferrites available in a variety of shapes and sizes.  Choose a size to give the maximum number of turns of the affected wire or cable.

AM broadcast transmits on a low frequency with large antennas.  Consequently it takes a large antenna to receive the signals.  Typical “antennas” are AC house wiring, phone lines, long satellite or cable TV cables, DSL/CAT5 lines running between rooms, etc.  The device wires that connect to these  “antennas” need to be choked with as many turns through the ferrite as possible.  Some installation examples are shown below on this page.

For AC/ DC power cords and coax cables the F240-77 (2.4″ OD, 1.4″ ID) “Donut” toroid is the most popular.  Also available are smaller toroid donuts and Mix 77 beads. Shown below is a graph with 8, 10, and 12 turns through the toroid – obviously more turns has higher choking impedance.  Mix 77 toroid products are HERE and Mix 77 small beads (for small wires) are HERE

F240 77 Turns Comparison 1024x648 - AM Broadcast RFI Kits

F240-77 Turns Comparison from .1 – 8.1 Mhz

Shown below is a graph of frequency response verses choking magnitude for a F240-77 in the AM Broadcast band for a 12 turn coil around the toroid. (Same info as above but different frequency range).

AM Band Choking Graph F240 77 1024x648 - AM Broadcast RFI Kits

F240-77 Choking Impedance in AM Broadcast Band

 

 

Typical Installations for Donut/Ring Toroids

20131210 114716 150x150 - AM Broadcast RFI Kits

AC Cable on F-240 Toroid – 6 turns

20131210 115137 150x150 - AM Broadcast RFI Kits

Ethernet Cable on F-240 Toroid – 7 turns

20131222 125533 150x150 - AM Broadcast RFI Kits

Audio or Mic cable on F240- 12 turns

 

 Extra Mix 75 Snap On Beads  HERE – VERY effective for AM Broadcast RFI