AM Broadcast RFI Kits

50:450 ohm (9:1) CUBE™ Balun, 1.8-61 MHz, 1.5 KW, SO-239 UHF Input, BBTD, Traveling Wave Antennas

CB-9-1500TS
$119.95
In stock
1
Product Details
MPN: CB-9-1500TS (top studs), CB-9-1500EB (eyebolts)
Country/Region of Manufacture: USA
Input ohms/Output ohms: 50 in / 450 output
Frequency Range < 2:1 SWR (MHz): 1.8-61
PEP Power Rating (watts): 1500
Input Connector: SO-239
Output Connector(s): Top Studs/Side Eyebolts
Hardware Type: Stainless Steel
Enclosure Size: 4" x 4" x 2"
Weight (pounds): 3
Antenna Compatability: Folded Dipole, T2FD, BBTD, ALE

Model CB-9-1500 is a 9:1 multi-core, balanced output balun housed in a water resistant enclosure with top stud/wingnuts (TS) or Eye bolts (halyard top hoist, side eye bolts/outputs) used to translate a 50 ohm input up to 450 ohms at RF power levels up to 1500 watts PEP when used with a matched load. With matched 450 ohm load the SWR over the frequency range 1.8 to 61 MHz is less than 2:1 on the coax feed side. Actual SWR is under 1.25:1 from 1.8-180 MHz so very useful for 30-150 MHz also - see graphs for specific details

Features

* Wide Frequency Range 1.8-161 MHz, usable to 180 MHz < 1.25:1 into resistive load

* High Power, 1500 watts PEP (up to 61 MHz)

* Convenient side tab mounting feet

Many designs for BBTD antennas using 9:1 baluns at HFLINK.COM

We also have the 9:1 with the built-in 1:1 choke/balun in part# CB-9-1-1500EB


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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