MODEL TRX-9
9:1 Receive Antenna Transformer

Low Loss  •  Accurate Impedance Transformation  •  Surge-Protected  •  Rugged Construction  •  Handles Accidental Transmit Power

The AY Technologies TRX-9 Receive Antenna Transformer is built with the best components and materials: SO-239 coax connector, large-size ferrite cores, gas tube surge protector, metal-to-metal contact binding posts and a rugged PVC enclosure. The 9:1 impedance ratio is ideal for Beverages, K9AY loops and other antennas with feedpoint impedances in the 300-1000 ohm range (see specifications below). Separate primary and secondary windings allow 180-degree phasing for easy implementation of inline or staggered phased arrays.

Specifications
Impedance transformation: 9:1 (output vs. input impedance)
50 ohm system: 450 ohm optimum load impedance 300-675 ohms with 1.5:1 VSWR
75 ohm system: 675 ohm optimum load impedance
450-1000 ohms with 1.5:1 VSWR
Bandwidth: Optimized for 1.8-7.3 MHz, usable 1 MHz-25 MHz
Loss: 0.25 dB typical
Antenna connection: Red/Black color-coded binding posts
Coax connection: SO-239, with body connected to mounting flange
Surge protection: Gas tube spark gap, 75-volt breakover, 1 pF capacitance

Circuit Diagram

Instructions
For a typical Beverage installation, connect the antenna to the Red binding posts, and the ground connection to both the Black binding post and mounting bracket. Connect either 50-ohm or 75-ohm coaxial feedline to the SO-239 connector. For phased arrays, 180-degree phasing can be accomplished by reversing the Red and Black connections. If you want an isolated feedline, do not ground the mounting bracket; just ground one of the binding post connections. Always be sure that one of the binding post connections is grounded - the surge protector will not function without grounding! For additional technical information, click on the TECH NOTES button.

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AY Technologies * antennas by K9AY * www.aytechnologies.com