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Author Topic: Low budget multiband vert  (Read 2120 times)
NI3S
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Posts: 67




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« on: March 31, 2013, 08:42:18 PM »

Back story: A local Ham is having antenna issues.  He lives on a very small lot, lives on a very limited budget, and not in the best neighborhood.  In the past a home brewed dipole attached to his fence worked well on 40m-10m, until the hoodlums cut the guys.  Replacing them is getting old.  Limited tree heights are an issue too but they are high enough that a wire 20m vert is keeping things going, but only on 20m for the most part.

The good news is just before retirement the one car garage roof was redone in metal.  It is block construction so the idea is a vertical attached to it might get him on 40-30-20?.  Research has shown some DIY aluminum pipe verts can tune pretty well but a specific design has not been nailed down.   Mounting the antenna in the middle of the roof may prove a challenge, so that is a factor too.  Mounting on the side of the building will be simple.  

I've built many an antenna.  With access to a tool and die shop and the people capable of that kind of work it seems there must be a design that will help this Ham to get back to his 'net chats and OM stuff.  Please help us help this long time friend of the radio stay on the air.  Any design Ideas to meet this criteria?
« Last Edit: March 31, 2013, 08:44:35 PM by NI3S » Logged
KQ6Q
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Posts: 993




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« Reply #1 on: March 31, 2013, 08:57:13 PM »

Anything vertical will probably work - the vandalism on the dipole setup was probably revenge for unreported RFI - with power lines likely going overhead along the back of the lot, his RF was likely getting into neighborhood entertainment electronics. Vertical radiator will minimize the coupling. Work out something for 40m to give him a night-time band. a mobile whip concealed in PVC pipe, and fed with the garage roof as a ground plane could work - it's be directional toward the roof, but he'd make contacts.
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W1VT
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« Reply #2 on: April 01, 2013, 03:59:13 AM »

How about a wire inverted L for 40M supported the trees?  

I'd find out what works for 40, then figure out the multibanding part.

Zack W1VT
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VE3FMC
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« Reply #3 on: April 01, 2013, 04:26:58 AM »

How about making the tie offs for the dipole out of wire? Use rope for the first few feet off the dipole then wire the rest of the way. At least that way the punks can not cut it with a knife.
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W1JKA
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« Reply #4 on: April 01, 2013, 05:53:21 AM »

    If  there is a tree available on each side or end of the garage a sky wire/rope between  them going over the roof with a small pulley centered over the side of the garage would support the 90* angle at the top of the vertical section of a 40m inverted L suggested by W1VT.
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W5WSS
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« Reply #5 on: April 01, 2013, 08:43:41 AM »

A Hustler Btv vertical system is a good target to save up the coin for.
Placement of The trap vertical will offer a viable solution when properly installed on your roof top.
The system can work reasonably well pushing against a flat plane Aluminum roof.
The antenna system performance IE ERP, will probably most benefit from a central location upon the metal roof and
for best Omni directional pattern development.
On the other hand malicious vandalism is an age old problem too bad the fellow is experiencing the hoodlums.
Consider the metallic roof structure a valid solution for an elevated trap vertical.
Look for a place to attach the shielding of the feed line to the roof as close to the center conductor attachment at the antenna base as possible. Use good corrosion resistant hardware. Similar metals are best. For a weather proof connection use a non acidic corrosive sealant designed for antenna feed line contact to the metals being joined.
73
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NO2A
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« Reply #6 on: April 01, 2013, 09:59:10 AM »

I`d try real light gauge wire,then run that to fishing line to the fence. Hopefully they will never see it.
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VE3FMC
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« Reply #7 on: April 01, 2013, 11:26:52 AM »

I`d try real light gauge wire,then run that to fishing line to the fence. Hopefully they will never see it.

Or put up a sign that states

HIGH VOLTAGE
Grin
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