The thermal contribution to SSB phase noise power is -177dBm/Hz. For a carrier level of 0dBm the corresponding SSB phase noise is -177dBc/Hz.
Its even possible to measure the residual phase noise of components where the component phase noise is below the phase noise due to thermal noise.
PN is only significant in an FM receiver when there is no significant AM to PM conversion in any limiters that may be employed.
Bruce Joe Leikhim wrote:
From a practical standpoint, which is it -177 or -174 dBm? This is confusing topic. If for example an FM receiver, does the AM component become irrelevant? _(snip)__ As Bob stated thermal noise is equally divided between AM and PM components when a carrier is present. Both the AM and PM noise components are -177dBm/Hz their sum is -174dBm/Hz. Bruce_
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