Search found 5 matches

by Josh(KF4BF)
Mon Jan 15, 2018 11:26 pm
Forum: Off-Topic
Topic: GPS Clock Project
Replies: 8
Views: 22031

Re: GPS Clock Project

This YouTube clip provides an excellent overview of the requirements of these modern inexpensive GPS modules:

https://www.youtube.com/watch?v=FmdG66kTfsI
by Josh(KF4BF)
Fri Jan 12, 2018 5:25 pm
Forum: Off-Topic
Topic: GPS Clock Project
Replies: 8
Views: 22031

Re: GPS Clock Project

SOLUTION REALIZED! After reading the DATA SHEET on the PA6H GPS Module used in the Adafruit receiver, here is what I found on its PPS accuracy: 1.5 1PPS A pulse per second (1 PPS) is an electrical signal that very precisely indicates the start of a second. Depending on the source, properly operatin...
by Josh(KF4BF)
Fri Jan 12, 2018 4:10 pm
Forum: Off-Topic
Topic: GPS Clock Project
Replies: 8
Views: 22031

Re: GPS Clock Project

Hmmm, just found this receiver for $39US, but by time you order accessories and antenna, it around $50US.

It does not say how stable the clock pulse Pin is, but its very interesting! Just found it.

https://www.adafruit.com/product/3133?g ... gJA8vD_BwE
by Josh(KF4BF)
Fri Jan 12, 2018 3:57 pm
Forum: Off-Topic
Topic: GPS Clock Project
Replies: 8
Views: 22031

Re: GPS Clock Project

http://aprs.gids.nl/gpskit/gps-readme.html It uses the Rockwell Jupiter GPS module (no longer available). Pins of interest on it are Pin 19 and Pin 20. Following was copied from the website above: pin 19 1 PPS (puls per second) signal. This is a TTL signal with a frequency of exactly 1 Hz. The pulse...
by Josh(KF4BF)
Fri Dec 29, 2017 11:02 pm
Forum: Off-Topic
Topic: GPS Clock Project
Replies: 8
Views: 22031

GPS Clock Project

In the "old days" GPS receivers connected to your computer using RS-232 cables. One of the RS-232 pins provided a highly accurate 1 HZ pulse, accurate to (i.e. +/- 3.0x 10EE-06 seconds or +/-3 micro seconds). Now days inexpensive GPS receivers connect via USB, and the 1 HZ pulse pin is gone. GPS rec...