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2.4 GHz 8.5 dBi Omnidirectional Wireless LAN Marine Antenna

By Russ, on March 3rd, 2007

If your are looking to increase the signal reception on your laptop while in the marina you may want to check out the antenna from Hyperlink Technologies.

Constructed for all weather operation, the YSC-HG2409UM-RSP features sealed collinear brass elements inside a durable UV-stable machine white fiberglass radome. A sealed end cap and drain holes in the base help prevent moisture build-up inside the antenna.

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Protecting electrical contacts

By Russ, on March 3rd, 2007

An American friend swears by spraying this stuff from Boeshield on just about everything… he says it is far more robust than WD40 and was developed by Boeing for aircraft use..their is also a testimonial at The Rust Store

From their web site they say:-

Above Deck: Spray on all metal surfaces and wipe off excess.

Mast Head Sheaves
Stranded Rigging
Swage Joints
Turn Buckles
Snap Shackles
Spinnaker Pole Ends
Sail Slides
Head Foils
Stanchion Bases
Hatch Hinges
Sliding Hatch Covers
Canvas Snaps

Below Deck: Spray liberally and Do Not Wipe

Instruments
Electronics
Battery Terminals
Running Lights
Electrical Connections
Engine
Steering Linkage
Thru Hull Fittings
Plumbing Joints
Bilge Pump

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AIS Class A – What is SOTDMA?

By Russ, on March 3rd, 2007

The operation of AIS depends on the Self Organizing Time Division Multiple Access (SOTDMA) data communication technology, which was developed in the 1980’s.

It allows for large numbers of transmitters to share one single narrow band radio channel, by synchronizing their data transmission to an exact timing standard. Under SOTDMA each minute of time is divided into 2250 time slots or 26.67 ms each time slot. With a transmission speed of 9.6 kbps this translates into 256 Bits/time-slot, sufficient for one AIS report.

The exact timing signal of the GPS receiver is essential to synchronize the time slots of communicating AIS ships,

…….Click AIS Class A – What is SOTDMA? …. to continue reading

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