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Antennaes and primer

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n395v

Joined: 10 Jan 2006
Posts: 450

Posted: Tue Nov 14, 2006 8:14 am Post subject: Antennaes and primer

I have all my antennas..com, nav, and 2 gps antennas under  fiberglass. The GPS antennas are just forward of the wind screen, theNav antenna is in the belly and the com in the leading edge of the vert stabilizer.



The only difference between my plane and the prototype is the primer and my control surfaces (elevator, rudder, ailerons, and flaps) are carbon fiber not fiberglass.



The Prototype used PPG K36 with K201 hardener, I used Dupont Nason 421-19 with 483-87 hardener.



The MDSS lists aluminum, iron sulfate and carbon black in unknown quantities in the DuPont product. These are not listed in th MDSS for the PPG product.

I find I transmit and recieve normally on frequencies below 125.00 but TX and RX is very weak above this. My Nav reception is exceedingly weak across the board and both GPSs take up to 10 minutyes to lock and then only see 4 sats.



The com nav bench checks fine and when I recieved the BMA Efiss and tested them in the car they locked on in seconds.



Can the stuff in the primer cause this? If so how large an area around the antennas do I need to sand.

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Milt

nuckollsr(at)cox.net
Guest

Posted: Wed Nov 15, 2006 6:24 am Post subject: Antennaes and primer

At 08:14 AM 11/14/2006 -0800, you wrote:



 	  Quote: 	
		  



I have all my antennas..com, nav, and 2 gps antennas under  fiberglass. 

The GPS antennas are just forward of the wind screen, theNav antenna is in 

the belly and the com in the leading edge of the vert stabilizer.



The only difference between my plane and the prototype is the primer and 

my control surfaces (elevator, rudder, ailerons, and flaps) are carbon 

fiber not fiberglass.



The Prototype used PPG K36 with K201 hardener, I used Dupont Nason 421-19 

with 483-87 hardener.



The MDSS lists aluminum, iron sulfate and carbon black in unknown 

quantities in the DuPont product. These are not listed in th MDSS for the 

PPG product.



I find I transmit and recieve normally on frequencies below 125.00 but TX 

and RX is very weak above this. My Nav reception is exceedingly weak 

across the board and both GPSs take up to 10 minutyes to lock and then 

only see 4 sats.



The com nav bench checks fine and when I recieved the BMA Efiss and tested 

them in the car they locked on in seconds.



Can the stuff in the primer cause this? If so how large an area around the 

antennas do I need to sand.


	




    Without hard data from experiments in the laboratory and/or

    repeatable experiments in the field, I doubt that anyone can

    give you more than WAGed advice. It's a given that ANYTHING

    you place between your antenna and some signal of interest

    has an effect. The question becomes to what degree and what

    level of acceptability.



    But unless someone here on the List has encountered and

    massaged you particular combination of conditions before,

    we're hard pressed to be of meaningful assistance. Sorry.



    You're in position to offer us data from your own experiments

    . . . and perhaps someone will come along later and repeat

    to confirm/discount your findings.



    Bob . . .

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n744bh(at)bellsouth.net
Guest

Posted: Wed Nov 15, 2006 9:16 am Post subject: Antennaes and primer

The primer may be your problem.  I've got a Glasair Super 2 and I used PPG 

K36 primer and PPG Concept paint and have had no problem.  My GPS antenna is 

located, like yours, ahead of the windscreen area inside of the airplane. 

My comm antenna is located in the vertical stab.



Bill

---

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n395v

Joined: 10 Jan 2006
Posts: 450

Posted: Sun Nov 26, 2006 11:41 am Post subject: Re: Antennaes and primer

Well for the most part it wasn't the primer. Sanded the primer of and the GPSs got a little better but com nav stil were pretty much TU.



Replaced all the coax connectors I had put in, still no joy. Hooked up my portable nav/com to the antenna cables and it worked great.Bench checked th com/nav... no problems.  Must be the tray...not quite. When I purchased the units Garmin compels their suppliers to wire the trays with pigtails including antennaes. You guessed it the pigtail coaxs were poorly assembled with the inner insulator melted. The com had 2 shield whiskers touching the center conductor. The nav was a dead short.



Thanks to all for the input.

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Milt

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