[TowerTalk] A3S Tuning Question

[Steve Katz]

First, I'd be really sure the traps are in the right positions, and re-check all dimensions.  If all is well, you need to shorten the elements a bit (certainly the driven element as a minimum).  When you shorten them for 10m, you're obviously also shortening them for 15 and 20m as well, so that one adjustment may be all you need to make.  



-----Original Message-----
From: mrlogs [mailto:mrlogs at verizon.net]
Sent: Thursday, March 19, 2009 9:54 AM
To: Steve Katz; towertalk at contesting.com
Subject: Re: [TowerTalk] A3S Tuning Question


I threw a connector on the end and used the AEA analyzer with the tower 
standing up..not cranked up but at 21 ft..and it's still the same..low on 
all bands... On 20 lowest at 13900(1.63) , on 15M lowest at 20900(1.1), and 
on 10M lowest at 27600(1.08)...I assume just shorten the dipole a bit?
                                   Tom  N3ZC



----- Original Message ----- 
From: "Steve Katz" <stevek at jmr.com>
To: "mrlogs" <mrlogs at verizon.net>; <towertalk at contesting.com>
Sent: Thursday, March 19, 2009 11:43 AM
Subject: RE: [TowerTalk] A3S Tuning Question


Tom, I agree and I've tested HF beams only a few feet above ground with the 
boom vertical and "aimed" towards the sky.  Usually I've accomplished that 
by laying the reflector across a couple of wooden saw horses and propping 
the boom up against an elevated wooden deck.

The "tuning" usually does come out about the same as having the antenna 
installed up much higher, at its final resting place.

If your A3S is resonating below the bands on all bands, sounds like you need 
to shorten the tubing length between the boom and the first (10m) traps. 
However be really sure the traps are installed in the correct positions and 
are oriented the correct way before changing tubing lengths!

I've installed a few A3S's over the years and never had to change the 
dimensions from the factory recommendations, but then that was several years 
ago.  Possibly they factory goofed since then and something's wrong with the 
traps, or any number of variables.

73

Steve WB2WIK/6

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com]On Behalf Of mrlogs
Sent: Thursday, March 19, 2009 8:37 AM
To: towertalk at contesting.com
Subject: [TowerTalk] A3S Tuning Question


They said, in the manual..you could test it facing up a few feet off the 
ground...Haven't done it at 40 ft yet,,
                Tom  N3ZC
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