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Pulsing Gating Blanking Masking
Wed 25th May 2016 at 8:21pm, 0 comments

Don't you wish that there were more accurate and definitive terms in electronics? In so many ways, physicists and engineers have done such a great job: everyone knows what a volt is, what an amp is, what an ohm is, watt a what is. I'm sorry I mean; what a watt is.
 
But terms like 'pulsing,' 'blanking,' 'gating' and 'masking' are open to misinterpretation, to the point one would think that they were almost invented in some conspiracy to cause confusion, angst and argument.
 
So to settle the argument, ease the angst and eliminate the confusion; let us define the terms now. At least to the point that they are used in E&I's data sheets and documentation!

1. Pulsing
    a. A signal that has an on and off period within a given time frame
         i. There are several ways this can be specified
             1. Space / Bar
             2. Pulse length / Duty cycle
             3. Pulse length / Repetition rate
    b. An electronic circuit capable of switching an RF signal to form a pulse of RF.
 
2. Blanking
    a. A period of time that an RF amplifier is incapable of amplifying a signal
        i. Normally because the unit is switched to a mode to reduce inherent noise.
    b. An electronic circuit capable of switching an RF amplifier to a mode that reduces electrical noise.
 
3. Gating
    a. A confusing term that sometimes refers to pulsing and sometimes blanking
        i. We won't use it.
 
4. Masking
    a. A term that normally refers to blanking but has uses in ECCM so best avoided.



Now that we have that clear as mud, let us tell you about E&I's new pulsing and blanking options. E&I now offers three new options for most of its amplifiers: 'Pulsing', 'Blanking' and 'Pulsing and Blanking'

Pulsing

    a. User inputs cw RF into the RF input
    b. User inputs TTL (+5/0V) signal into the rear of the unit
    c. When TTL is high (+5 V) RF will appear at the output
    d. When TTL is low (0V) there is no output.

Blanking

    a. User inputs a pulsed RF signal into the RF input
    b. User inputs a TTL (+5/0V) signal into the rear of the unit (min 1.5 mS before RF)
    c. When TTL is high (+5V) the RF transistors are turned on and the unit amplifiers the RF pulses that are applied to the input
    d. When TTL is low (0V) the gates of the RF devices are disabled. This eliminates noise from the output of the amplifier.

Pulsing and blanking

    a. User inputs cw RF into the RF input
    b. User inputs TTL (+5/0V) signal into the rear of the unit
    c. RF appears at the output 1.5 mS after the TTL goes high
 
For full technical specifications of these features send us an enquiry or e-mail me at tonyharris@eandiltd.com

Cheers,

Tony Harris
13th May 2015


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