Time Signals on National Radio Out by one second?

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171 posts

Master Geek

#175826 13-Jul-2015 10:54

Surely I am not the only one to notice that the time signals on National Radio at the top of the hour are out by one second. Or at least I assume so because the time shown on my atomic wrist watch (works off GPS satellites) is one second ahead of the National Radio time signals at the top of the hour. Maybe the leap second that was added at the start of July has something to do with it. I can't find any reference anywhere to the problem. Perhaps someone else knows more?

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Ultimate Geek

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#1342025 13-Jul-2015 11:06

Are you listening to the radio or streaming? The stream is always behind.

cisconz

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#1342029 13-Jul-2015 11:08

Bananabob: Are you listening to the radio or streaming? The stream is always behind.

Mine buffers for 5 seconds or so

Hmmmm

wellygary

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#1342036 13-Jul-2015 11:12

iF the difference has only just started to appear, then its likely to have been the leap second,

http://www.insidegnss.com/node/4551
you might need to do a manual adjust on you devive to correct it..

Geektastic

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#1342102 13-Jul-2015 12:45

I find them out when compared against my phone and my Garmin Fenix 2 (which sets the time using the clocks in GPS satellites) and that is FM not streaming.

ubergeeknz

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Vocus

#1342140 13-Jul-2015 13:11

http://www.leapsecond.com/java/gpsclock.htm

Suggest having a read :) Quite probably your device(s) is (are) not adjusted for the leap second(s).

https://www.msl.irl.cri.nz/services/time-and-frequency

also interesting reading. Good chance that time signal (on National Radio) is reliable.

kiwitrc

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#1342148 13-Jul-2015 13:26

Only 1 second? That means National Radio has suddenly caught up 40 years from somewhere?

sbiddle

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#1342180 13-Jul-2015 13:50

Has this always been this way?

I would have assumed that with the current encoding and broadcast distribution around the country that some latency has to occur and that 1s wouldn't be an unacceptable delay.

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ubergeeknz

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Vocus

#1342202 13-Jul-2015 14:02

sbiddle: Has this always been this way?

I would have assumed that with the current encoding and broadcast distribution around the country that some latency has to occur and that 1s wouldn't be an unacceptable delay.

a whole second is a lot still

nitrotech

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Uber Geek

#1342207 13-Jul-2015 14:08

Some sites are now fed by satellite as apposed to digital/analogue lines or STL.

In testing digital links via comrex gear, even on dedicated wan with guaranteed low latency and jitter figures, buffers had to be increased to stop audio dropouts.

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Master Geek

#1342208 13-Jul-2015 14:10

I'm definitely not streaming - I'm receiving live National Radio in Wellington on an FM receiver on 101.3 MHz. The 1 second variation in the time signal was only apparent to me after midday on 1st July. Up until then both were in sync exactly. The 1 second variation has been there ever since (12 days now). The GPS time on my Smart phone and atomic watch both agree. National Radio is one second behind both of them.

MikeB4

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#1342211 13-Jul-2015 14:12

Am I missing something here?

kiwitrc

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#1342219 13-Jul-2015 14:15

login: I'm definitely not streaming - I'm receiving live National Radio in Wellington on an FM receiver on 101.3 MHz. The 1 second variation in the time signal was only apparent to me after midday on 1st July. Up until then both were in sync exactly. The 1 second variation has been there ever since (12 days now). The GPS time on my Smart phone and atomic watch both agree. National Radio is one second behind both of them.

In that case it sounds like they haven't compensated for leap second.

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Master Geek

#1342223 13-Jul-2015 14:20

kiwitrc:
login: I'm definitely not streaming - I'm receiving live National Radio in Wellington on an FM receiver on 101.3 MHz. The 1 second variation in the time signal was only apparent to me after midday on 1st July. Up until then both were in sync exactly. The 1 second variation has been there ever since (12 days now). The GPS time on my Smart phone and atomic watch both agree. National Radio is one second behind both of them.

In that case it sounds like they haven't compensated for leap second.

In which case it would be National Radio that haven't compensated for the leap second because it is their time signal that is is one second behind.

kiwitrc

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#1342235 13-Jul-2015 14:28

login:
kiwitrc:
login: I'm definitely not streaming - I'm receiving live National Radio in Wellington on an FM receiver on 101.3 MHz. The 1 second variation in the time signal was only apparent to me after midday on 1st July. Up until then both were in sync exactly. The 1 second variation has been there ever since (12 days now). The GPS time on my Smart phone and atomic watch both agree. National Radio is one second behind both of them.

In that case it sounds like they haven't compensated for leap second.

In which case it would be National Radio that haven't compensated for the leap second because it is their time signal that is is one second behind.

They probably just need to adjust the pendulum control valve on their steam powered clock.

You should be able to google your watch model with leap second to see if there is anything about it.

Geektastic

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#1342241 13-Jul-2015 14:46

sbiddle: Has this always been this way?

I would have assumed that with the current encoding and broadcast distribution around the country that some latency has to occur and that 1s wouldn't be an unacceptable delay.

It either "is" the time or it "isn't".

You can't go around claiming it "is" 1300 when in fact it's "approximately 1300".....

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