VHF/UHF Handheld Signal Location Antennas
Type NVF-2
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The Type NVF-2 series of handheld directional antennas
are used to locate interfering signals or noise in either the 420 – 470 MHz
(Type NVF-2A) or the 900 MHz ISM band or cellular telephone bands (Type NVF-2B).
Both models incorporate a solid reflector positioned behind a resonated half
wave driven element, both elements being mounted on a fiberglass rod with an
integral pistol grip. The configuration of the reflector and driven element
are such that a deep null in the signal being received will occur when the antenna
is pointed in the direction of the signal being radiated. A T-pad resistive
attenuator is also incorporated in the antenna mounting enclosure to aid in
the direction finding process on very strong signals or when excessive reflections
present multiple returns.
For this antenna to be effective, it should be used with a spectrum analyzer,
service receiver, or any receiver that incorporates a signal strength display
indicator, such as the conventional S-meter. Although highly effective for locating
interfering signals, the antenna is subject to multi-path transmission phenomenon
(i.e. reflections), repeated observation of the incoming radio signal will be
necessary from different locations in order to sort out the true direction of
the incoming signal from the reflected signals.
TECHNICAL
SPECIFICATIONS
TYPE NVF-2A
Frequency of Operation: Useful Receive Bandwidth: Overall Length: Output Impedance: Attenuation: Null Depth: |
Customer Specified in the 420–470 MHz Spectrum Approx. plus/minus 12 MHz about center frequency 15 Inches (Back of reflector to Connector) 50 Ohms 25 dB T-Pad, switched in or out Typically
15-20 dB min. null depth |
TYPE NVF-2B
Frequency of Operation: Useful Receive Bandwidth: Overall Length: Output Impedance: Attenuation: Null Depth: |
Customer Specified in the 860–960 MHz Spectrum Approx. plus/minus 20 MHz about center frequency 12 Inches (Back of reflector to Connector) 50 Ohms 25 dB T-Pad, switched in or out Typically 15 –20 dB min.
null depth |
NVF-2A/B Price: $139.95
(CA residents add 7 ¾% sales tax)
Shipping/Handling: $7.00
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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