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RF ground

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rdunhamtn(at)hotmail.com
Guest

Posted: Sat Nov 04, 2006 4:25 am Post subject: RF ground

Fellow Nuckollheads,



I've been doing a lot of reading on-line concerning eliminating RFI in the 

HF band in my mobile 10/11 meter installation. The current wisdom seems to 

be to "ground everything" which I am in the process of doing. BUT... All the 

ham gurus recommend using tinned braided wire for RF grounding in preference 

to the usual copper w/ insulation "hook-up" wire. I can't figure out why 

this would matter. And then, of course, the real meat of the matter... If I 

do this to my SkyRanger, will it decrease RFI through my VHF Comm???



Rodney in TN



_________________________________________________________________

Use your PC to make calls at very low rates 

https://voiceoam.pcs.v2s.live.com/partnerredirect.aspx

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N6030X(at)DaveMorris.com
Guest

Posted: Sat Nov 04, 2006 6:46 am Post subject: RF ground

I hope that's just an 11m installation   But where is the RFI occurring?



I'm not sure what they are talking about re: tinned braided vs 

copper, but it sounds like nonsense to me.  Unless you're dealing 

with high power levels and very tiny hookup wire, the RF is going to 

get grounded either way.  RF travels down the circumference of wire, 

so larger diameters are better - to a point.  You won't notice the difference.



Your VHF comm radio should already have good shielding, so going 

crazy with grounds is not necessary.  A single ground should 

suffice.  What RFI are you trying to eliminate?



Dave Morris

N5UP

Amateur Extra Class



At 06:24 AM 11/4/2006, you wrote:

 	  Quote: 	
		  

<rdunhamtn(at)hotmail.com>



Fellow Nuckollheads,



I've been doing a lot of reading on-line concerning eliminating RFI 

in the HF band in my mobile 10/11 meter installation. The current 

wisdom seems to be to "ground everything" which I am in the process 

of doing. BUT... All the ham gurus recommend using tinned braided 

wire for RF grounding in preference to the usual copper w/ 

insulation "hook-up" wire. I can't figure out why this would matter. 

And then, of course, the real meat of the matter... If I do this to 

my SkyRanger, will it decrease RFI through my VHF Comm???



Rodney in TN



_________________________________________________________________

Use your PC to make calls at very low rates 

https://voiceoam.pcs.v2s.live.com/partnerredirect.aspx

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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nuckollsr(at)cox.net
Guest

Posted: Mon Nov 06, 2006 7:21 am Post subject: RF ground

At 07:24 AM 11/4/2006 -0500, you wrote:



 	  Quote: 	
		  

<rdunhamtn(at)hotmail.com>



Fellow Nuckollheads,



I've been doing a lot of reading on-line concerning eliminating RFI in the 

HF band in my mobile 10/11 meter installation. The current wisdom seems to 

be to "ground everything" which I am in the process of doing. BUT... All 

the ham gurus recommend using tinned braided wire for RF grounding in 

preference to the usual copper w/ insulation "hook-up" wire. I can't 

figure out why this would matter. And then, of course, the real meat of 

the matter... If I do this to my SkyRanger, will it decrease RFI through 

my VHF Comm???



Rodney in TN


	


     Most of my experiences dealing with RFI problems

     in aircraft have root causes founded in poorly

     designed hardware or inattention to installation

     requirements. These often create situations where

     the owner/operator is struggling to 'band-aid' the

     system to accommodate the deficiencies over which

     the fellow has no control.



     Adding bond straps, shields, moving bundles, etc

     are all part and parcel of the RFI alchemists ingredients

     that are OCCASIONALLY components of a recipe for success.



     A well considered approach to solving a RFI problem

     requires that you identify the antagonist and deduce

     the exact propagation mode from antagonist to victim.

     More often than not, the real success comes from fixing

     some deficiency in the antagonist or its installation

     as opposed to "helping" victims live in the unhealthy

     environment.



     We need more details about your system: Power levels,

     antenna and feed line installation, etc. What systems

     are victimized by the transmitter?



     Bob . . .

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rdunhamtn(at)hotmail.com
Guest

Posted: Mon Nov 06, 2006 2:35 pm Post subject: RF ground

Sorry for the confusion.



I'm not trying to solve an RFI problem. I'm setting up the radios and want 

maxiumum transmit and receive abilities and clear audio on both ends. I was 

thinking that RF grounds might make the "system" (XCOM/Sonex or CB/F150) 

more effecient. I was wondering if braided wire bonding straps were really 

better than stranded wire... and if so, why??? And what's the difference in 

bonding between VHF (air) versus HF (truck) as far as technic is concerned. 

I'm just one of those wierdos that thinks it's cool to hear a guy in the 

pattern in Fort Payne, Alabama when I'm in the pattern in Sweetwater, 

Tennessee :O)



Rodney in TN



What's so really cool about flying is all the hobbies within the hobby!

DO NOT ARCHIVE



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Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Mon Nov 06, 2006 7:16 pm Post subject: RF ground

In a message dated 11/06/2006 4:37:39 PM Central Standard Time, rdunhamtn(at)hotmail.com writes:

  	  Quote: 	
		  I'm just one of those wierdos that thinks it's cool to hear a guy in the 

pattern in Fort Payne, Alabama when I'm in the pattern in Sweetwater, 

Tennessee :O) 	


 >>>

 You ain't got no monopoly on weirdness, specially 'round these parts- wierd thing is that I can communicate with planes in the pattern at airports 100+ miles away on my Microair 760 and still can't hear the damn Cherokee with the ancient radio 1/4 mile away in the pattern at my home base- the really cool thing is that the staff at my home base (SYI) is so cool that they hear me coming in and offer alerts as necessary if they know the offending Cherokee is airborne and nearby- anybody else base at an airport that cool?  

  

 Totally shameless plug: Did I mention what a really COOL airport Shelbyville, TN is?  Best gas prices anywhere and if ya stop in, grab aholt of the manager and challenge him to his claim that he is the first dude to loop an F-111...

  

 RVs are GREAT & SYI is too!

 Mark do not archive

  [quote][b]

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_________________
From The PossumWorks...

nuckollsr(at)cox.net
Guest

Posted: Tue Nov 07, 2006 4:52 am Post subject: RF ground

At 05:34 PM 11/6/2006 -0500, you wrote:



 	  Quote: 	
		  

<rdunhamtn(at)hotmail.com>



Sorry for the confusion.



I'm not trying to solve an RFI problem. I'm setting up the radios and want 

maxiumum transmit and receive abilities and clear audio on both ends. I 

was thinking that RF grounds might make the "system" (XCOM/Sonex or 

CB/F150) more effecient. I was wondering if braided wire bonding straps 

were really better than stranded wire... and if so, why??? And what's the 

difference in bonding between VHF (air) versus HF (truck) as far as 

technic is concerned. I'm just one of those wierdos that thinks it's cool 

to hear a guy in the pattern in Fort Payne, Alabama when I'm in the 

pattern in Sweetwater, Tennessee :O)


	


    What are you going to "bond" and to "where"?

    When we qualify various appliances both for their

    potential roles as antagonists and as victims

    the equipment is tested "as installed" in the

    airplane.



    If you find that there is value in adding a bonding

    strap to cure a problem, then this is indicative of

    poor appliance design and deficient testing.



    Unless the manufacturer's installation instructions

    call for extra-ordinary additions of RF bonding

    leads, then adding them just for the heck of it

    (or in hopes of achieving performance nobody else

    has) is wishful thinking.



    Bob . . .



      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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