frequencies

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frequencies

215 links - and 6 categories

Antennas : 2M
  • Make your own 2 metre 5/8 whip antenna - This article is about a home made project of a whip antenna for 2 meters band. Includes lenght of whip for all frequencies from 140 MHz to 151 MHz both in mm and inches
    [ Hits: 384 | Votes: 1 | Rating: 5 ]
Antennas : Quadrifilar Helix
  • NOAA Satellite Reception with QFH Antenna - How to receive NOAA weather satellite with a home made QFH Antenna. This project includes some easy and efficient notch filters to suppress noise from FM frequencies
    [ Hits: 257 | Votes: 1 | Rating: 8 ]
Antennas : Wire
  • Long Wire Antenna for portable operations - With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna. Experiments to date seem to have raised more questions than obvious answers.
    [ Hits: 796 | Votes: 13 | Rating: 8.69 ]
DX Resources : DX Peditions : 2020 DXpeditions
  • W8S Swains DX Pedition 2020 - W8S Official web site of the Swains Island March 2020. Information about the Team, plans, frequencies and info on the Swains island
    [ Hits: 384 | Votes: 1 | Rating: 10 ]
Internet and Radio : Sounds
  • 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: 337 | Votes: 1 | Rating: 1 ]
Operating Modes : Microwave
  • Amateur Radio Microwave - Introduction - Introdcution to Amateur Radio Microwave. A 21 page presentation of ham radio microwaves concepts for beginners. Frequencies, modes and activities. How to get started, what equipment is needed and some pictures of ham radio microwave station setups
    [ Hits: 407 | Votes: 0 | Rating: 0 ]
Operating Modes : NVIS
  • Near vertical incidence skywave - wikipedia - The wikipedia article about NVIS Near vertical incidence skywave with information about usable frequencies and some general information on main NVIS oeprations usages
    [ Hits: 288 | Votes: 0 | Rating: 0 ]
  • 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: 383 | Votes: 6 | Rating: 5.58 ]
Operating Modes : Satellites
  • 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: 544 | Votes: 5 | Rating: 8.2 ]
Propagation : Resources
  • What is Radio Propagation - RF propagation - Discover the key facts about what radio propagation is, the different types available and how they affect different frequencies.
    [ Hits: 198 | Votes: 1 | Rating: 10 ]
Radio Equipment : VHF-UHF Mobile : ICOM IC-2100H
  • Programming Icom IC-2100H - Six Steps for Programming your IC-2100H from the front panel of radio. Using these steps you should have no trouble entering either simplex or repeater frequencies and saving them.
    [ Hits: 320 | Votes: 1 | Rating: 3 ]
Radio Scanning : Regional : USA
  • Scanning CNY - An on-line resource with up-to-date scanner frequencies for wentral and Upstate New York requires memberiship subscription
    [ Hits: 200 | Votes: 1 | Rating: 10 ]
  • Scanning the Top of Utah - Scanning the Top of Utah – Reband Update, Trunk Scanning – Channels & Talk Groups , Conventional Scanning - Frequencies, Scanning Aids
    [ Hits: 201 | Votes: 1 | Rating: 5 ]
Radio Scanning : Scanner Frequencies
  • Wellington Scanner Frequencies - New Zealand - Wellington Scanner Frequencies (NZ) Webpage with scanner frequencies for Wellington and the surrounding regions. Police frequencies are now digital in Wellington. Happy Scanning - WSF
    [ Hits: 262 | Votes: 1 | Rating: 1 ]
Software : Circuit Design
  • 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 ]
Technical Reference : Duplexers
  • 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: 1136 | Votes: 2 | Rating: 5 ]
Technical Reference : Programming Radio
  • Programming a Baofeng UV-5R for PMR446 - Nice feature of the Baofeng UV5R family is that they support 6.25kHz tuning steps. That fact makes it possible to dial in the radio to use the exact PMR446 channel frequencies rather than a nearest fit which is the case in many other transceivers.
    [ Hits: 694 | Votes: 8 | Rating: 3.88 ]
Technical Reference : RF Design
  • Introduction to RF & Wireless Communications Systems - This tutorial covers an introduction to RF, wireless, and high-frequency signals and systems, includes explaination of what is RF, why operate at Higher Frequencies, Frequency Shifting through Frequency Mixing.
    [ Hits: 281 | Votes: 1 | Rating: 6 ]
Technical Reference : Raspberry Pi
  • rpitx Multimode TX for Raspberry Pi - rpitx is a general radio frequency transmitter for Raspberry Pi which doesn't require any other hardware unless filter to avoid intererence. It can handle frequencies from 5 KHz up to 1500 MHz.
    [ Hits: 278 | Votes: 0 | Rating: 0 ]
  • WSPR monitoring with RTL-SDR and Raspberry Pi - The goal of this interesting project is to monitor a particular set of frequencies for a set period of time. In this article your will find instructions to build and operate an all-band WSPR node using cheap hardware and free software. At the end of this you'll have a Raspberry Pi, connected to an RTL-SDR dongle that monitors all of the WSPR frequencies rotating randomly every 15 minutes.
    [ Hits: 201 | Votes: 0 | Rating: 0 ]

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