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End fed questions

Mar 20th 2019, 13:21

tscott

Joined: Mar 5th 2012, 02:13
Total Topics: 0
Total Posts: 0
I have an end fed running along the top of a wood stockade fence. I can get it about 10 feet higher but it will be about 4 feet from a metal guard rail. Is that too close?
Mar 21st 2019, 14:35

W1VT

Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
The only way to find out is to give it a try. Sort of like choosing hot pepper sauce for food. One person's "too hot" is another's mild.

Typically you need a better antenna to do voice than
CW/data. WSJT and the digital mode FT8 are very popular for hams starting out on HF.

Zak Lau W1VT
ARRL Senior Lab Engineer
Jan 25th, 11:06

kw4jm

Joined: Apr 30th 2014, 03:38
Total Topics: 0
Total Posts: 0
End fed question: My 65' end fed with 64:1 transformer works great on 40-20-17-15. I experimented by adding a short coil at the transformer end to see if I could get it to dip at 60m. To my surprise the coil changes nothing in that range. It dips at 6.5 mHz no matter how much coil I add. Any ideas why this is? Thanks, Scott kw4jm
Jan 25th, 12:24

W1VT

Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Hi Scott,
You can't add a loading coil to either end of an fed antenna because both ends need to be high impedance for the transformer to work properly. Loading coils are typically placed where the impedance is low, not high.

Zak W1VT
ARRL Senior Lab Engineer
Jan 25th, 13:00

kw4jm

Joined: Apr 30th 2014, 03:38
Total Topics: 0
Total Posts: 0
Thank you Zak. That is so clear and informative, again I say thank you. Scott
Mar 5th, 13:46

KJ7WUZ

Joined: Mar 31st 2020, 15:11
Total Topics: 0
Total Posts: 0
I am purchasing a 5W QRP radio kit for 40m recently featured in the Feb 2022 QST review column. I am a newly licensed Tech that wants to learn and use CW for portable operation. Would an EFHW be the antenna for this?

Should I attempt a homebrew EFHW or just go with say, a Par EndFedz 40?

I fear the Par may not be long enough, designed for the 40m band and the CW segment I am allowed to operate in is the very lower end of the band. (i have used a Par EndFedz SWL to listen for years and love it).

Thank you, and 73
Dave KJ7WUZ

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