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[TowerTalk] TH7DX INFO

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Subject: [TowerTalk] TH7DX INFO
From: (Roderick M. Fitz-Randolph)
Date: Tue, 18 Mar 1997 13:09:40 +0000
>Dear friends,
>A local ham is selling a Hy-Gain TH7DX beam. My current set up has a Mosley
>TA-33, in other words, a 3 el. triband Yagi. Is it worthy to replace the
>TA-33 with the TH7DX? Does anyone have compared the TH7 with a 3 el triband
>beam? Of course the TH7 is superior but how much better it really is. I
>mean, in DB what would be the differences between the two beams considering
>the same height per band?
>I have heard that the Hy-gain engineers optmized the F/B and didn't care
>much about FWD gain! Is that right? Is it much worse compared to the KLM
>KT34XA? Also what is the difference between the TH7DX and TH7DXS?

Carlos, I do not know what the gain of a TA-33 is compared to a TH7DX but
I suspect the TH7DX will provide about 2 dB or more gain (on average on the
three bands) than the TA-33..... that's just a guess.  My guess is based
on the length of the boom, the empirically optimized TH7DX design and the
number of contesters that use the TH7DX.  I know of some hams that would
kill for another 2 db!!!! (myself, for one!  My wife for another!!).

As for the statement that the Hy-gain engineers optimized the F/B and didn't
care about the Fwd gain: don't you believe it.  That is hogwash.  Otherwise,
why would so many DXers and Contesters use the TH7DX?

Good luck in your decision.  Rod, W5HVV

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