net frequencies
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Antennas : Fan Dipole- Fan Dipoles 10/15/20m and 12/17/30m
- How to build Fan-Dipoles by DK7ZB. Experiences with various band combinations. Not all combinations are working properly. If the frequencies are to close together the impedances will lead to a very bad SWR. This happens with the bands 10-12-15m or 15-17-20m.
[ Hits: 488 | Votes: 2 | Rating: 9.5 ]
- XW4DX LAOS DXPedition
- XW4DX DXpedition to Laos 16 to 27 November 2023 We will be operating on all HF Frequencies except 80m and 30m, that are unfortunately not allowed anymore in Laos.
[ Hits: 12 | Votes: 0 | Rating: 0 ]
- Radio Scout Frequencies
- Information on frequencies suggested as Scout amateur radio frequencies. These were initially suggested by the World Organization of the Scout Movement and their Jamboree on the Air organizer. As with all amateur radio frequencies they are a shared resource. If someone else is already on that frequency, move up or down to find a clear frequency for calling.
[ Hits: 45 | Votes: 0 | Rating: 0 ]
- Sounds of Meteors
- Sound recordings of meteors and things reflecting TV station video carriers , frequencies used are analog TV video carrier frequencies offset by 1 kHz SSB
[ Hits: 338 | Votes: 1 | Rating: 1 ]
- NVIS: Near Vertical Incidence Skywave
- Operating NVIS mode, understanding operation frequencies, choosing the proper antenna to operate with the Near Vertical Incidence Skywave propagation
[ Hits: 385 | Votes: 6 | Rating: 5.58 ]
- Using a Baofeng handheld to work Satellites
- How to program Baofeng handheld transceiver with satellite frequencies, and how to get alerts when satellites are visible by using a smartphone app. A beginners guide to work satellites with a common VHF handheld radio.
[ Hits: 545 | Votes: 5 | Rating: 8.2 ]
- Major World Air Route Areas Frequencies
- MWARA list of major world air route areas frequencies. A wide network of HF Frequencies has been allocated to provide voice communications between aircrews and ATC.
[ Hits: 755 | Votes: 3 | Rating: 7 ]
- Monitoring The Airwaves During Ukrainian Conflict
- This article reports and collect some frequencies used during 2020 Ukraine war and reported as being used by army forces. HF communications are still a crucial part of military communications and can ben monitored on web sdr radios available on the internet.
[ Hits: 530 | Votes: 3 | Rating: 9.67 ]
- UK Scanner Frequencies
- UK frequency list provide reference table to lister to Police scanner channels UHF VHF, Amateur Repeaters, Ambulance CB Radio CoastGuard Rescue, marine VHF, Military and more.
[ Hits: 163 | Votes: 1 | Rating: 1 ]
- Pittsburgh Area Aviation Frequencies
- A Western Pennsylvania Radio Guide
[ Hits: 194 | Votes: 0 | Rating: 0 ]
- Hamilton county police scanner frequencies
- Scanner Frequencies for Chattanooga / Hamilton County. Chattanooga Police Talkgroups, Chattanooga Fire / Rescue Talkgroups, Chattanooga City Services Talkgroups, police, Hamilton County Sheriff Talkgroups
[ Hits: 27 | Votes: 0 | Rating: 0 ]
- FT CALC 1.3 - Ferrite Toroidal Core HF Calculator
- This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included.
The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
[ Hits: 283 | Votes: 1 | Rating: 2 ]
- VHF-UHF Diplexer
- Diplexer is a passive device, a special filter circuit that seperates 2 different bands, not to be confused with the duplexer that usually separate 2 different frequencies on the same band.
[ Hits: 1140 | Votes: 2 | Rating: 5 ]
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