Quick question about the RTC

WK4DS All Messages By This Member #106238 So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.? Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point. WK4DS David
Ashhar Farhan All Messages By This Member #106241 We use the DS3231, which is as accurate as possible with quartz crystal. There are 2.6 million seconds in a month. If the clock drift is even 1 pulse per million, we are still going to be off by 2.6 seconds in a month. The only alternative would be to add gps to keep the clock synced at all times when not connected for extended periods of time. - f toggle quoted message Show quoted text On Mon, Nov 20, 2023, 7:21 AM WK4DS <georgiaphotog@...> wrote: So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.? Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point. WK4DS David
Tony Abbey All Messages By This Member #106253 As long as there are other signals present, you don't need an accurate clock. Just use a sync button in the gap between transmissions.? toggle quoted message Show quoted text On Mon, 20 Nov 2023, 07:21 WK4DS, <georgiaphotog@...> wrote: So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.? Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point. WK4DS David
WK4DS All Messages By This Member #106274 I'm lost here. I dont?have a "sync" button on my radio. Is this is another program? I am using the native system built in by Ashhar and not the others. toggle quoted message Show quoted text On Mon, Nov 20, 2023 at 8:06?AM Tony Abbey <tabbey01@...> wrote: As long as there are other signals present, you don't need an accurate clock. Just use a sync button in the gap between transmissions.? On Mon, 20 Nov 2023, 07:21 WK4DS, <georgiaphotog@...> wrote: So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.? Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point. WK4DS David
WK4DS All Messages By This Member #106275 Thank you for the information, so if I log into the internet a day or two before I should be well within the limits of the FT8 requirements, that helps a lot. Thank you! toggle quoted message Show quoted text On Sun, Nov 19, 2023 at 9:55?PM Ashhar Farhan <farhanbox@...> wrote: We use the DS3231, which is as accurate as possible with quartz crystal. There are 2.6 million seconds in a month. If the clock drift is even 1 pulse per million, we are still going to be off by 2.6 seconds in a month. The only alternative would be to add gps to keep the clock synced at all times when not connected for extended periods of time. - f On Mon, Nov 20, 2023, 7:21 AM WK4DS <georgiaphotog@...> wrote: So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.? Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point. WK4DS David
ajparent1/kb1gmx All Messages By This Member #106276 The Rpi can run a network time protocol software...? that means a network connection. That's sufficiently accurate for Ft8, and is the standard way to keep the clock accurate. normally NTP is the package that does that. -- Allison ------------------ Please use the forum, offline and private will go to bit bucket.
rdg #106277 If you are running the current Raspbian OS on your Pi, it now uses a system daemon to keep the system RTC accurate,?rather than NTP. ?You can of course still run NTP but that is hitting the network time servers 2x and you don’t need to do that. Sent from for iOS toggle quoted message Show quoted text On Mon, Nov 20, 2023 at 21:43, ajparent1/kb1gmx via groups.io <kb1gmx@...> wrote: The Rpi can run a network time protocol software...? that means a network connection. That's sufficiently accurate for Ft8, and is the standard way to keep the clock accurate. normally NTP is the package that does that. -- Allison ------------------ Please use the forum, offline and private will go to bit bucket.
Tony Abbey All Messages By This Member #106282 Hi David I've used some completely different software for a different radio - I was only saying that you don't need an accurate clock if you have a sync button - I'm sure one could be added so that you don't need to have an internet connection at all. Tony toggle quoted message Show quoted text On Tue, 21 Nov 2023 at 08:37, WK4DS <georgiaphotog@...> wrote: I'm lost here. I dont?have a "sync" button on my radio. Is this is another program? I am using the native system built in by Ashhar and not the others. On Mon, Nov 20, 2023 at 8:06?AM Tony Abbey <tabbey01@...> wrote: As long as there are other signals present, you don't need an accurate clock. Just use a sync button in the gap between transmissions.? On Mon, 20 Nov 2023, 07:21 WK4DS, <georgiaphotog@...> wrote: So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.? Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point. WK4DS David
WK4DS All Messages By This Member #106296 Oh!? Ok. Thank you. It has been working albiet slowly at times. I plan to install the v3 once Ashhar approves it for general distribution as I am no coder. I am looking forward to that too from the sounds of things.? Thank you again! WK4DS? toggle quoted message Show quoted text On Tue, Nov 21, 2023 at 02:55 Tony Abbey <tabbey01@...> wrote: Hi David I've used some completely different software for a different radio - I was only saying that you don't need an accurate clock if you have a sync button - I'm sure one could be added so that you don't need to have an internet connection at all. Tony On Tue, 21 Nov 2023 at 08:37, WK4DS <georgiaphotog@...> wrote: I'm lost here. I dont?have a "sync" button on my radio. Is this is another program? I am using the native system built in by Ashhar and not the others. On Mon, Nov 20, 2023 at 8:06?AM Tony Abbey <tabbey01@...> wrote: As long as there are other signals present, you don't need an accurate clock. Just use a sync button in the gap between transmissions.? On Mon, 20 Nov 2023, 07:21 WK4DS, <georgiaphotog@...> wrote: So FT8 has to be really accurate to work like it should and the sBitx V2 have the RTC in it and I am guessing for this reason. I have gotten a couple of emails from people saying the time is off by 1 second or maybe a little more and I was wondering how does the sBitx set the time and how long can I expect it to hold that time without internet connected? I am under the impression that the RTC is super precise and I want to know how long can I trust it to use FT8? That's all.? Thanks for the help Ashhar, I am really loving the radio and look forward to learning how to install v3 at some point. WK4DS David

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Quick question about the RTC