On Tue, 30 Dec 2025 14:43:11 GMT, PiteR wrote:
> w <news:1mng9agao4yku$.137iwvtge9ikm.dlg@40tude.net>
> dnia Tue, 30 Dec 2025 14:08:57 GMT user J.F pisze tak:
>> Sygnał DCF chyba nie zawiera tygodnia.
>
> hmm czat twierdzi ze ma

Albo nie ChatGPT, albo się douczył.

>
>
> what information is transmitted in DCF77, Deutsche Funkturm 77.5 kHz
> signal?
>
>
> The DCF77 signal (Deutsche Funkturm 77.5 kHz) is a time signal
> broadcast from Germany, and it transmits a variety of time-related
> information to synchronize clocks and devices. Here's a breakdown of
> the key information included in the DCF77 transmission:
>
>
> ### 1. **Time of Day (hh:mm:ss)**
>
> * **Hours (hh)**: The current hour in a 24-hour format.
> * **Minutes (mm)**: The current minute.
> * **Seconds (ss)**: The current second (with a pulse to indicate each
> second).
>
>
> ### 2. **Day of the Week**
>
> The DCF77 signal includes a 3-bit field that indicates the current
> **day of the week**, where:
>
> * **0** = Monday
> * **1** = Tuesday
> * **2** = Wednesday
> * **3** = Thursday
> * **4** = Friday
> * **5** = Saturday
> * **6** = Sunday
>
>
> ### 3. **Day of the Year (Julian Date)**
>
> The signal also includes a **day of the year** code, which specifies
> which day it is in the year (from 1 to 365/366, depending on the year).
> This is called the "Julian day."
>
>
> ### 4. **Week Number**
>
> The DCF77 signal carries the **week number** (from 1 to 52 or 53) to
> indicate which week of the year it is. This is encoded as a 6-bit
> number.

https://en.wikipedia.org/wiki/DCF77#Time_code_interp
retation

A tu nie ma.

Spytaj go na których bitach ramki.

Albo to w tej częsci kodowanej fazowo?


> ### 6. **Leap Year Indicator**
>
> A bit in the transmission indicates whether the current year is a
> **leap year** or not. This helps in determining whether February has 28
> or 29 days.

Tego też nie widzę.

Jest "Leap Second Announcement".

> ### 9. **Data Format and Error Checking**
>
> The transmitted data is encoded in a **biphase modulation** format.

Czyli jakby o fazowej piszą. A jest jeszcze amplitudowa ... i była od
początku ... i chyba większość z niej korzysta ... a może już nie?

> ### 10. **Signal Format**
>
> The signal is transmitted at a frequency of **77.5 kHz** and has a
> relatively low bit rate, meaning that each second of transmission
> encodes just a small amount of data.

W AM to 1 bit.
W PM ... niewyraźnie napisali ... też 1 bit :-)

J.