GPS
Submitted by Steve Richards on Sun, 2008-01-27 12:03
Hi everyone, bought a GPS chart plotter yesterday NAVMAN 5507 with the whole of OZ C-map. My question is in the instructions ( yes i have read them, or at least some of them,lol), it says that the external areial has to be 10ft from any other radio signal. Which is a bit of a problem seeing as i've got my 27meg radio(existing) and an AM-FM radio that also has to go in. I wanted to put the areial on the dash to protect it and the instructions say not to mount it too high because of boat roll, any suggestions or advice would be greatly appreciated.PS, where's all the topics and last posts gone.
Dreamweaver
Posts: 4688
Date Joined: 01/12/07
5507 Reply
G'day Steve
I have the Navman 5500 (gps) and 4500 (fish finder).
By aerial for your 5507, are we talking a mushroom? Let's face it 10' is a little impracticle, unless you're fitting it to a ship. I have an am/fm helical, 450 mm away is the mushroom, then 450 mm away is the VHF helical. Never had any problems. All are mounted on a targa bar aloft, which also includes the all round (anchor) light and a fair sized (bridge) remote spotty. Never had any probs with boar role as far as the mushroom goes.
I'm no expert, but that's my experience.
Colin
RECFISHWEST Member 576
VMR 610 - Albany Sea Rescue - Mariner 421
Soon to be de "dreamweaver" ed!
Steve Richards
Posts: 53
Date Joined: 10/10/07
Cheers
Thanks Colin thats exactly the sort of advice i was looking for. EXPERIENCED advice. Am going to mount the AM-FM aerial (helical ??) on the opposite side of the rocket launcher to the 27 meg. The mushroom will go in the middle of one of the windows on the dash.Thanks for your reply.PS have you ever fished off of the rocks between LOWLANDS and BORNHOLM BEACH in the boat.
Dreamweaver
Posts: 4688
Date Joined: 01/12/07
No Steve
No haven't Steve. (Lowlands/Bornholm).
By the way, helical antenaes get there name from the fact that the 'wire' is wound around the (usually) fiberglass (or similar) core. The reason for this is that every frequency needs a tuned length of wire and the lower the frequency, the longer the wire. So, being helically wound, it allows for a lower (workable) vertical antenae. Unless you get fairly decent sized 27 meg antenaes that (say) mount off the coamings with an elbow, then you are looking at a 5/8 ground plane.
I could go on about dipoles, quads, stacked arrays, SWR, gain etc. But that might get a bit technically tedious.
Nice lookin boat too Steve!
Colin
RECFISHWEST Member 576
VMR 610 - Albany Sea Rescue - Mariner 421
Soon to be de "dreamweaver" ed!
bouttime
Posts: 703
Date Joined: 27/07/06
Just be careful about
Just be careful about nounting the GPS reciever on the dash of your boat. If there is a windscreen or canopy in the way tou may find your signal drop out every now and then. Had this problem with mine til i mounted it ontop.
Dreamweaver
Posts: 4688
Date Joined: 01/12/07
It is a neat trick
Steve - once again, you're welcome. Colin
RECFISHWEST Member 576
VMR 610 - Albany Sea Rescue - Mariner 421
Soon to be de "dreamweaver" ed!
thebear
Posts: 246
Date Joined: 09/06/07
A mate of mine did the vacum
A mate of mine did the vacum thingy once..... He claime that his nob is still sore. lol
Nah seriously great idea to get pull throughs, through the tube.
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