[time-nuts] Near field propagation

This paper may be of interest. https://people.eecs.berkeley.edu/~pister/290Q/Papers/Antennas%20propagation%20interference/near%20field%20path%20loss.pdf -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

Re: [time-nuts] Radio Controlled Clocks

No, my GPS clock has it's own timekeeping function, complete with leap years and automatic DST setting, clocked from the 1 PPS signal. All running in a PIC 16F628 (It uses a Nixie tube display, because I just happened to have some tubes !) The timekeeping registers are updated every minute

Re: [time-nuts] Radio Controlled Clocks

Update. The Junghans Mega is approx 100ms late updating its display. And it's pretty cold, sitting in the outside shed so the LCD is a bit sluggish. It looks like the designers of that tried to do the job properly. Andy www.g4jnt.com On Sun, 27 Dec 2020 at 14:54, Andy Talbot wrote: > I've

Re: [time-nuts] Radio Controlled Clocks

A clock that uses an NMEA stream for its display will be a few hundred milliseconds slow, dependent on the chosen data products and serial baud rate, as NMEA gives the time of the previous second mark. David N1HAC On 12/27/20 9:54 AM, Andy Talbot wrote: I've just had a look around the house,

Re: [time-nuts] Rebroadcasting time signals [WAS: La Crosse Clocks - ]

Hi > On Dec 27, 2020, at 10:30 AM, Tim Shoppa wrote: > > Presumably any "rebroadcast" of WWVB is done in the spirit of near-field > communications where any far-field radiation falls off like 1/r^3 from a > small inductive transmitter loop. > > A loop the size of your entire house would be

Re: [time-nuts] Rebroadcasting time signals [WAS: La Crosse Clocks - ]

I have been using Chronvertor for years to simulate MSF transmission (from GPS source) since I am way outside the range of the British transmitter. However I am feeding the signal directly into the receiver so no problems with (un)intentional radiation. According to the homepage

Re: [time-nuts] Rebroadcasting time signals [WAS: La Crosse Clocks - ]

Presumably any "rebroadcast" of WWVB is done in the spirit of near-field communications where any far-field radiation falls off like 1/r^3 from a small inductive transmitter loop. A loop the size of your entire house would be "small" in terms of 60kHz wavelength. Unintended coupling of the 60kHz

Re: [time-nuts] Rebroadcasting time signals [WAS: La Crosse Clocks - ]

It just occurred to me that one of the TinySA's could be handy for tracking down leaks like this. Dana On Sun, Dec 27, 2020 at 8:02 AM Bob kb8tq wrote: > Hi > > If you can hear it on your radio with your normal antenna …. it’s leaking. > > If you want to track it down, normal radio frequency

Re: [time-nuts] Radio Controlled Clocks

I've just had a look around the house, and actually have four MSF clocks and an old wristwatch minus its strap (antenna is a small ferrite rod inside). Forgot I had an old Junghans one as well - that is sitting out in the shed as it requires a stronger signal than the more modern ones, and seems

Re: [time-nuts] Radio Controlled Clocks

In the 90's Junghans came to Miami to test reception because it was the farthest from Colorado and I coordinated their visit because I knew the then owners. They subsequently shipped me 2 analog, 2 digital clocks and 2 watches. The metal watches had an antenna in the leather watch band. The

Re: [time-nuts] Rebroadcasting time signals [WAS: La Crosse Clocks - ]

Hi If you can hear it on your radio with your normal antenna …. it’s leaking. If you want to track it down, normal radio frequency direction finding techniques work. At 10 MHz a loop or rod antenna is likely your best bet. Bob > On Dec 27, 2020, at 5:05 AM, Hal Murray wrote: > > >

Re: [time-nuts] Radio Controlled Clocks

Hello Andy, I have an old Maplin digital LCD clock for MSF, and that is always about a second slow, but the Coopers analogue clocks are MUCH closer, as is the Junghens DCF digital LCD clock. But the Junghens DCF clock always misses one or other of the DST changes! Peter On Sun, 27

[time-nuts] PRS10 not locking to 1PPS

Hello Time-Nuts, I am an user of a PRS10 Rubidium standard. The unit has firmware revision 3.15. After reset to factory settings the Time Offset (TO) was set to 1814. Normally it was -1814. Now de PRS10 is not locking to the 1PPS anymore. It will freeze when PL = 1. It will freeze after

Re: [time-nuts] Rebroadcasting time signals [WAS: La Crosse Clocks - ]

Do your receiver clocks need continuous access to the signal? The several radio-clocks I have here in England only enable their receiver for a few minutes at about 01:00 to reset themselves, and then put the receiver to sleep again. If yours are similar, your rebroadcast system could be

Re: [time-nuts] La Crosse Clocks -

t...@leapsecond.com said: > For transmit, you likely don't need, and legally don't want, an antenna. You need some sort of structure to get the signal out. It may not be large or look like a typical antenna but there will be something that is radiating or the project won't work. When I

Re: [time-nuts] Rebroadcasting time signals [WAS: La Crosse Clocks - ]

Hal wrote: Transmitting on the same frequency you are receiving on seems like asking for troubles. Difficult perhaps, but not impossible. As /tvb notes, one solution is time domain multiplexing; and, as Alex says, phase domain multiplexing is another (although the phase discrimination of