Does anyone know who is representing amateur in the area of RF exposure (I'm
well aware of N6NB). I would like to put them in contact with some private
researchers in the field. E-mail direct.
73 Tom
>From je1cka@dumpty.nal.go.jp (Takao KUMAGAI) Fri Aug 16 09:14:03 1996
From: je1cka@dumpty.nal.go.jp (Takao KUMAGAI) (Takao KUMAGAI)
Subject: [cq-contest 17931] CQ Umfair to CW Ops \\ SOA Power Levels
Message-ID: <199608160814.RAA20277@dumpty.nal.go.jp>
In message "[cq-contest 17931] CQ Umfair to CW Ops \\ SOA Power Levels"
on 96/08/15, Robert Wanderer writes:
: Why is there only one power class for SOA?
I know there are 3 power classes for Sop AllBands.
High Power, Low Power and QRP classes.
Where did that one power class come from?
Tack JE1CKA
>From Werner.Maier@rrze.uni-erlangen.de (Werner Maier) Fri Aug 16 13:02:14 1996
From: Werner.Maier@rrze.uni-erlangen.de (Werner Maier) (Werner Maier)
Subject: KT-34A VSWR problems
Message-ID: <45CDBF0CAE@isis.rrze.uni-erlangen.de>
Hi there.
Thanks in advance for reading and probably replying.
I recently bought an used KT34A that has been up for last summer.
I just build it up again (I had only to mount the elements to the
boom, the elements have been mounted before).
It now is about 4 meters above roof, maybe 15..20 meters above ground
level. The roof is about 60 degrees, so the beam should have enough
"free air" aorund. There are no buildings high enough to
disturb nearer than 200m round our building.
Now let's go to the problem:
I measured the VSWR:
a) 10m: there are no problems at all, VSWR better 1:1.5 from 28.0 to
28.7 mc, above slightly increasing to about 1:2 @ 29.7 mc
b) 15m: there is a problem, I think: VSWR 1:2.0 @ 21 mc increasing to
1:3.0 @ 21.450 mc. I'm just wondering why the Beam shows a
VSWR below 1:1.5 @ 20.3 - 20.7 mc, that's what I would have
exspected maybe 500 kc above...
c) 20m: the symptom is similar to 15m: VSWR is somewhat higher than
expected and a VSWR similar to the diagram shown in the
mounting manual may be found about 500 kc below 14 mc.
The VSWRs move slightly according to the beam directing in an normal
range (i.e. +- 0.2); this should be normal according to the roof, I
think.
Now let's ask some questions:
1. Did anyone using the KT34A have the same problems, and how did he
solve it?
2. Does anyone have more precise manuals than the original
mounting manuals explaining how to tune the beam
(i.e. 100kc @ 21 mc = xxx inches)
3. Does anyone know email or web addresses of KLM ?
4. I have read an article concerning the KT34XA, written by DL1BU
for the German CQ-DL magazine, issue October 1980.
There he wrote something about problems he had with the capacitor
tubes because problems of KLM. After mounting the new parts
with blue caps, all problems were gone.
So what? I have blue capacitor caps.
Also, I've heard rumours about problems with some KT34As sold
last one or two years having the same problem with the capacitors.
In those rumours KLM is said to send FAXs with tuning instructions
while in the meantime already sending the right capacitors out,
i.e. while already knowing the problem.
If so, I would concider not spend hours and hours climbing on my
roof or mast, but I would better be waiting for spare parts.
Thank You all in advance for any useful comments.
best 73s de Werner DL4NER.
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Email: werner.maier@rrze.uni-erlangen.de werner.maier@muekno.de
Amateur Packet Radio: dl4ner@db0box.#bay.deu.eu
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