TIP: Click on subject to list as thread! ANSI
echo: ham_tech
to: WAYNE SAROSI
from: RAY WADE
date: 1997-02-24 13:51:00
subject: LPDA Plans

On (23 Feb 97) Wayne Sarosi wrote to Ray Wade...
 WS> In a message to Wayne Sarosi  Ray Wade wrote:
 RW> Thank you! BTW, have you ever "modeled" your LPDA using one of those
 RW> software programs for that purpose? I am curious to know what would
 RW> happen to the gain and SWR curves if the beam was "fed" from the
 RW> opposite end *or* at one of the middle elements? I don't have such a
 RW> program myself.
 WS> No, I haven't. I just use my noodle and a calculator. The LPDA will
 WS> not work being fed from the larger elements nor in the middle.
The reason I asked about a different feedpoint is because my KLM
KT43-XA has a log periodic feed. Unlike a regular log periodic, only two
of the elements are fed, and I was thinking it was the rearmost of the
two that has the matching network and balun (4 KW PEP) and the next one
forward is cross fed (just like all the elements of your LPDA). This
makes the KT-34XA very broad. AAMOF it will cover *all* of 20 and 15
plus about 1.2 Mhz of the 10 meter band with less than 2:1 SWR.
 WS> Neat deal. I'm still running my Ten-Tec Closet kW since 1990. And the
 WS> Kenwood TS430S is still in service from 1987.
I have the Alpha 77DX. Got it at the same time I bought the Collins.
And, you may recall, an IC-735 with a trunk mounted tuner in the car.
I have a couple of friends that have your rig. They all like it. One
friend in Dallas bought his Collins 380 when I did. He works for
Rockwell (still) and got the same deal I did. He recently sold his 380
to a Jap buyer for $2500 (he didn't have *all* the options like I do).
After evaluating several of the latest, including your rig, he finally
wound up with the latest Yeasu, the one that goes for about 4 grand. He
had the Ten Tec for a couple of months and sent it back on their
try-it-free-money-back-if-not-satisfied-deal. All he had to pay was
shipping. I don't recall exactly what fault he found with it, but I do
remember it was a very minor thing. He is *very* picky. He is a
*contester*, one of those honor roll guys (he has 328 countries on
phone and over 340 on CW) and it had something to do with contesting
that he didn't like. *I* hate contesting. Couldn't care less.
... He who dies with the most toys is dead.
--- PPoint 2.00
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* Origin: K5JCM, Tulsa OK (1:170/302.4)

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