[CQ-Contest] A3S or TH-3JRS or ELSE?

Richard DiDonna NN3W nn3w at cox.net
Wed Aug 22 18:41:11 EDT 2007

I was grappling with this issue for my home installation.  I used a TA-33jr as my first yagi when I lived in California.  It worked well, although it was sorta narrow in terms of bandwidth.  

In my new home, I've been limited by a tight turn radius, and a weight restriction which frankly limits me to a radio shack mast (guyed to death to keep it from falling over).

My choices were A3S, TH3jrs, MA5B, and TA33jr.  The A3 is probably the winner in terms of gain, but its the heaviest and has the largest turn radius.  The TH3 and the TA33 are only 20 pounds which is fine, but they cannot handle more than 700 watts SSB PEP.  On RTTY, we're probably down to 300 watts.  The MA5B can handle the same power, is the smallest, but has the lowest gain and is apparently very finicky in terms of tuning.  its also relatively expensive.  No real great options.

I recently discoverd the Mosley MP-33 which covers 20, 15, and 10, has the same gain as the TA33, weighs 21 pounds when assembled, and handles 1500 watts CW PEP (500 to 600 watts on RTTY).   

If you can beg them into expediting an order, go with the MP-33.  If not, consider the A3 if you have enough turn radius.

73 Rich NN3W

----- Original Message ----- 
From: "Bob Schreibmaier" <k3ph at ptd.net>
To: <cq-contest at contesting.com>
Sent: Wednesday, August 22, 2007 3:39 PM
Subject: [CQ-Contest] A3S or TH-3JRS or ELSE?

> While the A3S is rated at 1500 watts PEP and the
> TH3 Junior at 600 watts PEP, I seriously doubt
> that the traps will take anywhere near that during
> RTTY service.  And the Mosley TA-33 "senior" is
> rated at 600 watts RTTY, while the "junior" is
> rated at 250.
> My experience with trapped tribanders is that
> they work better than they have any right to.
> However, if you want to run power on RTTY, they
> are not the best choice.
> Good luck with whatever you decide.
> 73,
> Bob
> K3PH
> -- 
> +----------------------------------------------+
> | Bob Schreibmaier K3PH | E-mail: k3ph at ptd.net |
> | Kresgeville, PA 18333 | http://www.dxis.org  |
> +----------------------------------------------+
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