[PVRCNC] Assembly Assistance

Sun, 2 Nov 2003 10:14:18 -0500

Hi Chris.  How did you measure the resonant frequency?  If the antenna was up 
in the air at operating height, that's fine.  On the ground resting on the 
reflector and pointing straight up works pretty good, too.  But if you had it 
in the horizontal plane and close to the ground, those measurements won't be 
reliable.

Other people on the list are more experienced at this, but that would be the 
first thing I would check.  I'm not at home this weekend but I'll help as I can 
(via email) over the next week, and maybe in person next weekend.

Please send all replies to the list so everyone can follow the correspondence.

73, Jim WW4M

Quoting Chris Plumblee <[email protected]>:

> Hi Folks,
> Just a quick note--I spent this morning with my Dad, WA4FJK, putting 
> together our TH6 in the backyard.  We got it all put together and 
> measured everything according to the manual for the mid-band settings, 
> and everything's good on 10m.  However, 15m and 20m are shot.  Somehow, 
> the resonant frequency according to the MFJ analyzer is low on 15m 
> (19MHz) and high on 20m (15MHz).  Looking at the diagram that I have, I 
> think the problem is with the rearmost element on the yagi, which acts 
> as a reflector on 15m and 20m.  There are a pair of 15m traps on that 
> element, which makes me think there may be a problem with one or both of 
> those traps.
> 
> I'd appreciate any information you could provide from these figures, and 
> of course I'll be glad to provide any more information that I have or 
> can make up.  However, what I'd really like, as you might imagine, is 
> somebody or some bodies who is/are willing to come out for an hour or so 
> one evening and lend your expertise for a few moments.
> 
> I'm located near Rolesville and can provide directions if you're 
> interested.  If you'd like to come later this week, I'll be gone but my 
> Dad will be here.  You can contact him at [email protected] 
> or [email protected] in the evenings.
> 
> I'd really love to have this in the air and working before phone SS, 
> since it's looking like it's not happening for CW SS this afternoon. 
> Back to the doublet for that one, I guess.
> 
> Thanks for the bandwidth, and 73.
> 
> Chris Plumblee
> -- 
> Chris Plumblee
> Wake Forest University '04
> President:  Wake Forest Univ. ARC WF4DD
> Voice:  336.758.8249
> Cellular:  336.817.3064
> Internet:  [email protected]
> 
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