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COMM antenna & Magnetmeter

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john.greenhalgh1(at)sky.c
Guest

Posted: Sat Aug 21, 2010 6:50 am Post subject: COMM antenna & Magnetmeter

I have a Magnetmeter in the top of the fin and want to place my COMM

antenna in the vertically in the fin also.  Can anyone advise if the

operation of the antenna would interfere with the operation of the

magnetmeter as the cable do pass close to each other.



Any assistance would be most welcome.  Regards John

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frans(at)privatepilots.nl
Guest

Posted: Sun Aug 22, 2010 5:45 am Post subject: COMM antenna & Magnetmeter

On 08/21/2010 04:47 PM, John Greenhalgh wrote:



 	  Quote: 	
		   I have a Magnetmeter in the top of the fin and want to place my COMM

 antenna in the vertically in the fin also.  Can anyone advise if the

 operation of the antenna would interfere with the operation of the

 magnetmeter as the cable do pass close to each other.


	


You need to keep the tips of the COMM antenna as far away from wires as

possible (including the antenna feed wire itself, which should leave the

antenna in a 90 degree angle). The magnetometer is no problem, but the

wires attached to the magnetometer are likely going to interfere with

the antenna. Keep this cable snug against the leading edge of the fin,

to maximize the distance to the antenna.

Furthermore, I'm puzzled why you want the magnetmeter to be in the top

of the fin? There must be more convenient places that are magnetically

neutral in your ship?



Frans

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budyerly(at)msn.com
Guest

Posted: Sun Aug 22, 2010 2:23 pm Post subject: COMM antenna & Magnetmeter

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  John,

 I couldn't agree more on Frans comment on the Magnetometer.

 The positions used in the last nine aircraft I worked on had the mag  overhead at the apex of the curve between the doors.  This works well  provided you don't have an old style headset with huge magnets in  it.  If you do, when you move your head, the mag compass will  move to follow.  The newer headsets in the last 5 years have no effect, and  the small screws and washers in the door hinge hardware, or overhead micro  switches or lights have no effect on performance of the magnetometer  either.

  

 Another position is aft of the baggage bay bulkhead, about on the joint  line of the fuselage top and bottom.  Many times I mount a ply and glass  platform and use stainless or nylon mounting screws to level and secure  it.  Make sure it is opposite to the main power leads if running them to  the rear.

  

 A few folks have put them in the wingtip when no power leads run out to the  tips.

  

 The places you don't want to place it is very near the mass balance arm of  the stab, near the trim or flap motors, fuel pumps or other high current draw  items.  I helped one client that put it in the port wing near his strobe  power unit....That was a bad idea also.

  

 The magnetometer installation manual gives detailed warnings on where not  to install.

  

 Bud Yerly

 Europa Dealer

 [quote]   ---

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