Fleeman, Anderson & Bird, Corp.
 

       Home Terms & Conditions
   Contact our staff     About FAB Corp   

        Recover your password    Support





 

 Categories 
  Access Points, Bridges & Routers

  Bi-directional Amplifiers

  Power Over Ethernet 802.3af POE

  Power Splitters

  Antennas

  Cantenna Kits

  Weather Proofing

  Mounts

  Enclosures

  Lightning Protection and Grounding

  Wire Ties and Heat Shrink

  Cables longer than 5 feet : Jumpers

  Cables shorter than 5 feet : Pigtails

  Coax Cable

  Coax Connectors and Adapters

  Installation Tools & Accessories

  Category 5e / 6

  THE BASEMENT

 


 Manufacturers 
  Coax-Seal
  Comet
  Tycon Systems
  Polyphaser
  Times Microwave Systems
 


 Help 
  Recover your password
  Contact our staff
  Privacy statement
  Terms & Conditions
  dB to Watt Table & Limits
  Losses & Gains per dB
  What Is Radio Line Of Sight
  What connector do I have?
  Connector Cable Groups
  Our Shipping Q&A

 


 
Losses & Gains per dB
 

Percentage of lost or gained signal per dB


dB Change
% Change
 
dB Change
% Change
 
dB Change
% Change
0.1
2.28
 
1.7
32.4
 
3.3
53.2
0.2
4.50
 
1.8
33.9
 
3.4
54.3
0.3
6.67
 
1.9
35.4
 
3.5
55.3
0.4
8.80
 
2.0
36.9
 
4.0
60.2
0.5
10.9
 
2.1
38.3
 
5.0
68.4
0.6
12.9
 
2.2
39.7
 
6.0
74.9
0.7
14.9
 
2.3
41.1
 
7.0
80.0
0.8
16.8
 
2.4
42.5
 
8.0
84.2
0.9
18.8
 
2.5
43.8
 
9.0
87.4
1.0
20.6
 
2.6
45.0
 
10.0
90.0
1.1
22.4
 
2.7
46.3
 
11.0
92.1
1.2
24.1
 
2.8
47.5
 
12.0
93.7
1.3
25.9
 
2.9
48.7
 
13.0
95.0
1.4
27.6
 
3.0
49.9
 
14.0
96.0
1.5
29.2
 
3.1
51.0
 
15.0
96.8
1.6
30.8
 
3.2
52.1
 
20.0
99.0

This table is designed to help you visualize what changes in dB signal level does in a RF system. The dB change listed above can be reflected as either loss between the radio/transmitter and the antenna, or gain in amplification and antenna. Let's break these two down:

System Gains

  • Every 1dB of gain raises your output power 20%, where 3dB doubles output power.

  • Antenna gain is a function of size, no matter what design it is. A small antenna that claims unreasonably high gain will not perform as you expect it to. All of the antennas we stock have been tested on a Anritsu antenna analyzer to verify the manufactures rating.

System Losses
  • Every 1dB of loss in the system represent a full 20% -loss- of power. Just as in gain, 3dB of loss represents a loss of 50% of your power.

  • LMR400 has 6.6dB per 100ft, so keep your runs as short as possible.

  • All losses are cumulative, so every element of your system has to be accounted for... Pigtails, coax runs, lightning protectors, etc all have to be added up to get the full view of overall loss.


As you can see, even the smallest change makes a radical difference.

Keep this table in mind when selecting the grade of cable and other items in the system you are building. You can also use our dB to Watt Table to help keep your system in check with FCC regulations regarding power output. If you have more questions or concerns, just contact us, we're more than happy to help.

 
 

 Search 
      
Advanced search    

 


 Your cart 
Cart is empty
  View cart
  Checkout
 


 Authentication 
Secure user login
            New User

 



 News 
04/13/2017
IMPORTANT NOTICE:

Over the next several weeks, to couple of months, we will be completely reworking our entire web presence.

There will be several items not listed that we do sell. There may be items still listed that we may not sell actively but still have access to in a drop ship fashion. Please feel free to call 727-753-9110 Monday - Friday 9 am - 5 pm, closed for lunch 12 noon until 1:30 pm eastern daylight savings time. If you receive voice mail, please leave a message. Your call will be returned within the same day if it is received before lunch. If after lunch, every effort will be made to return the call the same day, but it may be the next business day.

Several new exciting products are on the horizon for FAB Corp. Also, several products that we have been selling, will also be discontinued. Be on the look out for "fire sales" or extremely discounted items that we are closing out of. Some manufacturers may have only some items we close out but we will keep others. If you have a question about anything we are doing or working on, please send a message to sales@fab-corp.com

Previous news




Subscribe to site news 
 

Your order secured by SSL.
256bit TLS also supported!



We accept....



Have any Questions? Send us an E-mail
Copyright © 2001-2017 Fleeman, Anderson & Bird Corp.