is there someone here that can help me understand
the difference between the dsb and ssb noise figures,
and more importantly, in a typical situation, which applies.
the typical story is that NF is usually about 0.5 db
worse than conversion loss.
( hard to put into writing here)
situation 1.
normal ham situation, you only want one sideband.
what is best expected NF, when WORKING WITH COMPONENTS
at normal room temperature, ..assume LO is well filtered
to eliminate wideband noise.
situation 2, same as 1, except the RF port of the mixer
is reactively terminated, at the ( INPUT's) image.
situation 3, zero IF
( seems to not make sense, as if you do a measurement
with a noise diode, and a 'Y' measurement, you will get
more 'delta', but the system is not any better than ssb.)
thanks for any comment, i THINK i COULD could come
up with more precise questions,
after some thinking about it.
sorry about qrm on this post, the baNDS ARE NOISY
((((((73))))))
the difference between the dsb and ssb noise figures,
and more importantly, in a typical situation, which applies.
the typical story is that NF is usually about 0.5 db
worse than conversion loss.
( hard to put into writing here)
situation 1.
normal ham situation, you only want one sideband.
what is best expected NF, when WORKING WITH COMPONENTS
at normal room temperature, ..assume LO is well filtered
to eliminate wideband noise.
situation 2, same as 1, except the RF port of the mixer
is reactively terminated, at the ( INPUT's) image.
situation 3, zero IF
( seems to not make sense, as if you do a measurement
with a noise diode, and a 'Y' measurement, you will get
more 'delta', but the system is not any better than ssb.)
thanks for any comment, i THINK i COULD could come
up with more precise questions,
after some thinking about it.
sorry about qrm on this post, the baNDS ARE NOISY
((((((73))))))