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Author Topic: Long wire with ATU as HF antenna  (Read 855 times)
ALPARD
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Posts: 105




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« Reply #15 on: September 15, 2019, 03:57:33 AM »

Great info and advice. Thank you all.
I will have a go at setting up a long wire with ATU for LF bands. Smiley

73s

Jay
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N1UR
Member

Posts: 301




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« Reply #16 on: September 15, 2019, 04:56:27 AM »

I strongly recommend the Zepp approach for this type of thing.  I have used it a number of times over the years. 

Open wire line to the outside "take off" point.  Then acting as a random wire. 

I had very good luck on 160M back in the day with the length of that wire being 3/8 wave on 160M.  I also used it on 80M.

Some kind of ground system is critical.

Ed  N1UR
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WA7ARK
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Posts: 738




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« Reply #17 on: September 15, 2019, 06:52:08 AM »

...Some kind of ground system is critical...
Yep!
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Mike, WA7ARK
WB6BYU
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Posts: 18516




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« Reply #18 on: September 15, 2019, 10:53:12 AM »

Quote from: N1UR

Some kind of ground system is critical.




Of course, the original Zepp had no ground connection, because such
things were problematic on airships (particularly those using hydrogen gas,
as a major design criterion was to keep the antenna away from the gas bag).

I've had reasonably good results using a Zepp feed with a half wave wire for
80m, as it also presents a high impedance on most HF bands.  But I wouldn't
recommend it for random length wires - it is just as prone to common mode
current as any other feedline.
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ALPARD
Member

Posts: 105




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« Reply #19 on: September 17, 2019, 10:29:24 AM »

Would the length of the long wire make difference in efficiency and resonating for the bands?

Or it should be purely treated as random wire length, and the business happens in the antenna tuner in this configuration?
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KH6AQ
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Posts: 7972




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« Reply #20 on: September 17, 2019, 10:56:47 AM »

I am new to using ladder line so please excuse my ignorance <GRIN>
I am considering installing a doublet antenna, my plan is the run 450 ohm ladder line from the antenna down a metal mast, across the asphalt shingle roof, down the side of the stucco building through the wall to the back of my MFJ 989D antenna tuner.
Do we see any problems with this installation??

Thanks
George KJ6TSX

I had a similar installation and it worked well. Comments on your installation:

1) Ladder line running down the metal mast: Space the ladder line a few inches away from the mast. This can be provided by attaching the ladder line a few feet from the bottom of the mast. Or, spacers on the mast can be used. The Wireman stocks two ladder line spacers, part numbers 811A-CQ and 811C-CQ.

                https://thewireman.com/product-category/antenna-materials/insulators/

2) Ladder line across the shingle roof: When wet the impedance will change and loss will increase. This may show up as a change in tuner settings when wet. It worked for me.

3) Ladder line down the side of a stucco building: Space the ladder line a few inches from the building. The spacing can be provided by routing the ladder one over the eaves and down to an attachment point (the hole in the wall).

4) Ladder line thru the wall. The antenna tuner will take care of any impedance discontinuity. If you'd like a second layer of insulation route the ladder line thru a length of PVC pipe.

The Wireman stocks everything for ladder line antennas. Antenna wire, rope, five types of ladder line, a ladder line center insulator, splices and a ladder line lightning arrestor.
« Last Edit: September 17, 2019, 11:15:00 AM by KH6AQ » Logged
ALPARD
Member

Posts: 105




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« Reply #21 on: September 18, 2019, 03:47:37 AM »

Would random length wire and atu and earth wire type of setup benefit from installing with balun?

Why? Or why not?
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