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How do you test an RF attenuator?
The simplest method is to use an ohmmeter to check the resistance. The resistance of an attenuator or pad designed for a 50 ohm system will show the same resistance on either side because they are of a symmetrical design. This is true whether the pad or attenuator is made in the T or pi configuration.
Why attenuator is used in microwave?
WAVEGUIDE ATTENUATORS : In order to control power levels in a microwave system by partially absorbing the transmitted microwave signal, attenuators are employed. Resistive films (dielectric glass slab coated with aquadag) are used in the design of both fixed and variable attenuators.
What is the failure mode on an attenuator?
The failure mode was as follows: Receiver operation is normal when the Attenuator feature is disabled. Receiver operation fails (no receive and a very quiet noise-floor) when the Attenuator feature is enabled.
What to look for in a programmable attenuator?
A programmable attenuator, visible are the holding screws for the magnet as well as the contacts that turn the solenoid off once the switching has been completed, the little prongs that actuate the contacts are supposed to have a plastic sleeve over them, pay attention to this when you open a attenuator as missing sleeves are a common failure mode
What happens when the attenuator is disabled on a Yaesu?
It can be seen that the Attenuator circuit if formed with a 150Ω and 68Ω resistor voltage divider that is comprised of R1005 and R1012. When the Attenuator is disabled, the 150Ω R1005 is shorted by relay contacts and the 68Ω R1012 is removed from the circuit by relay contacts.
Can a step attenuator be repaired without a tool?
Since Agilent continuously ups the spare part prices and discontinues parts it has become more and more important to go past normal repair practices. Step Attenuators for example can be repaired without any special tools or cleanroom enviroment ! Lets take a look at the failure modes first, there are a few: