On 3/23/16 1:20 PM, Charles Steinmetz wrote:
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).
The SA44B isn't terrible
https://signalhound.com/sigdownloads/SA44B/AppNote-4.pdf
Using the internal TCXO
Around -100dBc (-90 to -110dBc) from 1-100 Hz out
<110dBc at 1kHz..
As with most synthesized sources, it depends on the external reference.
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