dAISy

[DeborahLee]

Anyone try this yet?

[dnplmr]

I have the small one and it works great picking up the targets around us for around 10 miles here on Lake Erie. I am connecting to my laptop with usb. If I were to do it again I would get the duel channel one that has you can connect to a multiplexer or usb

[rgleason]

The dual one is for Raspberry pi only, but it works well. Opencpn runs on linux on rpi3

[waterman480]

They have a dual ch stand alone unit as well as the dual ch RPi hat version.

For sailing in any kind of traffic, I would not have a single channel receiver. I'm surprised anyone still sells a single channel unit. That is one of the issues for those using an SDR AIS receiver. Of course you can always hang two SDR dongles.

[AedanC]

There are now several drivers available for an SDR dongle that monitor both channels simultaneously. One example (and one that I have used) is aisdeco2 at http://xdeco.org/.

[rgleason]

Yes dual is better. The single channel should not be ruled out however, it works fine and does the job, but for $30 more I'd pock the dual. Adrean S. builds a good product and is responsive to user questions.

https://www.tindie.com/products/astu...ith-nmea-0183/

[TheOffice]

Works great!

[petter5]

I have seen reception distance close to 190 nautical miles under good conditions from a elevation of 25 meter and a Comrod AV15 antenna using the dAISy aishat on a raspberry pi.

the last month, average reception distance was 36 nautical miles and covering an area of 5099 km2 - Have used also the single channel dAISy, I can confirm that it works great, but the dual channel is better. Be sure to use a good quality coax and a decent antenna like the Comrod AV15.

Originally Posted by TheOffice

Works great!

[Auspicious]

Originally Posted by petter5

I have seen reception distance close to 190 nautical miles under good conditions

That's almost certainly tropospheric ducting that while common, especially in northern latitudes is not reliable or predictable. 30ish nm from a sailboat with a high antenna to commercial traffic is dependable. Use good coax and good connectors.

[petter5]

I know that reading of 190 nm was during foggy conditions - anyway you don't need AIS reception distance of 190 nm, but the average 36 nm reception distance over a month shows that the dAISy (hat) receiver is sensitive enough to plot even long distance AIS targets dependable when fitted to a decent antenna.

[CarCode]

Originally Posted by petter5

I know that reading of 190 nm was during foggy conditions - anyway you don't need AIS reception distance of 190 nm, but the average 36 nm reception distance over a month shows that the dAISy (hat) receiver is sensitive enough to plot even long distance AIS targets dependable when fitted to a decent antenna.

As said by Auspicious that is tropospheric ducting and has nothing to do with foggy conditions nor is it a sign of a good receiver.
See more about tropospheric ducting here:
Tropospheric Ducting Forecast for VHF & UHF Radio & TV

Gerhard

[petter5]

Well, it's also visual. If you look outside and it's heavy ocean fog, you regulary see increased reception distance.

Compared to a Kongsberg AI180 class A ais, when used on the same antenna, the dAISy (raspberry AIS hat) the dAISY does pretty well so the sensitivity for the reciever is absolutely fine.

Originally Posted by CarCode

As said by Auspicious that is tropospheric ducting and has nothing to do with foggy conditions nor is it a sign of a good receiver.
See more about tropospheric ducting here:
Tropospheric Ducting Forecast for VHF & UHF Radio & TV

Gerhard

[CarCode]

Originally Posted by petter5

Well, it's also visual. If you look outside and it's heavy ocean fog, you regulary see increased reception distance.

Compared to a Kongsberg AI180 class A ais, when used on the same antenna, the dAISy (raspberry AIS hat) the dAISY does pretty well so the sensitivity for the reciever is absolutely fine.

You may trust your personal feelings, I believe more in science-based facts.
Sensitivity is measured e.g. in dBm.

Gerhard

[RHarriss]

Yes, just installed a 2+. Attached it to a vYacht router, adjusted the input port to the correct baud rate and it worked.

[jacrider]

All: I am interested in adding AIS to my setup based on a RaspPi3 and OpenCPN.

I like the look of the dAISy HAT for the RPi.

My question is what are people using for the antenna? A splitter on the VHF antenna? A dedicated antenna? Trying to understand the required installation.

Many thanks.