VSWR Plots Pg 3 - Antennas
DATASHEETUC-3004-381Mini UHF SATCOM Antenna, X-WingUHF SATCOM Antenna model UC-3004-381 is a lightweight, tactical,compact Turnstile/X-Wing antenna system. The polarization of this antenna isCircular (CP), intended for communications via MUOS satellites(DAMA/IW/WCDMA). This antenna is approximately half the size of anormal X-Wing antenna. However, it offers comparable gain to its full sizecounterpart. Its half size dimensions make it ideal for tactical applications,where low observability is important. It will also serve to spoof opposingforces and intelligence efforts. They will be believing traffic through theantenna is occurring at much higher frequencies, due to its small size.X-Wing Polarization NoteSATCOM Antenna Design Modularity andImplementation PhilosophyThe design of this Mini UHF X-Wing Antenna is modular. This enables you to use one antenna in multipleways. For example, mount it on a vehicle, using the High Gain Mount, ACC-0005 and either a magnet(ACC-0003) or a suction cup (ACC-0002). For a more permanent installation, use the standard X-Wing boltmount (ACC-0008, compatible with AV 2090, 4 hole pattern). After reaching your target area and dismountthe vehicle, you may remove the antenna (with or without the High Gain Mount). Then, attach it to yourradio with a Coaxial Cable Assembly for portable use (see website for more cable choices). Note: for alighter, less observable version of this antenna, which fits in a 4" (10 cm) x 4" (10 cm) pouch(see UC-3004-481 Tacsat Antenna).Contact us for further information about the UC-3004-381 Antenna. This includes additional capabilities,expanded features and customized variants, which are available per special request. Call us to discuss yourrequirements at 954-345-5000. Alternatively, email us at sales@antennas.usantennas.usa Sales division of Myers Engineering International, Inc5425 NW 24th Street #201 Margate, Florida 33063 954-345-5005
DATASHEETUC-3004-381 Technical Specifications Operating Frequencies: Original models, UC-3004-381R/RE/RF: 243-318 MHz Rev A models, UC-3004-381AR/ARE/ARF: 243-380 MHz (useable 225-400 MHz) Polarization: Circular (CP) [models -381R are RHCP] Axial Ratio: 2 dB Maximum Power: 50 Watts CW (Continuous operation) Gain (peak): Mini (basic) version, directly mounted on connector: -4 dBic Mini (basic) version, on High Gain mount ACC-0005, 1 dBic*Elevation pattern (Basic version) "E" (Extended) version, directly mounted on connector: 0 dBic "E" (Extended) version, on High Gain mount ACC-0005, 4 dBic*Elevation pattern (Extended version) "F" (Full) version, directly mounted on connector: 2 dBic "F" (Full) version, on High Gain mount ACC-0005, 6 dBic*Elevation pattern (Full version) Azimuthal Coverage: Omnidirectional Nominal Impedance: 50 Ohms (RF), short circuit (DC) Maximum VSWR: 3.0 (under 2.5 typical)VSWR Plots: UC-3004-381R (Basic) - Rev A: UC-3004-381AR (Basic) UC-3004-381RE (Extended) - Rev A: UC-3004-381ARE (Extended) UC-3004-381RF (Full) - Rev A: UC-3004-381ARF (Full) Connector Interface: Type N, female Operating Temperature: -40C to 85C (-40F to 185F) Dimensions: Mini (basic) version: 17 cm (6.5 in) x 17 cm (6.5 in) x 2 cm (3/4 in), not including connector23 cm (9 in) tip-tip, can fit in a 18 cm x 18 cm (7 in x 7 in) pouch (not supplied) "E" (Extended) version: 23 cm (9 in) x 23 cm (9 in) x 2 cm (3/4 in), not including connector30 cm (12 in) tip-tip, can fit in a 25 cm x 25 cm (10 in x 10 in) pouch (not supplied) "F" (Full) version: 36 cm (14 in) x 36 cm (14 in) x 2 cm (3/4 in), not including connector48 cm (19 in) tip-tip, can fit in a 38 cm x 38 cm (15 in x 15 in) pouch (not supplied) Weight: 0.5 kg (1 lbs)NOTES: Mounted on a metallic surfaceantennas.usa Sales division of Myers Engineering International, Inc5425 NW 24th Street #201 Margate, Florida 33063 954-345-5005
DATASHEETUC-3004-381 Additional InformationThis product is compatible with the following Accessories: 12 cm (5") Magnetic Base 7 cm (3") Magnetic Base 9 cm (3.5") Suction CupRecommended Cable Assemblies LMR240 - use for cables longer than 3 meters (10 ft) LMR195 - use for cables shorter than 3 meters (10 ft)Specify desired length from drop-down menuSpecify desired connector for the radio end: (usually Type N, TNC or BNC Male)AN/PRC-152TNC Male ConnectorAN/PRC-117BNC Male ConnectorAN/PRC-148(MBITR)TNC Male ConnectorLST-5Type N MaleAN/PSC-5BNC Male ConnectorAN/PRC-119BNC Male ConnectorAN/PRC-139TNC Male ConnectorAN/PRC-113BNC Male Connectorantennas.usa Sales division of Myers Engineering International, Inc5425 NW 24th Street #201 Margate, Florida 33063 954-345-5005
DATASHEETantennas.usa Sales division of Myers Engineering International, Inc5425 NW 24th Street #201 Margate, Florida 33063 954-345-5005
DATASHEETantennas.usa Sales division of Myers Engineering International, Inc5425 NW 24th Street #201 Margate, Florida 33063 954-345-5005
DATASHEETVSWR Plot for Basic VersionUC-3004-381RVSWR Plot for Basic Version Revision AUC-3004-381ARantennas.usa Sales division of Myers Engineering International, Inc5425 NW 24th Street #201 Margate, Florida 33063 954-345-5005
DATASHEETVSWR Plot for Extended VersionUC-3004-381REVSWR Plot for Extended Version Revision AUC-3004-381AREantennas.usa Sales division of Myers Engineering International, Inc5425 NW 24th Street #201 Margate, Florida 33063 954-345-5005
DATASHEETVSWR Plot for Full VersionUC-3004-381RFVSWR Plot for Full Version Revision AUC-3004-381ARFantennas.usa Sales division of Myers Engineering International, Inc5425 NW 24th Street #201 Margate, Florida 33063 954-345-5005
AN/PRC-148 (MBITR)TNC Male Connector LST-5 Type N Male AN/PSC-5 BNC Male Connector AN/PRC-119 BNC Male Connector AN/PRC-139 TNC Male Connector AN/PRC-113 BNC Male Connector. DATASHEET antennas.us
VSWR at the Input of a Lossy Line Because of the losses in a transmission line,! the measured VSWR at the input of the line is! less than the VSWR measured at the load end of ! the line. VSWR Input a ρ a ρ Example 250 feet of RG-8X @ 30 MHz (ML 2.0 dB x 2.5 5.0 dB) with a VSWR at the load of 6:1 ρ 0.71 a 3.16 VSWR Input 1.58
Antenna Noise Bridge from Palomar, MFJ, or from plans in the ARRL Handbook Spectrum analyzer with a tracking generator and an external directional coupler or RF bridge . MFJ-269t. MFJ-202Bt. 23. Measuring VSWR. Directional Couplers RF Bridges. 24. Measuring VSWR. VSWR can be measured using a VSWR meter or directional watt
VSWR mobilefish.com In an ideal situation when no power is reflected back, (Z L Z S) the VSWR 1.0 or as commonly expressed as a ratio of 1:1. The higher the impedance mismatch, the higher the VSWR value. If Z S Z L than power is reflected back, for example VSWR 1.4 or 1.4:1. An antenna with a VSWR 1.4 is considered to be an excellent .
The VSWR can be used to judge the quality of impedance matching for cables and other passive devices. It is also mainly used to determine the efficiency of antennas to radiate power. A perfectly matched antenna/cable system will have a VSWR 1. In reality, VSWR's are typically in the 1.1 to 1.2 range.
of your transmit signal going to the antenna and the amount of signal reflected back by the antenna. A VSWR meter measure P out, P reflected and VSWR. How are there related ? The best VSWR is 1:1. This means that 100% of the signal is going to the load (0% reflected) At VSWR 2:1, 11% of the power is reflected
VSWR Measurement in 75 Systems Using the R&S FSH3-TV TV Analyzer Application Note The voltage standing wave ratio (VSWR) is one of the parameters in RF systems that measures the impedance mismatch. Under ideal conditions, when the load is perfectly matched to the source, the VSWR will be 1. A mismatch in the system causes reflections that will .
to 100 ohm, the VSWR is equal to 2 as shown by simula- tion at . Figure 2(b), and for a load 200 ohm the VSWR goes to 4. This confirms that when the load changes and it differs from the line's characteristic impedance . Z. 0, VSWR also changes because of reflected waves [7,8]. The second scenario, as in . Figure 3, considers a gate-
Antennas can be classified according to their radiation characteristics as follows: (1) omni-directional antennas, (2) pencil-beam antennas, (3) fanned-beam antennas, and (4) shaped-beam antennas. The first type of antenra will be discussed in detail in this article. The physical limitations of pencil-beam antennas will
