What is the resolution of the digital pot that sets that frequency? If I can
remember the same setability issue can be seen in the 8920A.
In the data sheet for this machine, HP only cites temperature and aging specs
for the option 001 oscillator and states "+/- 1 Hz plus timebase accuracy" for
Bob,
I was referring to the bulk of the conversations on this device where people
were finding 60 Hz related artifacts.
Greg
>On Date: Mon, 29 Feb 2016 21:11:19 -0500
>From: Bob Camp wrote:
>
>Hi
>
>On some parts the spur shows up in the 40 to 80 Hz range.
>That pretty much rules out the line
Not sure if I am missing something here or not but an early mention was made
regarding synching the test equipment used to the 60 Hz line to see if the
purported 60 Hz anomaly is actually synchronous or asynchronous. I haven't
heard anything regarding this since then.
Greg
Having been in the product design world (both MIL and commercial/medical) for
most of my life, I developed a very deep respect for HP quality and reliability
over the years. It wasn't uncommon for management to peek into the lab and
find me poking around inside a piece of HP equipment to see
Running a little late here in responding. But I give thanks to both Bob Camp
and Tim Shoppa for exposing my oversight about finding the spec for this
oscillator on the (where else?) CTS site. I originally tried but was not
inserting the proper part number in their search field.
Guess the
There seems to be a plethora of the CTS 1960017 OCXOs on eBay at the moment.
Would anyone have any stability specs on this device?
Greg
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To all,
Am not sure if any news of this has been posted in prior times or not but will
pass it along just in case.
Manuals Plus (http://www.manualsplus.com/) will be closing its doors the middle
of June. The proliferation of available PDF documents available plus the
increasing number of
Sort of a Navy AN/URQ-10A (Frequency Electroncs FE1000Q) and a Systeron Donner
8520 rolled into one. Both are in ARINC outlines and would fill about the same
dimensions side-by-side. The only difference would be that the SD also outputs
IRIG time codes.
Greg
Reading all of this brings back memories of a project I was involved in back in
the early 70's in the Denver area. NBS-Boulder was experimenting with
injecting their time standard into the video of the analog signal before it hit
the transmitter. We installed a prototype unit that was slaved
Not certain as to how NBS achieved the transfer of timing accuracy but it was
not believed to be in the VITS interval. If I can recall, there was a special
waiver (FCC/NTIA) that was required in order to run the experiment. And it
required some esoteric hardware to decode the signal at the
I did a little digging and managed to find a paper on the original television
time experiment which was authored by David Howe of NBS, now head of the Time
and Frequency Metrology Group at NIST. It can be found at
Am looking at a small cesium standard for a proposed client project:
http://synreference.com/frequency-references/cesium-reference/item/37-portable-battery-powered-reference.html
Greg
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Tom,
Thank you for your concern. I unfortunately cannot disclose many details about
the proposed project only to say that the application transcends much of the
typical Time-Nuts areas of normality. At present we are evaluating typical
frequency references to see if they will fit into this
Just a note to say that a HP 5087A distribution amplifier arrived yesterday
purchased from a seller on eBay (http://www.ebay.com/itm/300903865292). I
initially emailed him requesting the option information on the unit or if he
could give information as to what option modules are installed
Interesting you should mention this. At the moment I have a calibration
running in the lab that utilizes a Dataq Instruments (http://www.dataq.com/)
DI-710 data logger unit that is being fed from the analog output of a HP 3575A
gain/phase meter. The DI-710 then couples to a PC via the USB
A couple if items that may have already been mentioned:
1. You've probably already seen the effects of the capacity of your adjustment
tool on the oscillator frequency if you are adjusting a variable capacitor. It
sometimes becomes a tweak, remove tool, watch and tweak again issue. If you
Thank you for you replies Dave and Paul!
Well, patience won out and I left the unit on for a considerably longer time.
The inner oven meter indication then started to come up off of zero after
nearly seven hours. Not knowing the thermal mass it has to heat I guess I
assumed that it would
On Fri, 26 Apr 2013 17:59:21 -0700, Jim Lux wrote:
Total dose will be very small (after all astronauts live in LEO)
So you'd worry about cosmic rays and single event effects.
snip
They fly a lot of unmodified commercial equipment on ISS (and on
Shuttle, when we still flew it) and they
On Sat, 27 Apr 2013 12:06:45 -0700 (PDT), L. Forster wrote:
When I was building space payloads, every component had to meet or exceed
a VCM (Volitile Condensible Material) spec.
This was mainly of concern with plastics, like wire insulation (we used
Teflon and Kapton) but especially potting
On Sat, 27 Apr 2013 16:16:17 -0400, Paul Swed wrote:
I looked and must have hit the same site you did for the sulzer. Yes I
expect a log warmup. I used them in the navy and we never let them go
cold. circa 1973-1979. Took them to the cal lab on battery etc. I thought
maybe I would have a
I'm weighing in a little late on this one but wanted to make a few comments
regarding cables and connectors in hopes that a prior poster may not have
covered these thoughts.
With regards to single-shield coaxial cables, I think we are all aware that
shielding effectiveness can vary widely
Hi George,
Your setup looks like a good approach to what you need for your requirements.
I was looking at the weatherproof enclosure for your antenna. If I am correct,
you have a total seal with regards to that container. The fasteners that pass
through the enclosure on the top, are they
George,
Don't need much of a hole. I wouldn't go past a single 1/16 one or so. That
would be small enough to keep most critters out of the container.
From what I can observe, that gasket is recessed down below the inner surface
of the cover with the container inverted as it is. Any moisture
In my business we term it analysis paralysis.
Greg
With sufficient thrust, pigs fly just fine...
On Thu, 27 Sep 2012 07:29:46 -0700, Chuck Forsberg WA7KGX N2469R
c...@omen.com wrote:
I cannot think of a time-nuts WWVB reference requirement
that cannot be better satisfied with a GPSDO.
Will
Haven't had a single problem with my GPS antennas at my home and all of my
sites for nearly 8 years now. They work well up inside the building by the
wooden roof ridge even with 10-20 inches of snow on top in the winter time.
G
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I have had a neat little WWVB receiver hanging around the lab that was made by
a now defunct company called Elemek out of East Syracuse, New York. It was
manufactured in 1979 and consists of a handful of discrete components for the
RF front end followed by simple CMOS logic and a few analog op
http://www.symmetricom.com/lp/gbu/csac-landing-page/
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After experiencing UPS issues, I now specify Fed-X where possible. The outside
condition of the containers even look better when delivered. These people seem
to care more about what they are doing. I once had a large ~150 lb low-pass RF
filter that arrived by Fed-X freight that was delivered
Shortly after I started bidding on eBay back in the 90's, I quickly learned
that many of the sellers are not knowledgeable equipment shippers. My very
first experience included a shipment from Britain of a very expensive
communications receiver where the seller simply wrapped cardboard around
I'm surprised that it has worked for me so many times and there were instances
when the seller thanked me for helping them pack the item properly. It doesn't
hurt to help educate those who don't understand. Others may benefit from it.
Ignorance can be fixed. Stupidity can't.
I worked in a
Have you tried contacting Vectron International?
http://www.vectron.com/contact/index.htm
Several years ago I gathered a sizable quantity of various precision surplus
OCXOs of Vectron manufacture for a feasibility demo on a client project. A
phone call and I was into the engineering
Sometimes the cone of protection simply does not exist. A couple of weeks
ago I had to respons to one of my sites which contains an 800 foot tower.
While there a large storm cell developed and a severe thunderstorm ensued.
Shortly before leaving lighting hit the tower which was unnerving
There is also quite a plethora of information available regarding other's
experiences, etc. with the design of such antennas by simply Googling
quadrifilar antenna design. I like to get a feel how things are going in the
industry before delving into design of such critters. Starting off with
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