YOUR CART 0 items 
    
2017-05-27
   
Hot Search:  FOR BAOFENG UV-5R  1020SURECOM  pb34  Keypad for UV-5R  Baofeng MIN  41 30k  ap-100  Nagoya uv 3 r  ic-t81  TSSD TS-D8800R  LED swr metre  ht plug  xinhe radio  tyt th8600  softcase MD380  
Code/Search:    Home  |   All Products  |   FAQ's  |   PAY Method  |   Shipping   |   My Address   |   Contact Us
  Hot News - What is dummy load ?

In radio this device is also known as a dummy antenna or a radio frequency termination. It is a device, usually a resistor, used in place of an antenna to aid in testing a radio transmitter. It is substituted for the antenna while adjusting the transmitter, so that no radio waves are radiated, so that the transmitter does not interfere with other radio transmitters during the adjustments.[1] If a transmitter is tested without a load attached to its output terminals such as an antenna or a dummy load, the power will be reflected back into the transmitter, often overheating and damaging it. Also, if a transmitter is adjusted without a load, it will operate differently as compared with a load, and the adjustments may be incorrect.

The dummy load ordinarily should be a pure resistance; the amount of resistance should be the same as the impedance of the antenna or transmission line that is used with the transmitter (usually 50 Ω or 75 Ω).[2] The radio energy that is absorbed by the dummy load is converted to heat. A dummy load must be chosen or designed to tolerate the amount of power that can be delivered by the transmitter.[3] Typically it consists of a resistor attached to some type of heat sink to dissipate the power from the transmitter.

The ideal dummy load provides a standing wave ratio (SWR) of 1:1 at the given impedance.

Veterinarian-grade mineral oil, an inexpensive source for mineral oil, is frequently used by amateur radio operators as coolant in RF dummy loads.

   

Copyright © 2017 409shop walkie talkie All Rights Reserved.    
Surecom_product-line 409shop-site-map 409shop-site-map
Our Company Products Learn & Support Customer Service Partner With Us
Home 2017 COMING SOON  Software Downloads PAY Method Reseller Contact
About Us LED  Technical Support Post Tracking Supplier Contact
My Company DMR Radio FRS Frequency Privacy Policy Affiliate Program
News  Small Mobile FAQ Repair Return Address 寻求供应商
Authority of All   Exchange/Refund/Return Policy Contact Us  
    Tax Policy Free Shipping  
 
Friendly Links            
me-too-online.com daidaisiumui    emori Gift and Premium me-too-online.com me-too-online.com justbuycases
 
www.de-luce.com