Who is helping Hams?

[W8JITom at aol.com]

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 at dumpty.nal.go.jp (Takao KUMAGAI)  Fri Aug 16 09:14:03 1996
From: je1cka at dumpty.nal.go.jp (Takao KUMAGAI) (Takao KUMAGAI)
Date: Fri, 16 Aug 1996 17:14:03 +0900
Subject: [cq-contest 17931] CQ Umfair to CW Ops \\ SOA Power Levels
Message-ID: <199608160814.RAA20277 at 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 at rrze.uni-erlangen.de (Werner Maier)  Fri Aug 16 13:02:14 1996
From: Werner.Maier at rrze.uni-erlangen.de (Werner Maier) (Werner Maier)
Date: Fri, 16 Aug 1996 12:02:14 MET
Subject: KT-34A VSWR problems
Message-ID: <45CDBF0CAE at 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.



    
    

-------------------------------------------------------------------
 Email:  werner.maier at rrze.uni-erlangen.de  werner.maier at muekno.de
 Amateur Packet Radio:  dl4ner at db0box.#bay.deu.eu
 Novell-Betreuung am Regionalen Rechenzentrum Erlangen  
-------------------------------------------------------------------