NTP GPS
-
Or…..
https://www.startech.com/Cards-Adapters/Serial-Cards-Adapters/rs-232-to-ttl-signal-converter~IC232TTL
-
Except for the price! That's ridiculous, parts cost is ~0.80 €/$
Technically it is correct. -
So I got the MC7700 to work for GPS but not for PPS. Looks like it cannot use PPS for this function. The question then is what is the accuracy of the GPS. I don't need milisecond accuracy. It can be give or take 5 minutes for my purpose.
I am waiting for response from China on a GPS unit that can do TTL, just not sure of PPS capable. PDF makes a reference to PPS.
Chipset used says it is PPS capabale Page 16
https://tinyurl.com/ybma6s6c
https://www.aliexpress.com/item/SKYLAB-RS232-USB-UART-TTL-protocol-DB9-USB-micro-fit-3-0-connector-GPS-Receiver-SKM55/32746957174.html Unit price is 22.44
http://www.skylab.com.cn/uploadfile/Download/201507071212151510.pdf
Possible to get unit with audio jack. 4 Pin See Pic
Then I would only need the SKM55 with 4 pin audio (TTL) see pic.
-
Based on what I have found GPS without PPS provides basically the same type of time as would an NTP over a broadband connection. Basically 500 ms would be completely acceptable I would think for most applications.
https://superuser.com/questions/849526/gps-without-pps-vs-gps-with-pps-vs-ntp
-
Hi…i am a new user here. As per my knowledge a punch out tool only makes sense for dozens of devices to modify.Just drill a hole and use a regular, round 3-conductor cable for your serial port. All you need is Gnd, TX & RX anyway. 1m of regular microphone cable from your local music store will do and is durable and solid.
