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angle modulation
angle modulation

... of the RX which proportional to the square of modulation index. Angle modulation is resistant to propagation-induced selective fading since amplitude variations are unimportant and are removed at the receiver using a limiting circuit. Angle modulation is very effective in rejecting interference. (mi ...
SECTION
SECTION

... The data radio unit shall provide the capability of receiving digital signal transmissions from a master station data radio unit and returning transmissions to the master station data radio unit as required by the Freeway and Arterial System of Transportation (FAST) data radio system. ...
Comparison of Transverter vs. Tranceiver Performance (K2DH)
Comparison of Transverter vs. Tranceiver Performance (K2DH)

... First, generally, transceivers cost quite a bit of money. Newer all-mode transceivers can easily run $1-2k, more in some cases. For someone starting out on these bands, this kind of expense may be out of range. Second, whenever a radio is made to cover a wide range of frequencies (such as several VH ...
UNIT 18 - Index of
UNIT 18 - Index of

... The FM detector is more complex and quite different from an AM detector and consists of a discriminator. As well as extracting and passing on the a.f, it removes ^У amplitude changes in the carrier arising from unwanted 'noise' - see section 11-10. 'Quiet' reception is another good feature of FM. ( ...
AN-146 FM Remote Speaker System
AN-146 FM Remote Speaker System

... stereo system source. The signal for the transmitter is ideally taken from the MONITOR or TAPE OUT connectors provided on component system Hi-Fi receivers. If these outputs are not available, the signal could be taken from the main or extra speaker terminals, although the remote volume would then be ...
PowerLight Series
PowerLight Series

... and reduced weight. Four models offer a range of power from 725 to 3,500 watts per channel, allowing you to choose the right power for your special application. With PowerLight technology, PowerLight amplifiers take your sound to a whole new level. Not only does it give you tighter bass and clean tr ...
EASA Weekend Technician Class 3
EASA Weekend Technician Class 3

... Should another operator reports that your stations 2 meter signals were strong just a moment ago, but now they are weak or distorted, try moving a few feet, as random reflections may be causing multi-path distortion. ...
EASA Weekend Technician Class 3
EASA Weekend Technician Class 3

... An auxiliary station transmits signals over the air from a remote receive site to a repeater for retransmission. Call sign identification is required for a station transmitting phone signals by sending the call sign using CW or phone emission. Repeaters can identify with a voice message announcing t ...
4520.RF Basics and Getting Started 2012
4520.RF Basics and Getting Started 2012

... – Shorter range than a sub 1 GHz solution (same output power) – Many possible interferers are present in the band ...
frequency modulation
frequency modulation

... – Noise can interfere with an FM signal and particularly with the high-frequency components of the modulating signal. – Noise is primarily sharp spikes of energy and contains a lot of harmonics and other high-frequency components. – To overcome high-frequency noise, a technique known as preemphasis ...
RCI-2970N2 AM / FM /SSB 200 Watt Dual Band Radio Review
RCI-2970N2 AM / FM /SSB 200 Watt Dual Band Radio Review

... 9. NB/ANL BUTTON (NB/ANL): The noise blanker (NB) is very effective in eliminating repetitive impulse noise such as ignition interference. In the ANL position, the AUTOMATIC NOISE LIMITER also limits noise at the receiver audio stages. 10. ROGER BEEP BUTTON (R.BEEP): This switch activates the ROGER ...
Amateur Radio Technician Class Element 2 Course
Amateur Radio Technician Class Element 2 Course

...  Interference to and from consumer devices • Receiver front-end overload is the result of interference caused by strong signals from a nearby source. • The owner of the television receiver is responsible for taking care of the interference if signals from your transmitter are causing front end over ...
HAMTRONICS® R303 VHF FM RECEIVER: INSTALLATION
HAMTRONICS® R303 VHF FM RECEIVER: INSTALLATION

... the i-f with steep skirts for close channel spacing or repeater operation. The i-f selectivity, for instance, is down over 100dB at ±12 kHz away from the carrier, which is 40-50 dB better than most transceivers. Low noise fet's in the front end provide good overload resistance and excellent sensitiv ...
FRX-3E Long-Haul Microwave Radio System
FRX-3E Long-Haul Microwave Radio System

... provides long reach and high throughput capabilities. It also scales for low capacity applications with an in-service growth path to higher density without having to purchase all of the capacity up front. The FRX-3E is a reliable, robust and scalable solution for long haul, high-capacity wireless ba ...
5.1 Radio Signals & Equipment
5.1 Radio Signals & Equipment

... meant by an NAK response to a transmitted packet? ...
Apilus Platinum Pure 27mHz pdf
Apilus Platinum Pure 27mHz pdf

... With the energy concentration of the Apilus® Platinum Pure™, it is possible to obtain results much more rapidly than with any other epilator currently on the market. Due to the ultrarapid 27 MHz radio frequency applied precisely inside the follicle, the Apilus® Platinum Pure™ can permanently elimina ...
RevF_093B
RevF_093B

... analog scan rates must be adjusted accordingly. This can be achieved by multiplying the rates (table above) by the factor (3 seconds / tr) where / tr is the response time in seconds. For example, if tr is 30 seconds, (3 seconds / tr) is 0.1. The rate for the 1 kHz to 10 kHz range becomes 3.33 Hz/sec ...
RevF_093b
RevF_093b

... analog scan rates must be adjusted accordingly. This can be achieved by multiplying the rates (table above) by the factor (3 seconds / tr) where / tr is the response time in seconds. For example, if tr is 30 seconds, (3 seconds / tr) is 0.1. The rate for the 1 kHz to 10 kHz range becomes 3.33 Hz/sec ...
Annex 3 - UNDP in Moldova
Annex 3 - UNDP in Moldova

... - Transmitting up to 64 CHs high quality digital audio - Immunity to RF interference from mobile devices - Built-in loudspeaker - Built-in volume control for headphones - 3.5 mm stereo headphone jack - 3.5 mm socket for external microphone or headset microphone - Frequency response 20 Hz to 20 kHz - ...
A Good Regenerative Receiver
A Good Regenerative Receiver

... receivers. A part of the oscillator signal is transmitted via the antenna that is coupled to the regenerative detector. You can avoid this by adding a RF amplifier stage between the antenna and the regenerative detector. However, adding a broadband RF amplifier was not a success, it was often overlo ...
Chapter 2 part IV_updated 23 july - MetaLab
Chapter 2 part IV_updated 23 july - MetaLab

... This section includes a radio frequency oscillator stage (LO) and a mixer/converter stage (the first detector) which is a nonlinear device used to convert RF’s to IF’s (RF to IF frequency translation). IF signal in commercial AM broadcast are between 450kHz and 460kHz. The most common IF used is 455 ...
HAMTRONICS® R451 UHF FM RECEIVER: INSTALLATION
HAMTRONICS® R451 UHF FM RECEIVER: INSTALLATION

... This allows for some fading on mobile stations and prevents squelch pumping on heavy modulation. It also prevents cycling due to slight desense in repeater installations. Of course, this requires setting the threshold a little higher than if there was no hysteresis so that it will close with no sign ...
Word - ITU
Word - ITU

... In the above method, the amplitudes of the two test tones at 2f0 and 3f0   are equal. The peak amplitude of a mixture of two equal amplitude tones, whose frequencies are not related by small whole numbers, is twice the peak amplitude of each individual tone. Thus, to test the circuit to a peak amp ...
Optimizing the Heathkit HW-101, SB100-102 Transceivers
Optimizing the Heathkit HW-101, SB100-102 Transceivers

... equidistant from the center of the I.F. filter passband. After the rig reaches a stable operating temperature (1/2 hour) disconnect any antenna and peak the preselector for maximum receiver gain. Next turn up the volume control to a slightly higher than normal level and listen closely to the hiss co ...
FT-2800M - Yaesu.com
FT-2800M - Yaesu.com

... specifications, model numbers, and availability. Precise frequency range may be different in some countries. Some accessories shown herein may not be available in some countries. Some information may have been updated since the time of printing; please check with your Authorized Yaesu Dealer for com ...
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FM broadcasting



FM broadcasting is a VHF broadcasting technology, pioneered by Edwin Howard Armstrong, which uses frequency modulation (FM) to provide high-fidelity sound over broadcast radio. The term ""FM band"" describes the frequency band in a given country which is dedicated to FM broadcasting. This term is slightly misleading, as it equates a modulation method with a range of frequencies.
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