Question about Raymarine Raychart 435 GPS Receiver

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Rc435 works but looses it's fix periodically

I have a functioning rc435 on my sailboat. I have noticed that it looses it's fix every few minutes and the alarm sounds. After repeatedly inspecting all connections...I finally decided to examine the gps antenna that is mounted on the rail. I opened the basic case...two screws ...and examined the rg58x cable and found some electrical tape wrapped about it. Although the plastic gates had been removed in the channel were removed the tape was at that point. I removed the tape and found that the outer casing of the cable had been pierced. I must assume that there is damage at that point. When I opened the antenna package further...6 screws...I saw that the cable is soldered to a printed circuit card. The center of the cable is obvious but the shielding is in a rectangular metal fitting that is crunched on the shielding and then soldered to the circuit board. Of course I cannot find the metal fitting anywhere. I was going to cut the cable before the damaged area and reattach to the printed circuit card. Any ideas? Is the cable just a connection of an antenna to the rc435 or is something more sophisticated such as power going to the antenna. The dealer who installed this is gone...defunct so I am on my own. Are there some rf considerations? I know that the metal fitting also provide cable strain relief.

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The gates are to be removed only for surface mounting, and are there to prevent water ingress under the base. The cable would be crushed if the gate was not removed and the base was screwed onto the cable...
The antenna is powered from the base unit via the cable, but that's a simple DC circuit. The RF circuit is carried in the 'normal' way by the coax cable.
If you can clean the soldier from the scrunched fitting and get a good mechanical support, the soldier will provide the electrical contact. Be careful not to overheat the contact, and be sparing with the soldier when you reattach the braid. The braid is likely to be damaged / oxidized for some distance from the damage, so be sure you have enough slack in the cable. Raymarine's web site says you should see 4.8 / 7.2 Mega ohms of resistance across the antenna plug leads (different ohms depending on polarity of test leads) Good luck.

Posted on Oct 15, 2009

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