Hello all,
sorry for the OT, but the electronic expertise of the group is too good :-)
I'm looking for ideas and directions (articles and so on) to realize
very good phase noise xtal oscillator, in the range 20-50 MHz for high
performance frequency conversion. I would like to understand what
sorry for the OT, but the electronic expertise of the group is
too good :-)
I'm looking for ideas and directions (articles and so on) to realize
very good phase noise xtal oscillator, in the range 20-50 MHz for high
performance frequency conversion. I would like to understand what
On 09/18/2010 09:48 AM, francesco messineo wrote:
Hello all,
sorry for the OT, but the electronic expertise of the group is too good :-)
I'm looking for ideas and directions (articles and so on) to realize
very good phase noise xtal oscillator, in the range 20-50 MHz for high
performance
First of all, thanks to John and Magnus for inputs and links, makes a
very good start!
On 9/18/10, Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 09/18/2010 09:48 AM, francesco messineo wrote:
Hello all,
sorry for the OT, but the electronic expertise of the group is too good
:-)
I'm
On 09/18/2010 02:41 PM, francesco messineo wrote:
First of all, thanks to John and Magnus for inputs and links, makes a
very good start!
On 9/18/10, Magnus Danielsonmag...@rubidium.dyndns.org wrote:
On 09/18/2010 09:48 AM, francesco messineo wrote:
Hello all,
sorry for the OT, but the
On 09/18/2010 02:41 PM, francesco messineo wrote:
First of all, thanks to John and Magnus for inputs and links, makes a
very good start!
On 9/18/10, Magnus Danielsonmag...@rubidium.dyndns.org wrote:
On 09/18/2010 09:48 AM, francesco messineo wrote:
Hello all,
sorry for the OT, but the
Hello Frank,
Down East Microwave (DEMI) in Florida will be coming out with a
stabilized VHF LO module soon.
Should be a single board for 6M, 2M, 222, 432 MHz and possibly beacon duty.
Was designed by N5AC. 10 MHz external reference.
Hope fully a single programmed board can be jumpered for
I just recalled, you do want to check out John Miles (KE5FX) GPIB
toolkit, the PN.EXE software will let you use your spectrum analyzer (if
supported) to measure phase-noise. For your purpose it should be useful
for you. For some of my phase-noise needs my tools isn't sufficient yeat
to do
On 9/18/10, Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 09/18/2010 02:41 PM, francesco messineo wrote:
First of all, thanks to John and Magnus for inputs and links, makes a
very good start!
On 9/18/10, Magnus Danielsonmag...@rubidium.dyndns.org wrote:
On 09/18/2010 09:48 AM,
A couple of disclaimers here:
1. Leeson's oscillator model was mentioned. That
doesn't apply much to crystal oscillators. The close
in noise will be limited by the intrinsic noise of
the crystal and the far out noise will be limited by
the buffer amplifier. Leeson's model never comes
into
On 09/18/2010 04:12 PM, francesco messineo wrote:
One solution would use a stable standard oscillator, say 10 MHz, and
then use a bandpass filter to select suitable overtones for first
mixdown. You can select several options for selection of overtones, but
fixed LC-resonators comes to mind.
On 09/18/2010 04:28 PM, Richard (Rick) Karlquist wrote:
A couple of disclaimers here:
1. Leeson's oscillator model was mentioned. That
doesn't apply much to crystal oscillators. The close
in noise will be limited by the intrinsic noise of
the crystal and the far out noise will be limited by
the
On 9/18/10, Magnus Danielson mag...@rubidium.dyndns.org wrote:
A simple PLL is not that complex these days. As long as you have fairly
high comparator frequency after dividing down the VCO and reference you
could get away fairly easilly. Standard programmable dividers in the TTL
family and a
Another reference on VHF crystal oscillator circuits (if you can read
German) is:
http://www.axtal.com/data/buch/Kap6.pdf
In particular Figures 6.20 and 6.21 on page 23.
Bruce
Bruce
francesco messineo wrote:
On 9/18/10, Magnus Danielsonmag...@rubidium.dyndns.org wrote:
A simple PLL is
Hal,
The NIST web page is here:
http://www.nist.gov/physlab/div847/grp40/wwvb.cfm
[and the iers page and the historic leap second list, in a
subsequent message.]
I assume you can find the fine print there, but they probably aren't easily
machine readable.
Yes, sure, I know about those
Not completely OT, as stable and accurate timebases are very useful in
microwave systems...
What's the proper hardware to use for connecting WR-90 (10GHz) waveguide
sections? I figure 8-32 brass or stainless, avoiding anything magnetic.
Bob K6RTM in Silicon Valley
Magnetic is generally irrelevant unless you are working with an isolator
or maybe a gas noise source. A magnetic field won't alter the waves
propagation inside the guide. Stainless is generally used.
-John
=
Not completely OT, as stable and accurate timebases are very useful in
The field is contained entirely within the guide, so, you can use any type
of fastener on the flanges. Typically, however, brass or stainless is the
most common. It is OK to use ferrous screws/nuts, but they can become
magnetized if close to an isolator. If using one of those, then care should
be
Hi
Is -195 dbc/Hz floor good enough or is it overkill?
Is -155 dbc/Hz at 100 Hz offset a requirement or is -40 dbc ok?
You need to quantify what you are after before deciding on an approach. Low
noise means many different things to each of us.
Bob
On Sep 18, 2010, at 1:27 PM, francesco
k6...@comcast.net wrote:
Not completely OT, as stable and accurate timebases are very useful in microwave systems...
What's the proper hardware to use for connecting WR-90 (10GHz) waveguide sections? I figure 8-32 brass or stainless, avoiding anything magnetic.
whatever fits through the
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