Re: [time-nuts] Trimble replacement part-2

Hi Anything that is locked to GPS isn't going to fill the bill. You need something that is not going to correlate to GPS blips. If it tracks GPS, you will simply optimize so that the errors in one of them are the same as the errors in the other one. Bob On Oct 13, 2013, at 7:01 PM, quartz55

Re: [time-nuts] Trimble replacement part-2

"...To *know* that the frequency is correct you still need an external high accuracy reference to compare to. The gizmo's main spec is not going to be ADEV. ADEV won't tell you what the actual frequency is. Bob" That's what I've finally figured out. It looks like the LN CSAC GPSDO may fit t

Re: [time-nuts] Trimble replacement part-2

On Sun, Oct 13, 2013 at 5:21 PM, Jim Sanford wrote: > Someone earlier suggested a group buy of the Jackson Labs device. I would > be interested. Interested in which part? The Fury, the Fury OEM board or the GPSxCXO eval board? ___ time-nuts mailing li

Re: [time-nuts] Trimble replacement part-2

Gpscon work fine as long as you are using win xp. I had a hitch when I tried to use it with win7. They also work with Z38xx. Bill Sent from my iPad > On Oct 13, 2013, at 4:21 PM, Jim Sanford wrote: > > Someone earlier suggested a group buy of the Jackson Labs device. I would be > intereste

Re: [time-nuts] Trimble replacement part-2

Hi The Nortel / Trimble units have a DC-DC converter in therm. They pretty much already have all the switcher issues. Of course the up side to that is the regulation that's built in. You can do a diode switch to a backup battery without much effort at all. Bob On Oct 13, 2013, at 5:21 PM, Ji

Re: [time-nuts] Trimble replacement part-2

Someone earlier suggested a group buy of the Jackson Labs device. I would be interested. As for power supplies, my Nortel-TB is on an analog power supply, deliberately. I do intend to put a scope on it, and see if it may be contributing noise to the "issues" I see. (I'm wondering if it has

Re: [time-nuts] Trimble replacement part-2

Hi The manual is not correct when it implies that as the tuning resolution. There are many months of threads here digging into the how and why of the real tuning resolution. A 1x10^-(anything) tuning resolution is a possible thing with an OCXO - just gang up enough DAC's. That's not where the

Re: [time-nuts] Trimble replacement part-2

Now there's an interesting project:  turning Bert's board into a controller for an Rb standard. = )  If I'm reading the manual right it says: "For an FE-5680A device with an output frequency of 10 MHz, this corresponds to a relative frequency setting resolution of 1.7854E-14."  This should be th

Re: [time-nuts] Trimble replacement part-2

Hi All of the surplus GPSDO's are designed for cell tower applications. They are time references rather than frequency references. That's true of a TBolt, the HP 38xx's, the Nortel / Trimble's and the Symmetricom / Trimbles. It's also true of many the TIme Source series of parts (for various re

Re: [time-nuts] Trimble replacement part-2

From: quartz55 To: time-nuts@febo.com Sent: Sunday, October 13, 2013 1:22 PM Subject: [time-nuts] Trimble replacement part-2 "I looked into the VE2AZY project, but that too seemed to be fraught with issues and still questionable accuracy, plus I wasn't looking for another project, just a fr

[time-nuts] Trimble replacement part-2

I bought a Nortel/TB last month to go along with my LPRO-101. I guess I'm satisfied with it for the $130 delivered with antenna for a 10MHz standard. Both are much better than anything else I have around the shop. The only thing is, I'm still not sure where my frequency is. I don't know how c

Re: [time-nuts] Trimble replacement part-2

Hi Frank, I would NOT put the spare TB on a PC powersupply. Check out both TB's on the bench using decent linear supplies. I don't like using PC supplies on critical equipment. They are typically designed for a specific (high) load on one output (5V on early ones 12V on more modern) to maintain

Re: [time-nuts] 3-D GPS antenna?

On Wed, 09 Oct 2013 17:11:02 -0400 Peter Gottlieb wrote: > http://www.technologyreview.com/news/519811/a-cure-for-urban-gps-a-3-d-antenna/ Does anyone have any more detailed description of the antenna design? I couldn't find anything beside what is written on the Locata homepage. Not even some c

Re: [time-nuts] 3-D GPS antenna?

Peter, I took a look at the article - interesting and thanks for posting the link. Regards, John Westmoreland On Wed, Oct 9, 2013 at 2:11 PM, Peter Gottlieb wrote: > http://www.technologyreview.**com/news/519811/a-cure-for-** > urban-gps-a-3-d-antenna/