Re: [time-nuts] Timestamps in audio files?

On Mon, December 21, 2015 5:19 am, Tim Shoppa wrote: > Are there any standard consumer-type audio file formats, that support > absolute time time/datestamps? Broadcast WAV file (BWF) is probably the closest. I'm not sure what different timecode formats are possible, but this description of how

Re: [time-nuts] SMD TADD-1 distribution amplifier - seeking comments and suggestions?

> > AD8055 in non-inverting circuit with 1+2k7/2k7 gain has 9.6 nV/sqrt(Hz) > > input-referred voltage noise PSD (if I calculated correctly..) > > With +10dBm input the corresponding SSB PN floor should be around > -163dBc/Hz. > HI, How is that calculated? I only get this far: 9.6nV/sqrt(Hz)

Re: [time-nuts] Timestamps in audio files?

Analogies to broadcast timing are interesting, but that seems like a non-starter today due to multiple cascaded codec latencies. The video formats I know that use timestamps for historical reconstruction, just recorded a human-readable timestamp onto the video itself at original recording time.

Re: [time-nuts] SMD TADD-1 distribution amplifier

Anders wrote: How is that calculated? I only get this far: 9.6nV/sqrt(Hz) into a 50R load is 1.8e-18 W/Hz or -147.3 dBm/Hz what then? As I said on Dec. 18 in response to the original post, the in-band (10MHz) noise is NOT the main problem with respect to AM and PM noise. The main problem

Re: [time-nuts] 5370B stop trigger not working

You might want to re-scope the start and stop channel outputs where they cross A4 and verify against the front panel labels. The signal line crossing A4 that lines up with frontpanel start is start and the one that lines up with stop is stop. I mention this because the A3 board is a carry

Re: [time-nuts] Timestamps in audio files?

tsho...@gmail.com said: > I know of many proprietary digital recording applications that make WAV's or > MP3's or proprietary codec formats, where the filename includes a timestamp. > Much more interested in standard formats where the timestamp is embedded in > the file itself. What sort of

Re: [time-nuts] Timestamps in audio files?

Hi I sort of suspect that if there *was* a system “broadcasting” time over the internet (other than NTP) we all would be fooling around locking up oscillators to it … Yes, streaming and time stamping are not the same thing. These days though, the two probably get crossed between a lot. Bob >

Re: [time-nuts] Anybody who can record last Loran-C transmissions ?

In message <20151220235152.gc23...@cs.utwente.nl>, Pieter-Tjerk de Boer writes: >I'm the developer of that WebSDR, and I was already planning to use it to >make some raw signal recordings on New Year's eve. Thankyou! -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20

Re: [time-nuts] SMD TADD-1 distribution amplifier

Such blanket statements aren't a particularly useful guide unless calibrated by measurements. For example the OPA653 has a measured PN floor of around -163dBc/Hz for a +13dBm input and the measured PN @1Hz offset is -150dBc/Hz (comparable with the NIST isolation amps).However the voltage noise

Re: [time-nuts] SMD TADD-1 distribution amplifier - seeking comments and suggestions?

Hi To go through the whole deal a step at a time *assuming* that broadband noise is the only issue: -147 dbm noise per Hz +10 dbm signal => -157 dbc / Hz half to AM, half to PM => -160 dbc / Hz ssb is already taken care of (noise on both sides if it’s broadband) => -160 dbc / Hz Now,

[time-nuts] PPS phase between two GPS units.

Hi All,   So I've been playing with some timing hardware here, and have noticed something rather curious. I have two otherwise identical Lea-6T GPS modules, configured exactly the same. These units are tied to the same antenna, with a splitter with the same length cables running to each unit.

Re: [time-nuts] PPS phase between two GPS units.

I think you are doing the right test to see if the splitter delay is the issue 21 ns is mighty small and a real possibility. Regards Paul WB8TSL On Mon, Dec 21, 2015 at 8:24 PM, wrote: > Hi All, > > So I've been playing with some timing hardware here, and have noticed >

Re: [time-nuts] SMD TADD-1 distribution amplifier - seeking comments and suggestions?

Do those modern CMOS gates use deuterated wafers?I've not found any measurements of the PN of modern CMOS gates.The measurements of devices like the venerable 74AC04 indicate a PN floor around 10dBc/Hz worse than that. Bruce On Tuesday, 22 December 2015 3:00 PM, Bob Camp

[time-nuts] HP5065A battery pack

I remember the discussion on the battery pack of the HP5065A option 002. I have right now the opportunity to have an original pack for service and I have taken some picture of it. see: http://www.timeok.it/wp/wp-content/uploads/2015/08/HP5065A-battey-pack-v1.0.pdf Luciano www.timeok.it

[time-nuts] Timestamps in audio files?

As an adjunct to the thread about timestamped samples of LORAN transmissions... Are there any standard consumer-type audio file formats, that support absolute time time/datestamps? Would not have to be done continuously, but something like a time and date stamp inserted nearest each sample on a

Re: [time-nuts] Timestamps in audio files?

On 12/21/15 3:19 AM, Tim Shoppa wrote: As an adjunct to the thread about timestamped samples of LORAN transmissions... Are there any standard consumer-type audio file formats, that support absolute time time/datestamps? Would not have to be done continuously, but something like a time and date