[TowerTalk] adding 40 mtrs to C3

[Chuck Lewis]

Bob, I bought mine as a C-4, which had the saddle for the 40M element already mounted, so I can't comment on installation. The location for the 40M element is shown on my drawing (# dwc4.003 - 1995) as 54" from the 20M reflector centerline. My mast attachment is 87"  from the reflector end of the boom, so the 40M element would be ~87-54 = ~33" from the mast toward the reflector. Bear in mind that F12 had several revisions of their drawings over the years, and these might not be current. Best to check with Mark Hooper @ F12 for the latest dimensions. 

Mine works quite well; I appreciate the ability to rotate the dipole, and it's bandwidth is very close to the advertised figure. I did find that I had to stretch the hairpin coil more than I had expected, in order to get the SWR minimized at resonance and thus full bandwidth. It's been up for well over ten years with no failures and with only minimal maintenance. 

There have been several posts on this reflector about substitute materials for the linear loading wire...those should be in the archives. 

Good Luck! You'll enjoy it.


73, Chuck, N4NM 


 ----- Original Message ----- 
  From: Bob K6UJ 
  To: towertalk at contesting.com 
  Sent: Tuesday, October 11, 2011 4:07 PM
  Subject: [TowerTalk] adding 40 mtrs to C3


  I have a Force 12 C3 and I'm considering buying their 40 meter dipole to mount on the boom of the C3.

  A couple of questions for someone that has done this to their C3:

  How does it perform on 40 meters?
  I have a copy of the C4 manual (which is a C3 with the 40 meter dipole) and it doesn't show 
  a dimension locating the 40M dipole on the boom, is there already a pre-drilled hole for adding the dipole ?
  Lastly, how difficult was it to install on the boom of the C3 ?  I think my C3 has their easy on mount,
  can I rotate the C3 on the mast and install the dipole without taking the C3 down off the tower ? (I hope)

  Bob
  K6UJ
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