Technical Basics
... • Batteries provide a source of DC power • DC- Direct Current, flows in a single direction ...
... • Batteries provide a source of DC power • DC- Direct Current, flows in a single direction ...
Difference between Wide band and Narrow band Radio Module
... The frequency band over 1GHz such as Wireless LAN, C-band used for satellite broadcast, and KU-band is well suited to fixed communication. While the frequency band under 1GHz is well suited to mobile communication. As well known, high frequency radio wave has same characteristic as light, the freque ...
... The frequency band over 1GHz such as Wireless LAN, C-band used for satellite broadcast, and KU-band is well suited to fixed communication. While the frequency band under 1GHz is well suited to mobile communication. As well known, high frequency radio wave has same characteristic as light, the freque ...
Omnio AG, CH-8426 Lufingen
... Connect the Ratio® repeater to power supply. There is no need to learn in devices. All received telegramms will be transmitted. Legal regulations The senders must not be used with other devices that are used directly or indirectly for live or health ensuring purposes for humans or by whose operation ...
... Connect the Ratio® repeater to power supply. There is no need to learn in devices. All received telegramms will be transmitted. Legal regulations The senders must not be used with other devices that are used directly or indirectly for live or health ensuring purposes for humans or by whose operation ...
RFI Unit Objectives - MIT Haystack Observatory
... distance of a few inches and can be detected by an AM receiver tuned to an empty channel. Explain the physics behind how this transmitter works (changing current Æ accelerating charges). Explain why the static is strongest the instant the nickel taps and disappears or reduces afterwards. ...
... distance of a few inches and can be detected by an AM receiver tuned to an empty channel. Explain the physics behind how this transmitter works (changing current Æ accelerating charges). Explain why the static is strongest the instant the nickel taps and disappears or reduces afterwards. ...
Amateur Radio Technician Class Element 2 Course Presentation
... flowing on the shield of an audio cable? ...
... flowing on the shield of an audio cable? ...
Amateur Radio Technician Class Element 2 Course
... The alternator is the source of a high-pitched whine that varies with engine speed in a mobile transceiver’s receive audio. T4A11 A mobile transceiver’s power negative connection should be made at the battery or engine block ground strap. T4A10 ...
... The alternator is the source of a high-pitched whine that varies with engine speed in a mobile transceiver’s receive audio. T4A11 A mobile transceiver’s power negative connection should be made at the battery or engine block ground strap. T4A10 ...
The Fundamentals of Ham Radio and Emergency Communications
... system. This is used when there is an emergency or an event that requires there be no communications holding up the frequency. When an official communication system is in effect, all non-emergency traffic is asked to refrain from using that frequency. This is helpful because it allows for a more con ...
... system. This is used when there is an emergency or an event that requires there be no communications holding up the frequency. When an official communication system is in effect, all non-emergency traffic is asked to refrain from using that frequency. This is helpful because it allows for a more con ...
Module 11
... • Operates from 12 volts dc, requires external power supply. • Requires an external antenna. • Can be operated mobile or as a base station. • Limited to frequency modulation (FM) and usually either 2 meters or 70 cm bands. • Up to approximately 50 watts output. ...
... • Operates from 12 volts dc, requires external power supply. • Requires an external antenna. • Can be operated mobile or as a base station. • Limited to frequency modulation (FM) and usually either 2 meters or 70 cm bands. • Up to approximately 50 watts output. ...
Clear-Com Gateway Datasheet
... Gateway devices offer advanced radio interfacing for analog and digital radios with a suite of programmable features to meet the most demanding radio and Land Mobile Radio (LMR) applications. When connected to Clear-Com intercom systems, 4-wire port signaling is provided to activate features and tri ...
... Gateway devices offer advanced radio interfacing for analog and digital radios with a suite of programmable features to meet the most demanding radio and Land Mobile Radio (LMR) applications. When connected to Clear-Com intercom systems, 4-wire port signaling is provided to activate features and tri ...
![T4B [15]-[25]](http://s1.studyres.com/store/data/005928511_1-974b25e2a6d2fb87d6e11948369e8362-300x300.png)
T4B [15]-[25]
... connector type B. Some connectors include push-to-talk and voltages for powering the microphone C. All transceivers using the same connector type are wired identically D. Un-keyed connectors allow any microphone to be connected ...
... connector type B. Some connectors include push-to-talk and voltages for powering the microphone C. All transceivers using the same connector type are wired identically D. Un-keyed connectors allow any microphone to be connected ...
Safety - QSL.net
... – Distracted driving – RF induction into vehicle/vessels control circuits • Secure equipment, check cable routing/protection, use correct fusing, use hands free equipment, pay attention to good radio housekeeping ...
... – Distracted driving – RF induction into vehicle/vessels control circuits • Secure equipment, check cable routing/protection, use correct fusing, use hands free equipment, pay attention to good radio housekeeping ...
here - Novatech Instruments
... powered rectifier tube) became more common just before World War II. Batteries were in scarce supply during the war, so after the battery went dead many of these radios were no longer used. Production of civilian radios halted in 1942. ...
... powered rectifier tube) became more common just before World War II. Batteries were in scarce supply during the war, so after the battery went dead many of these radios were no longer used. Production of civilian radios halted in 1942. ...
AE6FK`s outline
... distortion, interference, over and under modulation, RF feedback, off frequency signals; fading and noise; problems with digital communications interfaces T7C – Antenna measurements and troubleshooting; measuring SWR, dummy loads, feedline failure modes T7D – Basic repair and testing; soldering, use ...
... distortion, interference, over and under modulation, RF feedback, off frequency signals; fading and noise; problems with digital communications interfaces T7C – Antenna measurements and troubleshooting; measuring SWR, dummy loads, feedline failure modes T7D – Basic repair and testing; soldering, use ...
JRC NRD 535 HF All Mode Comms Receiver Used
... The Japan Radio Company JRC NRD 535 affords general coverage reception from 90 to 30000 kHz in AM, USB, LSB, CW, RTTY, FAX and narrow FM modes. A triple conversion superheterodyne circuit is employed to provide superb sensitivity and image rejection. Japan Radio has designed a special high-speed 1 H ...
... The Japan Radio Company JRC NRD 535 affords general coverage reception from 90 to 30000 kHz in AM, USB, LSB, CW, RTTY, FAX and narrow FM modes. A triple conversion superheterodyne circuit is employed to provide superb sensitivity and image rejection. Japan Radio has designed a special high-speed 1 H ...
A more detailed Key Word List
... devoted primarily to recreational, educational, and emergency purposes. Amplifier – A device which “amplifies” or increases the strength of a signal. Antenna – An electrically conductive device which is used to convey radio signals out into the air, or pick radio signals up out of the air. Audio Fre ...
... devoted primarily to recreational, educational, and emergency purposes. Amplifier – A device which “amplifies” or increases the strength of a signal. Antenna – An electrically conductive device which is used to convey radio signals out into the air, or pick radio signals up out of the air. Audio Fre ...
G4A-G4E_(28)
... Bypass capacitors might be useful in reducing RF interference to audiofrequency devices. (G4C01) ...
... Bypass capacitors might be useful in reducing RF interference to audiofrequency devices. (G4C01) ...
Radio Merit Badge Key Word List
... Integrated Circuit (IC) – A component that consists of several semiconductor devices (transistors, diodes, etc) formed together into a single component. An IC can also be called a microchip or chip. Insulator – A substance that does not easily conduct electricity. Insulators contain very few free e ...
... Integrated Circuit (IC) – A component that consists of several semiconductor devices (transistors, diodes, etc) formed together into a single component. An IC can also be called a microchip or chip. Insulator – A substance that does not easily conduct electricity. Insulators contain very few free e ...
A short user manual by OH6MLD
... This radio can be used by amateur radio operators just simply replacing the EPROM with the firmware (latest 1.4) for HAM use and of course retuning the RF units for 430 MHz band. Note that these instructions are made for Nokia HD40 S02G2 model, which is originally Kyodo KG109T, operating from 440 Mh ...
... This radio can be used by amateur radio operators just simply replacing the EPROM with the firmware (latest 1.4) for HAM use and of course retuning the RF units for 430 MHz band. Note that these instructions are made for Nokia HD40 S02G2 model, which is originally Kyodo KG109T, operating from 440 Mh ...
HF Digital Modes
... Used to have a regular conversation in a similar way to voice or CW, where one operator talks for a minute or two, then another does the same. Normally a two party QSO, but these chat modes could allow multiple operators to take part in a net. ...
... Used to have a regular conversation in a similar way to voice or CW, where one operator talks for a minute or two, then another does the same. Normally a two party QSO, but these chat modes could allow multiple operators to take part in a net. ...
Your First Radio (8)+(4)+(15)
... for voice transmissions is SSB signals have narrower bandwidth. Upper sideband (USB) is normally used for 10 meter HF,VHF and UHF single-sideband communications. A Transverter takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal. ...
... for voice transmissions is SSB signals have narrower bandwidth. Upper sideband (USB) is normally used for 10 meter HF,VHF and UHF single-sideband communications. A Transverter takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal. ...
Subject: R/S HTX-100 Modifications
... components on it. Locate the processor chip IC401 (UC-1208).Locate pins 28 and 29 which are on the right hand side of the chip and are 4th and 5th from the top. Note they are bridged with solder. CAREFULLY cut the copper track NEXT to the pins. DO NOT attempt to unsolder the two pins form the board. ...
... components on it. Locate the processor chip IC401 (UC-1208).Locate pins 28 and 29 which are on the right hand side of the chip and are 4th and 5th from the top. Note they are bridged with solder. CAREFULLY cut the copper track NEXT to the pins. DO NOT attempt to unsolder the two pins form the board. ...
The History of Radio and Television (Part 1)
... • In the United States, government may fund electronic-media experiments, but it’s up to business to apply the results. • The key to telecommunications is that electromagnetic energy can be transmitted between two points. • The early stage of media development is a process to which many people contr ...
... • In the United States, government may fund electronic-media experiments, but it’s up to business to apply the results. • The key to telecommunications is that electromagnetic energy can be transmitted between two points. • The early stage of media development is a process to which many people contr ...
Walkie-talkie
A walkie-talkie (more formally known as a handheld transceiver, or HT) is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald L. Hings, radio engineer Alfred J. Gross, and engineering teams at Motorola. Similar designs were created for other armed forces, and after the war, walkie-talkies spread to public safety and eventually commercial and jobsite work. Major characteristics include a half-duplex channel (only one radio transmits at a time, though any number can listen) and a ""push-to-talk"" (PTT) switch that starts transmission. Typical walkie-talkies resemble a telephone handset, possibly slightly larger but still a single unit, with an antenna mounted on the top of the unit. Where a phone's earpiece is only loud enough to be heard by the user, a walkie-talkie's built-in speaker can be heard by the user and those in the user's immediate vicinity. Hand-held transceivers may be used to communicate between each other, or to vehicle-mounted or base stations.