Boat Forum / Electronics / March 2004

I'm not an engineer but it sounds to me like your pump is noisy because
it's running no load. ie) You said it forms "an air lock".
If this if true then the motor will wind up to no-load speed, which
could be several times the working speed.

There is something I dont understand about radars. I have a JRC 1500 radar
(16 miles), in according to the manual, the antenna is supposed to send out
a radarbeam of 2000 watt. My engines (yanmar 4lha htp) generator produses
12v 80A (1120watt).

I am installing radio equipment on an aluminium boat (Ovni 435)
In order to avoid electrolysis, what is the best way to ground vhf and ssb
transceivers on a aluminium boat?
I have to use a "floating power supply", so neither the positive nor

With the cost of instrument maxis (mast displays) so high, has anyone out
there come up with a simple solution? It seems like it would be fairly easy
to have a program to read and direct the NEMA sentence to a commonly
available LCD display. Use a plam pilot or similar to run a ...

My Jabsco toilet pump needs to be slowed down, what is the simplest
way to reduce speed, by voltage?  It also is very noisy, hopefully
reduced speed will quiet it down too.
Dave

I'm installing a ST5000 autopilot control unit with an Alpha Marine linear
actuator. The rudder position feed back from the Alpha is 10K variable
resistor (pot), 5K/5K is rudder centered..
I'm not sure what the Raymarine control unit is looking for.. The input on

I finally got my 1721 sticky track ball problem solved.. I opened the radar
case and expected I would have reasonable access. What I found was the
assembly would require major disassembly of the radar display.
I'm still not sure of why it was difficult to turn, but I finally took a

I have a Garmin GPS Map76s for sale. It includes a great portable
mount for car or boat, car adapter and tons of software for water and
road.
I'm asking 350 for everything.

looking for a used gps with anchor alarm and outside antena.
Any takers?
thanks
Sterling

i want a way by c++ or assembly to get the USB flash memory serial
number
i don't know if it possiple or not i hope i can find a way for that as
fast as possible

I noticed a IC-M600 with a AT120 tuner on ebay.. Not much bidding activity
and current bid is pretty low. Item number: 2464392650
I'm wonder about opinions on this as a marine SSB? Any good? Better than
nothing?  etc.

I am in the market for a small fishfinder for my boat. I have narrowed it
down to these two units . The Garmin is more watts peak to peak than the
Furuno,  most of my fishing is saltwater , and some areas are very deep and
you lose the bottom . I am replacing a Lowrance x-25 which ...

I've got a unit that is about 7 years old.
Recently, it started turning erratically, causing the display to
pop the Antenna not rotating message, and shutting off.
The antenna's turning, but slows about every 1 to 1.5 revolutions.

I have a 34 foot sloop which I bought six years ago on Kentucky Lake
near Paducah. I motored it up river to Guntersville Lake in North
Alabama. I sailed her on Guntersville Lake on the very few days that I
had off and the wind was blowing. That however, was no more than a few

New boat (32ft power) and I can't believe how many electronics choices
are out there. I want GPS, chartplotter, radar, fishfinder. I care
most about chartplotter. Won't use radar or fishfinder often (but
enough that I need it). I see three choices -