Radio Frequency Interference. ARRL Book Section 3.5
|
|
- Candace Turner
- 5 years ago
- Views:
Transcription
1 Radio Frequency Interference ARRL Book Section 3.5
2 Interference Hearing something or signals getting where not suppose to Things like hearing the radio on your telephone or telephone calls on your TV Sometimes get complaints that radio is interfering with neighbors television Since TV and amateur radio use different frequencies that should not happen Can happen if your radio is putting out off frequency signals or TV has poor shielding and tuning and tunes in anything in the area TV and telephone manufactures are notorious for this problem Doppler shift does not cause interference problems (T5D02) The major cause of telephone interference is that the phone was not built with proper interference protection (T3D03) The most likely cause of telephone interference from a nearby transmitter is that telephones components are making it act like a radio receiver (T5D03)
3 Fundamental Overload Quality of device design measured when very strong but off frequency signals in the area proper shielding should block Strong off frequency signals can interfere If I can reject 99% of stray signal but the stray signal is 100 times stronger than what I m listening to I will have interference Called Front End Overload when interference results from a strong nearby source (T3D11) Can also be called Fundamental Overload when one is talking about a receiving device getting interference from strong but off-frequency signals (T5D01)
4 Cable Television Can get interference with cables with bad shielding If there is a break in the cable Radio signals can be picked up by cable line or cable signals can radiate out and be picked up by Radio (T3D07) Obviously the cable company needs to fix their cable Interesting problem BPL trying to send data over bare power lines Lines radiate signals notorious for interfering with HF Called unintentional radiator FCC is responsible for seeing that people don t put out signals on someone elses frequency Bush administration was pushing BPL but FCC lost a case and was ordered to protect other peoples frequencies
5 What To Do If You Get a Complaint Check you station to make sure it meets standards for good amateur practice (T5D08) This would be checking for things like proper connections, grounding, antennas Make sure your station is operating properly and that it does not cause interference with your own TV (T5D05) If radio is not operating properly it can put out stray frequencies or harmonics Your TV is probably much closer if your radio is putting out TV signals you should have the problem To stop spurious emissions you can install a filter at the transmitter (T5A06)
6 Types of Filters High pass filters (block all frequencies below a certain frequency but let high frequencies pass) I wonder whether that is why they are called high pass filters Low pass filters (block frequencies higher than a certain frequency but let low frequencies pass) Band Pass filter (allow only frequencies in a certain range to pass) Notch Filter (opposite of a band pass filter blocks only a certain frequency range) Snap on Ferrite Choke One of problems is that coax cable or a rain gutter can start acting like an antenna and send out harmonics of an intended signal Chokes reduce or stop that tendency All of these types of devices can be used to correct radio interference problems (T5D07)
7 Who Is Responsible to Fix? If your neighbors TV is getting front end overload from your radio it is the TV sets owners responsibility to fix (T3D02) Often people don t have a clue how to keep radio waves from getting into their equipment the trick is filters that eliminate frequencies art suppose to be monitored If manufactures didn t short cut they would have put them there in the first place
8 Things to try If a TV is getting front end overload from a 2 meter transceiver try a notch filter that blocks out 2 meter amateur band (T5A07) If a telephone is having a radio interference problem install an RF filter on the telephone (T5D04)
9 What if Your Radio is Picking Up the Interference Overload will often be bursts of tones or unwanted conversations suddenly popping in (T9B03) FCC allows household devices to put out weak signals on other users frequencies provided they don t cause interference These are called part 15 devices If you radio station is getting interference from a neighbor s part 15 device, check to make sure your station meets good amateur radio design standards (if someone is using your frequency with an unlicensed device you can t filter it) work with your neighbor to identify the device, if problem cannot be corrected politely inform him that FCC rules require him to stop using the device. (T5D09)
10 Other Amateurs Are A Great Resource in Helping You Track Down Problems If another operator tells you that he hears a high pitched variable whine from your mobile the most likely cause is the radio s wiring is picking up noise from the vehicle s electrical system (T5D10) One of the reasons Chris Pixton dislikes my plug the radio through the cigarette lighter trick.
Operating Station Equipment
Amateur Radio License Class Operating Station Equipment Presented by Steve Gallafent October 3, 2007 Operating Station Equipment Modulation Modulation is the process of adding information to a radio signal
More informationInterference & Suppression Page 59
INTERFERENCE Interference & Suppression Page 59 Front-End Overload, Cross-Modulation What is meant by receiver overload? Interference caused by strong signals from a nearby transmitter What is one way
More informationSUBELEMENT T4. Amateur radio practices and station set up. 2 Exam Questions - 2 Groups
SUBELEMENT T4 Amateur radio practices and station set up 2 Exam Questions - 2 Groups 1 T4A Station setup: connecting microphones; reducing unwanted emissions; power source; connecting a computer; RF grounding;
More informationAn Introduction to Radio Frequency Interference
An Introduction to Radio Frequency Interference Ron Hranac, N0IVN Member, ARRL EMC Committee ARRL Colorado Section Technical Specialist What is RFI? RFI is an abbreviation for radio frequency interference
More informationUsing Ferrite Beads Keep RF Out of TV Sets, Telephones, VCR's Burglar Alarms and other Electronic Equipment
Using Ferrite Beads Keep RF Out of TV Sets, Telephones, VCR's Burglar Alarms and other Electronic Equipment RFI and TVI have been with us for a long time. Now we have microwave ovens, VCR's and many other
More informationCOAXIAL TRANSMISSION LINE COMMON-MODE CURRENT
COAXIAL TRANSMISSION LINE COMMON-MODE CURRENT Introduction Coaxial transmission lines are popular for their wide frequency bandwidth and high resistance to electromagnetic interference (EMI). Coax cables
More informationAmateur Radio License. Radios, Power, RFI
Amateur Radio License Radios, Power, RFI Todays Topics Types of Modulation : Chapter 2 Radio Equipment : Chapter 5 Radios Digital Communications Power Supplies and Batteries RF Interference, Grounding
More informationRadio Frequency Interference! Al Penney VO1NO
Radio Frequency Interference! RFI and EMI Radio Frequency Interference (RFI) Interference to a receiver caused by actual signals, only one of which is desired. Caused by harmonics, mixing, images, or poor
More information9/17/2012. Chapter 5. Amateur Radio Equipment. Generalized Transceiver Categories
Chapter 5 Amateur Radio Equipment Generalized Transceiver Categories Single Band Dual Band Multimode Multiband Handheld (HT) VHF or UHF FM VHF/UHF FM VHF/UHF HF and VHF/UHF FM (VHF, UHF, or Both) 1 Single
More informationLesson 9: Base Stations
Lesson 9: Base Stations Preparation for Amateur Radio Technician Class Exam Topics Home Stations Basic Station Layout RTTY and Data Communications Station Accessories Wavelengths Feed Lines Impedance-matching
More informationLocating and Killing Receiver Interference. Gary Johnson, NA6O January, 2018
Locating and Killing Receiver Interference Gary Johnson, NA6O January, 2018 1 Agenda Types of noise and interference Typical noise sources Finding the noise Noise mitigation Your rights per the FCC References
More informationR-400A Telemetry Receiver For Law Enforcement Tracking
R-400A Telemetry Receiver For Law Enforcement Tracking COVERS THE ENTIRE 216.000-219.999MHz BAND IN 1kHz STEPS FOR QUICK AND ACCURATE FREQUENCY SELECTION SUPER SELECTIVE 8 POLE SSB CRYSTAL FILTER FOR GREATER
More informationTechnician Licensing Class. Antennas
Technician Licensing Class Antennas Antennas A simple dipole mounted so the conductor is parallel to the Earth's surface is a horizontally polarized antenna. T9A3 Polarization is referenced to the Earth
More informationTechnician License Course Chapter 4. Lesson Plan Module 9 Antenna Fundamentals, Feed Lines & SWR
Technician License Course Chapter 4 Lesson Plan Module 9 Antenna Fundamentals, Feed Lines & SWR The Antenna System Antenna: Transforms current into radio waves (transmit) and vice versa (receive). Feed
More informationDX AM FM SSB CW PA Amateur Base Station Transceiver OWNER S MANUAL RX / TX 2 4 POWER NF CHANNEL MODE RF POWER OFF CAL OFF OFF CALIBRATE
1 2 3 6 4050 ULA 6070 TI 80 90 100 9 DX 2517 2517 RX / TX 0 2 4 SWR WATTS SET 81012 22 1 010 3 2030 5 MOD 7 ON dbover 9 SIGNAL +20 +40+60 PA FM AM USB LSB CW POWER ON SWR NB / ANL R.BEEP +10KHz NF CHANNEL
More informationTechnician Licensing Class
Technician Licensing Class Talk to Outer Presented Space by Amateur Radio Technician Class Element 2 Course Presentation ELEMENT 2 SUB-ELEMENTS (Groupings) About Ham Radio Call Signs Control Mind the Rules
More informationCON NEX HP. OWNER'S MANUAL Full Channel AM/FM Amateur Mobile Transceiver TABLE OF CONTENTS TUNING THE ANTENNA FOR OPTIMUM S.W.R..
TABLE OF CONTENTS PAGE SPECIFICATIONS... 2 INSTALLATION... 3 LOCATION... 3 CON NEX - 4300HP MOUNTING THE RADIO... 3 IGNITION NOISE INTERFERENCE... 4 ANTENNA... 4 TUNING THE ANTENNA FOR OPTIMUM S.W.R..
More informationThe Impact of Broadband PLC Over VDSL2 Inside The Home Environment
The Impact of Broadband PLC Over VDSL2 Inside The Home Environment Mussa Bshara and Leo Van Biesen line Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium Tel: +32 (0)2 629.29.46, Fax: +32
More informationAmateur Radio Examination Intermediate Level
Amateur Radio Examination Intermediate Level Candidate: Candidate DoB: Centre: Exam Date: This paper consists of 45 questions Time Allowed: 1 hour 25 minutes. Candidate Declaration. I confirm that this
More informationFCC Technician License Course
FCC Technician License Course 2014-2018 FCC Element 2 Technician Class Question Pool Presented by: Tamiami Amateur Radio Club (TARC) WELCOME To the third of 4, 3-hour classes presented by TARC to prepare
More informationCentral Electronics Model 600L Linear Amplifier
INTRODUCTION This manual has been reproduced by James Lawrence, NA5RC, a 600L owner. Text no longer applicable such as insurance claim with the carrier has been deleted. Some capitalization and grammar
More informationKilling RF Noise for Field Day and CQP. Jim Brown, K9YC
Killing RF Noise for Field Day and CQP Jim Brown, K9YC The Fundamental Problem RF noise is generated inside equipment The wires inside equipment, and cables that interconnect equipment, are antennas, and
More informationBead RF Chokes. By: Igor Grigorov, VA3ZNW, Richmond Hill, Canada
By: Igor Grigorov, VA3ZNW, Richmond Hill, Canada Recently there are lots devices that contained some RF sensitive or vice versa RF generation parts inside. It is power AC/DC converters (aka power supply),
More informationLocate and minimize those nasty RFI problems while transmitting or receiving on HF or VHF
RFI in the Ham Shack - Tips and Traps Radio Frequency Interference Locate and minimize those nasty RFI problems while transmitting or receiving on HF or VHF Rick Lapp, KC2FD Typical RFI Problems while
More informationLocate and minimize those nasty RFI problems while transmitting or receiving on HF or VHF
RFI in the Ham Shack Tips, Tricks and Traps Radio Frequency Interference Locate and minimize those nasty RFI problems while transmitting or receiving on HF or VHF Rick Lapp, KC2FD rick@ricklapp.net Typical
More informationRF (RADIO FREQUENCY) WIRELESS PENDANT
NOTE: The following information is an addition to the Operation section in the lift system owner s manual. It describes the RF wireless pendant for your lift system. You must read the lift system owner
More informationTechnician Licensing Class T9
Technician Licensing Class T9 Amateur Radio Course Monroe EMS Building Monroe, Utah January 11/18, 2014 January 22, 2014 Testing Session Valid dates: July 1, 2010 June 30, 2014 Amateur Radio Technician
More informationSOME USES FOR RF1,RF5 and VA1 ANALYSTS. SWR Measurement
SOME USES FOR RF1,RF5 and VA1 ANALYSTS THE HANDIEST INSTRUMENTS IN DECADES! When you put up an antenna in the the old days, it could be a real struggle. The only way to tell if it was tuned to the right
More informationTechnician License Course Chapter 2. Lesson Plan Module 2 Radio Signals and Waves
Technician License Course Chapter 2 Lesson Plan Module 2 Radio Signals and Waves The Basic Radio Station What Happens During Radio Communication? Transmitting (sending a signal): Information (voice, data,
More informationCUTTING THROUGH... RADIO INTERFERENCE
Aussi disponible en français. 32-EN-95539W-01 Minister of Supply and Services Canada 1996 CUTTING THROUGH... RADIO INTERFERENCE THE COMMUNICATIONS AGE In recent years, the proliferation of transmitters,
More informationDo I need a signal booster?
Do I need a signal booster? Signal amplifiers most commonly masthead and distribution amplifiers are sometimes used in television systems to increase the level (strength) of signals received at a television
More information4/25/2012. Supplement T9. 2 Exam Questions, 2 Groups. Amateur Radio Technician Class T9A: T9A: T9A: T9A:
Amateur Radio Technician Class Element 2 Course Presentation ti ELEMENT 2 SUB-ELEMENTS Technician Licensing Class Supplement T9 Antennas, Feedlines 2 Exam Questions, 2 Groups T1 - FCC Rules, descriptions
More informationAntennas and Propagation Chapters T4, G7, G8 Antenna Fundamentals, More Antenna Types, Feed lines and Measurements, Propagation
Antennas and Propagation Chapters T4, G7, G8 Antenna Fundamentals, More Antenna Types, Feed lines and Measurements, Propagation =============================================================== Antenna Fundamentals
More informationRangeStud Professional Grade FM Transmitter
RangeStud Professional Grade FM Transmitter Package Contents: 1-20W RangeStud FM Transmitter 1-12V 4 A Power Adapter 1-Power Cord 1-Amateur Grade Tunable ¼ Wave FM Antenna + 30 Amateur Grade BNC Male x
More informationTechnician License Course Chapter 3. Lesson Plan Module 7 Types of Radio Circuits
Technician License Course Chapter 3 Lesson Plan Module 7 Types of Radio Circuits The Basic Transceiver Combination of transmitter and receiver Abbreviated XCVR (X = trans) Antenna switched between transmitter
More information15 Meter RFI Generated by the SecureView Wireless Surveillance Camera
15 Meter RFI Generated by the SecureView Wireless Surveillance Camera Greg Ordy, W8WWV, ordy@seed-solutions.com May 1, 2008 Version 1.5 Overview The SecureView wireless surveillance camera has been discovered
More informationTechnician License. Course
Technician License Course Technician License Course Chapter 4 Lesson Plan Module - 9 Antenna Fundamentals Feed Lines & SWR The Antenna System The Antenna System Antenna: Transforms current into radio waves
More informationS ENSORLINK INSTALLATION MANUAL
S ENSORLINK INSTALLATION MANUAL The SensorLink Transmitter (#7610) and SensorLink Receiver (#7611) are designed to work with Davis Instruments Weather Monitor II and the Weather Wizard III to enable wireless
More informationTest Equipment. PHYS 401 Physics of Ham Radio
Test Equipment Voltmeter - an instrument that is used to measure voltage. It is used in parallel with a circuit to be measured. a series resistor extends the range of the meter. Ammeter - an instrument
More informationTechnician License Course Chapter 2. Lesson Plan Module 3 Modulation and Bandwidth
Technician License Course Chapter 2 Lesson Plan Module 3 Modulation and Bandwidth The Basic Radio Station What Happens During Radio Communication? Transmitting (sending a signal): Information (voice, data,
More informationRadio Receivers. Al Penney VO1NO
Radio Receivers Al Penney VO1NO Role of the Receiver The Antenna must capture the radio wave. The desired frequency must be selected from all the EM waves captured by the antenna. The selected signal is
More information2/1/13 8:42 AM. 1. I checked all the phone line connections, and rewired a few spots that appeared to be flakey. No improvement was noted.
RFI I quickly found when I went to 1000 watts on 160 and 75 meters that my telephones were susceptible to fairly significant RFI problems. It was bad enough that the kitchen phone with the built-in digital
More informationRadio Receivers. Al Penney VO1NO
Radio Receivers Role of the Receiver The Antenna must capture the radio wave. The desired frequency must be selected from all the EM waves captured by the antenna. The selected signal is usually very weak
More informationTechnician License Course Chapter 5. Lesson Plan Module 11 Transmitters, Receivers and Transceivers
Technician License Course Chapter 5 Lesson Plan Module 11 Transmitters, Receivers and Transceivers Generalized Transceiver Categories Mobile Single Band Dual Band All Band Multimode Handheld (HT) VHF/UHF
More informationTechnician License Course Chapter 4. Lesson Plan Module 10 Practical Antennas
Technician License Course Chapter 4 Lesson Plan Module 10 Practical Antennas The Dipole Most basic antenna Total length is ½ wavelength (½ λ) Usual construction: Two equal halves of wire, rod, or tubing
More informationAmateur Radio Examination Foundation Level
Amateur Radio Examination Foundation Level Candidate: Candidate DoB: Centre: Exam Date: This paper consists of 26 questions Time Allowed: 55 minutes. Candidate Declaration. I confirm that this is all my
More informationReport Demonstration Field Test
Report Demonstration Field Test The device under test: Genesys Resonant Active Tunable (GRAT) antenna Designer-owner: GENESYS LTD Model code name: GRAT-C-27V3 Device Purpose: RF Transmitting-Receiving
More informationBob Brehm, AK6R Chief Engineer Palomar-Engineers.com
Bob Brehm, AK6R Chief Engineer Palomar-Engineers.com HAMCON 2017 - September 2017 This presentation available on website Copyright 2013-2017 Palomar Engineers, Inc. End Fed Workshop Topics Popular End
More informationRFI - Intermodulation
RFI - Intermodulation By Ed Hare, W1RFI w1rfi@arrl.org What Is Intermod? All Radios Are Not Created Equal! External Filters External IMD A 2-Meter Notch Filter You Can Build Some old-time hams remember
More informationCOOLTUBE Radiated Emissions Absorber
COOLTUBE Radiated Emissions Absorber Radiated Emissions Solution from MH&W International Corp. Radiated Emissions In VFD Motor Systems 1. Defining the problem 2. Solutions 2 What is EMI? What Are Emissions?
More informationRemote Control Extender AUDIO / VIDEO DEVICES EXTENDING SYSTEM
Remote Control Extender AUDIO / VIDEO DEVICES EXTENDING SYSTEM MODEL NO.: AWX 701-A/AWX 701-B/AWX 701-C OPERATION MANUAL Remote Control Extender AUDIO / VIDEO DEVICES EXTENDING SYSTEM MODEL NO.: AWX 701-A/AWX
More informationSUPERHETERODYNE RECEIVER DUAL Conversion SUPERHETERODYNE RECEIVER
SUPERHETERODYNE RECEIVER SUPERHETERODYNE RECEIVER DUAL Conversion 146 MHz Image 102.4 MHz Radio Frequency Amplifier Optional Mixer Oscillator Wide Filter 1 st Intermediate Frequency Amplifier 21.8 MHz
More informationBlack Oak / Light Oak / Cherrywood Wireless Panel Speaker
4015115/4015116/4015117 Black Oak / Light Oak / Cherrywood Wireless Panel Speaker With Infrared Remote Control USER GUIDE For use with: Introduction These 900 MHz stereo wireless speaker system uses the
More informationTechnician Class Course. Session 1
Technician Class Course Session 1 WHAT IS AMATEUR RADIO? What is Amateur Radio? Amateur (or Ham) Radio is a personal radio service authorized by the Federal Communications Commission (FCC). To encourage
More informationBob Brehm, AK6R Chief Engineer Palomar-Engineers.com
Bob Brehm, AK6R Chief Engineer Palomar-Engineers.com LAKESIDE - October 2017 This presentation available on website Copyright 2013-2017 Palomar Engineers, Inc. End Fed Workshop Topics Popular End Fed Antenna
More informationAntenna Design for FM-02
Antenna Design for FM-02 I recently received my FM-02 FM transmitter which I purchased from WLC. I researched the forum on what antennas where being used by the DIY community and found a nice write-up
More informationAUDIO SYSTEM DESCRIPTION
BE86 DESCRIPTION 1. RADIO WAVE BAND BE0AX03 The radio wave bands used in radio broadcasting are as follows: Frequency Designation 30 khz 300 khz 3 MHz 30 MHz 300 MHz LF MF HF VHF Radio wave FM Modulation
More informationR-600A Telemetry Receiver Operating Manual
R-600A Telemetry Receiver Operating Manual NEW R-600A FEATURES COVERS THE ENTIRE 216.000-222.000MHz BAND IN 1kHz STEPS FOR QUICK AND ACCURATE FREQUENCY SELECTION SUPER SELECTIVE 8 POLE SSB CRYSTAL FILTER
More informationAmateur Radio License. Safety
Amateur Radio License Safety Exam 35 questions, you have to get 26 right There will be multiple exams available, you can try again immediately There will also be General (and Extra!) class tests if you
More informationMFJ-752C SIGNAL ENHANCER II
MFJ-752C SIGNAL ENHANCER II INTRODUCTION The improved MFJ-752C SIGNAL ENHANCER II is comprised of two tunable audio filtering systems designed to clarity and remove interfering signals from both voice
More informationMITIGATING INTERFERENCE ON AN OUTDOOR RANGE
MITIGATING INTERFERENCE ON AN OUTDOOR RANGE Roger Dygert MI Technologies Suwanee, GA 30024 rdygert@mi-technologies.com ABSTRACT Making measurements on an outdoor range can be challenging for many reasons,
More informationMARTIN - G8JNJ ECLECTIC AETHER - ADVENTURES WITH AMATEUR RADIO
MARTIN - G8JNJ ECLECTIC AETHER - ADVENTURES WITH AMATEUR RADIO REDUCING RTL DONGLE INTERNAL SPURII AND NOISE SIGNALS I ve recently bought quite a few RTL DVB-T RTL 2832U / Rafael Micro R820T dongles to
More informationPro Audio Eng PAE-Kx33 AC Power Supply
Pro Audio Eng PAE-Kx33 AC Power Supply for the Elecraft KX3 Transceiver (and others w/ adapter) Owner s Manual Rev 1.5 February 20, 2015 Thank you for purchasing the PAE-Kx33 AC Power Supply. We originally
More informationNewcomers And Elmers Net: Wire Antennas Robert AK3Q
Newcomers And Elmers Net: Wire Antennas 02-07-16 Robert AK3Q Wire antennas represent one of the greatest values in the radio hobby world. For less than the cost of a good meal out on the town you can buy
More informationArqiva DAB Car receiver tests in the UK
Arqiva DAB Car receiver tests in the UK Phil Brown 18 October 2018 1 Arqiva DAB Car receiver tests in the UK Topics: Introduction Car antenna pattern measurement Testing potential interfering sources in
More informationMAINTAINING OPTIMAL ALARM MONITORING COMMUNICATION
MAINTAINING OPTIMAL ALARM MONITORING COMMUNICATION 1. VHF RADIO FREQUENCY PRIVATELY OWNED NETWORKS Optimal communication from outstations to the control room is crucial to provide a reliable monitoring
More informationAmateur Radio Technician Class License Study Guide
Amateur Radio Technician Class License Study Guide For use July 1, 2006 to June 30, 2010 Compliments of: Earl Paazig N8KBR Yolo County ARES Amateur Radio Technician Class License Study Guide (For use July
More informationAPPLICATION NOTE. System Design for RF Immunity
APPLICATION NOTE System Design for RF Immunity Audio Codec Application Note Rev1.0 Page 1 of 6 March 2008 With the growth of the portable electronic devices industry, radiated RF fields and potential interference
More informationTechnician License Course Chapter 3 Operating Station Equipment. Transmitters, Receivers and Transceivers PHYS 401 P. Reiff 2009
Technician License Course Chapter 3 Operating Station Equipment Transmitters, Receivers and Transceivers PHYS 401 P. Reiff 2009 Generalized Transceiver Categories Single Band Dual Band Multi-mode Multi-band
More information4/29/2012. General Class Element 3 Course Presentation. Ant Antennas as. Subelement G9. 4 Exam Questions, 4 Groups
General Class Element 3 Course Presentation ti ELEMENT 3 SUB ELEMENTS General Licensing Class Subelement G9 Antennas and Feedlines 4 Exam Questions, 4 Groups G1 Commission s Rules G2 Operating Procedures
More informationUH45 Series. UHF CB Transceiver. For more exciting new products please visit our website: Australia:
UH45 Series UHF CB Transceiver For more exciting new products please visit our website: Australia: www.uniden.com.au Controls & Indicators Included in your Package UH45 Series Radio Operating Guide Belt
More informationRadio Station Setup and Electrical Principles
Radio Station Setup and Electrical Principles Covers sections: T4A-T5D Seth Price, N3MRA February 20, 2016 Outline 4.1 Station Setup 4.2 Operating Controls 4.3 Electronic Principles 4.4 Ohm s Law 4.5 Power
More informationANC-4. ANTENNA NOISE CANCELLER for Reducing Locally-Generated Noise. Instruction Manual
ANC-4 ANTENNA NOISE CANCELLER for Reducing Locally-Generated Noise Instruction Manual Revision 2.0 May 2, 2000 WARRANTY WHO IS COVERED WHAT WE WILL DO WHAT YOU MUST DO WHAT IS NOT COVERED SERVICE WARRANTY
More informationHidden Transmitter Hunting. Dale Hunt WB6BYU
Hidden Transmitter Hunting Dale Hunt WB6BYU Introduction What is Transmitter Hunting? Why would we want to do it? ELT searches Locating sources of interference Locating balloon / rocket payloads Fun /
More informationSWL Receiving Antenna Experiments
SWL Receiving Antenna Experiments Introduction I have a lot to learn about SWL antennas. What follows are some brief experiments I performed in late October 2005. I have been experimenting with a half
More informationTechnician License. Course
Technician License Course Technician License Course Chapter 4 Lesson Plan Module - 10 Practical Antennas The Dipole Most basic antenna The Dipole Most basic antenna The Dipole Total length is ½ wavelength
More informationCHASING ELECTRICAL NOISE. The single most vexing challenge in troubleshooting..
CHASING ELECTRICAL NOISE The single most vexing challenge in troubleshooting.. The Goal Here To give you the tools you need to methodically troubleshoot electrical noise. Why do we care? YOU CAN CRASH
More informationBob Brehm, AK6R Chief Engineer Palomar-Engineers.com. Copyright 2015 Palomar Engineers, Inc.
Bob Brehm, AK6R Chief Engineer Palomar-Engineers.com Copyright 2015 Palomar Engineers, Inc. RFI Workshop Objectives Review fundamentals of Common Mode Noise How ferrites work to suppress Common Mode noise
More informationLesson 4: Frequencies & Privileges
Lesson 4: Frequencies & Privileges Preparation for Amateur Radio Technician Class Exam Topics Frequency limits Frequencies and Wavelengths Band Sharing Operating Guidelines Emission Types Technician Frequency
More informationSP GHz Digital Wireless Speakers. User s Manual. Please read before using the equipment. Please visit for details.
SP1390 2.4GHz Digital Wireless Speakers User s Manual Please read before using the equipment. Please visit www.promowide.com for details. INTRODUCTION This 2.4G digital wireless speakers system uses latest
More informationx12 BATTERIES INCLUDED
AGES 8+ 13744 x12 BATTERIES INCLUDED Replace with 12 x 1.5V AA or R6 size alkaline batteries. Phillips/cross head screwdriver (not included) needed to replace batteries. Standard, CRT TV only. Not for
More informationBob Brehm, AK6R Chief Engineer Palomar-Engineers.com. PVARC April Copyright 2016 Palomar Engineers, Inc.
Bob Brehm, AK6R Chief Engineer Palomar-Engineers.com PVARC April 2016 Copyright 2016 Palomar Engineers, Inc. Causing Neighborhood RFI? IT S ALL YOUR FAULT WITH THAT BIG ANTENNA! Receiving RFI from Neighborhood?
More informationGETTING THE MOST FROM YOUR HF TRANSCEIVER FRED KEMMERER, AB1OC JANUARY 10 TH, 2017
GETTING THE MOST FROM YOUR HF TRANSCEIVER FRED KEMMERER, AB1OC JANUARY 10 TH, 2017 Topics Its mostly about the receiver Transmitter/amplifier operation tips and tricks Common operating scenarios Not to
More informationTechnician License Course Chapter 3 Types of Radios and Radio Circuits. Module 7
Technician License Course Chapter 3 Types of Radios and Radio Circuits Module 7 Radio Block Diagrams Radio Circuits can be shown as functional blocks connected together. Knowing the description of common
More informationGetting Into Ham Radio
There are 2 million amateur radio operators world wide of which 735 thousand are in the United States The Cuyahoga Falls Amateur Radio Club would like to welcome you to amateur (Ham) radio. 2 World wide
More informationGuidance and Declaration - Electromagnetic Compatibility (EMC) for the Delfi PTS ii Portable Tourniquet System
Guidance and Declaration - Electromagnetic Compatibility (EMC) for the Delfi TS ii ortable Tourniquet System Guidance and manufacturer s declaration electromagnetic emissions The TS ii ortable Tourniquet
More informationIEM 200 R UHF receiver. user manual
IEM 200 R UHF receiver user manual Musikhaus Thomann Thomann GmbH Hans-Thomann-Straße 1 96138 Burgebrach Germany Telephone: +49 (0) 9546 9223-0 E-mail: info@thomann.de Internet: www.thomann.de 17.11.2015,
More informationGeneral Licensing Class Circuits
General Licensing Class Circuits Valid July 1, 2011 Through June 30, 2015 1 Amateur Radio General Class Element 3 Course Presentation ELEMENT 3 SUB-ELEMENTS (Groupings) Your Passing CSCE Your New General
More informationClass-D Audio Power Amplifiers: PCB Layout For Audio Quality, EMC & Thermal Success (Home Entertainment Devices)
Class-D Audio Power Amplifiers: PCB Layout For Audio Quality, EMC & Thermal Success (Home Entertainment Devices) Stephen Crump http://e2e.ti.com Audio Power Amplifier Applications Audio and Imaging Products
More informationQUICK REFERENCE GUIDE
QUICK REFERENCE GUIDE Installation 1. Install a ground system for DC noise suppression and RFI suppression 2. Install your DC power supply 3. Install lightning protection. This will help protect more than
More informationBiological Safety. Electromagnetic Compatibility (EMC) Observe the following precautions related to biological safety.
Biological Safety Observe the following precautions related to biological safety. WARNING: Non-medical (commercial) grade peripheral monitors have not been verified or validated by SonoSite as being suitable
More informationWHY YOU NEED A CURRENT BALUN
HF OPERATORS WHY YOU NEED A CURRENT BALUN by John White VA7JW NSARC HF Operators 1 What is a Balun? A BALUN is a device typically inserted at the feed point of a dipole-like antenna wire dipoles, Yagi
More informationRegister your product and get support at. SDV7220/12. User manual
Register your product and get support at www.philips.com/welcome SDV7220/12 User manual Contents 1 Important 4 Safety 4 Recycling 4 English 2 Your SDV7220/12 5 Overview 5 3 Get started 6 Installation
More informationThe No-Nonsense, No-Code Technician Class License Study Guide
The No-Nonsense, No-Code Technician Class License Study Guide (for tests given after July 1, 2006) Dan Romanchik KB6NU NOT FOR SALE!! What is amateur (ham) radio? Amateur radio, also known as ham radio,
More informationSEARCH LITE OPERATION MANUAL
SEARCH LITE OPERATION MANUAL Corporate Profile Trilithic, Inc. was founded in 1986 as an engineering and assembly company providing customized communications and routing systems for business and government
More informationThe PRC-2090 base docking station incorporates the PRC-2090 vehicle docking station plus an AC Power supply module P/N
Base Docking Station Introduction The PRC-2090 base docking station incorporates the PRC-2090 vehicle docking station plus an AC Power supply module P/N 2090-06-01. A MIL-STD high speed HF Modem (P/N 2090-04-10)
More informationThis information is available in a series of brochures, a videocassette and a CD-ROM. The Industry Canada Internet site
This information is available in a series of brochures, a videocassette and a CD-ROM. The Industry Canada Internet site http://strategis.ic.gc.ca, under the heading Marketplace Services includes useful
More informationModule 8 Theory. dbs AM Detector Ring Modulator Receiver Chain. Functional Blocks Parameters. IRTS Region 4
Module 8 Theory dbs AM Detector Ring Modulator Receiver Chain Functional Blocks Parameters Decibel (db) The term db or decibel is a relative unit of measurement used frequently in electronic communications
More informationReading and working through Learn Networking Basics before this document will help you with some of the concepts used in wireless networks.
Networking Learn Wireless Basics Introduction This document covers the basics of how wireless technology works, and how it is used to create networks. Wireless technology is used in many types of communication.
More informationTechnician Licensing Class. Lesson 4. presented by the Arlington Radio Public Service Club Arlington County, Virginia
Technician Licensing Class Lesson 4 presented by the Arlington Radio Public Service Club Arlington County, Virginia 1 Quiz Sub elements T6 & T7 2 Good Engineering Practice Sub element T8 3 A Basic Station
More information