Antenna Handbook | Best Antennas, Free Calculators & Top Antenna Deals

rf bnc 50 ohm attenuator

rf bnc 50 ohm attenuator
rf bnc 50 ohm attenuator


rf bnc 50 ohm attenuator

Attenuators - Interconnects PADS BNC 50 OHM BNC(M) (F) 20db - 

Is 20db enough attenuation to reduce 1W output to 0.5W ? 
20dB for this attenuator provides drop of voltage 10 times into 50 Ohms load. The power which is V^2/R will drop 100 times accordingly . The difference between 1 watt and 0.5 watts is 3 db. A 20 db attenuation is 1/100. 1 watt input gives 0.01 watt output. It will reduce your 1 Watt to .01 Watt. If you really need 0.5 Watt , then you need a 3 DB attenuator. It goes loke this: 3 db = half the power; 6 db = one fourth the power; 9 db = one eighth of the power; 10 db = one tenth of the power; 20 db = one one-hundreth of the power.  Said another way: for every 3 db of attenuation reduce the power by one-half. For every 10 db reduce the power by a factor of ten A 3db drop is half power.

What's the working frequency range of this attenuator? I need one working between 0.5 and 3 MHz with minimal distortion of the waveform.
I use them on 490MHz all the way to 875MHz, don't see distortion on waveform but I mainly use them to drop the signal so I don't overload enritsu or pathtrax. 

What is the maximum power input in Watts for this attenuator?
Max power input isn't indicated on the attenuator itself, but I've been running 1/2W through it without any problems so far.

will this attenuator work @ 30mhz and below ? I want to attenuate the input on a spectrum analyzer for use on the HF bands
You are looking at a resistive Attenuator. Should work all the way down to DC as long as you keep the power level low. At the upper frequency range you are limited by the BNC connection but should be good to 1GHZ.


Find The Best Guide to Indoor and Outdoor TV Antennas


Indoor Antennas for receiving DTV 

(Note: An auction of spectrum that had been licensed to broadcast television stations operating on UHF TV Channels 38-51 resulted in many TV stations on these channels transitioning to other channels. Almost all of the TV stations affected finished transitioning in July 2020.) 

To receive DTV signals from all stations in the area, your antenna needs to be able to receive both VHF channels (channels 2-13) and UHF channels (channels 14-36). 

Some antennas only provide good reception of VHF or UHF channels, but not both. For example, indoor "rabbit ears" usually need to be augmented with an additional "wire loop" or "bowtie" antenna (see images on the next page) in order to pick up signals on UHF channels. 

Many of the antennas being sold as "HDTV Antennas" perform best at receiving UHF signals, but perform less well receiving VHF channels. Check with retail consultants and consumer websites to make sure that any antenna you choose provides good reception of both VHF and UHF channels. 

Even if you use a digital-to-analog converter box, you will still need to use an antenna to receive DTV signals. Digital-to-analog converter boxes do not contain additional antennas or signal amplification.

Antennas for reception in different signal conditions 


The antennas on the next page will work for the indicated signal strength in most instances, but may not work in all cases. 


The type of antenna needed at a specific location may vary depending on geographic location, the height at which the antenna is used and other local factors such as nearby buildings, trees, terrain or home construction. 

Generally, outdoor antennas will get better reception than indoor antennas and are strongly recommended for the most reliable reception.

If your home near the TV Broadcasting Station and not much blocking obstacles such high building and the TV signals is Strong Use Circular Loop and Dipole Antenna such Rabbit Ears Antenna. 


Best Practical Antenna HandBook by joseph J. Carr for Hobbyist, Students, and DIYers

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Practical Antenna HandBook 5/e 5th Edition - This Book is a practical antenna handbook ,by Joseph J. Carr , a book that explains antennas in terms of theory and practical examples to apply, suitable for Hobbyist, Students, and DIYers. Practical Antenna Handbook is a thick volume that tries - mostly successfully - to balance technical detail against practicality.


The most popular book on antennas ever written and unquestionably the world's favorite antenna book, Joseph J. Carr's Practical Antenna Handbook, fourth Edition and Fifth Edition. 

Joseph J. Carr  

Is was a military electronics technician and the author of several popular electronics books, including McGraw-Hill’s Secrets of RF Design, Third Edition and Old Time Radios! Restoration and Repair. He wrote a monthly column for Nuts & Volts magazine.
 

George W. (Bud) Hippisley,

Is  W2RU, earned his BSEE degree from MIT, and was formerly chief operating officer for a major supplier of electronics to the cable TV industry. A long-time active amateur radio operator who has won or ranked nationally in many competitive on-the-air operating events, he has given talks on the basics of antennas and ionospheric propagation to radio clubs and other groups for more than 35 years.

Several article from Practical Antenna Handbook you can find in this blog, and this This intended to let the reader knows the contents of this book, this book combines theory and practice very well and clearly, suitable for hobbyists, scientists, college students, or anyone interested in antenna

In this book you will learn about Introduction to radio communication, radio wave propagation, Antenna Basics , dipole antenna, standing waves antenna, transmission lines, impedance matching, Antenna Arrays, Antenna Gains, High frequency Antennas, Wire Loop Antennas, Multiband Antenna , Tune able Antenna, Wire Antenna, Yagi Uda Antenna, Microwave Antenna, Mobile Antenna, Marine Antenna, VHF Antenna, UHF Antenna, Smith Chart, Antenna Software , Tower Antenna and etc. 


The ARRL Antenna Book for Radio Communications has everything you need to design your own complete antenna system. Since 1939, it has maintained its place at the forefront of Amateur Radio technology a single resource covering antenna theory, design and construction, and practical treatments and projects. In this edition, The ARRL Antenna Book describes hundreds of antenna designs: wire, vertical, portable and mobile, and new high-performance VHF/UHF Yagi designs.

Radio amateurs continue to make contributions to the state of the art in antenna design and construction. The available tools have grown in sophistication by leaps 
and bounds over the past years. Antenna modeling with the low-cost or free programs available to amateurs has completely changed antenna design and development. 
A large set of antenna models designed for use with EZNEC 6.0 demo software is included.

Updated to reflect the latest advances and technologies, this 23rd edition is full of antenna designs pioneered by dozens of radio amateurs:

New Projects: Multiband HF antennas from 160 through 10 meters, A simple omnidirectional satellite antenna system, More popular Moxon antenna projects on CD-ROM, 
Stealthy and portable antenna designs for home and away.



Radio Experimentation, Discovery, and Achievement. The ARRL Handbook for Radio Communications is a complete reference and guide to radio technology principles and practices. Since 1926, The ARRL Handbook has been a trustworthy source of introductory, applied, and theoretical information. 

Now in its 96th edition The Handbook continues to advance the pursuit of experimentation and innovation by radio amateurs and professionals. Each edition contains new and useful material to support Amateur Radio activity from the traditional short- and long-wave frequencies through microwaves! Key Topics Radio electronics theory and principles Circuit design and equipment Radio signal transmission and propagation Digital and analog modulation and protocols Antennas and transmission lines Construction practices.

Who reads The Handbook? Amateur Radio operators, or hams; professional wireless communication engineers and system designers; electrical engineers; students and instructors of engineering, physics, and geoscience. 

Always Updated! New Projects and Content Simple SLA Float Charger project by John Boal, K9JEB Amateur Radio Data Platforms by Paul Verhage, KD4STH and Bill Brown, WB8ELK The latest information on WSJT-X digital modes by the WSJT team Filter and circuit design software by Tonne Software and Jim Tonne, W4ENE Low-Noise VHF and UHF Oscillators by Ulrich Rohde, N1UL, and Ajay Poddar, AC2KG Update on Solar Cycle 24 by Carl Luetzelschwab, K9LA Updated SSTV practices and technology by Larry Peterson, WA9TT.

Designing dual-band loaded dipoles by David Birnbaum, K2LYV Latest transceiver survey by Joel Hallas, W1ZR Plus, new component tables, reference articles, material characteristics, and guidelines for SDR design. Download Included: eBook and Supplemental Material Download the fully searchable digital edition of the printed book, as well as expanded supplemental content, software, PC board templates, and other support files.

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The Best Homebrew vertical antenna 40m band from YC2YIZ


Homebrew vertical antenna 40m band - To determine how much tubing we will need, we have to figure out how long a quarter wave is at forty meters . Using λ/4 (feet) = 246/f (MHz) and then converting the fraction of a foot which remains to inches, we get λ/4 = 33,10 inches for a center frequency of 7,265 MHz. Any center frequency can be chosen by placing that frequency in place of f in the formula.
This homebrew vertical antenna 40m band from Edy Karsono (YC2YIZ) , this antenna also work for 15m band, beside 40m band. Edy used MFJ analyzer to measure the SWR. 


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RAM                         ‎              16 GB LPDDR4
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Card Description                        ‎Integrated
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Processor Brand        ‎               Intel
Processor Count                 ‎      1
Flash Memory Size                      256
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Processor                 ‎                2.4 GHz apple_ci5
RAM                         ‎                8 GB LPDDR4
Hard Drive                 ‎                SSD
Chipset Brand                         ‎Intel
Card Description                         ‎Integrated
Wireless Type                         Bluetooth, 802.11ax
Number of USB 2.0 Ports         ‎3
Average Battery Life (in hours) ‎10 Hours

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