Re: [time-nuts] Good GPSDO on eBay?

My experience is different. When I received a broken item from China, it was damaged in shipment because it was poorly packed, the seller told be to keep the broken part because he did not want to pay to ship something he would just toss in the trash. eBay's current policy is given here:

Re: [time-nuts] Good GPSDO on eBay?

Hi The EEVB guys have been going around on these GPSDO’s for about a year now. Lots of people have tried to get refunds on them. Pretty much every trick in the book (replacement is in the mail …. need one more piece of information from you … shipping clerk in the hospital with bubonic plague …)

Re: [time-nuts] Good GPSDO on eBay?

No, my experience with Chinese sellers, even when you file a "not as described" case, is that eBay will require you to return the item at your own expense if the seller has stated they will not pay return shipping. Ebay's attitude was that the seller could just state in their item description

[time-nuts] Good GPSDO on eBay?

I don't think there is a way to control the loop parameters except maybe some PFORTH commands. The Trimble units can be put into holdover via software. The Symmetricom units require you to disconnect the antenna (or possibly use a SCPI command to manually set the DAC voltage... Lady Heather

Re: [time-nuts] Good GPSDO on eBay?

Mark wrote: Charles, You are confusing these units with those made by that ham in China (can't remember his callsign, begins with a "B"). The guts of these boxes is a telco GPDDO board made by either Trimble or Symmetricom (you can tell because of the 6.0V power requirement).And that

Re: [time-nuts] Good GPSDO on eBay?

Michael wrote: I think what the seller saying is that the counter was externally referenced to the Thunderbolt for the frequency measurements that they state. Yes, on re-reading the listing, I believe you are right. Thanks! Charles ___ time-nuts

Re: [time-nuts] Good GPSDO on eBay?

On Sat, Jul 9, 2016 at 5:51 PM, Richard W. Solomon wrote: > What a deal, if it arrives DOA, return shipment is on > your nickel. I would look elsewhere. That is not true. If it were DOA and the seller would not take it back post paid you could file a "not as described" on

[time-nuts] Good GPSDO on eBay?

All the affordable GPSDOs out there are surplus telecom devices... Thunderbolts, Z38xx's, NTP, etc. They were built to rigorous telco standards and can be excellent performers. Just because they are surplus, does not make them junk. The latest round of surplus GPSDOs to hit the

Re: [time-nuts] Good GPSDO on eBay?

To paraphrase a few other folks, taking on the task of building your own, even using the VE2ZAZ board as a basis is a very educational experience. It will teach you an enormous amount. There are lessons in control systems, phase and frequency locked loops, oven controllers, phase and frequency

Re: [time-nuts] Good GPSDO on eBay?

ly 9, 2016 9:14 PM Subject: Re: [time-nuts] Good GPSDO on eBay? since you asked ... Many thoughts, none of them good. Recycled components sold for real money. Too many "versions" to figure out "what you got". If all you want is a frequency standard to turn it on and &quo

Re: [time-nuts] Good GPSDO on eBay?

Richard wrote: This looks like a good beginner's GPSDO on eBay: 172148560746 "This is GPS Disciplined Clock made with trimble GPSDO Board.Full tested by Agilent 53132A with US-012 option and Ex-ref from trimble thunderbolt GPSDO." The seller says it has a sine wave output and is

Re: [time-nuts] Good GPSDO on eBay?

since you asked ... Many thoughts, none of them good. Recycled components sold for real money. Too many "versions" to figure out "what you got". If all you want is a frequency standard to turn it on and "forget it" spend a few extra bucks and get one with all new components from a domestic

[time-nuts] Good GPSDO on eBay?

Charles, You are confusing these units with those made by that ham in China (can't remember his callsign, begins with a "B"). The guts of these boxes is a telco GPDDO board made by either Trimble or Symmetricom (you can tell because of the 6.0V power requirement).And that reference to a

Re: [time-nuts] Good GPSDO on eBay?

"Full tested by Agilent 53132A with US-012 option and Ex-ref from trimble thunderbolt GPSDO." I think what the seller saying is that the counter was externally referenced to the Thunderbolt for the frequency measurements that they state. Cheers Michael On Sun, Jul 10, 2016 at 10:58 AM, Charles

Re: [time-nuts] Good GPSDO on eBay?

What a deal, if it arrives DOA, return shipment is on your nickel. I would look elsewhere. 73, Dick, W1KSZ -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Richard Mogford Sent: Saturday, July 09, 2016 4:40 PM To: time-nuts@febo.com Subject: [time-nuts

[time-nuts] Good GPSDO on eBay?

They are based upon a telco surplus "UCCM" GPSDO board. Both Symmetricom and Trimble made (mostly) compatible units. I prefer the Trimble units... they store their settings in EEPROM. The Symmetricom units don't... and have to do a long re-survey every time you power them up. Plus the

[time-nuts] Good GPSDO on eBay?

This looks like a good beginner's GPSDO on eBay: 172148560746 "This is GPS Disciplined Clock made with trimble GPSDO Board.Full tested by Agilent 53132A with US-012 option and Ex-ref from trimble thunderbolt GPSDO." The seller says it has a sine wave output and is accurate from

Re: [time-nuts] Good GPSDO?

with the mfg. numbers as I mentioned you will find them a lot cheaper if you want to roll out your own. -=Bryan=- > From: rch...@earthlink.net > Date: Sat, 2 Jul 2016 21:28:12 -0700 > To: time-nuts@febo.com > Subject: [time-nuts] Good GPSDO? > > I am just getting into the precise

Re: [time-nuts] Good GPSDO?

I am just getting into the precise time and frequency stuff. I thought I should buy a GPSDO. There are quite a few similar-looking ones on eBay, such as eBay number 281802105734 There is also a Trimble at 252162780444 Would either of these be OK for a newbie like me? Richard

[time-nuts] Good GPSDO?

I am just getting into the precise time and frequency stuff. I thought I should buy a GPSDO. There are quite a few similar-looking ones on eBay, such as eBay number 281802105734 There is also a Trimble at 252162780444 Would either of these be OK for a newbie like me? Richard