I’m hoping someone can help me out…
I got one of the Venus634FLPx GPS IC’s. I knocked up a board with one of the SFE GPS Chip antennas and an FT232RL. Hooked it all up and plugged it in.
So far so good, I get the NMEA stream in the SKYTRAQ GPS Viewer software. However it doesn’t appear to be able to find any satellites. I reset it a few times and supplied initial position and time (part of the reset feature in the software) and woohoo, I started to get somewhere. I eventually got a good lock seeing 6 or 7 satellites with a DOP down to 1.5. This was out in the conservatory, so I disconnect it from the power take it in too see if I can get a lock indoors, no luck. Take it back out, now nothing, nothing, nothing?!? Argghh
The other odd behaviour I see is that most of the binary messages are OK, i.e. requesting the software version etc. However if I try to download AGPS data to the GPS it times out. The only way to get anything out of the GPS again it to power cycle it or use the reset pin.
Any help would be appreciated.
Arran