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how noise is 10db
This could be demonstrated, but not possible here in the forum.
Now I don't remember the title of the book I read some years ago. :cry:
Formula to translate ENR at the output of the coax attenuator is much more complex than ENR_translated = ENR-Att[dB].
Papers written from NIST engineers explain well how ENR could be translated.
You also shoud consider that uncertainty related to the new ENR will be higher than the uncertainty...
They are mechanical compatible, but their dimensions are not exactly the same:
the inner diameter of the external conductor of the coaxial structure is 2.92 mm for the K connector and 3.5 mm for the sma connector.
In addition the dielectric material isn't the same:
SMA --> teflon
K --> air...
3.5mm sma adapter
3.5 mm connector and K connector are mechanical but not electrical compatible (read mismatches).
In the first one the inner diameter of the external conductor is 3.5mm and it is used up to 26 GHz (but the cut off frequency is higher); the inner conductor of the external...
Re: ENR
ENR=(Th-T0)/T0.
Usually it is expressed in dB.
T0 = 290 K (standard noise temperature).
Th [K] is the equivalent noise temperature of the noise source.
The ENR (or Th) characterizes a noise source, particurarly the noise power at its output.
bye
Re: PIN Diode
A forward biased pin diode behaves like a variable resistor at microwave frequencies. They are used for limiters, attenuators and switches.
antenna noise power temperature conversion dbm/hz
Take a passive 2 port network. Close the input port with a termination at T0 temperature. The noise power density from the termination is kT0.
The noise power density at the output port of the 2 port is kT0.
Thje noise power is kT0B where B...
ktbf noise
this is a different question. :)
you shoul use a bandwidth of the meas setup lower than Bf. Please Read Application note agilent 57-3 : you'll find the answer to this topic.
This is not correct. The NF of a 2 port network is a function of the input reflection coefficient. The relationship between NF and the reflection coefficient is a function of 4 real parameters (noise parameters).
regards
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