Full Answer
What is a stub in a microwave?
In microwave and radio-frequency engineering, a stub or resonant stub is a length of transmission line or waveguide that is connected at one end only. The free end of the stub is either left open-circuit, or short-circuited (as is always the case for waveguides).
What is the stub on a conduit?
STUB – A stub is the length you need for the conduit to reach and is measured from the back of the bend or backside of the conduit. LEG – The remaining length of conduit minus the stub. 5 Steps to Bend a 90 Degree Using 1/2 Inch EMT Conduit
What are the common applications of a stub?
Stubs are commonly used in antenna impedance matching circuits, frequency selective filters, and resonant circuits for UHF electronic oscillators and RF amplifiers .
What is the purpose of a stub in a transformer?
The stub is positioned a distance from the load. This distance is chosen so that at that point the resistive part of the load impedance is made equal to the resistive part of the characteristic impedance by impedance transformer action of the length of the main line.
What is a stub on a conduit?
What is a take up on a 90?
How to bend conduit with one foot?
How to bend a 90 degree bend?
How long is a conduit?
How to make conduit bend plumb?
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How do you bend a stub 90?
0:129:36EMT Bending: 90° Stubs Bent on the Arrow vs. 90° Stubs Bent ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd you make it using the arrow. On your bender. And you would actually put the arrow at a markMoreAnd you make it using the arrow. On your bender. And you would actually put the arrow at a mark seven inches from the end of the conduit. Then you you bend it and you wind up with a twelve inch stub.
What is a stub in conduit?
Excellerate conduit stubs are used as a raceway for systems cabling installation. These stubs are most commonly used for voice/data, fire alarm, building management and surveillance cabling.
How many inches do you deduct for a 90 degree bend?
The most common deducts are 5" for ½" conduit, 6" for ¾" conduit and 8" for a 1" bender. It is a function of the curvature radius of the bender and cannot be changed. The deduct for your bender should be stamped on the bender.
What is a 90 bend?
10:4117:4790 degree Conduit bend - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou put one foot on the pipe. One foot on their heel. And you're going to push down on your foot.MoreYou put one foot on the pipe. One foot on their heel. And you're going to push down on your foot. And pull back on the pipe to get the bend.
What is a stub pipe?
What is Stub-In? In case of a Stub-In, A larger hole is drilled in the Header or Run Pipe and branch pipe whose end is contoured similar to the inside diameter (ID) of the Header is fitted inside the hole.
What is the stub for a 3/4 EMT?
14” stubConsider making a 14” stub, using a 3/4” EMT conduit. Step 1. The IDEAL bender indicates stubs 6” to ↑.
How do you measure a 90 degree bend EMT?
1:256:05How to Make Accurate 90° EMT Stubs with 1/2", 3/4" and 1" EMT ConduitYouTubeStart of suggested clipEnd of suggested clipYou need to subtract off five inches so that'd be 11 inches okay this is a grease pencil it makes aMoreYou need to subtract off five inches so that'd be 11 inches okay this is a grease pencil it makes a nice dark mark. And it cleans off real well all right i'll make a mark at 11 inches.
How many bends are allowed in conduit?
There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes.
How do you measure back to back 90?
0:103:31Conduit Bending BACK to BACK 90's - YouTubeYouTubeStart of suggested clipEnd of suggested clipWe're going to measure out 22 inches we're going to do a 22 inch back to back by doing a 22 inchMoreWe're going to measure out 22 inches we're going to do a 22 inch back to back by doing a 22 inch back to back we're going to use the star to bend our back to back 90. We use the arrow to bend the 90.
What is a 90 degree elbow?
The 90° pipe elbows is used to connect tubes at a 90° angle. As the name suggests, the elbow is always a right-angle in shape. Such type of elbow is also known as "90 bends or 90 ells". This is a pipe fitting device which is bent in such a way to produce 90° change in the direction of flow of the fluid/gas in the pipe.
How do you wire a 90 degree elbow?
0:001:461/2 in. 90 Degree Combination Pull Elbow to Box - YouTubeYouTubeStart of suggested clipEnd of suggested clipPut on the lock. Nut. You then remove the back.MorePut on the lock. Nut. You then remove the back.
How long is a 2 inch EMT 90?
EMT Large Radius 90° ElbowsTrade SizeMetric DesignatorOffset (B)*25315302 1/2638792 1/26310412 1/263118715 more rows
What is a stub on a conduit?
STUB – A stub is the length you need for the conduit to reach and is measured from the back of the bend or backside of the conduit. LEG – The remaining length of conduit minus the stub.
What is a take up on a 90?
Take up is a amount of conduit length used to figure out where to place the marks on the conduit before the bend. Most hand benders have the take up stamped on the bender or on a sticker – usually on the bender handle.
How to bend conduit with one foot?
Place one foot on the conduit and the other foot onto the bender foot. Grab the handle and using foot pressure on the bender foot and bend the conduit. Check the bend with a level to make sure it’s plumb. It’s really that simple.
How to bend a 90 degree bend?
3 Steps To Bend a 90 Degree Using the Reverse Method. Measure the length of conduit where you need the 90 to be and mark. Place the bender on the conduit with the hook pointing towards to short end and align the mark with the tip of the star. Place one foot on the conduit and the other foot onto the bender foot.
How long is a conduit?
Conduit comes in 10 foot lengths and can create an awkward bending situation when the stub length is over 60 inches. The reverse method for bending a 90 is an alternative that addresses this type of situation. This method is also used in back to back 90 degree bends.
How to make conduit bend plumb?
If you’re conduit bend isn’t quite plumb, you can take the end of the bender handle and insert it over the stub. You’ll need to either push or pull the handle depending on which way you need the stub to bend to make it plumb. It’s really that simple.
What is a stub in microwave?
In microwave and radio-frequency engineering, a stub or resonant stub is a length of transmission line or waveguide that is connected at one end only. The free end of the stub is either left open-circuit, or short-circuited (as is always the case for waveguides).
What is a radial stub?
Radial stubs are a planar component that consists of a sector of a circle rather than a constant-width line. They are used with planar transmission lines when a low impedance stub is required. Low characteristic impedance lines require a wide line. With a wide line the junction of the stub with the main line is not at a well defined point. Radial stubs overcome this difficulty by narrowing to a point at the junction. Filter circuits using stubs often use them in pairs, one connected to each side of the main line. A pair of radial stubs so connected is called a butterfly stub or a bowtie stub.
Why are stubs used in UHF?
Therefore, stubs are most commonly used in UHF or microwave circuits in which the wavelengths are short enough that the stub is conveniently small. They are often used to replace discrete capacitors and inductors, because at UHF and microwave frequencies lumped components perform poorly due to parasitic reactance.
Why do you need a stub on a stripline?
In a stripline circuit, a stub may be placed just before an output connector to compensate for small mismatches due to the device's output load or the connector itself. Stubs can be used to match a load impedance to the transmission line characteristic impedance. The stub is positioned a distance from the load.
What is a stub on a conduit?
STUB – A stub is the length you need for the conduit to reach and is measured from the back of the bend or backside of the conduit. LEG – The remaining length of conduit minus the stub.
What is a take up on a 90?
Take up is a amount of conduit length used to figure out where to place the marks on the conduit before the bend. Most hand benders have the take up stamped on the bender or on a sticker – usually on the bender handle.
How to bend conduit with one foot?
Place one foot on the conduit and the other foot onto the bender foot. Grab the handle and using foot pressure on the bender foot and bend the conduit. Check the bend with a level to make sure it’s plumb. It’s really that simple.
How to bend a 90 degree bend?
3 Steps To Bend a 90 Degree Using the Reverse Method. Measure the length of conduit where you need the 90 to be and mark. Place the bender on the conduit with the hook pointing towards to short end and align the mark with the tip of the star. Place one foot on the conduit and the other foot onto the bender foot.
How long is a conduit?
Conduit comes in 10 foot lengths and can create an awkward bending situation when the stub length is over 60 inches. The reverse method for bending a 90 is an alternative that addresses this type of situation. This method is also used in back to back 90 degree bends.
How to make conduit bend plumb?
If you’re conduit bend isn’t quite plumb, you can take the end of the bender handle and insert it over the stub. You’ll need to either push or pull the handle depending on which way you need the stub to bend to make it plumb. It’s really that simple.
