Topband: [Antennaware] New K9AY Observations

[Joe Subich, W4TV]

> Coupling to "something" is the strongest possibility. It can 
> be the radials as well as the radiator of the Inv-L. I would 
> recommend a choke at the loop connection.

I would also suspect re-radiation from the inverted L - 
particularly since directivity falls apart as the frequency 
moves closer to the "resonant" frequency of the inverted L. 
The vertical wire on the L should be "floated" in receive to 
see if that is a factor. 

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: antennaware-bounces at contesting.com 
> [mailto:antennaware-bounces at contesting.com] On Behalf Of K9AY
> Sent: Tuesday, October 14, 2008 9:58 AM
> To: RFD; antennaware at contesting.com; topband at contesting.com
> Subject: Re: [Antennaware] New K9AY Observations
> 
> 
> Comments interspersed...
> 
> > I notice that directivity of the loops on the BC band from below 
> > 1600khz is dramatic to say the least.
> 
> That's a good start. Things are not a total mess!
> 
> > On 160M however directivity of the loops is not dramatic at 
> all. Many 
> > signals are the same strength on all loops..... So I am concluding 
> > that the tower and the Inv L are screwing up the loops on 160M.? ...
> > Also I am not yet using a common mode choke on the RG6 feedline of
> > the loops.
> 
> > 73 Frank VO1HP
> 
> Coupling to "something" is the strongest possibility. It can 
> be the radials 
> as well as the radiator of the Inv-L. I would recommend a 
> choke at the loop 
> connection. Be sure the control wires are choked, too. These 
> wires may be 
> the culprit, or perhaps an accomplice that aids coupling to 
> the radials. The 
> Array Solutions loop box has instructions for separating the 
> antenna and 
> feedline grounds -- this may help as well.
> 
> 73, Gary
> K9AY 
> 
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