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Application Area:EM Transducers Radiated (300's)Product Area:HF-VHF AntennasFrequency Range:20MHz-300MHz - Cage dependentTuning:Partially by cage selectionInterface:N(f)Other:50 Watts inputEMC Item No:338Price:(Pricing depends on length of hire, distance, urgency and the size of the overall order. Please add your items to the request, and we'll email a quote back to you within 3 working hours.)
A generic bicon balun working over the prescribed range & power handling. This balun has been modified to accept a range of 3 smaller cages to address specific requirements for NSA using the RSM procedure but more importantly as a transmitter in shielding tests where space is seriously hampered, e.g. within vehicles. Essentially it can be ordered with one or more of three cage sizes . Photo to right shows the EM-6912A balun with the middle size BC-M (Biconical Cage-Middle) attached. All sizes appear in the specific cage photo namely, BC-S; BC-M and BC-L.
Dimensions of cages to balun are:-
BC-S: 53cm (tip to tip). Diameter: 18cm
BC-M: 67cm Diameter: 25cm
BC-L: 88cm Diameter: 36.5cm
The standard biconical has a tip to tip of 1.3m with a diameter of 52cm. At the lowest frequency of operation ( 30MHz) the smallest cage is about 8-10 dB down on a standard cage but as the frequency rises toward the 300MHz end the difference becomes minimal. However, the useful range with the smallest cage is toward the 1 GigaHertz end. The disadvantage is in the linearity of gain over the range. However, if spot frequencies are chosen where shielding is concerned, prudent selection of frequencies can ensure an adequate dynamic range with just 50 watt feeding the balun.
