Try it. Make an antenna. See if it works. See if it works when it’s very wet. See if it stays together when the wind is howling. See if takes the physical strain. See if you can rig it with gloves when it’s very cold.
If it does all of those without constant need of repair you have a solution. If not change the failing part and try again. Lather, rinse, repeat.
From the other thread I think Steve is talking about using nylon cord rather than string. I agree with you that if he was using string and it got wet, it could be a problem. The Nylon cord would be the strain relief for the links. There would still of course need to be some kind of connectors for the links themselves (my favourite are 2mm RC power connectors, they have a nice “click” while being small and lightweight).
The feed point could also use nylon cord I exepect however the use of a piece of connector block shown in the other thread, looks like a great idea. The feed point would need some way to be fastened to watever is supporting the centre of the Inverted-V. Just an extra loop of cord perhaps.
Steve are you using a fishing pole for the centre support of simply finding a suitable tree branch?
In any case the use of nylon cord as the strain releif for the links and possibly the feed point sounds like a good idea - I look forward to hearing how it goes Steve.
String not good becomes damp very quickly and will short out.
Fishing wire nylon with good LB-age breaking strain should good as would have thought.
Can see where your coming from in trying to make the antenna simple as possible and lighter.
At moment am making portable antenna with a view of one minute its a vertical and then can quickly change it to a 40mb 1/2w end fed long wire that will run up the 8M Fibre glass pole and away at angle in one direction. and a equal length in counter poise via the Home brew 9:1 Unun for both antennas. Cause some times there won’t be room for said long wire and will have to resort to the vertical only. Be interesting see how this little fella works. But like the man says keep the end off the ground at least by what I reckon of 5 five or more
But presumably not near the metal of the poles as there is a voltage peak at the end of the dipole yes?
I plan to use more nylon cord the extend the dipole for pegging out.
Yes indeed, I should have said nylon cord, thanks.
I plan to use a fishing pole (probably a sotabeam pole- I suddenly remembered the other day I actually have a fishing pole from my angling days, so excitedly went and (ahem) fished it out of the bag but it’s not much longer than a fishing rod, so too short)
Centre point wise I was thinking of a plastic (derivative) flat plate, but not like my prototype in the link, which was a bit fragile when drilling.(I’ll add photos actually to the original thread for completeness after posting this)
Yes my bad re string, I really mean the fairly slippy feel nylon cord.
Fishing line (I would favour braided) could be good for utra lightweight, though joining the two wouldn’t be as easy as the double fisherman’s knot would probably not work.
I have here spider fishing wire 100Lb breaking strain .55mm and its braided got off internet its PE braided line fishing wire check your local fishing tackle shop they may have something similar. On end of my G5RV portable antenna for the car i use nylon rope as support wire ended off n a bungy rope to stretch it a little and keep the tension before it his the support pole
[quote=“MM0FMF, post:10, topic:11149”]
I seem to remember from school physics that the breakdown voltage for air is 25kV / inch. How high is the voltage on a half wave dipole with 5W of drive? So yes, right at the end.[/quote]
Though I might contest that in the Blackies when I go up there is usually enough cloud conductivity in the air to break down much lower. But point well made and taken!
PS End termination: Tie wraps - soffit lozenge - shrink sleeving. Cord can be bought from most local hardware shops and flame fused to prevent fraying. Wire has quite thick insulation but is more flexible than most - 0.1/55 as used on instrument leads.
Ah brilliant Phil thanks.
I had seen someone (maybe even you) using phonos the other day but it had gone from the memory FAT. They are pretty good connectors. Used to draw about 20amps through some of those back in the day The cord you are using there is identical to what I plan to use.
That thumb looks painful too!
EUR2,11 for 10 pairs - the ones Andy pointed to appear to be the same but with heatshrink. These are from the Hobby King UK Warehouse.