[time-nuts] eBay GPS antenna test results.

Bob wrote: Is it labeled 3.3 to 18V on the antenna? No, the writing on the antenna is all Chinese. The specs published on eBay state that it is. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Symmetricom 58532A GPS Antenna : Launch3 Surplus

3M has a product called Cold Shrink tubing. It is designed to seal high voltage, etc cables in buried installations. It is a silicone (?) rubber stretched over a collapsable polyethylene core. You run the cable through the core and pull on a tab which unwinds the core and the stretched

Re: [time-nuts] eBay GPS antenna test results.

I would surmise that the antenna has (or rather had) a protection network to protect against voltage spikes or surges. Your description of events seems consistent with an triggered SCR crowbar circuit, and the 2nd attempt at the higher current limit shorted the SCR. Note that this may not have

Re: [time-nuts] Symmetricom 58532A GPS Antenna : Launch3 Surplus

It's called 'adhesive lined heatshrink'. Yes, it's available, though a reel of the Good Stuff (Raychem) costs a small fortune. They also make custom boots to fit various standard connectors. Probably best bought as surplus or from a trusted seller who bought reels from military, autosport or

Re: [time-nuts] Symmetricom 58532A GPS Antenna : Launch3 Surplus

Hi There are tapes designed for waterproofing things like coax connectors. Bob > On Feb 9, 2018, at 7:41 PM, Hal Murray wrote: > > > li...@philpem.me.uk said: >> Generally speaking, you can seal most RF connectors quite nicely with a few >> layers of

Re: [time-nuts] Symmetricom 58532A GPS Antenna : Launch3 Surplus

li...@philpem.me.uk said: > Generally speaking, you can seal most RF connectors quite nicely with a few > layers of self-amalgamating tape and a layer of PVC tape over the top of > that (to protect from UV). Many years ago, I picked up a chunk of scrap the local cable TV installer had left on

Re: [time-nuts] Symmetricom 58532A GPS Antenna : Launch3 Surplus

On 06/02/18 22:21, Angus via time-nuts wrote: > On Tue, 6 Feb 2018 14:54:23 -0500, you wrote: > >> 3) it’s designed for continuous outdoor use (connector is well shielded etc) > > That's something that has always baffled me - the number of antennas > which the manufacturers claim are suitable

Re: [time-nuts] Receiving the MSF time signal on cheap radio modules

On 07/02/18 01:16, Bob kb8tq wrote: >> MSF disciplined oscillator?! I don't trust these receivers to any better >> than about the 20ms mark, so such a disciplined oscillator would have quite >> a long integration time! > > Once upon a time, that *was* how people did disciplined oscillators. Part

Re: [time-nuts] eBay GPS antenna test results.

On 9 February 2018 at 21:43, John Green wrote: > To those who doubted that the antenna was actually a 3.3 to 18 volt design, > it seems you were correct. Today, I hooked it up to a variable power supply > and slowly raised the DC voltage fed to the antenna. It began to pull >

Re: [time-nuts] eBay GPS antenna test results.

Hi Is it labeled 3.3 to 18V on the antenna? Bob > On Feb 9, 2018, at 4:43 PM, John Green wrote: > > To those who doubted that the antenna was actually a 3.3 to 18 volt design, > it seems you were correct. Today, I hooked it up to a variable power supply > and slowly raised

Re: [time-nuts] eBay GPS antenna test results.

To those who doubted that the antenna was actually a 3.3 to 18 volt design, it seems you were correct. Today, I hooked it up to a variable power supply and slowly raised the DC voltage fed to the antenna. It began to pull current at about 2.9 volts and at 3.3 volts, took about 40 mA. I continued

Re: [time-nuts] Looking for Datum TymServe 2000 (TS2000) manual

Skip - The Trimble Acutime 2000 outdoor antenna http://www.n4iqt.com/trimble/Acutime2000.pdf looks identical to the Trimble Palisade GPS antenna. http://dc2light.co.uk/PALISADE-Manual.zip Mark, GM4ISM had surplus Palisade antennas, at one time. He noted differential RS-422 configuration and TSIP

Re: [time-nuts] True Time Nut Mission: NASA's Deep Space Atomic Clock (DSAC)

Yeah -- delays happen. The DSAC is part of the US Air Force STP-2 program. STP-2 launch was awarded to SpaceX in December, 2012. But the Falcon Heavy only completed it's first launch earlier this week, and instead of sending a customer payload they send a Tesla to past the orbit of Mars.

Re: [time-nuts] True Time Nut Mission: NASA's Deep Space Atomic Clock (DSAC)

On 2/8/18 8:55 PM, Bill Byrom wrote: After the successful Falcon Heavy launch earlier this week, it appears that the Deep Space Atomic Clock (DSAC) is now scheduled to go up in June 2018 on a Falcon Heavy carrying the US Air Force STP-2 test payloads.