[bars] EFHW question

[Tim KC1RET]

So I've been wrestling with a new EFHW antenna here and I have some 
questions/challenges/learning opportunities.

I'm basing the build on the design described here: 
https://batteryeliminatorstore.com/blogs/ocf-masters-articles/a-deep-dive-into-end-fed-half-wave-antennas 
.  After reviewing it again I can see that I need to do some work on my 
36:1 balun; my primary windings are too far apart.  With some trimming 
(folding back) I can get a decent match on 80 & 40 and sometimes 10, but 
the rest are > 2.5:1 SWR.  I've tried both wire and coax counterpoise - 
the results are basically the same.

Beyond that, I've observed that the noise level on the EFHW (I've tired 
both the 80 & 40m multiband versions) is far higher (4-6 S units higher 
) than on my 40+20m fan dipole.  Overall received signal strength is 
approx. the same although with the higher noise level the copy is much 
easier on the dipole; weaker signals just disappear into the noise on 
the EF where they are quite copyable on the dipole.  The EF is at about 
20ft AGL and the dipole at about 10ft.  My expectation was that the EF, 
being longer and higher, would have better S/N but I am experiencing the 
exact opposite.  Both are fed with LMR400; the dipole with 50ft, the EF 
with 75ft.

So my questions are basically these:

- Do EFHW antennas have greater noise sensitivity compared to a 
dipole?    I don't really think this is the case, but it's a place to 
start to determine cause.

- When using a coax counterpoise, should the non-driven side 
(counterpoise) of the secondary be shorted to the ground of the coax 
(shield side of the primary)?  I think yes, but I'd like to confirm 
that.  Also, that when using a wire counterpoise it should NOT be 
shorted to the coax shield, correct?

Thanks & 73,

Tim - KC1RET
-- 

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      Tim Carter - KC1RET

			

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	kc1ret.radio at gmail.com

	https://kc1ret.com

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