[BC] Assistance with a tall tower

donroden at hiwaay.net donroden at hiwaay.net
Thu Nov 18 19:02:58 CST 2010


Thanks All !!

I am familiar with standard 1/4 wave antennas at 25-32 ohms, so when I  
grabbed the meter shorting plug I heard a "psssssss" ........ Ohhhhh  
dats gonna hurt...

finger tip a little too close to the brass  ( and that was at 100 watts )
LOL !!!! That high impedance reaches out.

Don R

Quoting harold stanton <k5gvr at hotmail.com>:

> Don,
>  What Richard said. That's what I guesstimated as well.
>  It is not unusual to make a "two-step" impedance transformation with
> that large of a difference in points.
>  Why you usually find a PI-L in a tube type xmtr.
>  Now what we don't know, is the median impedance chosen by
> the creator. Geometric mean or just a convenient impedance choice.
>  Measurements will most likely be required, if you don't figure out
> just what's breaking down. (Arc across inside of feed bowl maybe?)
>
>     Harold
>
>



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