One question. One answer. Zero noise.
The insulated or reverse-biased gate structure of an FET draws very little DC current, so an FET generally has much higher DC input impedance than a bipolar transistor.
DMR, D-STAR, and System Fusion are digital voice systems used in amateur radio.
Impedance is the opposition a circuit presents to alternating current. Like resistance, impedance is measured in ohms.
The propagation speed of an electromagnetic wave in a medium is determined by the medium's index of refraction.
The portion of the 10-meter band above 29.5 MHz is available for repeater operation under the rule cited by this question.
Multiple delayed copies of a digital signal can overlap at the receiver and make symbol decisions harder. The result is an increased data error rate.
At microwave frequencies, even short conductors represent significant fractions of a wavelength. Short connections reduce unwanted phase shift along the path.
A Technician who has an unexpired CSCE showing successful completion of the General exam may operate in General or Technician band segments while awaiting the database upgrade.
Chordal-hop propagation consists of successive ionospheric refractions without an intervening reflection from Earth's surface.
ARES is made up of licensed amateurs who voluntarily register their capabilities and equipment so they can provide public-service communications when needed.
Microwave tropospheric ducting commonly supports paths on the order of 100 to 300 miles, substantially beyond the normal line-of-sight horizon.
The official G7C08 source identifies input amplifier noise figure as one of the parameters that affects receiver sensitivity.
The prefix milli means one-thousandth. Therefore one ampere equals 1000 milliamperes, so 1.5 amperes equals 1500 milliamperes.
On lower HF bands, atmospheric noise is often much stronger than the receiver's own internal noise. Moderate attenuation reduces signal and external noise together with little change in overall SNR while helping prevent overload.
A Beverage is a long, directional receiving antenna widely used on MF and the lower HF bands because it offers useful directivity and low-noise reception.
The official E0A06 source identifies the possibility that electric- and magnetic-field peaks occur in different places, so one measurement does not necessarily represent the other.
Use P = E × I. Multiplying 13.8 volts by 10 amperes gives 138 watts.
As antenna height increases, the lowest elevation lobe generally moves to a lower takeoff angle.
Larger-diameter Yagi elements have lower Q, which broadens the antenna's usable frequency range.
In figure T-2, component 3 is the symbol for a single-pole single-throw switch: one pole that simply opens or closes one circuit.
For an ideal capacitor, current reaches its peak one-quarter cycle before voltage does, so current leads voltage by 90 degrees.
If a skywave signal reaches you by both short-path and long-path propagation, the different travel times can produce a slightly delayed echo.
Telemetry is the one-way transmission of measurements from a remote measuring instrument.
A properly keyed CW signal is extremely narrow. The Technician pool uses approximately 150 Hz as its required bandwidth.