TYPE HFDF VECTOR-GUN HANDHELD DIRECTION FINDING ANTENNA SYSTEM

 

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National RF's Type HFDF active directional antenna system consists of a high gain RF amplifier coupled to a tunable Faraday shielded loop antenna. Several loop antenna assemblies are available to provide coverage of frequencies in the HF and low VHF spectrum. Due to the nature of a Faraday shielded loop, the antenna exhibits a sharp null through the diametric center of the loop. This null is used to determine the direction of incoming radio signals or to locate electrical noise being radiated from some source. The internal high gain amplifier is used to compensate for the inherent inefficiency of the actual loop at the operating frequency. Overall, the system dynamic response is about +6 dB as compared to the dynamic response of a dipole. To aid in the direction finding process on strong signals, an internal 30 DB attenuator is provided. As the loop antenna presents a bi-directional response, tri-angulation may be required to eliminate the ambiguous signal direction. The line of site of the incoming signal is determined by listening for a signal null on the receiver or by watching the receiver’s S-meter.

 

The loop elements are mounted on a metallic enclosure with an oil-filled compass attached and a pistol grip for ease of operation. A single 9-volt battery is required for operation.. The battery and the HF receiver are the responsibility of the customer to provide.

 

 

TECHNICAL SPECIFICATIONS

 

Antenna Type: Amplified Faraday shielded loop with bi-directional, cardiodal pattern response

Dynamic Response: Approx. +6 dB compared to a dipole, amplified response

Frequency Range: Loop A; 8-12 MHz. Loop B; 10-20

Loop C; 15-30 MHz. Loop D; 30-50 MHz

Output Impdance: 50 to 1000 ohms

Output Connector: Female, BNC

Attenuator: Switchable Pi pad, 50 ohms

input/output impedance

Enclosrue Size: 6 ½ L X 2W X 1 ½ H,

Overall Height: 8 Inches from bottom of

handle to compass top,

loops not installed

Power: Single 9-volt battery, alkaline

recommended

 

Price:

Type HFDF with one loop element                   -$169.95

Each additional loop element                         -$24.50

Tupe HFDF with all four loop elements            - $239.95

CA residents add sales tax, shipping            - $5.00


Overseas Customers: Please note that an additional overseas shipping charge will be applied to your order. National RF will notify you of the exact amount of shipping to your country via e-mail, after your e-order is placed. The customer is responsible for all and any customs or tarrif charges applied to your order.


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