C 1 C revised 12/4/13 product description the hdp series is a compact, center-fed antenna that achieves effcient operation at any or all three frequency bands. its durable, unobtrusive housing attaches permanently with integral adhesive to fat, non-conductive surfaces such as windows, drywall, ceiling tiles, plastic, etc. the antenna is supplied with 9.8 feet (3 m) of rg-174 cable and can be terminated in a tnc, standard sma or fcc part 15 compliant rp-sma connector. features ? tri-band (824C960mhz, 1.71C1.99ghz and 2.401C2.483ghz) ? center-fed from the side ? surface-mount ? low vswr ? excellent performance ? omni-directional pattern ? fully weatherized, durable & unobtrusive ? tnc, sma or rp-sma connector electrical specifcations recm. freq. range: band 1: 824C960mhz band 2: 1.71C1.99ghz band 3: 2.40C2.48ghz wavelength: ?-wave vswr: band 1: 1.5 typ. at center band 2: 1.9 typ. at center band 3: 1.9 typ. at center peak gain: band 1: 0.2dbi band 2: C3.3dbi band 3: 0dbi impedance: 50-ohms connector: tnc, sma or rp-sma cable: 9.8' (3 m) rg-174 coax oper. temp. range: C40c to +80c ant-db1-hdp-xxx data sheet by ordering information ant-db1-hdp-tnc (with tnc connector) ant-db1-hdp-sma (with sma connector) ant-db1-hdp-rps (with rps connector) 132.3 mm (5.23") tnc connector sma, rp-sma connector 12.1 mm (0.48") 20.0 mm (0.79") 14.0 mm (0.55") 7.9 mm (0.31")
C 2 C by data sheet ant-db1-hdp-xxx vswr graph what is vswr? the voltage standing wave ratio (vswr) is a measurement of how well an antenna is matched to a source impedance, typically 50-ohms. it is calculated by measuring the voltage wave that is headed toward the load versus the voltage wave that is refected back from the load. a perfect match will have a vswr of 1:1. the higher the frst number, the worse the match, and the more ineffcient the system. since a perfect match cannot ever be obtained, some benchmark for performance needs to be set. in the case of antenna vswr, this is usually 2:1. at this point, 88.9% of the energy sent to the antenna by the transmitter is radiated into free space and 11.1% is either refected back into the source or lost as heat on the structure of the antenna. in the other direction, 88.9% of the energy recovered by the antenna is transferred into the receiver. as a side note, since the :1 is always implied, many data sheets will remove it and just display the frst number. how to read a vswr graph vswr is usually displayed graphically versus frequency. the lowest point on the graph is the antennas operational center frequency. in most cases, this will be different than the designed center frequency due to fabrication tolerances. the vswr at that point denotes how close to 50-ohms the antenna gets. linx specifes the recommended bandwidth as the range where the typical antenna vswr is less than 2:1. 159 ort lane, merlin, or, us 97532 phone: +1 541 471 6256 fax: +1 541 471 6251 www.linxtechnologies.com v swr reflected power 3:1 2:1 1:1 25% 11% 0% center 910.000mhz center 1 825.000mhz span 200.000mhz center 2 450.000mhz 1.438 1.228 1.282
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