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Old November 24th 08, 07:32 AM posted to rec.radio.amateur.antenna
John Smith John Smith is offline
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First recorded activity by RadioBanter: Nov 2006
Posts: 2,915
Default A question about dummy load

ve2pid wrote:
Hi to all

In a document from Roy Lewallen, we read this:

When a balanced antenna is fed with coaxial cable (Fig.1),
the outside of the shield appears as an extra, separate
conductor connected to the right side of the antenna at the
feed point. (page 157. What They Do And How They Do lt)

My question is this: Can we say the same thing for a dummy load (i.e
can we replace the words 'balanced antenna' with 'dummy load'?) so the
dummy load would 'see' three conductors?

We are trying to explain why some dummy load/Tx line systems radiate.
Perhaps, tthe current outside the coax (common mode current) exits,
while being very small, so the radiation could come from a leaking
coax... ?

Thanks de Pierre VE2PID


To cut to the chase, and past the BS ... with the best affordable dummy
load and solid coax, I can still chat a block down the street, at least
(with decent power.)

Now, how this is occurring? Is it "leakage" from the xmitter onto the
ac lines? Coupling to metal objects in the shack? Etc.?

Gawd only knows ... nothing is perfect ... when you find an answer to
this mystery, please post back here; I am positive many more than me
have wondered the same as you ... :-)

Regards,
JS