Bruce.
I don't understand your math. How can the T10
gain be 6.5 db and be 5 to 10 db above other
tribanders which have demonstrated gains in the
5db area?
If you are keeping the band open this much longer
and signals are as much better as you say, it has
to be location. There is no other physical
explanation. Perhaps you should consider modeling
your QTH with the YTAD program to see what really
is going on.
K7LXC did his comparison study to factor out
location differences and bring some sanity to the
claims of my antenna is 10 db better than yours.
73 de Brian/K3KO
Bruce Marton wrote:
>
> To those who are interested,
> I have a T 10 Tennadyne. It has been in the air about 11/2 years and I
> will report that the performance is outstanding. It is at about the 65
> foot level on top of a 45 G Rohn and the top set of guys are Philistrand
> (is that how they spell it?). I have several friends near me with
> antennas ranging from TH7DXX and KT34xa's to Quads and X9's. Under most
> situations, the T 10 out performs these other antennas using the same
> output levels of power. The quad seems to be the closest and X9 is
> right in there too. But the tribanders are no contest, usually I can
> keep the band open at least another 30 to 45 mins after the tribanders
> leave the picture. Plus the T 10 gets a better signal report of about
> 5-10 db on the other end. Due to this typical advantage as outlined
> here, many of the local DXers are picking up T 10's. SWR with the
> antenna at the 65 foot level appears to be almost flat across most of
> the bands, with the exception of 12 meters where it is about 1.4 to 1
> and parts of 10 meters rise to about 1.3 to 1 and remain flat across the
> balance of the range. 20 meters has a worst case SWR of 1.15 to 1 at
> the low end. 17 meters is 1:1 and 15 meters is 1:1.
> The antenna is a single feed line, trapless antenna with a reflector at
> the rear for 20 meters. This gives improved performance on 20m. Gain
> is about 6.5 dbd as per the ARRL antenna book, using the twin boom feed
> design, which it does. Front to back I find to be around 25-30 db
> depending on where the station is. Front to side about the max, since
> I can null out anyone completely.
> I did rebuild the antenna and redesign it structurally for out winter
> conditions here in Maine. I used Nylon gussets vs. the stock PVC and
> replaced much of the hardware with stainless bolts and stainless nyloc
> nuts vs. the self tapping screws used from the factory. I also used a
> piece of the Philistrand for a truss wire. So far, touch wood, it has
> stood up to several ice storms. I think this is the best bang for the
> buck in antennas out there, short of multiple antennas and towers.
> 73, Bruce K1XR
>
> --
> FAQ on WWW: http://www.contesting.com/towertalkfaq.html
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: owner-towertalk@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|