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ulysses

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About ulysses

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  1. All that metal around the antenna can't be good. Also, that connector should have self-amalgamating tape (see Stan's article : http://honeynav.com/vhf-and-ais-masthead-antenna-installation-and-coax-testing ). I think that antenna has a (TNC?) connector on the bottom, so it looks like there is a external adapter. At those frequencies, every connector adds loss (and risk of leaks) and should be avoided. I'd be interested to know what your symptoms were. If it's intermittent, it could be the installation. If it didn't work at all, it could be "user error". I spend a few weeks w/
  2. gpsbabel might do it ...
  3. Some people like the RopeAntenna : http://www.fairwindsdev.com/ropeantenna.com , which is an antenna inside a braid of a rope. There is a guy on the Facebook marine HF forum that recommends something similar. IIRC, he uses stainless steel rope and uses weed wacker line w/ a surgeons knot.
  4. Fridays forecast : https://imgur.com/a/kdALiYJ
  5. I've been working on some scripts to visualize the NOAA current models (see previous post below). I've made some plots for Thursdays "Big Boat Series" : https://imgur.com/a/CwieKA1 It's a similar area as the chart in the sailing instructions (City front on the bottom, Golden gate to the left, Treasure Island to the right). I added some marks : Harding rock & Blossom rock, etc. The NOAA forecasts go 48 hours into the future (and run every 6 hours), so after 4pm PDT, I can plot the currents for Fridays races. If people are interested, I can post them here. P
  6. Anyone have ideas on how to make an inexpensive GPS "tide stick" ? Unsinkable would be nice, ie some sort of closed cell foam, but PVC might be easier. I'm thinking of transmitting on APRS. I chased some RS41 radiosondes that could be recycled : http://github.com/Qyon/STM32_RTTY I'd like to validate the NOAA tide models :
  7. Thanks, but I'm hoping for something simpler. The hardware could be as simple as a $10 Nordic dongle ( pca10059 ) and a li-ion battery. Perhaps it would emulate a DST810. I'd like to send data to an iPad, Vakaros or Sailmon. Too bad racegeek folded. They had a paddlewheel input.
  8. I'd like to connect a Signet "hall effect" paddlewheel (or perhaps Garmin GST43) to a gadget that will transmit the data onto Bluetooth. Do you know of such a device ? TIA
  9. I've been tinkering with this. This page talks about a thredds server : https://tidesandcurrents.noaa.gov/ofs/cbofs/cbofs_info.html . It's possible to get a netcdf file from there. Eg : u0=https://opendap.co-ops.nos.noaa.gov/thredds/dodsC/NOAA/SFBOFS/MODELS/2021/08/28/nos.sfbofs.regulargrid.f048.20210828.t21z.nc nccopy -V u_eastward,v_northward $u0 $(basename $u0) ... and then view that with ncview. Might have to convert to grib for expedition. NB : this includes 100 "depth levels". Dunno how to get "nccopy" to only get the surface currents. I've b
  10. You could use a Signet (blue top) and a Garmin GST10 to get N2K ...
  11. ulysses

    Vakaros

    Is there a BT gateway you recommend ? In particular, one that can take pulses from a Signet Blue Top paddlewheel ?
  12. It's calibrated in milli-knots ...
  13. That sounds like "owners boatspeed". How do you calibrate it ? Is there an app for that ? I've heard of a j70 using this combo (w/ a B&G display).
  14. What do you use to convert Signet Bluetop paddlewheel to nmea2000 ?
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