[TowerTalk] metal-on-metal interference

[Jack Haverty]

Loose metal/metal connections can act as diodes and generate harmonics
of nearby transmissions, which can result in RFI.  This used to be a
common problem in the days of metal gutters and downspouts.  Perhaps
that's what was meant by "metal-on-metal rubbing causes RFI".

73,
/Jack
de K3FIV

On Fri, 2010-07-23 at 23:02 +0000, K1TTT wrote:
> No, metal on metal rubbing by itself doesn't cause interference.  But if
> there is a voltage difference between the parts that are rubbing THAT can
> cause interference.  
> 
> 
> David Robbins K1TTT
> e-mail: mailto:k1ttt at arrl.net
> web: http://www.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
>  
> 
> > -----Original Message-----
> > From: Michael Fox - N6MEF [mailto:n6mef at mefox.org]
> > Sent: Friday, July 23, 2010 22:03
> > To: towertalk at contesting.com
> > Subject: [TowerTalk] metal-on-metal interference
> > 
> > I've heard that metal-on-metal rubbing contact causes RFI.  But doing some
> > Google searches, I can't find a source of information.
> > 
> > 
> > 
> > Can someone tell me:
> > 
> > 1)  Is this true?
> > 
> > 2)  If so, is there a source for information?
> > 
> > 3)  Specifically, is there a general frequency range for the interference?
> > 
> > 
> > 
> > Thanks much,
> > 
> > Michael
> > 
> > N6MEF
> > 
> > 
> > 
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> > 
> > 
> > 
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