Bill: -110 dbc/hz at 10khz offset is what I REMEMBER in my response to the question, "What is a good phase noise number to shoot for in a microwave narrowband (ssb/cw) system?"
My memory may very well be WRONG, which was the point of asking my question.
I agree with you, looks like -90dbC at 10 KHz, but given what Juan's already said about his sources, and the uncertainties of the SDR-IQ, that may be VERY good!
Do you have a different answer to my original question, "What is a good phase noise number to shoot for in a microwave narrowband (ssb/cw) system?" If so, I'd like to engage in that conversation, both for Eagle and for my terrestrial microwave station.
I agree with your assessment of Juan's work -- ABSOLUTELY EXEMPLARY!!!!!!
Thanks & 73, Jim wb4gcs@amsat.org
Bill Ress wrote:
Jim,
Where did the -110 dBC/Hz at 10 KHz come from? And at what frequency? That's pretty aggressive using straight forward VCO's and PLLs. From Juan's data with his snappy SDRIQ, it looks like that the 70 cm is doing about -90 dBc/Hz at10 KHz. I thought that's what I read from his early HP8566B dtata.
My straight forward S2 RX downconverter PLL LO does -100 dBc/Hz at 10 KHz.
We'd better get a good read on this since, if real, it forces more sophisticated LO designs.
Great work Juan!!
Regards...Bill - N6GHz
Jim Sanford wrote:
I think I remember Bob's answer as -110dbc at 10 KHz offset.
Thanks & 73, Jim wb4gcs@amsat.org