Re: [time-nuts] GPS discipline oscillator vs phase lock

jim...@earthlink.net said: >> Well, at JPL we regularly lock two crystal oscillators together that are >> over a billion km apart with added Allan deviation of less than 1E-15 at >> 1000 seconds with a radio link at 7.15 GHz. It's how we measure the >> distance and velocity to spacecraft (a few

[time-nuts] GPScon running on Raspberry Pi 3b

Hi, This is my first post to the community I learned so much from. Just wanted to share -- I managed to succesfully install today the GPScon windows application on a micro computer Raspberry Pi 3 model B. CPU utilisation is 2% - a perfect overall result. I used an FTDI RS232 USB dongle to

Re: [time-nuts] HP5090A Off Air Standard Receiver

On 06/18/2017 04:17 PM, GandalfG8--- via time-nuts wrote:> I have a 5090B which I'm hoping to get up and running when it finally reaches the top of the to do list and my view is that it would be much better to leave the original electronics undisturbed and to drive it with a 200 KHz signal

[time-nuts] Historical Review, Atomic Redefinition, SI Second

A good read; published a few weeks ago... Michael Lombardi: "A Historical Review of U.S. Contributions to the Atomic Redefinition of the SI Second in 1967" http://tf.boulder.nist.gov/general/pdf/2917.pdf /tvb ___ time-nuts mailing list --

Re: [time-nuts] GPS splitter

FWIW the one I chose (V26-102LED is specified to 2.4GHz and has a real DC block on one port and DC pass on the other. They also do up to 8 way versions. At an overall cost of about USD3 or so!!! Dave -Original Message- From:

Re: [time-nuts] GPS splitter

Hi One subtle advantage of the simple satellite splitters - F connector based DC blocks are dirt cheap …. Bob > On Jun 18, 2017, at 4:06 PM, ziggy9+time-n...@pumpkinbrook.com wrote: > > +1 for satellite splitters as a low cost option. But as others have > mentioned, you do need to use a

[time-nuts] Modified ZC6PD-1900W GPS splitter

On 6/17/2017 8:53 AM, Ben Hall wrote: I've been toying with the idea of modifying one of the units to add internal DC-blocking and resistors to ground for DC-load. For DC block, seems like I could very carefully slice the trace on the board by the SMA connector, bridging the gap with an SMA

[time-nuts] HP5090A Off Air Standard Receiver

Hi Pete That's quite good timing, if you'll pardon the expression:-), as I uploaded a pdf version of the 5090A manual to mediafire a couple of months ago http://www.mediafire.com/file/u0bf1eips89uo3h/HP_5090A_Ops_and_Service.pdf I know a few others have considered converting the 5090A

Re: [time-nuts] GPS splitter

+1 for satellite splitters as a low cost option. But as others have mentioned, you do need to use a little care. Some are 'DC isolated', but that can mean diode OR’ing for each port (all ports DC pass) and not a DC block. And they often don’t have the frequency response (many satellite

[time-nuts] HP5090A Off Air Standard Receiver

Does anyone happen to have an electronic copy of the user / technical manual they would share with me?All expenses covered. This rather unusual unit was produced in the UK in the days or the rather sensible 200kHz Droitwich transmissions. Im considering reworking the unit to the newer 198kHz

Re: [time-nuts] GPS discipline oscillator vs phase lock

On 6/18/17 7:10 AM, Attila Kinali wrote: On Sat, 17 Jun 2017 06:29:02 -0700 jimlux wrote: Well, at JPL we regularly lock two crystal oscillators together that are over a billion km apart with added Allan deviation of less than 1E-15 at 1000 seconds with a radio link at

Re: [time-nuts] GPS splitter

Hi It also depends a bit on weather the original designer anticipated odd things happening on the antenna circuit. The answer to that one is …. errr …. not always. Some designs have the antenna supply tacked straight into a bulk regulator that feeds a bunch of stuff. Other designs have an

Re: [time-nuts] GPS splitter

Hi, On 06/18/2017 05:37 PM, Bob kb8tq wrote: Hi On Jun 18, 2017, at 11:17 AM, David J Taylor wrote: "David J Taylor" wrote: .. or a ready-made, and smaller item:

Re: [time-nuts] GPS splitter

Hi > On Jun 18, 2017, at 11:17 AM, David J Taylor > wrote: > > "David J Taylor" wrote: > >> .. or a ready-made, and smaller item: >> >> http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696 >>

Re: [time-nuts] GPS splitter

"David J Taylor" wrote: .. or a ready-made, and smaller item: http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696 I use this successfully for 1.09 GHz ADS-B splitting. Please be aware that this is a Wilkinson splitter

Re: [time-nuts] GPS splitter

On Sun, 18 Jun 2017 07:50:17 +0100 "David J Taylor" wrote: > .. or a ready-made, and smaller item: > > > http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696 > > I use this successfully for 1.09 GHz ADS-B splitting.

Re: [time-nuts] GPS discipline oscillator vs phase lock

On Sat, 17 Jun 2017 06:29:02 -0700 jimlux wrote: > Well, at JPL we regularly lock two crystal oscillators together that are > over a billion km apart with added Allan deviation of less than 1E-15 at > 1000 seconds with a radio link at 7.15 GHz. It's how we measure the >

Re: [time-nuts] GPS splitter

Hi If you don’t mind shopping a bit, the Minicircuits two way GPS splitters shipped out with every TBolt and a variety of other Lucent gear. They show up at very cheap prices sometimes … My suggestion is to spend the $20 and just get one of the eight way Minicircuits L band units. That way

Re: [time-nuts] GPS splitter

Hi There is a poorman's way of making a -3dB splitter using lengths of cable of characteristic impedance equal to the system impedance. [] John Ponsonby .. or a ready-made, and smaller item: