w to dbm calculator

the RF signal of the radio transmitters output is transmitted to the antenna via a feeder (cable) and radiated out by the antenna in the form of electromagnetic waves. When the electromagnetic wave arrives at the receiving location, it is received by the antenna (only a small fraction of the power is received) and sent to the radio receiver via the feeder. Therefore, it is very important to calculate the transmitting power of the transmitting device and the radiation ability of the antenna in

Data | Database in many CGI languages, PHP with its simple, rapid advantages began to grow, the use of PHP development program more and more people, and the general PHP database on two types: text and MySQL. Text database reading, writing speed is slow, when the data reaches a certain amount will greatly reduce speed and even crash! While MySQL, although fast, powerful, but not the average amateur love can afford, because the general free space does not support MySQL (a host of friends do not lo

Conversion of wireless power mW and DBM and interpretation of common symbols 1. Conversion of power unit mW and DBM The RF signal output by the radio transmitter is transmitted to the antenna through a feeder (Cable), which emits electromagnetic waves. After the electromagnetic wave arrives at the receiving location, it is received by the antenna (only a small portion of the power is r

Sort | data | Database in many CGI languages, PHP with its simple, rapid advantages began to grow, the use of PHP development program more and more people, and the general PHP database on two types: text and MySQL. Text database reading, writing speed is slow, when the data reaches a certain amount will greatly reduce speed and even crash! While MySQL, although fast, powerful, because the general free space does not support MySQL, because the general free space does not support MySQL (a host of

8. Registration Document REG.PHP3 ? Require ("common.php3"); Require ("mail.php3"); if ($submit) { if ($id = = "") Error ("Please fill in your registered user name!") "); ElseIf (!eregi ("^[0-9a-za_z]+$", $id)) error ("Your username cannot contain other characters!") "); ElseIf ($password = = "") Error ("Please fill in your password!") "); ElseIf ($password ElseIf ($name = = "") Error ("Please fill in your name!") "); ElseIf ($mail = = "") Error ("Please fill in your email address!") "); else{ $

Program 8, registration file Reg.php3 ? Require ("common.php3"); Require ("mail.php3"); if ($submit) { if ($id = = "") Error ("Please fill in your registered user name!") "); ElseIf (!eregi ("^[0-9a-za_z]+$", $id)) error ("Your username cannot contain other characters!") "); ElseIf ($password = = "") Error ("Please fill in your password!") "); ElseIf ($password ElseIf ($name = = "") Error ("Please fill in your name!") "); ElseIf ($mail = = "") Error ("Please fill in your email address!") "); els

The program this alumni originally to our class use, because the server does not have MySQL support, chose dbm There is no dbm program in China, and there is hardly any foreign Spent a night, in the case of scarcely any reference to write out Now publish it. is a very good example of dbm usage 1, INDEX.PHP3 ? if ($login) { ?> ? $

6, log out the document LOGOUT.PHP3 ? Setcookie ("Login", False,time () +31536000); Header ("location:login.php3"); ?> 7, modify the information file Modify.php3 ? Require ("common.php3"); $id = $login; if ($submit) { if ($name = = "") Error ("Please fill in your name!") "); ElseIf ($mail = = "") Error ("Please fill in your email address!") "); else{ $DBM =dbmopen ("Class", "W"); $intro =nl2br ($intro); $data = "$name |!:!| $nickname |!:!| $mail |!:!

DB, which represents a relative value. When calculating A's power compared to b large or small number of db, can be calculated as the formula 10LG A/b. For example: A power is one-fold larger than B power, then 10lg A/b = 2 lg = 3dB, that is, the power of a is greater than the power of B 3dB; If the power of a 46dbm,b is 40dBm, it can be said that a is greater than B 6dB; if the a antenna is 12dBm, b antenna is 14dBm, can say a than B small 2dB. DBM i

PHP + DBM logging program (4) 8. register file reg. php3 Require ("common. php3 "); Require ("mail. php3 "); If ($ submit ){ If ($ id = "") error ("Enter your registered username! "); Elseif (! Eregi ("^ [0-9a-zA_Z] + $", $ id) error ("Your username cannot contain other characters! "); Elseif ($ password = "") error ("enter your password! "); Elseif ($ password Elseif ($ name = "") error ("Enter your name! "); Elseif ($ mail = "") error ("Enter your

Decibel (decibel,db) is a ratio function that operates on dimensionless parameters: DB=˙10LOG10 (x), where x is unitless D B =˙10 l o G Ten (x), where x is unitless dB \dot = Ten log_{10} (x), \quad \text{ Where $x $ is unitless} For example, the amplifier gain is a dimensionless value, which is the ratio of output power to input power: Poutpin=gtherefore Gain in db =10log10g=˙g (DB) P o u t p i n = g therefore Gain in DB = ten l o g ten g =˙g (d B) \frac {P_{out}} {P_{in}} = g \ \text{therefor

In some small python applications, when you do not need a relational database, you can easily use a persistent dictionary to store name-value pairs, which is very similar to the python dictionary, the main difference is data... in some small python applications, you can easily use persistent dictionaries to store name/value pairs without the need for relational databases. it is very similar to the python dictionary, the main difference is that data is read and written on the disk. Another differ

8. Register Reg. php3 Require ("common. php3 "); Require ("mail. php3 "); If ($ submit ){ If ($ id = "") error ("Enter your registered username! "); Elseif (! Eregi ("^ [0-9a-za_z] + $", $ id) error ("your username cannot contain other characters! "); Elseif ($ Password = "") error ("enter your password! "); Elseif ($ password Elseif ($ name = "") error ("enter your name! "); Elseif ($ mail = "") error ("Enter your email address! "); Else { $ DBm = db

This example was originally used for our class. Because the server does not support mysql, dbm is selected.There is no dbm program in China, and there is almost no dbm program abroad.It took me one night to write it out without any reference.Published nowIs a very good dbm use example1. index. php3If ($ login ){?>$

DBMPower Unit and P (Watt) conversion formula:DBM = 30 + 10lgp (P: Tile)First, DB is a pure counting unit: DB = 10 logX. The significance of DB is actually a simple one, that isThe number of large (followed by a long string of 0) or small (followed by a long string of 0) is briefly expressed. For example:X = 1000000000000000 (How many ?) = 10 logX = 150 dBX = 0.000000000000001 = 10 logX =-150 dBDBM defines miliwatt. 0 dBm = 10log1 MW;Dbw defines Watt.

Ec (2); this transcript was originally used for our class. Because the server does not support mysql, we chose DBM, which has no DBM program in China, and almost never spent a night abroad, I wrote it out with almost no reference. It is a very good example of DBM usage. 1. index. PHP3 lt ;? If ($ login ){? Gt script ec (2); script This example was origina

PHP + DBM logging program (3 ). 6. log out of the file logout. php3? Setcookie (login, false, time () + 31536000); header (location: login. php3 );? 7. modify the information file modify. php3? Require (common. php3); $ id $ login; if ($ submit 6. log out of the file logout. php3 Setcookie ("login", false, time () + 31536000 ); Header ("location: login. php3 "); ?> 7. modify the information file modify. php3 Require ("common. php3 "); $ Id = $ logi

This yearbook originally for our class, because the server does not have MySQL support, chose dbm There is no dbm program in China, and there is hardly any foreign Spent an evening in the case of hardly any reference written out Now it's out. is a very good example of dbm usage 1, INDEX.PHP3 if ($login) { ?> Shenzhen Middle School 2000 session

Gdbm is installed by default in most mainstream Linux distributions, but in some distributions, you may need to use the Package Manager to install the corresponding development library. For example In ubuntu, you may need to use the Synaptic Package Manager to install the libgdbm-dev package, because it is generally not installed by default. DBM data block datum is a type defined by typedef statements. It contains at least two members: Void * dptr; Si

6. log out of the logout. php3 file. Setcookie ("login", false, time () + 31536000 ); Header ("Location: Login. php3 "); ?> 7. Modify the information file modify. php3Require ("common. php3 ");$ Id = $ login;If ($ submit ){If ($ name = "") error ("enter your name! ");Elseif ($ mail = "") error ("Enter your email address! ");Else {$ DBm = dbmopen ("class", "W ");$ Intro = nl2br ($ intro );$ DATA = "$ name |! :! | $ Nickname |! :! | $ Mail |! :! | $