[TowerTalk] HyGain TH7 optimized dimensions?

[Jim Harvey]

Brad,

A tower talk post by WB0DGF in 1997 mentioned that Hygain added a "DX"
setting to the TH7DX in the early 1990's. This involved setting RDE-2 to 33
inches and FDE-2 to 42 inches. This effectively lengthened each driven
element by 2 inches on each side before the traps. He states that this
reduces the swr to approx 1.5-1 at the lower band edges.

The TH7's in my stack have used this setting for years. 

73, Jim N0AV




-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Brad Anbro
Sent: Friday, April 17, 2009 5:04 AM
To: TOWERTALK
Subject: [TowerTalk] HyGain TH7 optimized dimensions?

Hello all,

Quite some time ago, a person came out with "optimized
dimensions" for the HyGain TH7 triband yagi; I believe it
was a former engineer for (pre-MFJ) HyGain. I can't
remember if it was for the TH7 or the TH3...the optimized
dimensions were supposed to allow for lower SWR fig-
ures at the bottom of the CW sub-bands.

If anyone can help me with this, I'd sure appreciate it!
Thanks in advance...

73 de Brad, N9EN @ Radio Free Roscoe (IL)R
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