[time-nuts] WWV Receivers

> esp. if one uses a Chinese $6.50 incl. shipping HF receiver off eBay; Could somebody give me a lesson in receivers appropriate for extracting time from WWV? Is $10 a realistic price? -- These are my opinions. I hate spam. ___ time-nuts

Re: [time-nuts] WWV Receivers

In message <20170207072741.b084f406...@ip-64-139-1-69.sjc.megapath.net>, Hal Murray writes: > >> esp. if one uses a Chinese $6.50 incl. shipping HF receiver off eBay; > >Could somebody give me a lesson in receivers appropriate for extracting time >from WWV? Somebody should do an SDR

Re: [time-nuts] WWV Receivers

On Mon, Feb 6, 2017 at 11:27 PM, Hal Murray wrote: > > > esp. if one uses a Chinese $6.50 incl. shipping HF receiver off eBay; > > Could somebody give me a lesson in receivers appropriate for extracting > time > from WWV? > > Is $10 a realistic price? > Yes, this would

[time-nuts] Sub-ps delay line

Hello, I'm looking/designing a sub-ps delay line with very high stability. Basically it has microwave requirements on phase matching. The main features that such delay line should have are: - sub-ps resolution and about 1 ns range - High stability, must not drift more than 2ps/year, preferably

Re: [time-nuts] information about the Austron Synchronous Filter 2090A

> Hi, any ideas on what the Austron Synchronous Filter 2090A is for? I > couldn't find it in the '88 catalog. I recall seeing some hits for it > in old unclassified DoD R publications in the past, wherein it was > used as part of an experimental LORAN reception setup. >From the data sheet:

Re: [time-nuts] Sub-ps delay line

Hi, My first thought would be to use a pair of couplers before and after the delay line and bring it into a mixer to serve as a phase detector such that you can create a control loop to stabilize delay. This way you get a handle on the temperature variations. There is trombone delays that

Re: [time-nuts] Sub-ps delay line

I did something similar a couple years ago to make an adjustable 75 nanosecond pretrigger for my sampling oscilloscope so I will just pass along some things I learned. Power supply noise will create jitter in single ended logic because of lack of power supply rejection. Temperature will be a

Re: [time-nuts] eLoran is up and operating. Looking good

Yo Bob! On Tue, 7 Feb 2017 21:38:52 -0500 Bob Camp wrote: > Teaching > the NTP drivers when not to use the data and how to compare data is a > do-able thing. It’s just that nobody has ever bothered to do it. The NTPsec team would love to work with anyone that has a device that

Re: [time-nuts] eLoran is up and operating. Looking good

Hi A very practical contribution one *could* make would be to enhance the drivers for the radio based systems. Propagation is a big deal with any of the radio setups. Loran is no exception to that. Teaching the NTP drivers when not to use the data and how to compare data is a do-able thing.

Re: [time-nuts] Sub-ps delay line

Since you need a set-and-forget type of solution, could you use a wide trace on your board and laser etch/mill it to set your delay, similar to the way film resistors are trimmed?  IOW, add length by turning the wide trace into a zig-zag. Bob 

Re: [time-nuts] Sub-ps delay line

I would also advise you take a look at how well you can maintain your system impedance, say 50 Ohms. For example, I have seen about 100's ps phase difference on a 10 MHz reference, using one BNC female-female coupler versus another, a small part is due to TOF, but most of that is due to subtle

Re: [time-nuts] Sub-ps delay line

In message , Mattia Rizzi writes: >I'm looking/designing a sub-ps delay line with very high stability. >Basically it has microwave requirements on phase matching. >The main features that such delay line should have are:

Re: [time-nuts] Sub-ps delay line

Hello, >Put a length of coax in an adjustable oven ? Using the numbers provided by [1], RG58 has about -0.152 ps/m/deg. I need 1 ns range, cable length is prohibitive. cheers, Mattia [1] http://www.hepl.hiroshima-u.ac.jp/phx/notes/cable/cable.html 2017-02-07 18:04 GMT+01:00 Poul-Henning Kamp