RadioDXfun
Omni low angle radiator
Like most people who use a long wire/EFHW my antennas have a a strain relief on the transformer plastic box. I started to wonder
how this might affect the antenna. A looped piece of wire with insulation looks a lot like a capacitor to me.
So I have removed the strain relief which I do not need really and instead Gorilla glued the wire to the box itself rather than have that loop
of wire. I suspect that the higher in frequency the greater the effects of that loop on the antenna tuning. (as that loop becomes a greater proportion of the radiating element) On an EFHW (at actual half wave freq of the wire) there are high voltages at the ends of the antenna. As such I thought it was an odd place to have what is in effect a capacitor or some kind of extra LC circuit (a loop and a capacitive effect).
So I expect my VSWR to change a little but I do wonder if this will have an effect on pattern or match.
I cannot quite work out what effects it might have or not have so any input appreciated.
Anyway I have always looked at this arrangement and though that does not look great to me. (Albeit great for strain relief)
This is a random internet find, nearly all of these antenna types that hams DIY use it, myself included
until now that is. I also wonder if doing away with the strain relief would potential help any SWR issues for multi band users.
I only use mono band cut ones myself so a non issue for me personally.
how this might affect the antenna. A looped piece of wire with insulation looks a lot like a capacitor to me.
So I have removed the strain relief which I do not need really and instead Gorilla glued the wire to the box itself rather than have that loop
of wire. I suspect that the higher in frequency the greater the effects of that loop on the antenna tuning. (as that loop becomes a greater proportion of the radiating element) On an EFHW (at actual half wave freq of the wire) there are high voltages at the ends of the antenna. As such I thought it was an odd place to have what is in effect a capacitor or some kind of extra LC circuit (a loop and a capacitive effect).
So I expect my VSWR to change a little but I do wonder if this will have an effect on pattern or match.
I cannot quite work out what effects it might have or not have so any input appreciated.
Anyway I have always looked at this arrangement and though that does not look great to me. (Albeit great for strain relief)
This is a random internet find, nearly all of these antenna types that hams DIY use it, myself included
until now that is. I also wonder if doing away with the strain relief would potential help any SWR issues for multi band users.
I only use mono band cut ones myself so a non issue for me personally.
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