[time-nuts] Spectrum Analyzer Specifications
Charles Steinmetz
csteinmetz at yandex.com
Wed Mar 23 20:20:01 UTC 2016
Peter wrote:
>May I suggest the use of a software defined receiver (SDR) used with
>suitable attenuators on its antenna input.
The task the OP needs performed is to simultaneously receive a CW
signal at ~ +13dBm, while at the same time resolving and
differentiating sidebands as close as fractions of a Hz at ~ -80dBm
and lower. Yes, the signal can be attenuated (say, CW signal at
-10dBm and close-in sidebands at -103dBm and below, or CW signal at
-30dBm and close-in sidebands at -133dBm and below). Anyway you cut
it, that is a dynamic range of more than 90dB at frequency offsets of
fractional Hz. The phase noise of the receiver's LO will completely
swamp the phase noise of the oscillator being tested, by tens of dB
(called reciprocal mixing).
Best regards,
Charles
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