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Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
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Radio propagation software
I know at least three sources or softwares, one of them is free. You may search the web for the following software names: ITSHFBC (IONCAP, ICECAP) PROPMAN WINPROP ... or the following companies or institutions: ITS (Boulder, USA) Rohde & Schwarz (Munich, Germany) Dr. Dambold (?, Germany)...- iroquoix
- Post #2
- Forum: Communication & signal processing engineering
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Day/evening coverage
The sensivity (or noise floor) of a receiver does not express how good it wilbe able to receive a small (wanted)signal in the presence of a much bigger (unwanted) signal which is in the same frequency range. If you make a walk with a friend on the beach during storm and the waves are rolling...- iroquoix
- Post #5
- Forum: Antenna & propagation engineering
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Environmental behavior of carbon fibre material
Dear List members, due to its light weight I think about using carbon fibre tubes in a marine/navy-application in the near arctic region. I suppose that the environmental aspects like iceing, sunlight and salt water may damage this material like it would may happen to glas fibre material. Do you...- iroquoix
- Thread
- Replies: 2
- Forum: Civil/Environmental engineering general discussion
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Day/evening coverage
Relatively low frequencies like mediumwaves (0.5-2MHz) or shortwaves (2-30MHz) are reflected by the ionosphere. This does not happen to waves in the UHF range (>500MHz) under normal circumstances. Your application is a simple line of sight application where you possibly may have reflections by...- iroquoix
- Post #2
- Forum: Antenna & propagation engineering
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Why should the dipole antenna be fed balanced ?
A balanced load wants to be fed by a balanced source, the dipole (balanced load) wants to be fed by a balanced line which has the feed point impedance of the dipole at its end. Otherwise there is a current flowing on the outside of the coaxial shielding braid which is radiated and causes a...- iroquoix
- Post #5
- Forum: Antenna & propagation engineering
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Why should the dipole antenna be fed balanced ?
The direct connection of a dipole to coaxial cable is not a dramatic mistake in many cases but may cause rf flowing along the coaxial outer braid in some cases which is radiated partially and may cause interference to other systems. The diagram is disturbed as well in most cases. Feeding a...- iroquoix
- Post #3
- Forum: Antenna & propagation engineering
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Why should the dipole antenna be fed balanced ?
The direct connection of a dipole to coaxial cable is not a dramatic mistake in many cases but may cause rf flowing along the coaxial outer braid in some cases which is radiated partially and may cause interference to other systems. The diagram is disturbed as well in most cases. Feeding a...- iroquoix
- Post #2
- Forum: Antenna & propagation engineering
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WANTED: equivalent for 2N5160
I want to repair an active shortwave antenna (0.5-30MHz)which has a push-pull driver at its coaxial output stage to drive the cable to the receivers. This driver has a transistor 2N5160 which is a medium power PNP type for rf-purposes. This transistor is blown but this type is discontinued and...- iroquoix
- Thread
- Replies: 4
- Forum: Antenna & propagation engineering
