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Re: [TowerTalk] F12 Delta 240 performance observation

To: "" <>, "" <>
Subject: Re: [TowerTalk] F12 Delta 240 performance observation
From: SPWoo <>
Reply-to: SPWoo <>
Date: Wed, 19 Sep 2012 07:57:20 -0700 (PDT)
List-post: <">>
Hi Steve,

I don't get to see sunrises very often as I'm not a morning person, hihi.  My 
test was with Puerto Rico which is not exactly long haul DX.  I have worked 
many long-haul DX stations with the D240 but doing a performance test on them 
was difficult due to the low S/N ratio.  Perhaps this winter will provide me 
with more opportunities on performance testing.

Yes I still have the same mounting configuration.  The Skyhawk has insulated 
elements.  I get a ton of wind static from it.  But that's another topic for 
another day, hihi.

Since I'll be changing out my mast soon I'm considering of putting the D240 
under the Skyhawk.  This doesn't help with wind loading on the tower so I'm 
hesitant to make the switch.  Many others have it above the tri-bander will no 
ill effects.  Per the F12 gang (Tom and Mark) the D240 is designed to be 
mounted close (>4') to a tri-bander.

Copying W2IRT as he also has a D240.

Best Regards,
Jonathan Woo
(970) 646-1711

 From: Steve London <>
Sent: Wednesday, September 19, 2012 7:56 AM
Subject: Re: F12 Delta 240 performance observation

Before you conclude that your D240 doesn't have much pattern, run some more 
tests on DX signals. From your QTH in Colorado, I would recommend listening 
around your sunrise for signals from Japan and the far east.

Are you still using the Bencher Skyhawk/D240 stack as shown in the photos on 
your web page ? Does the Bencher Skyhawk insulate the parasitic 
elements from the boom ? If not, it is possible that the combined electrical 
length of the boom plus the uninsulated elements is close enough to a half 
wavelength on 40 meters to have significant interaction with the D240.

Steve, N2IC

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