Tube Feed Line Chokes

Hybrid 2:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5/5KW PEP - Loop Antenna

SKU CB-2-1-1500EB
$149.95
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Output Connectors
PEP Power Rating
1
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Hybrid 2:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5/5KW PEP - Loop Antenna
Product Details
MPN: CB-2.25-1-1500/5000EB or TS option
Country/Region of Manufacture: USA
Input ohms/Output ohms: 50 in/112.5 out
Frequency Range < 2:1 SWR (MHz): 1.8-61 MHz
PEP Power Rating (watts): 1.5KW or 5KW
Enclosure Size: 4"x4"x 2"(1.5KW), 6"x6"x4" (5KW)
Weight (pounds): 3 (1.5KW), 5 (5KW)
Antenna Compatability: Single Band Loop

After many requests we have created a compact, special balun for single band loop (Sky loop or Delta loop) antennas. The CB-2-1-1500 is a CUBE(TM) enclosure containing a multi-core, broadband 2:25 impedance transformer (50 ohm coax input to 112.5 ohm balanced output) in series with a 1:1 current balun for extra common mode current choking to keep 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). Rated for full 1500 watts PEP and 450 watts CW (ICAS). 1.8Mhz – 61 MHz.

CB-2-1-1500EB is housed in a 4” x 4” x 2” waterproof housing with SO-239 input and stainless steel eye bolts on the side for ease of connection to your wire antenna. Top eye bolt acts as an antenna hoist. Also available with top studs for post or wall mounting (Model # CB-2-1-1500TS)

Loop antennas should be cut for 1005/F(MHz) in total length, where F (MHz) is the lowest frequency to be used. For 3.5MHz this equates to 288 foot perimeter (square, delta, multi-side ok).

Production Note: These hybrid baluns are special order and made to order for each customer. Please note that shipping will be approximately 2-3 weeks after order placed depending upon our existing production schedule.

TUBE feed line chokes/Line Isolators are used to suppress common mode current carried on the outside of the  coax braid which is often responsible for receiver noise and RFI in the receiver/transmitter. These chokes are very useful for suppressing RFI common mode current at the antenna feed point, at 1/4 wavelength intervals along the coax feed line and also at the entrance to the radio station.  They are available with various input and output connectors so as to conveniently connect to standard output connectors already installed on your feed line.

Palomar Engineers TUBE feed line chokes are designed to have 2-5 times more choking impedance over a broader frequency range than competitor units in similar packaging.  Each choke has the choking impedance and effective frequency range on the product label so you can choose the product best suited for your application.