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Antennas : Feed Lines- SWR: Maximum allowable VSWR
- VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools
[ Hits: 1239 | Votes: 3 | Rating: 3.33 ]
- Setting the SWR of Your Antenna
- SWR (standing wave ratio), is a measurement of how efficiently your antenna system will radiate the power available from your radio. In simple terms, your radio would like to radiate all of its power, but can only do so if the other components cooperate
[ Hits: 1253 | Votes: 0 | Rating: 0 ]
- The Lindenblad Antenna: The Ultimate Satellite Omni Directional Aerial
- This Antenna project is a bit more complex than other omni antennas for satellite use, but it is much easier and cheaper than a standard tower mounted circular polarized azimuth and elevation rotating beam system.
[ Hits: 442 | Votes: 5 | Rating: 6.8 ]
- Understanding Standing Wave Ratios SWR
- We worry a lot about Standing Wave Ratio (SWR) in amateur radio since SWR is one indication of how well our antenna system is working. Most HF transceivers and antenna tuners have built in SWR meters. SWR is a measure of a transceiver'
s output power verses the portion of that power reflected by the antenna system
[ Hits: 8718 | Votes: 8 | Rating: 4.75 ]
- Malaysia Surge Protection
- Global Lightning Technology - Malaysia lightning Malaysia surge protection system
[ Hits: 1100 | Votes: 1 | Rating: 10 ]
- The One Man Tower
- Complete tower system incorporates rotator mount, and lateral support collars. You never have to climb again - and forget the hassle of tilting over to work on large arrays. The "One Man Tower" is the strongest dmall footprint free standing self erecting tower in the world
[ Hits: 6788 | Votes: 23 | Rating: 9.48 ]
- The Brookdale ATV Repeater System
- Provide an ATV repeater function for the North Jersey Exterior Area that is available not only for general amateur radio use, but also for providing a unique communications resource during emergencies as well (FCC Part 97.1 (a))
[ Hits: 564 | Votes: 0 | Rating: 0 ]
- IRC D-STAR
- Independent Radio Club's D-STAR repeater system
[ Hits: 284 | Votes: 1 | Rating: 2 ]
- Antenna Noise and Signal Cancelling at LF
- The fact that the phasing between a wanted signal and an unwanted signal can be different on different antennas is put to advantage. With this condition, the unwanted signal can be cancelled out by controlling amplitude and phase. The heart of the system is some form of phase control circuitry.
[ Hits: 628 | Votes: 0 | Rating: 0 ]
- Transmitter hunting, in San Francisco
- Amateur radio direction finding, transmitter hunting. triangulating a radio signal direction and plotting its bearing on a map. hunters use doppler systems for tracking hidden transmitters
[ Hits: 497 | Votes: 0 | Rating: 0 ]
- HF Antennas for restricted space
- Arrl document about invisible antennas and indoor systems. It is important to consider that few compromise antennas are capable of delivering the performance one can expect from the full-size variety. But the patient and skillful operator can often do as well as some fellows who are equipped with high power and full-size antennas. The "cliff-dweller" may not be able to "bore a hole" in the band as often, and as easily, but DX can be worked successfully when band conditions are suitable.
[ Hits: 9198 | Votes: 7 | Rating: 5.28 ]
- Pascall Electronics
- Pascall's specialist RF & Microwave division specialise in components for radar, EW receivers, navigation & location equipment, communication and marine safety systems.
[ Hits: 603 | Votes: 0 | Rating: 0 ]
- QSL Card Trac
- A new way to display your QSL cards,you can display your Cards with a wall mounted, easy to use track system.
[ Hits: 779 | Votes: 5 | Rating: 9.8 ]
- Win APRS
- Automatic Position Reporting System windows program, allow monitoring of real time geographical information such as the position of vehicles, the status of weather, radio direction finding and more.
[ Hits: 21391 | Votes: 26 | Rating: 5.38 ]
- CQiNet, linking Ham Radio
- CQiNet is a family of programs that combine Ham Radio with the Internet using Voice over IP (VoIP) technology. Two programs are currently in the family, "theBridge" and echoLinux.
Thebridge is a iLink/EchoLink compatable conference bridge that runs under various versions of Unix as well as Windows.
EchoLinux is a EchoLink client program for the Linux operating system.
[ Hits: 3661 | Votes: 4 | Rating: 7.5 ]
- eQSLMaster
- eQSLMaster is a HAM radio program, that allow to perform various functions using the Electronic QSL Card Centre (eQSL.cc).
With eQSLMaster users of the eQSL.cc system have the ability to upload an entire ADIF format log file (or single QSO) and have it deposited into eQSL central database using LogServices.
[ Hits: 3965 | Votes: 5 | Rating: 5.6 ]
- Predict
- Satellite Tracking/Orbital Prediction Program an open-source, multi-user satellite tracking and orbital prediction program written under the Linux operating system by John A. Magliacane, KD2BD. PREDICT is free software
[ Hits: 2399 | Votes: 4 | Rating: 8.25 ]
- Gpredict
- Gpredict is a satellite tracking program for Unix-like operating systems. In the begining (v. 0.1.x) Gpredict was just a GUI client to John Magliacane's excellent satellite tracking program, Predict, but due to performance problems it has been decided to include the tracking code directly into Gnome Predict (v. 0.2.0 and later).
[ Hits: 3566 | Votes: 8 | Rating: 9.25 ]
- TrackingSat
- Wayana software has a commercial and freeware version of trackingsat, satellite tracking systems.
[ Hits: 1683 | Votes: 10 | Rating: 8.3 ]
- Antenna elevator system for amateur satellites
- Smart homebrew antenna-ELEVATOR system with linear actuator. The actuator is a cheap and heavy tool with high enough torque, ideal for elevation systems, but in practice it needs quite an effort in order to operate correctly in your homebrew antenna system. This page inform you of the actuator's secrets.
[ Hits: 22318 | Votes: 44 | Rating: 7.66 ]
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