The only rivet problem I had in about 10 years was the element to boom
mounting on one of the E240X elements that eventually elongated the rivet
holes and the element finally fell 120 feet to the ground. When I fixed it I
bolted the element mounts to the boom (which didn't help when a tornado got
the entire antenna the next year). No problems with the C3 or EF180B rivets.
73, Larry W6NWS
-----Original Message-----
From: Grant Saviers
Sent: Saturday, June 08, 2013 10:58 AM
To: Jim Thomson
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] F-12 340N question
You might consider replacing the rivets on general principles. My
EF-180C, which had been around for a while before I bought it, had about
30% of the rivets loose, a few missing, and the remainder ok. I drilled
out all of them and replaced them with cross bolted machine screws of an
appropriate diameter and spacing.
Grant KZ1W
On 6/8/2013 6:33 AM, Jim Thomson wrote:
I have a F-12 340N. Manual claims you can shift the ele resonance
points by adjusting the eles. 6 inchs per side = 100 khz.
Now do they mean tweak the .375 inch tips.... OR do they mean tweak the
adjustable linear loading rods ???? The tips are riveted.
It would make a lot more sense to tweak the LL rods..and leave the tips
alone. Makes more sense to me to make the ele max length
and use LESS LL if you want to move the freq up higher in the band.
Does anybody have experience with this..or know the answer ? The new
owner of F12 doesn’t know either.
tnx in advance.......... Jim VE7RF
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