[time-nuts] OT: xtal osc PN
magnus at rubidium.dyndns.org
Sun Sep 19 14:17:47 UTC 2010
On 09/19/2010 09:35 AM, francesco messineo wrote:
> On 9/19/10, Bob Camp<lists at rtty.us> wrote:
>> Is -195 dbc/Hz floor good enough or is it overkill?
> I'd say this is obviously overkill, -160 dBc/Hz could be a good compromise.
>> Is -155 dbc/Hz at 100 Hz offset a requirement or is -40 dbc ok?
> -40 dBc/Hz at 100 Hz is about useless, -150 dBc/Hz at 100 Hz is again
> a good compromise, the lower (practically) the better.
Do you *really* need -150 dBc/Hz? That is a hard requirement!
> It's hard to explain why to ones not familiar with weak signal
> operation between broadcasting signals, but really the noise floor
> raise a lot when you have some 5 or 6 broadcasts signals in 500 KHz of
> band (all with power levels of at least 10 dB more than the levels
> used in amateur radio, often +20 dB more)
I would need some more fundamental understanding of the system and needs
to be able to understand how you come up with the above noise level at
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