John the problem is the NIST does not endorse one brand vs another. They go to
great lengths to stay neutral. But if knowledge of the products used sheds
light on the research it is not a usually a problem. I would say an educated
guess the 6 and 8 channel receivers were oncores, and the
Hi
I believe that Jim is more or less right. There seems to be an agreement not to
name names. I’m sure it’s partly to keep everybody happy when the paper is
presented. It also does relate to some sort of rules and regs.
Bob
On Oct 30, 2013, at 3:00 AM, Tom Knox act...@hotmail.com wrote:
Hi
There are a *lot* of SMT OCXO’s out there. A J lead part is SMT, but identical
to it’s through hole counterpart. It will mount pretty much same / same….
Bob
On Oct 29, 2013, at 10:18 PM, John C. Westmoreland, P.E.
j...@westmorelandengineering.com wrote:
Hello,
I was wondering if I
John:
All SMT OCXO's will either have a recommended PCB footprint in the spec
sheet
or will refer you to a recommended footprint in another document.
Some don't care about a ground plane under the part, some require it
with no crossing signals, some require an open thermal hole underneath
the
Hi,
They have learned the hard way that they can't do that easily. They can,
if they add the necessary mentioning of vendor X and their product Y
does in no way means an endorsement. I've seen presentations starting
with a non-endorsement statement so that they can then say Oh, this
is the boxes
On 10/30/13 3:46 PM, Magnus Danielson wrote:
Hi,
They have learned the hard way that they can't do that easily. They can,
if they add the necessary mentioning of vendor X and their product Y
does in no way means an endorsement. I've seen presentations starting
with a non-endorsement statement
On 10/31/2013 12:14 AM, Jim Lux wrote:
On 10/30/13 3:46 PM, Magnus Danielson wrote:
Hi,
They have learned the hard way that they can't do that easily. They can,
if they add the necessary mentioning of vendor X and their product Y
does in no way means an endorsement. I've seen presentations
Graham and Time Nuts,
(thanks for the answers.)
I have another question - I am looking at a part from MTI. I wanted to use
one of their 3.3V parts. They are telling me to use the 12V part because
the 3.3V part can have an issue with ground loops due to the higher current
requirements at that
Hi
Consider that microvolts matter on the EFC. Unless you have a separate return
for the oven current it’s going to be tough to keep everything separate. One
might ask “why no separate return”. Well when you design one in, and then go
look at people’s layouts - you might as well not have
Bob,
OK - that makes sense. If you follow good analog/digital layout rules then
this may not be a problem. But your point about the EFC sensitivity is
well taken.
But, that is always a problem.
Yes, do a lot of people violate good analog/digital layout rules,
especially on the ground planes -
Is this JL LC_XO at around $300 going to supress the used Trimble/Zwhatever
market price? I hope so. I think I would have put out the $ for this one
rather than a 10 or more year old used piece of equipment. I still may do it.
I just need to justify it somehow.
Dave
N3DT
I've been living with this Nortel unit for over a month now and moved the
antenna all over the place, plus made a different antenna and nothing seems to
change as far as the Osc ppt/div. So I'm giving up and just going to install
the antenna where it seems to get the best signal strength. I
Dave,
I have an LC_XO and a GPSDO, both from Jackson Labs. There are more than
just a few of us also that are a part of the OpenHPSDR effort that have
evaluated the units (GPSDO) for over 1 year now (I have a project that is a
bit overdue...but that is another story...)
But, I haven't seen one
Hi
You may have a good layout on your board, but they have to get the current to
that pin / pad somehow. In all likelihood the amps of current through the pad
it’s self are going to cause issues. Also remember that the ground is likely an
RF return as well. Multiple rules and layout issues all
Hi
The Jackson Labs part has been around for a while. It seems to have no impact
at all on the auction market prices for GPSDO’s. They seem to simply be driven
by supply and demand for this or that very specific box. Even the availability
of the NTBW parts at $135 has had no noticeable impact
John:
Look at the ppm (or however they express it) as to the sensitivity of the
frequency stability of the OCXO relative to Voltage input.
Say the oven power drops from 3 watts to 1 Watt as the oven comes up
to temperature. At 3 Volts, relative to 12 Volts, for a given resistance,
it is four
Graham,
Good points - yes, I have this part currently in the design: TPS75833KTTT
(LDO from TI) - putting another one down
(just) for the OCXO isn't a problem.
And a nice 12V rail isn't a problem either since this is for a radio with a
nice 12V source. Could I boost the 3.3V rail to
12V or
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