Top Amateur Radio Websites - Issue 2231
40m center loaded vertical antenna, Coax Dipole for 2 meters band, 20m 30m 40m Bandpass Filters, SteppIR UrbanBeam Review, QTHnow, VA6AM Contesting Accessories, ANjo Antennen
DXZone.com
SatNOGS Satellites List
Operating Modes/Satellites
SatNOGS DB is an effort to create an hollistic, unified, global database for all artificial objects in space (satellites and spacecrafts). You can view and export the data, contribute to it, or even connect your application using API.
SatNOGS DB is an effort to create an hollistic, unified, global database for all artificial objects in space (satellites and spacecrafts). You can view and export the data, contribute to it, or even connect your application using API.
12v Battery Charger
Technical Reference/Batteries/Battery Charger
Well, firstly the 12 Volt source will typically vary anywhere from 11 Volt to 15 Volt, and then a battery needs a controlled charge current and voltage, which cannot result from connecting it directly to a voltage source.
Well, firstly the 12 Volt source will typically vary anywhere from 11 Volt to 15 Volt, and then a battery needs a controlled charge current and voltage, which cannot result from connecting it directly to a voltage source.
PE0SAT Satellite Frequency List
Operating Modes/Satellites
An online reference table with Satellite information including current status, uplink and downlink frequencies.
An online reference table with Satellite information including current status, uplink and downlink frequencies.
6m Amplifier with 2x Gi7b
Technical Reference/Amplifiers/VHF Amplifiers
A 50 MHz stable and small power amplifier, suitable for portable and domestic use. This RF Power amplifier delivers 900W with used pair of tubes primary installed into amplifier.
A 50 MHz stable and small power amplifier, suitable for portable and domestic use. This RF Power amplifier delivers 900W with used pair of tubes primary installed into amplifier.
Vertical Antenna Wavelength Vs Performance
Antennas/Theory/Antenna Gain
This article on basic antenna theory explains why is a 5/8 wavelength vertical antenna better than a 1/4 wavelength antenna
This article on basic antenna theory explains why is a 5/8 wavelength vertical antenna better than a 1/4 wavelength antenna
50Ah LiFePO4 battery
Technical Reference/Batteries
A LiFePO4 battery box build project made with 25Ah 3.2V LiFePO4 prismatic cells, 40A 4s1p BMS with Bluetooth, 10A Buck/Boost converter
A LiFePO4 battery box build project made with 25Ah 3.2V LiFePO4 prismatic cells, 40A 4s1p BMS with Bluetooth, 10A Buck/Boost converter
Top Amateur Radio Websites - Issue 2227
DXCenter DX Cluster, Bandpass Filter Calculator, FT8 Chat, Arduino Flex Controller, Contest Log Analyzer, N3TUQ DX Maps, ICOM IC756 Fan Modification,
Introducing IC-905 first VHF/UHF/SHF Transceiver
Blocking Dynamic Range in Receivers
Technical Reference/Receivers
An explanation of the different procedures and definitions that are commonly used for blocking dynamic range (BDR) measurements. Dynamic range in general is the ratio between the weakest signal a system can handle and the strongest signal the same system can handle simultaneously without an operator switching attenuators or turning volume potentiometers
An explanation of the different procedures and definitions that are commonly used for blocking dynamic range (BDR) measurements. Dynamic range in general is the ratio between the weakest signal a system can handle and the strongest signal the same system can handle simultaneously without an operator switching attenuators or turning volume potentiometers
Satellite Yagi crossed 2m, 70cm
Antennas/Satellite
Construction of an antenna for experimental satellite communication, 8el. (435 Mhz) x 4el. (145 Mhz) Satellite Yagi crossed. No difficulty to built this antenna. Except the gamma match. that requires a little more attention
Construction of an antenna for experimental satellite communication, 8el. (435 Mhz) x 4el. (145 Mhz) Satellite Yagi crossed. No difficulty to built this antenna. Except the gamma match. that requires a little more attention
Top Amateur Radio Websites - Issue 2228
Coax Attenuation Chart, 9:1 Unun Impedance Transformer, An 80 m dipole antenna for restricted spaces, 144 MHz 2m dipole for SOTA, 2m Lightweight Portable Dipole, TNXLOG, Virgo - Meteorscatter app,
Double BiQuad Antenna for 2.6 GHz
Antennas/Microwave
This is basic instructions for homemade 4G Antenna working on 2600 MHz UMTS featuring 13 14 dBi gain. This antenna is desigend to resonate on microwave frequencies in two segments from 2500 to 2570 MHz for Uplink, and from 2620 to 2690 MHz for Downlink.
This is basic instructions for homemade 4G Antenna working on 2600 MHz UMTS featuring 13 14 dBi gain. This antenna is desigend to resonate on microwave frequencies in two segments from 2500 to 2570 MHz for Uplink, and from 2620 to 2690 MHz for Downlink.
Double BiQuad Antenna Calculator
Antennas/Antenna Calculators
Online antenna calculator for homemade double biquad antenna for UMTS 3G 4G WiMAX WiFi frequencies. Article includes also a simple biquad antenna for 4g
Online antenna calculator for homemade double biquad antenna for UMTS 3G 4G WiMAX WiFi frequencies. Article includes also a simple biquad antenna for 4g
Top Amateur Radio Websites - Issue 2229
50 MHz Omnidirectional antenna, Foldable Yagi Antenna, End-fed 6-meter Zepp, Digirig Mobile, How to Make an Automatic 12V Battery Charger, OTRSP Antenna Selector, TNXQSO.com , Z21RU Log Online,
Battery Charger for Hand Held Radio Battery Packs
Technical Reference/Batteries/Battery Charger
This is a handy little charger that can provide a charging current of up to 120 mA continuously for batteries in the range up to 12 volts. The supply is housed in a small plastic enclosure 90 x 55 x 32 mm.
This is a handy little charger that can provide a charging current of up to 120 mA continuously for batteries in the range up to 12 volts. The supply is housed in a small plastic enclosure 90 x 55 x 32 mm.
Digital Mode Interface
Technical Reference/Sound Card Radio Interfacing
The use of an isolation interface between the radio and the pc is higly recommended,in order to avoid the problems that could be caused from ground loops. This project includes schematic and assembly instructions
The use of an isolation interface between the radio and the pc is higly recommended,in order to avoid the problems that could be caused from ground loops. This project includes schematic and assembly instructions
Explaining ARRL Radio Tech Reviews
Radio Equipment/Reviews and Comparisons
Explaining ARRL Technical Reviews of Radios a brief tutorial on radio testing. The ARRL Lab tests radio equipment according to standardized test procedures, using calibrated professional test equipment. Info on transmitter and receiver tests
Explaining ARRL Technical Reviews of Radios a brief tutorial on radio testing. The ARRL Lab tests radio equipment according to standardized test procedures, using calibrated professional test equipment. Info on transmitter and receiver tests
Patented RF choke test
Antennas/Feed Lines/Choke
A reproduction test of a a binocular ferrite core and winds a total of 7 turns is a patented rf choke with an unusual winding, although this winding scheme reduces the inductance, it might result in a much larger bandwidth over which the choke has a sufficiently large impedance. The Author test this model by reproducing the choke.
A reproduction test of a a binocular ferrite core and winds a total of 7 turns is a patented rf choke with an unusual winding, although this winding scheme reduces the inductance, it might result in a much larger bandwidth over which the choke has a sufficiently large impedance. The Author test this model by reproducing the choke.
