3 ms·
> is it difficult to get reception? Do you have to put the receiver near a window or something? The answer to that is "it depends". Windows are known to work
by traceroute66 5y ago
> is it difficult to get reception? Do you have to put the receiver near a window or something?
The answer to that is "it depends".
Windows are known to work, but not all windows are made equal. Which direction your window is facing and whether you are in an urban canyon can make significant difference. Some windows also have films or coatings.
If you are working in tricky situations, then the quality of your antenna and the quality of your receiver will make a difference (e.g. multi-constellation support, interference mitigation, multipath rejection etc. etc.).
If you do not have access to a workable window, then your alternative options are:
- Accept slightly lower accuracy and use LW radio instead (e.g. MSF, DCF etc.)
- Rent a leased line to your country's national time laboratory. They will deliver you certified, traceable time with no roof access required and microsecond accuracy (backed by an SLA, i.e. accurate or your money back).
- Run a long cable to the roof (if money is no object you can even get super fancy setups that run exclusively on fibre, no coax in sight)
- Install an internal GNSS repeater system (still involves roof install, but gives you *much* more flexibility indoors for obvious reasons).
- throw0101a 5y ago> […] and whether you are in an urban canyon can make significant difference. AIUI, urban canyons was one of the reasons why Japan built their QZSS system: * https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System * https://gssc.esa.int/navipedia/index.php/QZSS_Signal_Plan https://gssc.esa.int/navipedia/index.php/QZSS_Signal_Plan
- hansor 5y agoOr you could just have your own atomic clock. It is not uncommon, and not complicated as you might think[1]. Other methods for obtaining times are: - GPS: Satellite receiver for the Global Positioning System - GNS: Combined GPS/GLONASS/Galileo/BeiDou satellite receiver (L1 frequency band), can also be used for mobile applications - GNS-UC: GPS and Galileo Satellite Receiver with Up Converter for Meinberg GPS Antenna/Converter - PZF: DCF77 correlation receiver for middle europe - MSF: Long wave receiver for Great Britain - WWVB: Long wave receiver for the US time signal - TCR: Time code receiver for IRIG A/B, AFNOR or IEEE1344 codes - MRS: (GPS, PPS, 10MHz, NTP): Multi Reference Source - several reference source [1]: https://www.muquans.com/ https://www.muquans.com/