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kb6nu.com
kb6nu.com
2020
24 Apr 2020
21 Apr 2020
20 Apr 2020
14 Apr 2020
14 Apr 2020
12 Apr 2020
2020 Extra Class study guide: E1F – Miscellaneous rules: external RF power amplifiers; prohibited communications; spread spectrum; auxiliary stations; Canadian amateurs operating in the U.S.; special temporary authority; control operator of an auxiliary stationoriginal ↗
6 Apr 2020
2020 Extra Class study guide: E1E – Volunteer examiner program: definitions; qualifications; preparation and administration of exams; accreditation; question pools; documentation requirementsoriginal ↗
6 Apr 2020
2020 Extra Class study guide: E1D – Amateur space and Earth stations; telemetry and telecommand rules; identification of balloon transmissions; one-way communicationsoriginal ↗
5 Apr 2020
2020 Extra Class study guide: E1C – Rules pertaining to automatic and remote control; band-specific regulations; operating in, and communicating with foreign countries; spurious emission standards; HF modulation index limit; bandwidth definitionoriginal ↗
4 Apr 2020
2020 Extra Class study guide: E1B – Station restrictions and special operations: restrictions on station location; general operating restrictions; spurious emissions; antenna structure restrictions; RACES operationsoriginal ↗
3 Apr 2020
2020 Extra Class study guide: E1A – Operating Standards: frequency privileges; automatic message forwarding; stations aboard ships or aircraft; power restriction on 630 and 2200 meter bandsoriginal ↗
2 Apr 2020
31 Mar 2020
2020 Extra Class study guide: E2D – Operating methods: VHF and UHF digital modes and procedures; APRS; EME procedures, meteor scatter proceduresoriginal ↗
30 Mar 2020
2020 Extra Class study guide: E2C – Operating methods: contest and DX operating; remote operation techniques; Cabrillo format; QSLing; RF network connected systemsoriginal ↗
29 Mar 2020
2020 Extra Class study guide: E2B – Television practices: fast scan television standards and techniques; slow scan television standards and techniquesoriginal ↗
27 Mar 2020
2020 Extra Class study guide: E2A – Amateur radio in space: amateur satellites; orbital mechanics; frequencies and modes; satellite hardware; satellite operationsoriginal ↗
26 Mar 2020
2020 Extra Class study guide: E4E – Noise suppression and interference: system noise; electrical appliance noise; line noise; locating noise sources; DSP noise reduction; noise blankers; grounding for signals; common mode currentsoriginal ↗
25 Mar 2020
24 Mar 2020
2020 Extra Class study guide: E4D – Receiver performance characteristics: blocking dynamic range; intermodulation and cross-modulation interference; third-order intercept; desensitization; preselectororiginal ↗
24 Mar 2020
24 Mar 2020
2020 Extra Class study guide: E4C – Receiver performance characteristics: phase noise, noise floor, image rejection, MDS, signal-to-noise ratio, noise figure, reciprocal mixing; selectivity; effects of SDR receiver non-linearity; use of attenuators at low frequenciesoriginal ↗
23 Mar 2020
2020 Extra Class study guide: E4B – Measurement technique and limitations: instrument accuracy and performance limitations; probes; techniques to minimize errors; measurement of Q; instrument calibration; S parameters; vector network analyzersoriginal ↗
22 Mar 2020
2020 Extra Class study guide: E4A – Test equipment: analog and digital instruments; spectrum analyzers; antenna analyzers; oscilloscopes; RF measurements; computer-aided measurementsoriginal ↗
20 Mar 2020
2020 Extra Class study guide: E3C – Radio horizon; ground wave; propagation prediction techniques and modeling; effects of space weather parameters on propagationoriginal ↗
19 Mar 2020
Amateur radio in the news: Fulton club learns about its history, high school kids earn licenses, Motorola wins lawsuitoriginal ↗
19 Mar 2020
2020 Extra Class study guide: E3B – Transequatorial propagation; long-path; ordinary and extraordinary waves; chordal hop; sporadic E mechanismsoriginal ↗
18 Mar 2020
2020 Extra Class study guide: E3A – Electromagnetic waves; Earth-Moon-Earth communications; meteor scatter; microwave tropospheric and scatter propagation; aurora propagation; ionospheric propagation changes over the day; circular polarizationoriginal ↗
18 Mar 2020
2020 Extra Class study guide: E9H – Receiving Antennas: radio direction finding antennas; Beverage antennas; specialized receiving antennas; long-wire receiving antennasoriginal ↗
16 Mar 2020
2020 Extra Class study guide: E9F – Transmission lines: characteristics of open and shorted feed lines; coax versus open-wire; velocity factor; electrical length; coaxial cable dielectricsoriginal ↗
12 Mar 2020
From the trade magazines: On-off keying gets the job done, what you should know about RMS and communications electronicoriginal ↗
10 Mar 2020
2020 Extra Class study guide: E9E – Matching: matching antennas to feed lines; phasing lines; power dividersoriginal ↗
9 Mar 2020
6 Mar 2020
2020 Extra Class study guide: E9D – Yagi antennas; parabolic reflectors; circular polarization; loading coils; top loading; feedpoint impedance of electrically short antennas; antenna Q; RF groundingoriginal ↗
5 Mar 2020
2020 Extra Class study guide: E9C – Practical wire antennas; folded dipoles; phased arrays; effects of ground near antennasoriginal ↗
4 Mar 2020
2020 Extra Class study guide: E9B – Antenna patterns and design: E and H plane patterns; gain as a function of pattern; antenna modelingoriginal ↗
3 Mar 2020
2020 Extra Class study guide: E9A Basic antenna parameters: radiation resistance, gain, beamwidth, efficiency, effective radiated poweroriginal ↗
2 Mar 2020
1 Mar 2020
1 Mar 2020
2020 Extra Class study guide: E7H – Oscillators and signal sources: types of oscillators; synthesizers and phase-locked loops; direct digital synthesizers; stabilizing thermal drift; microphonics; high-accuracy oscillatorsoriginal ↗
28 Feb 2020
2020 Extra Class study guide: E7G – Active filters and op-amps: active audio filters; characteristics; basic circuit design; operational amplifiersoriginal ↗
27 Feb 2020
2020 Extra Class study guide: E7F – DSP filtering and other operations; software defined radio fundamentals; DSP modulation and demodulationoriginal ↗
25 Feb 2020
25 Feb 2020
2020 Extra Class study guide: E7E – Modulation and demodulation: reactance, phase and balanced modulators; detectors; mixer stagesoriginal ↗
24 Feb 2020
2020 Extra Class study guide: E7D – Power supplies and voltage regulators; Solar array charge controllersoriginal ↗
20 Feb 2020
2020 Extra Class study guide: E7C – Filters and matching networks: types of networks; types of filters; filter applications; filter characteristics; impedance matching; DSP filteringoriginal ↗
19 Feb 2020
2020 Extra Class study guide: E7B – Amplifiers class of operation; vacuum tube and solid-state circuits; distortion and intermodulation; spurious and parasitic suppression; microwave amplifiers; switching-type amplifiersoriginal ↗
18 Feb 2020
2020 Extra Class study guide: E7A – Digital circuits: digital circuit principles and logic circuits; classes of logic elements; positive and negative logic; frequency dividers; truth tablesoriginal ↗
17 Feb 2020
2020 Extra Class study guide – E6F: Electro-optical technology: photoconductivity; photovoltaic devices; optical sensors and encoders; optical isolationoriginal ↗
16 Feb 2020
14 Feb 2020
ARRL Board January meeting minutes: K5UR narrowly re-elected, life membership, new legislative proposalsoriginal ↗
13 Feb 2020
2020 Extra Class study guide – E6D – Toroidal and solenoidal Inductors: permeability, core material, selecting, winding; transformers; piezoelectric devicesoriginal ↗
12 Feb 2020
2020 Extra Class study guide: E6C – Digital ICs: Families of digital ICs; gates; Programmable Logic Devices (PLDs)original ↗
11 Feb 2020
Amateur radio operators in the news: 96-year-old ham makes out-of-this world QSO, K1ALL, WA4YO (SK)original ↗
10 Feb 2020
2020 Extra Class study guide: E6A – Semiconductor materials and devices: semiconductor materials; germanium, silicon, P-type, N-type; transistor types: NPN, PNP, junction, field-effect transistors: enhancement mode; depletion mode; MOS; CMOS; N-channel; P-channeloriginal ↗
7 Feb 2020
2020 Extra Class study guide: E5D – AC and RF energy in real circuits: skin effect; electromagnetic fields; reactive power; power factor; electrical length of conductors at UHF and microwave frequencies; microstriporiginal ↗
4 Feb 2020
2020 Extra Class study guide: E5C – Impedance plots and coordinate systems: plotting impedances in polar coordinates; rectangular coordinatesoriginal ↗
3 Feb 2020
ICQPodcast #317 discusses ARRL CEO dismissal, public service activities in India and Australia, and ARRL statement on FCC’s 3 GHz proposaloriginal ↗
3 Feb 2020
2020 Extra Class study guide: E5B – Time constants and phase relationships: RL and RC time constants; phase angle in reactive circuits and components; admittance and susceptanceoriginal ↗
2 Feb 2020
2020 Extra Class study guide: E5A – Resonance and Q: characteristics of resonant circuits; series and parallel resonance; Q; half-power bandwidth; phase relationships in reactive circuitsoriginal ↗
31 Jan 2020
30 Jan 2020
Amateur radio in the news: Australian hams track fires, club doubles hamfest attendance, club awarded $1,000original ↗
29 Jan 2020
28 Jan 2020
24 Jan 2020
22 Jan 2020