On 6/18/16 12:05 PM, Bob Camp wrote:
Hi
The Symmetricom Time Pod is pretty much the lowest cost commercial / newl “low
phase noise” measurement instrument. You can find all sorts
of older stuff on auction sites in who knows what shape. The HP 3048 is the
granddaddy of them all.
the time pod is about 8-9k (I just got a quote on one).
I don't think the 4406 is inherently very quiet, if they're making close
in measurements, they may have another quiet source to drive it from, or
they are beating the unit under test against a quiet reference, and just
using the 4406 to look at the IF.
Bob
On Jun 18, 2016, at 12:11 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
<drkir...@kirkbymicrowave.co.uk> wrote:
I was looking at some high end commercial low noise oscillators and see
they use instrument like the Agilent E5052B signal source analyzer for
phase noise measurements. When I looked for them on eBay, it soon because
apparently they were very expensive.
Then I see this oscillator that locks to GPS
http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=107&products_id=234
and looked at what was used to make the phase noise measurements. It was an
Agilent E4406A. The noise floor is nowhere near as low as the more
expensive instruments, but the E4406A is available for under $500, which is
more than two orders of magnitudes cheaper than an E5052B.
I'm wondering if there are other more suitable commercial instruments
around that don't cost a fortune, yet would allow lower levels of phase
noise to be measured. I tend to preference HP/Agilent kit, as it is better
supported, both by the manufacturer and places like the HP/Agilent Yahoo
group.
Dave
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