2018-08-04, 07:50 PM
Hi All,
Got my Moitessier hat from the post office this morning, and all setup and tested.
Initial results have been very promising - working really nicely so far, got good GPS lock without external antenna, and quite a bit of AIS data with a fairly small antenna.
One thing I've found is that the reception / general range I seem to get with the AIS seems to change quite significantly depending on the power source.
That is to say - when I use mains with a standard pi transformer, I get significantly better range and reception than when running off 12v->USB power.
I was trying to think about possible reasons for this:
- Could it be that there is more fluctuation in voltage on the 12v circuit?
- Could it be related to grounding?
Or...any other thoughts?
It was quite pronounced and noticeable - i'll see if i have some screenshots with openCPN on my phone for comparison.
I've attached a quick picture of the setup.
![[Image: tWzndJfTYVEwo6JPrq9CXp61jgaV1a2ydGGsJTgW...4-h1390-no]](https://lh3.googleusercontent.com/tWzndJfTYVEwo6JPrq9CXp61jgaV1a2ydGGsJTgWLBRxerD5SxZITcWo_9qGQmMpsJu87gkPqx2m9JXdTVtXcYkqOKwH8Ypwt8mwrXZMIWDiY9_5BroY7WItJqJbAZ0TQvlWTN02pBIHfZqml0RsyqCSL0OXkUxTQAw6BXmHtWhUXO5Cxgr-NJaqmRz2GdvH24Eya2HouTDz5H8VWK2cumZrypmsfFIZff73lKFRk48Snxltw4nBUOzcEIbSEw024RTyjt4xLvV8iW87s3uGdZNkLGdTh8xC0HXPsJ8NyANYwvpmj_GzRTzL_0jO-4qtBh6NGuiiZDfkIECMTtFoz5USgx9ANPCCP33WhAK0vYfbesjQRw5PcwnFDNriKCYZGCZoFOXTdYE0CRlsYKD7LLQ6Mh7YYCiozndmVFJycBkQfaWa4B6mSiHkT4on5WIIgDPAOO_Dv_fK1x98YM4bGnPq6hs0WP0d4De9yMJ8aEocK9YznIFR91hGM6_EIXV0KaqGpwnHFPMQJ9HyDQi-x3NdyTb1gZS_NTky9gLZhPvtVsAXpxROStY5ICR131cHgHN8g2eftw7nH5OTUx6m99y7Th-Zded7kaQ992MnPzTd8g7jxp0yKmA6RDULgNDCcDQyoBwWFUjQjWPvvdTEqANb3cS_euO4FA=w1044-h1390-no)
Got my Moitessier hat from the post office this morning, and all setup and tested.
Initial results have been very promising - working really nicely so far, got good GPS lock without external antenna, and quite a bit of AIS data with a fairly small antenna.
One thing I've found is that the reception / general range I seem to get with the AIS seems to change quite significantly depending on the power source.
That is to say - when I use mains with a standard pi transformer, I get significantly better range and reception than when running off 12v->USB power.
I was trying to think about possible reasons for this:
- Could it be that there is more fluctuation in voltage on the 12v circuit?
- Could it be related to grounding?
Or...any other thoughts?
It was quite pronounced and noticeable - i'll see if i have some screenshots with openCPN on my phone for comparison.
I've attached a quick picture of the setup.